Скачать или смотреть GIS4Dev: สอน Google Earth Engine (Export Data)

สอน Google Earth Engine

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************************** Code Here (6_01_Export) ************************
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var l8 = ee.ImageCollection('LANDSAT/LC08/C01/T1_SR') //Load LC8 Images
.filterDate('2018-1-1', '2018-4-30') //Filter by date
.select(['B5','B4']) //Select Bands 5,4
.filterMetadata('CLOUD_COVER', 'less_than', 2) //Filter by cloud less than 20%
.filterBounds(geometry) //Filter by geometry
.median(); //If some ares has more than 1 LC8 image, do median for calculate new DN.

var NDVI = l8.normalizedDifference(['B5', 'B4']); //NDVI Formula ( NIR-RED/NIR+RED )

Map.setCenter(100.36, 14.62, 10); //set map center
Map.addLayer(NDVI, { min: -1, max: 1 }, 'NDVI (ANG THONG)'); //Add NDVI layer to map

Export.image.toDrive({ image: NDVI, description: 'NDVI_ANGTHONG', scale: 30, region: geometry });