Short Description of background GIS Data for Online LTHIA model

Layer name

Data Name

Source

Description

Format

Basic Themes

streams

NHD Water features

USGS

National Hydrography Database, high resolution streams and other water features. Streaming layer from EPA Waters web mapping services:

http://www.epa.gov/waters/geoservices/index.html.

Layers available on http://nhd.usgs.gov/data.html in 2011 used to hydrologically correct DEMS.

Line

Landuse Land Use USGS 30-m resolution National Land Cover Database2006. Available from www.geodata.gov Polygon

Ned_dem

DEM (Elevation)

USGS

2011 version 30-m resolution National Elevation Data . This version is available from the
U.S. Geological Survey National Elevation Dataset (NED)

This DEM is used with sinks filled and with stream paths (NHD High-resolution water features) "burned-in" to promote correct flow paths.

Grid

Calc. flowpath DEM delineated flowpath CAAGIS accumulated flow starting at catchment of 250 cells (30 meter cells) lines
Landuse land use CAAGIS NLCD 2006 landuse cut to 8-digit watershed Grid
10-digit watershed DEM delineated watershed USDA-NRCS

complex of 10 digit watersheds,

Available for Indiana at http://datagateway.nrcs.usda.gov/

polygon
12-digit watershed DEM delineated watershed USDA-NRCS

complex of 12 digit watersheds,

Available for Indiana at http://datagateway.nrcs.usda.gov/

polygon

Hydrologic Soils

SSURGO or STATSGO

USDA-NRCS

SSURGO soil series or STATSGO soil associations (2009) data. Processed to use the majority hydrologic soil type for each mapping unit. Open polygons in original data (mostly urban and disturbed soils) are assigned class D.

Grid

Acronyms Used:

FEMA: Federal Emergency Management Agency

IDEM: Indiana Department of Environmental Management

IDNR: Indiana Department of Natural Resources

NASS: USDA National Agricultural Statistics Service

NRCS: USDA Natural Resources Conservation Service

OISC: Office of the Indiana State Chemist

TIGER: US Census Bureau Topologically Integrated Geographic Encoding and Referencing (TIGER®)

US FWS: United States Fish and Wildlife Service

USGS: United States Geological Survey