Geographic Information Systems Other Digital Data

1. Digital Line Graph ► Base cartographic data, distributed by USGS Map created from USGS DLG culture data showing contours, roads, section lines, lakes and streams

1. (1) DLG - Data Content ► Planimetric data - include transportation, hydrography, administrative, and political boundaries ► Topographic data - portray relief ► Include spatial data, attribute data, and topology

1. (2) Data Availability ► Large-Scale (1:24,000) ► Intermediate-Scale (1:100,000) ► Small-Scale (1:2,000,000)

DLG Data Availability.. 1:24,0007.5'x7.5' 1:100,00030'x30'1:2,000,000multi-states Boundaries - state, county, city ××× Hydrography -streams and water bodies ××× Public land survey system - rectangular system ×× Transportation - roads/trails, railroads, pipelines ××× Other manmade structures - ski lift × Hypsography - contour lines ××× Surface cover - vegetative × Non-vegetative surface cover - sand, gravel, etc × Survey control and markers - positions and elevations × Map scale Data content

1.(2) Large-Scale (1:24,000) DLGs ► Correspond to the USGS 1:24,000 scale topographic quadrangle maps ► Primarily cast to the UTM projection system, but some are cast to the State Plane coordinate system

Streams layer of Clarence

1:24,000-Scale DLG data.. West Rapid City, SD

1.(2) Intermediate-Scale (1:100,000) DLG ► Derived from USGS 30x60-minute quadrangle maps ► Cast to the UTM projection system and are referenced to either NAD27 or NAD83 ► Available products : - Individual 1:100,000 DLGs - Individual 1:100,000 DLGs - 1:100,000-Scale Hydrography - 1:100,000-Scale Hydrography and Transportation and Transportation

1:100,000-Scale DLG data.. Coeur D'Alene, ID-MT

1.(2) Small-Scale (1:2,000,000) DLG ► Derived from the USGS sectional maps from the U.S. National Atlas ► Available products : Current: date between 1990 and 1994 Current: date between 1990 and 1994 Historical between 1973 and 1980 Historical between 1973 and 1980

Example of 1:2,000,000-Scale DLG Data of the Illinois and Missouri States Hydrography Boundaries, hydrography, and roads

2. Land Use and Land Cover Digital Data (LULC) ► Distributed by USGS - 1:250, x1 degree - 1:100, x60 minutes

2. LULC Data Contents (1) Land use and land cover Anderson Classification System Level I (2) Political unit state, county, and city boundaries (3) Census county subdivision census tracts for MSA (4) Hydrologic unit An 8-digit Hydrological Unit Code, region, sub-region, accounting, and cataloging unit (5) Federal land ownership

Anderson Classification System Level I 1 Urban or build-up land 2Agricultural 3Rangeland 4 Forest land 5Water 6Wetland 7 Barren land 8Tundra 9 Perennial snow or ice

1:100,000 LULC Data Anderson classification system

1:250,000 LULC Data Spokane, WA, land use/land cover, census, and political units

National Land Cover Database (October 1999 Status)

Hydrologic Unit An 8-digit Hydrological Unit Code, region, sub-region, accounting, and cataloging unit

3. Soils Data ► Developed by USDA Natural Resources Conservation Service (NRCS) ► Soil Survey Geographic Data Base (SSURGO) ► State Soil Geographic Data Base (STATSGO) ► National Soil Geographic Data Base (NATSGO)

3. Soils - SSURGO ► Soil Survey Geographic Data Base (SSURGO) ► 1:24,000, 7.5'x7.5'quads ► Based on aerial photographs and field survey ► Map unit: soil series ► Attributes: physical, chemical, biological, land use, etc.

Soils SSURGO

Soils - STATSGO ► State Soil Geographic Data Base (STATSGO) ► 1:250,000, 1x2 degree coverage ► Map unit: soil association ► Attribute: 60 soil properties ► Attribute structure

STATSGO Map Unit STATSGO data user guider page 5

STATSGO Map Unit.. ► STATSGO map units consist of 1 to 21 components ► For each component, there are 60 soil properties ► For each component, there are 1 to 6 soil layers ► For each layer, there are 28 soil properties; for example, percent clay ► A map unit identifier created by concatenation of the two-character State FIPS code and a three- digit Arabic number. It uniquely identifies a map unit within a State

STATSGO Attributes A set of relational tables is used to store the attributes for the Map Unit and its Components

3. Soils - NATSGO ► National Soil Geographic Data Base (NATSGO) ► 1:7,500,000 ► Used primarily for national, regional, and multi- state resource assessment, planning, and monitoring

UNESCO Soils The Digital Soil Map of the World (version 3.0) was released in May 1994 Scale of 1:5,000,000

4. Digital Raster Graphics Developed by USGS ► A raster image of a scanned USGS topographic map georeferenced to the UTM grid ► Useful as a background layer in a GIS, or to be merged with other digital data to produce a hybrid digital file

4. New York State Data Sets ► ► ►

Example USGS DLG (Digital Line Graph) file showing roads, streets, rivers, etc

Land Cover Map of the Unites States

3. Soils - SSURGO Map Unit

STATSGO Table Relationships STATSGO data user guider page 10 ► ► A set of relational tables is used to store the attributes for the Map Unit and its Components

STATSGO data user guider page 10 ►