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United States Department of Agriculture

Agricultural Research Service

Research Project: DEVELOPMENT OF A GIS-BASED RUSLE2 INTERFACE TEMPLATE FOR USE WITH IOWA’S LIDAR DIGITAL ELEVATION DATA
2012 Annual Report


1a.Objectives (from AD-416):
1. Define end-user requirements for the GIS-based RUSLE2 interface and establish evaluation criteria for the final product. 2. Establish clear objectives and guidelines for use and development of the tool based on input from key agency partners. 3. Identify and evaluate existing methodologies for using high-resolution DEMs to calculate slope length and steepness, as well as determine the most appropriate aggregation of soil loss calculations across a field landscape. 4. Develop a working prototype of a GIS-based RUSLE2 template. 5. Optimize the current RUSLE2 application to handle multiple calculations. 6. Provide demonstrations for GIS-based RUSLE2 template to SWCDs statewide. 7. Provide training and support for statewide use of the GIS-based RUSLE2 template.


1b.Approach (from AD-416):
Develop a summary report of end-user requirements and agency objectives based on stakeholder meetings and interviews. Prepare a list of final evaluation criteria for the GIS-based RUSLE2 template. Prepare a report on most appropriate methodology for using DEMs to interact with RUSLE2 and most appropriate application of RUSLE2 soil loss calculation across a field landscape. Document functional requirements for a GIS-based tool for statewide application. Evaluate slope length and steepness algorithms for applying LiDAR-derived DEMs to RUSLE2 model. Prepare a beta version of GIS-based RUSLE2 for stakeholder evaluation and obtain feedback on the proposed tool. Proivde trainings for beta users on operation of GIS-based RUSLE2 template and and develop a written survey tool for stakeholder evaluation as a precursor to a summary report of stakeholder evaluation results. Prepare an enhanced GIS-based RUSLE2 template based on end-user experiences and requirements.


3.Progress Report:

Progress in this effort has been to use the high-resolution digital evaluation models (DEMs) to calculate slope length and steepness and link these to the most appropriate aggregation of soil loss calculations across a field landscape. Applicable of the DEMs with the GIS-based forms the foundation for the optimization of the Revised Universal Soil Loss Equation, Version 2 (RUSLE2) model to estimate erosion at the landscape scale and remains the last aspect of model development effort to make this system capable for a GIS-based system for delivery to users.


Last Modified: 7/22/2014
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