Difference between revisions of "User:Abenk"
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==Automatically Calculating USLE using GISus-M== |
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=What is USLE= |
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The Universal Soil Loss Equation (USLE) allows one to calculate the long-term average soil erosion rates for mainly agricultural lands. When calculating the USLE, five major factors must be taken into consideration: |
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A = R * K * LS * C * P |
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Where: |
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A is the potential long-term erosion rate in tonnes per hectare |
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R is the rainfall run off factor |
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K is the soil erodibility factor |
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LS is the slope length-gradient factor |
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C is the crop factor |
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P is the conservation practices factor |
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Classically, the LS factor was estimated by hand, with complex slopes being broken down into segments. However with the advent of high-resolution open source data, such as South-Western Ontario Orothophotography (SWOOP), LS factor can be calculated through computational means. SWOOP 2010 has a resolution of 20cm and a horizontal accuracy of 50cm, and as such is suitable for calculating the USLE. |
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=GISus-M= |
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GISus-M was created by the Universidade Federal do Reconcavo da Bahia, and is an add-in for ArcMap that is written in C#. To use the add-in, the user must run the ESRIADDIN file that is contained in the .rar archive. To run GISus-M in ArcMap, one must have prepared all the requisite files for calculating USLE, namely, a raster representing the R, K, LS, and C factors - the P factor is optional and can be included with the C factor. |
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[[File:2.png|200px|thumb|left|Exampe of the GUI of GISus-M]] |
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