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If anyone has the Radar Forest Degradation Index code GEE please send it to me.
25 July 2025
26 July 2025
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Hello everyone I need help calculating evapotranspiration using the METRIC algorithm. Does anyone have a   educational video or even the code?
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id 7994539986If anyone has the Radar Forest Degradation Index code GEE please send it to me.
// Define the Area of Interest (AOI) // Replace with your own geometry or draw one in the GEE interface var aoi = table; // Define the time period var startDate = '2024-01-01'; var endDate = '2024-12-31'; // Load the Sentinel-1 GRD collection var s1Collection = ee.ImageCollection('COPERNICUS/S1_GRD') .filterBounds(aoi) .filterDate(startDate, endDate) .filter(ee.Filter.listContains('transmitterReceiverPolarisation', 'VV')) .filter(ee.Filter.listContains('transmitterReceiverPolarisation', 'VH')) .filter(ee.Filter.eq('instrumentMode', 'IW')); // Function to convert from dB to linear function toLinear(image) { return image.expression('pow(10, db/10)', {'db': image}); } // Function to calculate RFDI function calculateRfdi(image) { var vv = image. select('VV'); var vh = image. select('VH'); // Convert to linear scale var vvLinear = toLinear(vv); var vhLinear = toLinear(vh); // Calculate RFDI var rfdi = (vvLinear.subtract(vhLinear)).divide(vvLinear.add(vhLinear)).rename('RFDI'); return image. addBands(rfdi); } // Apply the RFDI calculation to the collection var rfdiCollection = s1Collection. map(calculateRfdi); // Create a median composite var rfdiMedian = rfdiCollection.select('RFDI').median(); // Define visualization parameters for RFDI var rfdiVisParams = { min: -1, max: 1, palette: ['#d7191c', '#fdae61', '#ffffbf', '#abdda4', '#2b83ba'] // Red to Blue palette }; // Center the map and add the RFDI layer Map. centerObject(aoi, 13); Map.addLayer(rfdiMedian.clip(aoi), rfdiVisParams, 'RFDI'); // Optional: Display the median VV and VH backscatter in dB for comparison var vvMedian = s1Collection.select('VV').median(); var vhMedian = s1Collection.select('VH').median(); var s1VisParams = {min: -25, max: 0}; Map.addLayer(vvMedian.clip(aoi), s1VisParams, 'VV Median (dB)'); Map.addLayer(vhMedian.clip(aoi), s1VisParams, 'VH Median (dB)'); Try this code, but I'm not sure.
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