Michigan 1992 NLCD GRID file by County

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Originator: Michigan Center for Geographic Information
Publication_Date: 20021101
Title: Michigan 1992 NLCD GRID file by County
Edition: None
Geospatial_Data_Presentation_Form: Raster digital data
Publication_Place: Lansing, MI
Publisher: Michigan Center for Geographic Information (MCGI)
This data set was created from the United States Geological Survey (USGS) National Land Cover Data (NLCD). The NLCD data was imported into ArcInfo software. ArcInfo was used to create a Grid for each Michigan county. Each county grid was then exported into the ArcInfo interchange file format .E00. Each county Grid represents the NLCD data as created by the USGS in 1992. The Grids have been reprojected to the Michigan Georef format. The NLCD data has not been modified or updated by the Michigan Center for Geographic Information.

Since this data set is basically repackaged NLCD data it is appropriate to refer to the metadata created by the USGS. We have included the file NLCDmeta.txt which contains this metadata as created by the USGS for Michigan based NLCD data.

Providing the NLCD data reprojected to Michigan Georef allows quick and easy incorporation of the data with the Michigan Geographic Framework geography. Providing the NLCD data at the county level allows easy access to the portion of the state that the user is interested in with out the burden of creating an extract from a statewide file.
This data set is maintained in the Michigan Georef projection system which is a form of an Oblique Mercator projection. There are 83 counties in Michigan and a 1992 NLCD Grid is available for each county. The data is provided as an ESRI ArcInfo Grid.
Beginning_Date: 1992
Ending_Date: 1992
The grids are created based on NLCD data compiled from Landsat satellite TM imagery (circa 1992). Any use of these grids should be conducted with the knowledge that the core data was created in 1992 and has not been updated in any way.
Progress: Complete
Maintenance_and_Update_Frequency: None planned
West_Bounding_Coordinate: -90.42458329182
East_Bounding_Coordinate: -82.41426851042
North_Bounding_Coordinate: 48.26268423771
South_Bounding_Coordinate: 41.69602725395
Theme_Keyword_Thesaurus: None
Theme_Keyword: NLCD
Theme_Keyword: Land Cover
Theme_Keyword: Land Use/Land Cover
Theme_Keyword: Land Management
Theme_Keyword: Land Resources
Theme_Keyword: EDC
Theme_Keyword: EPA
Theme_Keyword: EROS
Theme_Keyword: Imagery
Theme_Keyword: Land Characterization
Theme_Keyword: Landsat
Theme_Keyword: Landsat
Theme_Keyword: MRLC
Theme_Keyword: Remote Sensing
Theme_Keyword: Satellite
Theme_Keyword: Space Imaging
Theme_Keyword: USGS
Place_Keyword_Thesaurus: None
Place_Keyword: County
Place_Keyword: Michigan
Access_Constraints: None
Use_Constraints: None
Browse_Graphic_File_Description: GRID for Alcona County
Browse_Graphic_File_Type: GIF - Graphic Interchange Format

Map_Projection_Name: Oblique Mercator
Scale_Factor_at_Center_Line: .9996
Azimuthal_Angle: 337.255555555556
Azimuth_Measure_Point_Longitude: -86 00 00
Latitude_of_Projection_Origin: 45 18 43
False_Easting: 2546731.496
False_Northing: -4354009.816
Planar_Coordinate_Encoding_Method: Coordinate Pair
Abscissa_Resolution: .0001
Ordinate_Resolution: .0001
Planar_Distance_Units: Meters
Horizontal_Datum_Name: North American Datum 1983 (NAD83)
Ellipsoid_Name: Geodetic Reference System 80 (GRS80)
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257

NOTE - All classes may NOT be represented in a specific state data set. The class number represents the digital value of the class in the data set.

11. Open Water
12. Perennial Ice/Snow

21. Low Intensity Residential
22. High Intensity Residential
23. Commercial/Industrial/Transportation

31. Bare Rock/Sand/Clay
32. Quarries/Strip Mines/Gravel Pits
33. Transitional

Vegetated; Natural Forested Upland
41. Deciduous Forest
42. Evergreen Forest
43. Mixed Forest

51. Shrubland

Non-natural Woody
61. Orchards/Vineyards/Other

Herbaceous Upland
71. Grasslands/Herbaceous

Herbaceous Planted/Cultivated
81. Pasture/Hay
82. Row Crops
83. Small Grains
84. Fallow
85. Urban/Recreational Grasses

91. Woody Wetlands
92. Emergent Herbaceous Wetlands

NLCD Land Cover Classification System Land Cover Class Definitions:

Water All areas of open water or permanent ice/snow cover.

11. Open Water - areas of open water, generally with less than 25 percent or greater cover of water (per pixel).

12. Perennial Ice/Snow - All areas characterized by year-long cover of ice and/or snow.

Developed - areas characterized by high percentage (approximately 30% or greater) of constructed materials (e.g. asphalt, concrete, buildings, etc).

21. Low Intensity Residential - Includes areas with a mixture of constructed materials and vegetation. Constructed materials account for 30-80 percent of the cover. Vegetation may account for 20 to 70 percent of the cover. These areas most commonly include single-family housing units. Population densities will be lower than in high intensity residential areas.

22. High Intensity Residential - Includes heavily built up urban centers where people reside in high numbers. Examples include apartment complexes and row houses. Vegetation accounts for less than 20 percent of the cover. Constructed materials account for 80-100 percent of the cover.

23. Commercial/Industrial/Transportation - Includes infrastructure (e.g. roads, railroads, etc.) and all highways and all developed areas not classified as High Intensity Residential.

Barren - Areas characterized by bare rock, gravel, sad, silt, clay, or other earthen material, with little or no green vegetation present regardless of its inherent ability to support life. Vegetation, if present, is more widely spaced and scrubby than that in the greenvegetated categories; lichen cover may be extensive.

31. Bare Rock/Sand/Clay - Perennially barren areas of bedrock, desert, pavement, scarps, talus, slides, volcanic material, glacial debris, and other accumulations of earthen material.

32. Quarries/Strip Mines/Gravel Pits - Areas of extractive mining activities with significant surface expression.

33. Transitional - Areas of sparse vegetative cover (less than 25 percent that are dynamically changing from one land cover to another, often because of land use activities. Examples include forest clearcuts, a transition phase between forest and agricultural land, the temporary clearing of vegetation, and changes due to natural causes (e.g. fire, flood, etc.)

Forested Upland - Areas characterized by tree cover (natural or Semi-natural woody vegetation, generally greater than 6 meters tall); Tree canopy accounts for 25-100 percent of the cover.

41. Deciduous Forest - Areas dominated by trees where 75 percent or more of the tree species shed foliage simultaneously in response to seasonal change.

42. Evergreen Forest - Areas characterized by trees where 75 percent or more of the tree species maintain their leaves all year. Canopy is never without green foliage.

43. Mixed Forest - Areas dominated by trees where neither deciduous nor evergreen species represent more than 75 percent of the cover present.

Shrubland - Areas characterized by natural or semi-natural woody vegetation with aerial stems, generally less than 6 meters tall with individuals or clumps not touching to interlocking. Both evergreen and deciduous species of true shrubs, young

trees, and trees or shrubs that are small or stunted because of environmental conditions are included.

51. Shrubland - Areas dominated by shrubs; shrub canopy accounts for 25-100 percent of the cover. Shrub cover is generally greater than 25 percent when tree cover is less than 25 percent. Shrub cover may be less than 25 percent in cases when the cover of other life forms (e.g. herbaceous or tree) is less than 25 percent and shrubs cover exceeds the cover of the other life forms.

Non-natural Woody - Areas dominated by non-natural woody vegetation; non-natural woody vegetative canopy accounts for 25-100 percent of the cover. The non-natural woody classification is subject to the availability of sufficient ancillary data to differentiate non-natural woody vegetation from natural woody vegetation.

61. Orchards/Vineyards/Other - Orchards, vineyards, and other areas planted or maintained for the production of fruits, nuts, berries, or ornamentals.

Herbaceous Upland - Upland areas characterized by natural or semi- natural herbaceous vegetation; herbaceous vegetation accounts for 75-100 percent of the cover.

71. Grasslands/Herbaceous - Areas dominated by upland grasses and forbs. In rare cases, herbaceous cover is less than 25 percent, but exceeds the combined cover of the woody species present. These areas are not subject to intensive management, but they are often utilized for grazing.

Planted/Cultivated - Areas characterized by herbaceous vegetation That has been planted or is intensively managed for the production of food, feed, or fiber; or is maintained in developed settings for specific purposes. Herbaceous vegetation accounts for 75-100 percent of the cover.

81. Pasture/Hay - Areas of grasses, legumes, or grass-legume mixtures planted for livestock grazing or the production of seed or hay crops.

82. Row Crops - Areas used for the production of crops, such as corn, soybeans, vegetables, tobacco, and cotton.

83. Small Grains - Areas used for the production of graminoid crops such as wheat, barley, oats, and rice

84. Fallow - Areas used for the production of crops that are temporarily barren or with sparse vegetative cover as a result of being tilled in a management practice that incorporates prescribed alternation between cropping and tillage.

85. Urban/Recreational Grasses - Vegetation (primarily grasses) planted in developed settings for recreation, erosion control, or aesthetic purposes. Examples include parks, lawns, golf courses, airport grasses, and industrial site grasses.

Wetlands - Areas where the soil or substrate is periodically saturated with or covered with water as defined by Cowardin et al.

91. Woody Wetlands - Areas where forest or shrubland vegetation accounts for 25-100 percent of the cover and the soil or substrate is periodically saturated with or covered with water.

92. Emergent Herbaceous Wetlands - Areas where perennial herbaceous vegetation accounts for 75-100 percent of the cover and the soil or substrate is periodically saturated with or covered with water.

Entity_and_Attribute_Detail_Citation: NLCD Regional Land Cover Classification System Key Rev. 11/98

Contact_Person: John Clark
Contact_Organization: Michigan Center for Geographic Information
Address_Type: Mailing and physical address of the distribution contact person
Address: 111 S Capitol Ave., 10th Floor
City: Lansing
State_or_Province: MI
Postal_Code: 48933
Country: USA
Contact_Voice_Telephone: 517-373-7910
Contact_Facsimile_Telephone: 517-241-5669
Contact_Electronic_Mail_Address: clarkjs@michigan.gov
Resource_Description: Michigan 1992 NLCD GRID files by County
No warranty, expressed or implied is made and no liability is assumed by the State of Michigan in general or the Michigan Center for Geographic Information in specific as to the accuracy or usability of this data.

Metadata_Date: 20021104
Contact_Person: Daniel Metzger
Contact_Organization: Michigan Center for Geographic Information
Contact_Position: Geographic Specialist
Address_Type: Mailing and physical address of the distribution contact person
Address: 111 S Capitol Ave., 10th Floor
City: Lansing
State_or_Province: MI
Postal_Code: 48933
Country: USA
Contact_Voice_Telephone: 517-373-7910
Contact_Facsimile_Telephone: 517-373-2939
Contact_Electronic_Mail_Address: metzgerd@michigan.gov
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

Generated by mp version 2.6.2 on Tue Nov 05 16:09:45 2002