首页 > 解决方案 > 如何将图像集合剪辑到特征集合的几何图形

问题描述

我正在尝试将图像集剪辑到阿尔伯塔省,但 filterBounds 不起作用。感谢您提供的任何帮助!我希望剪切图像集合,而不仅仅是地图上的图层,所以当我对图像集合执行操作时,它们只会针对阿尔伯塔执行

var Admins = ee.FeatureCollection("FAO/GAUL/2015/level1");
var Alberta = Admins.filter(ee.Filter.eq('ADM1_NAME', 'Alberta'));
print(Alberta)
Map.addLayer(Alberta, {}, 'Alberta')
Map.centerObject(Alberta, 6)

//Load NTL data for 2018, find the median value for each pixel
var dataset = ee.ImageCollection('NOAA/VIIRS/DNB/MONTHLY_V1/VCMSLCFG')
                  .filter(ee.Filter.date('2018-12-01', '2018-12-31'))
                  .filterBounds(Alberta); //here I'm trying to clip the image collection
var nighttime = dataset.select('avg_rad');
var nighttimeVis = {min: 0.0, max: 60.0};
print(nighttime)
Map.addLayer(nighttime.median(), nighttimeVis, 'Nighttime'); //this layer still shows the whole world :-(

标签: google-earth-engine

解决方案


一种简单的方法是:

var dataset = ee.ImageCollection('NOAA/VIIRS/DNB/MONTHLY_V1/VCMSLCFG')
                  .filter(ee.Filter.date('2018-12-01', '2018-12-31'))
                  .map(function(image){return image.clip(Alberta)});

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