Loss Parameters Calculation

Pubblicato il 3 luglio 2025 alle ore 09:32

Download Soil Data

1. Download the SSURGO Bulk Downoader Tool for ArcGIS Pro or QGIS. Follow this tutorial.

2. Download the 2024 NLCD (National Land Cover Database). Follow this tutorial.

ArcGIS Pro

1. Add to the Map the watershed shapefile.

2. Create an internal buffer of your shapefile (remember that the buffer distance must be negative, for example: -1000). Follow this tutorial.

3. Add the SSURGO Bulk Downloader.tbx tool to the ArcGIS Toolboxes in the Project Catalog. Follow this tutorial.

4. Use the SSURGO Bulk Dowloader. Follow this tutorial.

At this point, you should have a layer representing your watershed (with the internal buffer), created by merging the county layers and clipping them to the boundary of your watershed.

5. If your layer is not already projected in a projected coordinate system, use the Project tool. Follow this tutorial.

For example, for the State of New York, the recommended projected coordinate system is...

  • Full name: NAD_1983_StatePlane_New_York_East_FIPS_3101_Feet

  • EPSG code: 2260

  • Units: feet (which can be easily converted to meters or kilometers)

  • Suitable for: the eastern part of the state, including New York City

6. Use the Join Table tool to add soil data fields (e.g., HSG) to the watershed layer by joining with the text files contained in the "tabular" output folder. Follow this tutorial.

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