GEE（Google Earth Engine）——Filtered Composite

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发布于 2024-02-01 20:00:28

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发布于 2024-02-01 20:00:28

文章被收录于专栏：GEE数据专栏，GEE学习专栏，GEE错误集等专栏GEE数据专栏，GEE学习专栏，GEE错误集等专栏

这个例子主要是讲解一下用美国犹他州和科罗拉多州进行区域筛选并且求当地影像的最大、最小、中位数以及平均数等等的运算，一起来看代码：

// Filter to only include images intersecting Colorado or Utah.
var polygon = ee.Geometry.Polygon({
  coords: [[[-109.05, 37.0], [-102.05, 37.0], [-102.05, 41.0], // Colorado
            [-109.05, 41.0], [-111.05, 41.0], [-111.05, 42.0], // Utah
            [-114.05, 42.0], [-114.05, 37.0], [-109.05, 37.0]]],
  geodesic: false
});

// Create a Landsat 7 composite for Spring of 2000, and filter by
// the bounds of the FeatureCollection.
var collection = ee.ImageCollection('LANDSAT/LE07/C01/T1')
    .filterDate('2000-04-01', '2000-07-01')
    .filterBounds(polygon);

// Compute the median in each band, in each pixel.自己可以去逐个均值、最大最小尝试！
var median = collection.max();
                       //.mean();
                       //.max();
                       //.median();

// Select the red, green and blue bands.
var result = median.select('B3', 'B2', 'B1');
Map.addLayer(result, {gain: [1.4, 1.4, 1.1]});
Map.setCenter(-110, 40, 5);

这张是.max()最大值效果，云层比较多