ui.Map.addLayer

将指定的 EE 对象作为图层添加到地图中。

返回新的地图图层。

用法返回
Map.addLayer(eeObject, visParams, name, shown, opacity)ui.Map.Layer
参数类型详细信息
此：ui.mapui.Mapui.Map 实例。
eeObjectCollection|Feature|Image|MapId要添加到地图中的对象。
visParamsFeatureVisualizationParameters|ImageVisualizationParameters，可选可视化图表参数。对于 Image 和 ImageCollection，请参阅 ee.data.getMapId 以了解有效参数。对于 Feature 和 FeatureCollection，唯一支持的键是“color”，以 RRGGBB 格式的 6 字符十六进制字符串表示。
name字符串，可选图层的名称。默认值为“Layer N”。
shown布尔值，可选一个标志，用于指示图层是否应默认处于开启状态。
opacity数字，可选图层的不透明度，以介于 0 到 1 之间的数字表示。默认为 1。

示例

代码编辑器 (JavaScript)

// Define a ui.Map widget and add it to the cleared ui.root.
var map = ui.Map();
ui.root.clear();
ui.root.add(map);
map.setCenter(-121.87, 37.44, 9);

// A Sentinel-2 surface reflectance image.
var image = ee.Image('COPERNICUS/S2_SR/20210109T185751_20210109T185931_T10SEG');

// Set multi-band RGB image visualization parameters. If the "bands" parameter
// is not defined, the first three bands are used.
var rgbVis = {
  bands: ['B11', 'B8', 'B3'],
  min: 0,
  max: 3000
};
map.addLayer(image, rgbVis, 'Multi-band RGB image');

// Set band-specific "min" and "max" properties.
var rgbVisBandSpec = {
  bands: ['B11', 'B8', 'B3'],
  min: [0, 75, 150],
  max: [3500, 3000, 2500]
};
map.addLayer(image, rgbVisBandSpec, 'Band-specific min/max');

// If you don't specify "min" and "max" properties, they will be determined
// from the data type range, often resulting in an ineffective color stretch.
map.addLayer(image.select('B8'), null, 'Default visParams');

// If an image layer has already been styled, set "visParams" as null.
var imageRgb = image.visualize(rgbVis);
map.addLayer(imageRgb, null, 'Pre-styled image');

// Use the "palette" parameter with single-band image inputs to define the
// linear color gradient to stretch between the "min" and "max" values.
var singleBandVis = {
  min: 0,
  max: 3000,
  palette: ['blue', 'yellow', 'green']
};
map.addLayer(image.select('B8'), singleBandVis, 'Single-band palette');

// Images within ImageCollections are automatically mosaicked according to mask
// status and image order. The last image in the collection takes priority,
// invalid pixels are filled by valid pixels in preceding images.
var imageCol = ee.ImageCollection('COPERNICUS/S2_SR')
                   .filterDate('2021-03-01', '2021-04-01');
map.addLayer(imageCol, rgbVis, 'ImageCollection mosaic');

// FeatureCollection, Feature, and Geometry objects can be styled using the
// "color" parameter.
var featureCol = ee.FeatureCollection('WCMC/WDPA/current/polygons');
map.addLayer(featureCol, {color: 'purple'}, 'FeatureCollection');