Sounds like there must be an issue with the tool you downloaded. If I were you, I would attempt to run this with the Zonal Statistics as Table tool in ArcMap. Try following these steps: 1) Place all of your buffers in one feature class. 2) For your raster, open the attribute field and select only the forested pixels. 3) Open the Zonal Statistics as Table tool. 4) Use your buffer for the input feature data and select your our unique identifier field as your Zone field. 5) Under Statistics type, leave as All. 6) Run the tool. 7) Once the table gets generated, you’ll have a count of all the forested pixels within each buffer. 😎 Add a new field titled ‘ForestedAcres’ and calculate your Count field by 0.222394 to get your total forested acres. 9) Add another field called ‘BufferAcres’ and calculate the total acres for each buffer. 10) Add another field called ForestedPerc and use Field Calculator to divide your ForestedAcres by your BufferAcres field to find the percentage of forested acres. ex. ForestedAcres/BufferAcres * 100
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