GEE使用表格生成要素集

使用表格生成要素集

主要功能

使用在线数据筛选生成要素集

代码

// Create a FeatureCollection from a Fusion Table.

// Select "desert" features from the TNC Ecoregions fusion table.
var fc = ee.FeatureCollection('ft:1Ec8IWsP8asxN-ywSqgXWMuBaxI6pPaeh6hC64lA')
  .filter(ee.Filter.stringContains('ECO_NAME', 'desert'));

// Paint into a blank image.  Cast to byte() so we can use more than 1 color.
var image1 = ee.Image().byte().paint(fc, 'ECO_NUM');

// Display the image using random colors for each value.
Map.setCenter(-109.687, 30.524, 5);
Map.addLayer(image1.randomVisualizer());

步骤分析

1. 使用在线数据，筛选字段属性
2. 将筛选出的要素输出到一个数据对象中
3. 设置地图中心，缩放等级
4. 添加图层，展示结果

主要方法

1. ee.FeatureCollection()
   FeatureCollections can be constructed from the following arguments:

• A string: assumed to be the name of a collection.
• A single geometry.
• A single feature.
• A list of features.
• A computed object: reinterpreted as a collection.
  Arguments:
  args (ComputedObject|Feature|FeatureCollection|Geometry|List