Google Earth Engine(GEE)——可视化动态图

var geometry = 
    /* color: #d63000 */
    /* shown: false */
    /* displayProperties: [
      {
        "type": "rectangle"
      }
    ] */
    ee.Geometry.Polygon(
        [[[116.3170431824926, 39.951392210363046],
          [116.3170431824926, 39.86079576415406],
          [116.4708517762426, 39.86079576415406],
          [116.4708517762426, 39.951392210363046]]], null, false);
// 矢量 
var aoi = geometry
print(aoi);
Map.addLayer(aoi);
var centroid = aoi.centroid(1)
print(centroid);
var coors = centroid.coordinates().getInfo()
var x = coors[0]
var y = coors[1];
Map.setCenter(x, y, 10);
// 详述日期
// Getting Temperatures for Every Month
var period = ['-01-01', '-12-01']; 
var years = [['1999', '2000'],
              ['2000', '2001'],
              ['2001', '2002'],
              ['2002', '2003'],
              ['2003', '2004'],
              ['2004', '2005'],
              ['2005', '2006'],
              ['2006', '2007'],
              ['2007', '2008'],
              ['2008', '2009'], 
              ['2009', '2010'], 
              ['2010', '2011'],
              ['2011', '2012'],
              ['2012', '2013'],
              ['2013', '2014'],
              ];
var add_period = function(year){
  var start_date = period[0]; 
  var end_date = period[1];
  return [year[0] + start_date, year[1] + end_date];
};
var concatenate_year_with_periods = function(years, period){
  return years.map(add_period);
};
var Dates = concatenate_year_with_periods(years, period);
/**********************************************************************
                              Landsat 7 
***********************************************************************/
var visualization = {
  bands: ['B4', 'B3', 'B2'],
  min: 0.0,
  max: 0.3,
};
var visualization_ = {
  bands: ['B4_median', 'B3_median', 'B2_median'],
  min: 0.0,
  max: 0.3,
  gamma: [0.95, 1.1, 1]
};
// 去云
var cloudMaskL7 = function(image) {
  var qa = image.select('BQA');
  var cloud = qa.bitwiseAnd(1 << 4)
                  .and(qa.bitwiseAnd(1 << 6))
                  .or(qa.bitwiseAnd(1 << 8));
  var mask2 = image.mask().reduce(ee.Reducer.min());
  return image
       //.select(['B3', 'B4'], ['Red', 'NIR'])
       .updateMask(cloud.not()).updateMask(mask2)
       .set('system:time_start', image.get('system:time_start'));
};
var dataset = ee.ImageCollection('LANDSAT/LE07/C01/T1_TOA')
    .filterDate('1999-01-01', '2020-12-31')
    .filterBounds(aoi)
    //.map(applyScaleFactors)
    .map(cloudMaskL7)
    .map(function(image){return image.clip(aoi)});
// 使用中位像素值创建合成物
var median_yearly_landsat_7 = function(start, end){
  var dataset_ =  dataset.filter(ee.Filter.date(start, end));
  var median_yearly = dataset_.reduce(ee.Reducer.median());
  return median_yearly;
};
var composite_name_list_l7 = ee.List([]);
var apply_monthly_composite = function(date_list){
    var start = date_list[0];
    var end = date_list[1]; 
    var output_name = start + "TO" + end + "_LANSAT_7";
    var composite = median_yearly_landsat_7(start, end);
    composite_name_list_l7 = composite_name_list_l7.add([composite, output_name]);
    Map.addLayer(composite, visualization_, output_name, false);
    Export.image.toDrive({
      image: composite,
      description: output_name,
      fileFormat: 'GeoTIFF',
      crs : 'EPSG:4326',
      folder : 'LANDSAT_LST_LAS_LOMAS',
      region: aoi
    });
    return 0; 
};
Dates.map(apply_monthly_composite); 
/******************************************************************
// Animation gif 
// 创建RGB可视化图像，作为动画框架使用。
/******************************************************************/
var text = require('users/gena/packages:text');
var annotated_collection_list = ee.List([])
var annotations = [//大比例尺，因为图像是整个世界的。使用较小的比例，否则超限
  {position: 'left', offset: '0.25%', margin: '0.25%', property: 'label', scale: 1.5} 
  ];
var create_annotated_collection = function(image_and_id) {
  var img = image_and_id[0];
  var image_id = image_and_id[1];
  console.log(img);
  console.log(image_id);
  var img_out = img.visualize(visualization_)
  .clip(aoi)//.paint(municipalities, 'FF0000', 2)
  .set({'label': image_id});
  Map.addLayer(img_out);
  var annotated = text.annotateImage(img_out, {}, Bayern, annotations);
  annotated_collection.add(annotated);
  return 0;
};
var municipalities_geom = geometry;
var n = composite_name_list_l7.size().getInfo();
print(n);
for (var i = 0; i < n; i++) {
    var img_info = ee.List(composite_name_list_l7.get(i));
    print(img_info);
    var img = ee.Image(img_info.get(0));
    var img_id = ee.String(img_info.get(1));
    var year = ee.String(ee.List(img_id.split("-").get(0)));
    var month = ee.String(ee.List(img_id.split("-").get(1)));
    var img_id_ = year.getInfo() + "_" + month.getInfo();
    var img_out = img.visualize(visualization_)
      .set({'label': img_id_});
    var annotated = text.annotateImage(img_out, {}, municipalities_geom, annotations);
    Map.addLayer(annotated);
    var annotated_collection_list = annotated_collection_list.add(annotated)
}
var annotated_col = ee.ImageCollection(annotated_collection_list)
// 定义GIF的可视化参数。
var gifParams = {
  'region': geometry,
  'dimensions': 254,
  'crs': 'EPSG:32632',
  'framesPerSecond': 1
};
// 打印GIF的URL到控制台。
print(annotated_col.getVideoThumbURL(gifParams));
// 在控制台中渲染GIF动画。
print(ui.Thumbnail(annotated_col, gifParams));