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Reclassify Slope in Google Earth Engine using DEM 

Kapil Dev Adhikari
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Create a slope raster using 30 m SRTM DEM and then reclassify it based on range of values (degree) in order to estimate what type of slope has the biggest coverage (area).
A Digital Elevation Model (DEM) file stores elevation data that can be used to extract slope parameters and to perform surface analysis.
GEE script link: drive.google.com/file/d/19Zla...

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1 июл 2021

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Комментарии : 13   
@spritualchannel2779
@spritualchannel2779 2 года назад
Thank u brother, it uses me a lot
@varampornwongworapath4353
@varampornwongworapath4353 9 месяцев назад
Hi kapil, Can you teach me how to convert DEM data to terrain analysis data? I would like to know if GEE can be used in place of SAGA? Thanks again for sharing your expertise in this matter.
@KapildevAdhikari
@KapildevAdhikari 9 месяцев назад
Sure
@KapildevAdhikari
@KapildevAdhikari 9 месяцев назад
There are two methods to terrain analysis in GEE, 1st method: // A digital elevation model. // use NASA, USGS/SRTM, or ASTER dem product// var dem = ee.Image('NASA/NASADEM_HGT/001').select('elevation'); // Calculate slope. Units are degrees, range is [0,90). var slope = ee.Terrain.slope(dem); // Calculate aspect. Units are degrees where 0=N, 90=E, 180=S, 270=W. var aspect = ee.Terrain.aspect(dem); // Display slope and aspect layers on the map. Map.setCenter(-123.457, 47.815, 11); Map.addLayer(slope, {min: 0, max: 89.99}, 'Slope'); Map.addLayer(aspect, {min: 0, max: 359.99}, 'Aspect'); 2nd direct method: // Use the ee.Terrain.products function to calculate slope, aspect, and // hillshade simultaneously. The output bands are appended to the input image. // Hillshade is calculated based on illumination azimuth=270, elevation=45. var terrain = ee.Terrain.products(dem); print('ee.Terrain.products bands', terrain.bandNames()); Map.addLayer(terrain.select('hillshade'), {min: 0, max: 255}, 'Hillshade'); //obtain and display ‘slope’, ‘aspect’ same as Hillshade. To export the terrain data to google drive: // A digital elevation model. var dem = ee.Image('NASA/NASADEM_HGT/001').select('elevation'); var terrain = ee.Terrain.products(dem); // Define the region of interest as a geometry. // var roi = // Export the terrain data to Google Drive. Export.image.toDrive({ image: terrain, description: 'terrain_data', scale: 90, // Adjust the scale to your needs. region: roi, folder: 'your_export_folder', // Specify your export folder. maxPixels: 1e13 // You may need to adjust this value based on your image. });
@varampornwongworapath4353
@varampornwongworapath4353 9 месяцев назад
@@KapildevAdhikari thank you very much 🙏🏻🙏🏻🙏🏻🙏🏻
@boi_ratie
@boi_ratie 2 года назад
Hi Kapil, could you please help with calculating a time series of LST (Land Surface Temperature ) for a period of 15 years ? in GEE
@KapildevAdhikari
@KapildevAdhikari 2 года назад
Ok
@boi_ratie
@boi_ratie 2 года назад
Please provide me with your email if you don’t mind. I have a few questions and i think you might be able to help me.
@KapildevAdhikari
@KapildevAdhikari 2 года назад
@@boi_ratie kapildevadk@gmail.com
@shanhong2341
@shanhong2341 9 месяцев назад
hi, how or where do i find the Vietnam data if my site is at vietnam?
@KapildevAdhikari
@KapildevAdhikari 9 месяцев назад
You can find dem data of anywhere in GEE
@Hedieh7547
@Hedieh7547 Год назад
hello, do you have soiltexture code i really need can you help me please
@KapildevAdhikari
@KapildevAdhikari Год назад
DM at kapildevadk@gmail.com
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