Description: Features represent railroad track sections. Field CLASS contains values Primary, Secondary, Crossover, IAAP and Centerline. DMCGIS is the origin of these classes. "Primary" represents the main rail running east/west across The County as well as the main spurs running north/south from the downtown rail yard. "Secondary" are feeders into the primaries. "Crossover" are short, track changers. "IAAP" has been assigned to all tracks with ingress/egress to the plant grounds as well as all those on the plant grounds. "Centerline" is a single feature which can be used as an alternative to represent the double main tracks running across The County at smaller scales.
Description: Features represent railroad track sections. Field CLASS contains values Primary, Secondary, Crossover, IAAP and Centerline. DMCGIS is the origin of these classes. "Primary" represents the main rail running east/west across The County as well as the main spurs running north/south from the downtown rail yard. "Secondary" are feeders into the primaries. "Crossover" are short, track changers. "IAAP" has been assigned to all tracks with ingress/egress to the plant grounds as well as all those on the plant grounds. "Centerline" is a single feature which can be used as an alternative to represent the double main tracks running across The County at smaller scales.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This High Resolution Landcover product was derived from three dates of aerial imagery, and from elevation information derived from LiDAR elevation data. It has a spatial resolution of one meter, and a class resolution of 15 classes. The target year for the interpretation of the classification is 2009. The Imagery sources are the 2008 NAIP imagery, the 2009 NAIP imagery, and the Four band Spring imagery collected in 2007, 2009 and 2010. Three dates were used because previous experimentation had shown that using fewer dates lacked sufficient spectral information to produce a reasonably consistent classification at the level required. Because each of these imagery layers were collected at widely different dates, to produce consistent classifications required breaking the state into regions or "tiles" with consistent spectral character. More than 580 such tiles were utilized statewide. Each was independently processed, and separately interpreted and checked. The final products were mosaicked together, then broken out into county files, which is how the files are presented in the NRGIS Library. Although we have done the best job we could to maintain consistency between these many files, it is impossible to maintain absolute consistency in even a small set of files, let alone this large number. The LiDAR data utilized was created by subtracting the Bare Earth DEM from the First Return DEM, yielding a normalized elevation model, which represents the elevation above ground surface of buildings, trees and other vegetation. This layer made an important contribution to producing an accurate classification of buildings and forests. A series of post classification steps were performed to correct problems which were consistent enough to be remedied by this kind of solution. These included embedding rasterized roads, recoding certain shadows, and using the LiDAR to refine building footprints, among others. See processing steps for more information.
Copyright Text: R. Peter Kollasch developed this coverage for the DNR, with assistance from Kathryne Clark, Matt Gosse, Thejashwini Ramarao, Matt Swanson, and Sara Porter.
Description: This dataset represents conservation and recreation lands in the state of Iowa. Boundaries of areas represent differences in ownership and managing agency of the area. The sources of this data is derived from many different sources, mainly from the agency responsible for the area. Signage, fences and private property should be respected as the on-the-ground boundary.
Copyright Text: Casey J Kohrt developed this coverage for the DNR.
Description: Features represent railroad track sections. Field CLASS contains values Primary, Secondary, Crossover, IAAP and Centerline. DMCGIS is the origin of these classes. "Primary" represents the main rail running east/west across The County as well as the main spurs running north/south from the downtown rail yard. "Secondary" are feeders into the primaries. "Crossover" are short, track changers. "IAAP" has been assigned to all tracks with ingress/egress to the plant grounds as well as all those on the plant grounds. "Centerline" is a single feature which can be used as an alternative to represent the double main tracks running across The County at smaller scales.
Description: Features represent railroad track sections. Field CLASS contains values Primary, Secondary, Crossover, IAAP and Centerline. DMCGIS is the origin of these classes. "Primary" represents the main rail running east/west across The County as well as the main spurs running north/south from the downtown rail yard. "Secondary" are feeders into the primaries. "Crossover" are short, track changers. "IAAP" has been assigned to all tracks with ingress/egress to the plant grounds as well as all those on the plant grounds. "Centerline" is a single feature which can be used as an alternative to represent the double main tracks running across The County at smaller scales.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This High Resolution Landcover product was derived from three dates of aerial imagery, and from elevation information derived from LiDAR elevation data. It has a spatial resolution of one meter, and a class resolution of 15 classes. The target year for the interpretation of the classification is 2009. The Imagery sources are the 2008 NAIP imagery, the 2009 NAIP imagery, and the Four band Spring imagery collected in 2007, 2009 and 2010. Three dates were used because previous experimentation had shown that using fewer dates lacked sufficient spectral information to produce a reasonably consistent classification at the level required. Because each of these imagery layers were collected at widely different dates, to produce consistent classifications required breaking the state into regions or "tiles" with consistent spectral character. More than 580 such tiles were utilized statewide. Each was independently processed, and separately interpreted and checked. The final products were mosaicked together, then broken out into county files, which is how the files are presented in the NRGIS Library. Although we have done the best job we could to maintain consistency between these many files, it is impossible to maintain absolute consistency in even a small set of files, let alone this large number. The LiDAR data utilized was created by subtracting the Bare Earth DEM from the First Return DEM, yielding a normalized elevation model, which represents the elevation above ground surface of buildings, trees and other vegetation. This layer made an important contribution to producing an accurate classification of buildings and forests. A series of post classification steps were performed to correct problems which were consistent enough to be remedied by this kind of solution. These included embedding rasterized roads, recoding certain shadows, and using the LiDAR to refine building footprints, among others. See processing steps for more information.
Copyright Text: R. Peter Kollasch developed this coverage for the DNR, with assistance from Kathryne Clark, Matt Gosse, Thejashwini Ramarao, Matt Swanson, and Sara Porter.
Description: This dataset represents conservation and recreation lands in the state of Iowa. Boundaries of areas represent differences in ownership and managing agency of the area. The sources of this data is derived from many different sources, mainly from the agency responsible for the area. Signage, fences and private property should be respected as the on-the-ground boundary.
Copyright Text: Casey J Kohrt developed this coverage for the DNR.
Description: Features represent railroad track sections. Field CLASS contains values Primary, Secondary, Crossover, IAAP and Centerline. DMCGIS is the origin of these classes. "Primary" represents the main rail running east/west across The County as well as the main spurs running north/south from the downtown rail yard. "Secondary" are feeders into the primaries. "Crossover" are short, track changers. "IAAP" has been assigned to all tracks with ingress/egress to the plant grounds as well as all those on the plant grounds. "Centerline" is a single feature which can be used as an alternative to represent the double main tracks running across The County at smaller scales.
Description: Features represent railroad track sections. Field CLASS contains values Primary, Secondary, Crossover, IAAP and Centerline. DMCGIS is the origin of these classes. "Primary" represents the main rail running east/west across The County as well as the main spurs running north/south from the downtown rail yard. "Secondary" are feeders into the primaries. "Crossover" are short, track changers. "IAAP" has been assigned to all tracks with ingress/egress to the plant grounds as well as all those on the plant grounds. "Centerline" is a single feature which can be used as an alternative to represent the double main tracks running across The County at smaller scales.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This High Resolution Landcover product was derived from three dates of aerial imagery, and from elevation information derived from LiDAR elevation data. It has a spatial resolution of one meter, and a class resolution of 15 classes. The target year for the interpretation of the classification is 2009. The Imagery sources are the 2008 NAIP imagery, the 2009 NAIP imagery, and the Four band Spring imagery collected in 2007, 2009 and 2010. Three dates were used because previous experimentation had shown that using fewer dates lacked sufficient spectral information to produce a reasonably consistent classification at the level required. Because each of these imagery layers were collected at widely different dates, to produce consistent classifications required breaking the state into regions or "tiles" with consistent spectral character. More than 580 such tiles were utilized statewide. Each was independently processed, and separately interpreted and checked. The final products were mosaicked together, then broken out into county files, which is how the files are presented in the NRGIS Library. Although we have done the best job we could to maintain consistency between these many files, it is impossible to maintain absolute consistency in even a small set of files, let alone this large number. The LiDAR data utilized was created by subtracting the Bare Earth DEM from the First Return DEM, yielding a normalized elevation model, which represents the elevation above ground surface of buildings, trees and other vegetation. This layer made an important contribution to producing an accurate classification of buildings and forests. A series of post classification steps were performed to correct problems which were consistent enough to be remedied by this kind of solution. These included embedding rasterized roads, recoding certain shadows, and using the LiDAR to refine building footprints, among others. See processing steps for more information.
Copyright Text: R. Peter Kollasch developed this coverage for the DNR, with assistance from Kathryne Clark, Matt Gosse, Thejashwini Ramarao, Matt Swanson, and Sara Porter.
Description: This dataset represents conservation and recreation lands in the state of Iowa. Boundaries of areas represent differences in ownership and managing agency of the area. The sources of this data is derived from many different sources, mainly from the agency responsible for the area. Signage, fences and private property should be respected as the on-the-ground boundary.
Copyright Text: Casey J Kohrt developed this coverage for the DNR.
Description: Features represent railroad track sections. Field CLASS contains values Primary, Secondary, Crossover, IAAP and Centerline. DMCGIS is the origin of these classes. "Primary" represents the main rail running east/west across The County as well as the main spurs running north/south from the downtown rail yard. "Secondary" are feeders into the primaries. "Crossover" are short, track changers. "IAAP" has been assigned to all tracks with ingress/egress to the plant grounds as well as all those on the plant grounds. "Centerline" is a single feature which can be used as an alternative to represent the double main tracks running across The County at smaller scales.
Description: Features represent railroad track sections. Field CLASS contains values Primary, Secondary, Crossover, IAAP and Centerline. DMCGIS is the origin of these classes. "Primary" represents the main rail running east/west across The County as well as the main spurs running north/south from the downtown rail yard. "Secondary" are feeders into the primaries. "Crossover" are short, track changers. "IAAP" has been assigned to all tracks with ingress/egress to the plant grounds as well as all those on the plant grounds. "Centerline" is a single feature which can be used as an alternative to represent the double main tracks running across The County at smaller scales.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This High Resolution Landcover product was derived from three dates of aerial imagery, and from elevation information derived from LiDAR elevation data. It has a spatial resolution of one meter, and a class resolution of 15 classes. The target year for the interpretation of the classification is 2009. The Imagery sources are the 2008 NAIP imagery, the 2009 NAIP imagery, and the Four band Spring imagery collected in 2007, 2009 and 2010. Three dates were used because previous experimentation had shown that using fewer dates lacked sufficient spectral information to produce a reasonably consistent classification at the level required. Because each of these imagery layers were collected at widely different dates, to produce consistent classifications required breaking the state into regions or "tiles" with consistent spectral character. More than 580 such tiles were utilized statewide. Each was independently processed, and separately interpreted and checked. The final products were mosaicked together, then broken out into county files, which is how the files are presented in the NRGIS Library. Although we have done the best job we could to maintain consistency between these many files, it is impossible to maintain absolute consistency in even a small set of files, let alone this large number. The LiDAR data utilized was created by subtracting the Bare Earth DEM from the First Return DEM, yielding a normalized elevation model, which represents the elevation above ground surface of buildings, trees and other vegetation. This layer made an important contribution to producing an accurate classification of buildings and forests. A series of post classification steps were performed to correct problems which were consistent enough to be remedied by this kind of solution. These included embedding rasterized roads, recoding certain shadows, and using the LiDAR to refine building footprints, among others. See processing steps for more information.
Copyright Text: R. Peter Kollasch developed this coverage for the DNR, with assistance from Kathryne Clark, Matt Gosse, Thejashwini Ramarao, Matt Swanson, and Sara Porter.
Description: This dataset represents conservation and recreation lands in the state of Iowa. Boundaries of areas represent differences in ownership and managing agency of the area. The sources of this data is derived from many different sources, mainly from the agency responsible for the area. Signage, fences and private property should be respected as the on-the-ground boundary.
Copyright Text: Casey J Kohrt developed this coverage for the DNR.
Description: Features represent railroad track sections. Field CLASS contains values Primary, Secondary, Crossover, IAAP and Centerline. DMCGIS is the origin of these classes. "Primary" represents the main rail running east/west across The County as well as the main spurs running north/south from the downtown rail yard. "Secondary" are feeders into the primaries. "Crossover" are short, track changers. "IAAP" has been assigned to all tracks with ingress/egress to the plant grounds as well as all those on the plant grounds. "Centerline" is a single feature which can be used as an alternative to represent the double main tracks running across The County at smaller scales.
Description: Features represent railroad track sections. Field CLASS contains values Primary, Secondary, Crossover, IAAP and Centerline. DMCGIS is the origin of these classes. "Primary" represents the main rail running east/west across The County as well as the main spurs running north/south from the downtown rail yard. "Secondary" are feeders into the primaries. "Crossover" are short, track changers. "IAAP" has been assigned to all tracks with ingress/egress to the plant grounds as well as all those on the plant grounds. "Centerline" is a single feature which can be used as an alternative to represent the double main tracks running across The County at smaller scales.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This High Resolution Landcover product was derived from three dates of aerial imagery, and from elevation information derived from LiDAR elevation data. It has a spatial resolution of one meter, and a class resolution of 15 classes. The target year for the interpretation of the classification is 2009. The Imagery sources are the 2008 NAIP imagery, the 2009 NAIP imagery, and the Four band Spring imagery collected in 2007, 2009 and 2010. Three dates were used because previous experimentation had shown that using fewer dates lacked sufficient spectral information to produce a reasonably consistent classification at the level required. Because each of these imagery layers were collected at widely different dates, to produce consistent classifications required breaking the state into regions or "tiles" with consistent spectral character. More than 580 such tiles were utilized statewide. Each was independently processed, and separately interpreted and checked. The final products were mosaicked together, then broken out into county files, which is how the files are presented in the NRGIS Library. Although we have done the best job we could to maintain consistency between these many files, it is impossible to maintain absolute consistency in even a small set of files, let alone this large number. The LiDAR data utilized was created by subtracting the Bare Earth DEM from the First Return DEM, yielding a normalized elevation model, which represents the elevation above ground surface of buildings, trees and other vegetation. This layer made an important contribution to producing an accurate classification of buildings and forests. A series of post classification steps were performed to correct problems which were consistent enough to be remedied by this kind of solution. These included embedding rasterized roads, recoding certain shadows, and using the LiDAR to refine building footprints, among others. See processing steps for more information.
Copyright Text: R. Peter Kollasch developed this coverage for the DNR, with assistance from Kathryne Clark, Matt Gosse, Thejashwini Ramarao, Matt Swanson, and Sara Porter.
Description: This dataset represents conservation and recreation lands in the state of Iowa. Boundaries of areas represent differences in ownership and managing agency of the area. The sources of this data is derived from many different sources, mainly from the agency responsible for the area. Signage, fences and private property should be respected as the on-the-ground boundary.
Copyright Text: Casey J Kohrt developed this coverage for the DNR.
Description: Features represent railroad track sections. Field CLASS contains values Primary, Secondary, Crossover, IAAP and Centerline. DMCGIS is the origin of these classes. "Primary" represents the main rail running east/west across The County as well as the main spurs running north/south from the downtown rail yard. "Secondary" are feeders into the primaries. "Crossover" are short, track changers. "IAAP" has been assigned to all tracks with ingress/egress to the plant grounds as well as all those on the plant grounds. "Centerline" is a single feature which can be used as an alternative to represent the double main tracks running across The County at smaller scales.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This High Resolution Landcover product was derived from three dates of aerial imagery, and from elevation information derived from LiDAR elevation data. It has a spatial resolution of one meter, and a class resolution of 15 classes. The target year for the interpretation of the classification is 2009. The Imagery sources are the 2008 NAIP imagery, the 2009 NAIP imagery, and the Four band Spring imagery collected in 2007, 2009 and 2010. Three dates were used because previous experimentation had shown that using fewer dates lacked sufficient spectral information to produce a reasonably consistent classification at the level required. Because each of these imagery layers were collected at widely different dates, to produce consistent classifications required breaking the state into regions or "tiles" with consistent spectral character. More than 580 such tiles were utilized statewide. Each was independently processed, and separately interpreted and checked. The final products were mosaicked together, then broken out into county files, which is how the files are presented in the NRGIS Library. Although we have done the best job we could to maintain consistency between these many files, it is impossible to maintain absolute consistency in even a small set of files, let alone this large number. The LiDAR data utilized was created by subtracting the Bare Earth DEM from the First Return DEM, yielding a normalized elevation model, which represents the elevation above ground surface of buildings, trees and other vegetation. This layer made an important contribution to producing an accurate classification of buildings and forests. A series of post classification steps were performed to correct problems which were consistent enough to be remedied by this kind of solution. These included embedding rasterized roads, recoding certain shadows, and using the LiDAR to refine building footprints, among others. See processing steps for more information.
Copyright Text: R. Peter Kollasch developed this coverage for the DNR, with assistance from Kathryne Clark, Matt Gosse, Thejashwini Ramarao, Matt Swanson, and Sara Porter.
Description: This dataset represents conservation and recreation lands in the state of Iowa. Boundaries of areas represent differences in ownership and managing agency of the area. The sources of this data is derived from many different sources, mainly from the agency responsible for the area. Signage, fences and private property should be respected as the on-the-ground boundary.
Copyright Text: Casey J Kohrt developed this coverage for the DNR.
Description: Features represent railroad track sections. Field CLASS contains values Primary, Secondary, Crossover, IAAP and Centerline. DMCGIS is the origin of these classes. "Primary" represents the main rail running east/west across The County as well as the main spurs running north/south from the downtown rail yard. "Secondary" are feeders into the primaries. "Crossover" are short, track changers. "IAAP" has been assigned to all tracks with ingress/egress to the plant grounds as well as all those on the plant grounds. "Centerline" is a single feature which can be used as an alternative to represent the double main tracks running across The County at smaller scales.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This High Resolution Landcover product was derived from three dates of aerial imagery, and from elevation information derived from LiDAR elevation data. It has a spatial resolution of one meter, and a class resolution of 15 classes. The target year for the interpretation of the classification is 2009. The Imagery sources are the 2008 NAIP imagery, the 2009 NAIP imagery, and the Four band Spring imagery collected in 2007, 2009 and 2010. Three dates were used because previous experimentation had shown that using fewer dates lacked sufficient spectral information to produce a reasonably consistent classification at the level required. Because each of these imagery layers were collected at widely different dates, to produce consistent classifications required breaking the state into regions or "tiles" with consistent spectral character. More than 580 such tiles were utilized statewide. Each was independently processed, and separately interpreted and checked. The final products were mosaicked together, then broken out into county files, which is how the files are presented in the NRGIS Library. Although we have done the best job we could to maintain consistency between these many files, it is impossible to maintain absolute consistency in even a small set of files, let alone this large number. The LiDAR data utilized was created by subtracting the Bare Earth DEM from the First Return DEM, yielding a normalized elevation model, which represents the elevation above ground surface of buildings, trees and other vegetation. This layer made an important contribution to producing an accurate classification of buildings and forests. A series of post classification steps were performed to correct problems which were consistent enough to be remedied by this kind of solution. These included embedding rasterized roads, recoding certain shadows, and using the LiDAR to refine building footprints, among others. See processing steps for more information.
Copyright Text: R. Peter Kollasch developed this coverage for the DNR, with assistance from Kathryne Clark, Matt Gosse, Thejashwini Ramarao, Matt Swanson, and Sara Porter.
Description: This dataset represents conservation and recreation lands in the state of Iowa. Boundaries of areas represent differences in ownership and managing agency of the area. The sources of this data is derived from many different sources, mainly from the agency responsible for the area. Signage, fences and private property should be respected as the on-the-ground boundary.
Copyright Text: Casey J Kohrt developed this coverage for the DNR.
Description: Features represent railroad track sections. Field CLASS contains values Primary, Secondary, Crossover, IAAP and Centerline. DMCGIS is the origin of these classes. "Primary" represents the main rail running east/west across The County as well as the main spurs running north/south from the downtown rail yard. "Secondary" are feeders into the primaries. "Crossover" are short, track changers. "IAAP" has been assigned to all tracks with ingress/egress to the plant grounds as well as all those on the plant grounds. "Centerline" is a single feature which can be used as an alternative to represent the double main tracks running across The County at smaller scales.
Description: This coverage contains arcs representing the river system and water bodies for DESMOINE County. This coverage was developed from the USEPA's REACH FILE 3 data system. Graphic elements for this coverage are from 1:100,000 scale digital line graphs (DLG) files from the USGS. Attribute data for each arc were added by USEPA contractors. Rivers were originally subdivided by river basin, but currently are merged and clipped by county. The RF3 data files were an interim version with many errors and incomplete attributes and documentation. A new version of this file from the improved RF3 data will be eventually produced.
Description: This High Resolution Landcover product was derived from three dates of aerial imagery, and from elevation information derived from LiDAR elevation data. It has a spatial resolution of one meter, and a class resolution of 15 classes. The target year for the interpretation of the classification is 2009. The Imagery sources are the 2008 NAIP imagery, the 2009 NAIP imagery, and the Four band Spring imagery collected in 2007, 2009 and 2010. Three dates were used because previous experimentation had shown that using fewer dates lacked sufficient spectral information to produce a reasonably consistent classification at the level required. Because each of these imagery layers were collected at widely different dates, to produce consistent classifications required breaking the state into regions or "tiles" with consistent spectral character. More than 580 such tiles were utilized statewide. Each was independently processed, and separately interpreted and checked. The final products were mosaicked together, then broken out into county files, which is how the files are presented in the NRGIS Library. Although we have done the best job we could to maintain consistency between these many files, it is impossible to maintain absolute consistency in even a small set of files, let alone this large number. The LiDAR data utilized was created by subtracting the Bare Earth DEM from the First Return DEM, yielding a normalized elevation model, which represents the elevation above ground surface of buildings, trees and other vegetation. This layer made an important contribution to producing an accurate classification of buildings and forests. A series of post classification steps were performed to correct problems which were consistent enough to be remedied by this kind of solution. These included embedding rasterized roads, recoding certain shadows, and using the LiDAR to refine building footprints, among others. See processing steps for more information.
Copyright Text: R. Peter Kollasch developed this coverage for the DNR, with assistance from Kathryne Clark, Matt Gosse, Thejashwini Ramarao, Matt Swanson, and Sara Porter.
Description: This dataset represents conservation and recreation lands in the state of Iowa. Boundaries of areas represent differences in ownership and managing agency of the area. The sources of this data is derived from many different sources, mainly from the agency responsible for the area. Signage, fences and private property should be respected as the on-the-ground boundary.
Copyright Text: Casey J Kohrt developed this coverage for the DNR.