在Google Earth Engine (GEE)中创建条形图，其中包含每年的陆地卫星图像数量

var ee = require('users/google/earthengine:ee');
var landsat8 = ee.ImageCollection('LANDSAT/LC08/C01/T1');

var roi = ee.Geometry.Point(lon, lat); // 使用经纬度定义一个点作为ROI

var filtered = landsat8.filterBounds(roi)
                      .filterDate('YYYY-MM-DD', 'YYYY-MM-DD');

var count = filtered.reduce(ee.Reducer.count());

var chart = ui.Chart.image.doySeriesByYear({
  imageCollection: count,
  bandName: 'system:time_start',
  region: roi,
  regionReducer: ee.Reducer.sum(),
  scale: 30,
  yearReducer: ee.Reducer.count(),
  startDay: 1,
  endDay: 365
});

Map.addLayer(chart);