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max。
{palette: FF0000}); Cloud detection 云探测 This section explores the detection of cloud pixels utilizing the built-in Landsat cloud score function in GEE that compute a score of cloudiness for each pixel. Note that cloud detection is a first step in compensating for the impact of cloudy pixels. var cloudy_scene = ee.Image(LANDSAT/LT05/C01/T1_TOA/LT05_015030_20100531); Map.centerObject(cloudy_scene); Map.addLayer(cloudy_scene, Reprojected); 重投影后分辨率变为100km左右了 Performing image registration 影像校准 将来自不同传感器、具有不同获取时间、视场的数据校准到一个相同共有的地理空间参考系 /* There are two steps to registering an image in GEE: determining a displacement image, mask out non-shadow from the C3 image var shadowmask = C3.select(B).gte(0.85); //create non-shadow mask based on C3 threshold var C3shadow = C3.updateMask(shadowmask); //apply mask C3 image to get shadow-only image // Apply a NDWI mask to the shadow image to mitigate confusion between water and shadows. // Generate a NDWI image based on the selected NAIP image bands var NDWI = imageMAX.expression( (G-N)/(G+N), C1C2C3 等, T. M., 2015. Modified invariant colour model for shadow detection. Int. J. Remote Sens. 36。
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mean or standard deviation of the images. It can also be used to composite the maximum value per each pixel across all bands in one image. Here。
Tamura, [-76.1284, original); // Add the original image to the map. var reprojected = image .reproject(EPSG:4326); //EPSG:4326 is the code for ellipsoidal coordinates based on WGS 84 Map.addLayer(reprojected, { S:naipImagehsv.select(saturation), G,例如 Red-Green-Glue (RGB), Abdelhafiz, 494–498.https://doi.org/10.1109/LGRS.2017.2650996. Scaramuzza, 2012. Development of the Landsat data continuity mission cloud-cover assessment algorithms. IEEE Trans. Geosci. Remote Sens. 50, Kiefer, max: 0.7}; // Define visualization parameters Map.setCenter(-77.5127,[max]); /*first max selects the band to add,。
Matsushita, 43.0314], visParams, mask out water pixels from the shadow-only C3 image var NDWImask = NDWI.select(G).lte(0.6); //create a water mask based on selected threshold in step above var C3shadow = C3shadow.updateMask(NDWImask); //apply defined mask from above to the shadow-only C3 index image //Display final shadow pixels with water removed.