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 - L-THIA GIS ArcView Extension Version 2.3
 - Released on Jan. 10, 2003.

 - To run L-THIA GIS, you need an ArcView 3.x and Spatial Analyst extension.
   (Note: not compatible with ArcGIS)

 - You can download the latest version of the L-THIA ArcView extension
   at http://www.ecn.purdue.edu/runoff/

 - Contact Dr. Bernie Engel (engelb@purdue.edu) for more information. 

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The "lthia_gis_ext_v23_and_sample_gis_data.zip" contains 5 files, 
except the README file that you are viewing now.

1) "lthiapc.avx",                                  -- L-THIA GIS extension
2) "lthia_setup.avx",                              -- L-THIA GIS setup extension
3) "lthianps-yearly-average.exe",                  -- L-THIA model executable
4) "cn_table.txt", and                             -- Curve Number (CN) table 
5) "lthia_sample_gis_data_and_rainfall_data.exe".  -- L-THIA GIS data and rainfall data.
    (It contains land use and soil GIS data with rainfall data.)

********** all input data must have horizontal units in meters****
User must have data projected to coordinate system such as UTM.
Geographic (Lat-long) or State Plane Feet will yield incorrect volumes and loadings.
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==> 1) First, you need to move two extensions (lthiapc.avx and lthia_setup.avx) 
       to the extensions folder of ArcView software 
       (probably c:\esri\av_gis30\arcview\ext32).

==> 2) Then, move lthianps-yearly-average.exe 
       to the bin folder 
       (probably c:\esri\av_gis30\arcview\bin32).

==> 3) You need to move cn_table.txt to your working directory that will be 
       used for the L-THIA analysis.  This is the directory that will contain 
       the land use and soil GIS data you plan to use.

==> 4) Finally, execute self-extracting "lthia_sample_gis_data_and_rainfall_data.exe" 
       to uncompress L-THIA GIS data and rainfall data if you don't have land use and 
       soil GIS data ready.

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