Short Description of background GIS Data for Online LTHIA model

Layer name

Data Name

Source

Description

Format

Basic Themes

roads

All County Roads

TIGER

(In Indiana) Roads that can be used to “geocode” a street address, placing it at a specific location on the map. From INDOT 2005 road layer on Indiana Geological Survey (IGS) GIS Atlas for Indiana

http://129.79.145.7/arcims/statewide_mxd/index.html

Line

railroads

Railroads

TIGER

Railroads, from Census 2000 data set on www.geographynetwork.com

Line

streams

Streams

USGS

National Hydrography Database, high resolution streams and other water features. Some GNIS names added. Converted from geodatabase to shapefile for mapserver.

Available on http://nhd.usgs.gov/data.html

Line

lakes_rivers

County scale Lakes and Rivers

USGS

Polygons from NHD high resolution data.

Available on http://nhd.usgs.gov/data.html

Polygon

townships

Civil Townships

TIGER

The names and boundaries of the townships in a county. From Census 2000 dataset on www.geographynetwork.com

Polygon

cities_towns Municipal Bounds TIGER Municipal outlines from 2000 census, for census designated places. From Census 2000 dataset on www.geographynetwork.com Polygon
Metro Planning Buffer Buffer on Municipal Bounds CAAGIS 3 mile buffer on Municipal outlines from 2000 census, for census designated places larger than 7000 population Polygon
Landuse Land Use USGS 30-m resolution National Land Cover Database (based primarily on Landsat TM 2001 imagery.) Available from www.geodata.gov Polygon
highways Main Highways TIGER Statewide major highway network. Created from TIGER data. From Census 2000 data set on www.geographynetwork.com Line
rivers Lakes and Rivers USGS Major water features from the National Hydrography Data, statewide themes from the National Atlas (http://www.nationalatlas.gov/natlas/NatlasStart.asp) Line
counties Counties TIGER Names and extents of all counties. Available from the National Atlas (http://www.nationalatlas.gov/natlas/NatlasStart.asp) Polygon

orthophotos

Orthophotos

USGS/NRCS

(In Indiana) 1-m resolution color photos from summer 2003, also displays 1 meter resolution B/W photos from winter 1998 from NRCS through the Microsoft Terraserver project.

Image (.sid)

Topomaps

Topographic map images

USGS

(In Indiana) Scanned, rectified image of a U.S. Geological Survey (USGS) 7.5 minute (1:24,000 scale) topographic map. Provided by NRCS.

Image (.tif)

urbanized_area Census 2000 determined "urbanized_areas" TIGER These areas, determined as "urbanized' by the year 2000 U.S.CENSUS were then adopted as stormwater management areas in Indiana. some modification has ooccurred since which is mnpot reflected in this layer. this is a general guide, not a regulatory outline. polygon

Ned_dem

DEM (Elevation)

USGS

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

This DEM as used is 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 809 cells (10 meter cells) lines
landuse land use CAAGIS EROS 2001 landuse cut to 8-digit watershed with buffer Grid
State bridges points for bridges IGS Hi accuracy system 1 bridge layer with NBI points
County bridges points for bridges IGS Hi accuracy county bridge layer points
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

USDA-NRCS

SSURGO soil 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.

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

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


All data in UTM Zone 16 N, NAD83

Polygon, Line, and Point data are all in ESRI shapefile (.shp) format

Ned_dem is in grid format, and requires ArcView Spatial Analyst extension to be viewed