Using TNRISUsing TNRIS

A Guide Created By:A Guide Created By:

Matt SchreinerMatt Schreiner

TNRISTNRIS

Go to the TNRIS website (Go to the TNRIS website (www.tnris.orgwww.tnris.org))

All the data is within the “data All the data is within the “data catalog”catalog”

Go to “data search/download”Go to “data search/download”The other few options are simply links to outside sources, and they usually require a fee for data. Only the data search/download is free on the website

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The next screen requires you to The next screen requires you to indicate which area you need data indicate which area you need data fromfrom

You can provide a county or You can provide a county or quadrangle name, or click the quadrangle name, or click the countycountyEventually, you will need your quadrangle names, which you may not know. On the M:/ drive, there is a folder called “TNRIS_Index”. In it, there are shapefiles that represent Texas quadrangles. Overlay this shapefile on your study area and check the label to see which quadrangle your study area is in.

The TNRIS Index The TNRIS Index ShapefileShapefile

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If you chose a county, the map will If you chose a county, the map will zoom to the county, where you will zoom to the county, where you will need to choose a quadrangleneed to choose a quadrangle

A map similar to the TNRIS_Index appears, but only with roads. That is why you should use the shapefile; you can accurately find your quadrangles and skip this county level step.

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When you get to the quadrangle When you get to the quadrangle level, you can then begin to level, you can then begin to download data for that quadrangle.download data for that quadrangle.

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TNRISTNRISDRGs – Scanned in USGS Topo maps that have already been georeferenced.

DEMs – 30 meter elevation raster for the quadrangle

NEDs- 30 meter DEM for the entire degree block

Hillshade – DEM generated simulation of the sun

NAIP/TOP – Aerial Images

TNRIS ConversionTNRIS Conversion

TNRIS files do not all come ready to TNRIS files do not all come ready to load into ArcMap. load into ArcMap.

Aerial Photos are ready to go into ArcMap as is after un-zipping.

DEMs must be converted to rasters. Look here in ArcMap’s ArcToolbox to make the conversion

Many other files, including NEDs are interchange files (.e00). To convert them, go to ArcCatalog. Click on view > toolbars > ArcView 8x Tools. The Conversion tools box will appear. Click on it, and you will have the option to import from interchange.

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If you are having a hard time finding If you are having a hard time finding data, use the FTP site.data, use the FTP site.

An FTP site is a site that contains multiple files and folders of information and has the appearance of a local hard drive or network drive. When you find the data you want, right click on the icon and tell it to copy it to your drive.