如何仅显示 Google Earth Engine 无监督分类中的一个集群

Question

假设我们有以下无监督分类代码。我的目标是确定该地区的水体。我如何屏蔽其他类（簇）并在我的结果中只映射其中一个簇（水体）：

// Load a pre-computed Landsat composite for input

var input = ee.Image('LANDSAT/LE7_TOA_1YEAR/2001');

// Define a region in which to generate a sample of the input.

var region = ee.Geometry.Rectangle(29.7, 30, 32.5, 31.7);

// Display the sample region.

Map.setCenter(31.5, 31.0, 8);

Map.addLayer(ee.Image().paint(region, 0, 2), {}, 'region');

// Make the training dataset.


var training = input.sample({
  region: region,
  scale: 30,
  numPixels: 5000
});

// Instantiate the clusterer and train it.

var clusterer = ee.Clusterer.wekaKMeans(5).train(training);

// Cluster the input using the trained clusterer.

var result = input.cluster(clusterer);

// Display the clusters with random colors.

Map.addLayer(result.randomVisualizer(), {}, 'clusters');

Answer 1

我只需要簇 (0)，这样我就可以使用下面的代码屏蔽类的其余部分：

// showing only one cluster.
var subset = result.select("cluster").eq(0).selfMask();

如何仅显示 Google Earth Engine 无监督分类中的一个集群

How to show only one of the clusters in Goole Earth Engine unsupervised classification

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