Identification Information Data_Set_Identity: see metadata for individual dataset Identification_Code: Not Applicable Data_Set_Description: This is land use/ land cover digital data collected by USGS and converted to ARC/INFO by the EPA. This data is useful for environmental assessment of land use patterns with respect to water quality analysis, growth management, and other types of environmental impact assessment. Use may be limited due to currency. 1. Abstract U.S. Geological Survey, 1990. Land use and land cover digital data from 1:250,000- and 1:100,000-scale maps. Data User Guide 4. Reston, Virginia. Descriptors: GIS, digital spatial data, land use, land cover, GIRAS 2. Applications that use this data Land use and land cover data LU/LC collected by the USGS NMD is useful for environmental assessment of land use patterns with respect to water quality analysis, growth management, and other types of environmental impact assessment. 2.1 Intended use of data Data are meant to be used by quadrangle, or among adjacent quadrangles where temporally contiguous. Can be used in any geographic application where intermediate scale land use data are appropriate and the dates are representative. 2.2 Limitations of data Each quadrangle of land use data has a different representative date. Date ranges from mid 1970s to early 1980s are common. When joined together these quadrangles will not likely match along edges due to differences in interpretation and time coverage. Edges of each map file were manually digitized and may not join neighboring maps. If GIRASNEAT program has been applied (see LOG at end) then edges have been mathematically recalculated to join without overlap or gaps in coverage with adjacent maps. 3. Attribute discussion The GIRAS series can include several themes of spatial data. The most common, described here, is the land use and land cover data. Land use was mapped and coded using the Anderson classification system (Anderson and others, 1976) which is a hierarchical system of general (level 1) to more specific (level 2) characterization. Some agencies have taken this to a level 3 classification -- but this has not been done in the GIRAS series. The salient attribute managed for this polygon data set in the polygon attribute table (PAT) is the column named LUCODE containing the Anderson level 2 classification. The first digit represents the level one value and the second digit (ones place) represents the subdivision of the level 1 or level 2 value. The Anderson land use codes are: Level 1 Level 2 ------- ------- 1 Urban or built-up land 11 Residental 12 Commercial and services 13 Industrial 14 Transportation, communication, utilities 15 Industrial and commercial complexes 16 Mixed urban or built-up land 17 Other urban or built-up land 2 Agricultural land 21 Cropland and pasture 22 Orchards, groves, vineyards, nurseries and ornamental horticultural areas 23 Confined feeeding operations 24 Other agricultural land 3 Rangeland 31 Herbaceous rangeland 32 Shrub and brush rangeland 33 Mixed rangeland 4 Forest land 41 Deciduous forest land 42 Evergreen forest land 43 Mixed forest land 5 Water 51 Streams and canals 52 Lakes 53 Reservoirs 54 Bays and estuaries 6 Wetland 61 Forested wetland 62 Nonforested wetland 7 Barren land 71 Dry salt flats 72 Beaches 73 Sandy areas not beaches 74 Bare exposed rock 75 Strip mines, quarries, gravel pits 76 Transitional areas 8 Tundra 81 Shrub and brush tundra 82 Herbaceous tundra 83 Bare ground 84 Wet tundra 85 Mixed tundra 9 Perennial snow or ice 91 Perennial snowfields 92 Glaciers 4. Procedures used to create or automate data GIRAS files are received by the USGS or EPA in 9-track ASCII format, one file per quadrangle. Files are loaded onto the hard disk of the computer from tape. Data are then processed with the GIRASARC2 program written in Arc Macro Language, part of the ARC/INFO geographic information system. This program was written by the USGS Water Resources Division to process GIRAS data into a consistent ARC/INFO format with a minimum of intervention. This GIRASARC2 AML program does the following: -- Converts the GIRAS data to ARC/INFO -- Reconstructs topology, creating line and polygon features -- Transforms the coverage into UTM and then, optionally into Albers Equal Area, using the registration points listed in the GIRAS file -- Notes transformation error, writing it to the bottom of the narrative file -- Generates a synthetic neatline based on the mathematically-determined corners of the map -- Loads available documentation into a series of companion documentation files with each data set. -- Data may then be clipped against or extended to the synthetic neatline for ease in merging adjacent maps at a later date 5. Revisions made to data (revision number, date, description) 1.0 Original conversion from GIRAS to ARC (see LOG for date and user ID) 6. Reviews applied to data (review type, date, person, description) Data are reviewed visually by the user responsible for executing the GIRASARC2 program. 7. Related spatial and tabular data sets and programs The GIRASARC2 and GIRASNEAT programs were executed in Arc Macro Language to create this data set. The DOCUMENT AML (version 1.0) was used to manage the documentation 8. References cited Anderson, J.R., Hardy, E.E. Roach, J.T. and Witmer, R.E., 1976, A land use and land cover classification system for use with remote sensor data: U.S. Geological Survey Professional Paper 964, 28 p. U.S. Geological Survey, 1990. Land use and land cover digital data from 1:250,000- and 1:100,000-scale maps. Data User Guide 4. Reston, Virginia. Theme_Keyword: Land Use/Land Cover Data_Currentness_and_Quality Summary: Beginning_Date_of_Information_Content: 1977 Ending_Date_of_Information_Content: Not applicable Thematic_Quality: Unknown Thematic_Accuracy: Unknown Thematic_Accuracy_Explanation: None Logical_Consistency: Unknown Completeness: Unknown Data_Set_Citation: USGS land use land cover digital data Native_Data_Set_Environment: On EPA standard GIS environment of Data General running UNIX as the OS and ARC/INFO. Use_Restrictions: None Access_Restrictions: None Security_Information: None Security_Classification: None Secuity_Handling_Description: None Spatial Reference Native_Spatial_Data_Structure: Vector Horizontal_Coordinate_System_Definition: Geographic_Coordinate_Units: Degrees, minutes, and decimal seconds Map_Projection: Conic Map_Projection_Name: Albers Conical Equal Area Standard_Parallel: 29 30 00 Longitude_of_Central_Meridian: -96 00 00 Latitude_of_Projection's_Origin: 23 00 00 False_Easting: 0.0 False_Northing: 0.0 Grid_Coordinate_System_Name: Universal Transverse Mercator Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Planar_Distance_Units: meters Point/Vector_Horizontal_Encoding_Method: Coordinate Pair Coordinate_Pair_Resolution_Units: Meters Vector_Object_Type: G-Polygon Vector_Object_Count: see metadata for individual dataset Horizontal_Positional_Acccuracy_Explanation: Unknown West_Bounding_Coordinate: see metadata for individual dataset East_Bounding_Coordinate: see metadata for individual dataset North_Bounding_Coordinate: see metadata for individual dataset South_Bounding_Coordinate: see metadata for individual dataset Geographic_Keyword_Name: see metadata for individual dataset Geographic_Keyword_Type: Populated Place Data_Set_Status: Available Maintenance_and_Update_Cycle: Unknown Metadata_Date: 10/17/93 Metadata_Review_Date: Not applicable Metadata_Future_Review_Date: To be determined Metadata_Contact: Ed Partington, Dave Catlin Source_Contribution: Several sources were used to produce this product including National High-Altitude Photography, NASA high altitude aerial photographs, U.S. Census Bureau products, Hydrologic Unit maps, Federal landownership maps and state landownership maps. For a definitive description of these sources see the National Mapping Program Technical Instrctions Data Users Guide 4, "Land Use and Land Cover Digital Data From 1:250,000 and 1:100,000 Scale Maps. Process_Description: see metadata for individual dataset Distribution_Contact: Ed Partington Transfer_Format: ARCINFO 6.1 export format File_Compression_Technique: UNIX file compression Transfer_Size: see metadata for individual dataset Network_Address: sdcdg02.sdc.epa.gov 134.67.8.18 Access_Instruction_Text: Access Wide Area Information Service (WAIS) Online_Filename: see metadata for individual dataset Online_Computer_and_Operating_System: Data General 530 DGUX 5.4.1 Cartridge_Type: 8mm Cartridge_Formatted_Capacity: 1.4 gb Cartridge_Recording_Format: Tar Cartridge_Computer_and_Operating_System: Data General 530 DGUX 5.4.1 Transfer_Instruction: No instructions at this time Entity_Attribute_Information: 1 PATHNAME =/exdisk2/ed/girasnew/work TYPE =ITEM FILENAME =filename.PAT ITEMNAME =AREA ITEMWIDTH = 4 OUTPUTWIDTH = 5 ITEMTYPE =B NUMDECIMAL = 0 USERNAME =ed SHORTDEF =Area of polygon in square coverage units DATADOMAIN =Positive real numbers DATASOURCE =Computed by software ATTACCURACY =Valid for equal-area projection 2 PATHNAME =/exdisk2/ed/girasnew/work TYPE =ITEM FILENAME =filename.PAT ITEMNAME =PERIMETER ITEMWIDTH = 4 OUTPUTWIDTH = 12 ITEMTYPE =F NUMDECIMAL = 3 USERNAME =ed SHORTDEF =Perimeter of polygon in coverage units DATADOMAIN =Positive real numbers DATASOURCE =Computed by software ATTACCURACY =Valid for projection and fuzzy tolerance 3 PATHNAME =/exdisk2/ed/girasnew/work TYPE =ITEM FILENAME =filename.PAT ITEMNAME =KEN# ITEMWIDTH = 4 OUTPUTWIDTH = 5 ITEMTYPE =B NUMDECIMAL = 0 USERNAME =ed SHORTDEF =Internal feature number DATADOMAIN =Sequential unique positive integer DATASOURCE =Computed by software ATTACCURACY =No qualifications 4 PATHNAME =/exdisk2/ed/girasnew/work TYPE =ITEM FILENAME =filename.PAT ITEMNAME =KEN-ID ITEMWIDTH = 4 OUTPUTWIDTH = 10 ITEMTYPE =B NUMDECIMAL = 0 USERNAME =ed SHORTDEF =User-assigned feature number DATADOMAIN =Integer DATASOURCE =Same as LUCODE initially ATTACCURACY =Not applicable 5 PATHNAME =/exdisk2/ed/girasnew/work TYPE =ITEM FILENAME =filename.PAT ITEMNAME =LUCODE ITEMWIDTH = 2 OUTPUTWIDTH = 2 ITEMTYPE =I NUMDECIMAL = 0 USERNAME =ed SHORTDEF =Anderson level II land use classification DATADOMAIN =See narrative file DATASOURCE =U.S. Geological Survey NMD ATTACCURACY =Unverified in conversion process Contact_Person_Primary: Ed Partington Contact_Organization: U.S. Environmental Protection Agency