一、数据说明
Dynamic World V1 是 Google 与世界资源研究所联合推出的全球10米分辨率近实时（NRT）土地覆盖/土地利用（LULC）数据集，覆盖时间范围为 2015 年 6 月 27 日至今，基于 Sentinel-2 L1C 数据生成，更新频率为 2-5 天（视纬度而定）。数据采用 S2 云概率、云位移指数（CDI）和方向距离变换（DDT）等方法去除云和云影，提供九类土地覆盖的分类概率及最高概率类别的标签信息（label 波段）。
二、分类体系
三、GEE代码
此代码适用于合成并导出年度的土地利用数据，各位同学可以根据自己的更换研究区和时间段。
//公众号：GIS遥感数据处理应用//https://code.earthengine.google.com/ee01f5fe86bbab2e2bbfbc454a38b399var roi = table;var startYear = 2020;var endYear = 2024;var dw = ee.ImageCollection('GOOGLE/DYNAMICWORLD/V1');var dwVisParams = {min: 0,max: 8,palette: ['#419BDF', '#397D49', '#88B053', '#7A87C6', '#E49635', '#DFC35A', '#C4281B', '#A59B8F', '#B39FE1']};function getAnnualComposite(year) {var startDate = ee.Date.fromYMD(year, 1, 1);var endDate = startDate.advance(1, 'year');var annualImages = dw.filterDate(startDate, endDate).filterBounds(roi);var annualComposite = annualImages.mode().select('label').clip(roi).set('year', year);print(annualComposite)Export.image.toDrive({image: annualComposite,description: 'Dynamic_World_' + year,folder: 'Dynamic_World_Export',fileNamePrefix: 'Dynamic_World_' + year,scale: 10,region: roi,maxPixels: 1e13});return annualComposite;}var annualComposites = [];for (var year = startYear; year <= endYear; year++) {var composite = getAnnualComposite(year);annualComposites.push(composite);}var lastYearImage = annualComposites[annualComposites.length - 1];Map.addLayer(lastYearImage, dwVisParams, 'Dynamic World 2023');Map.centerObject(roi);
四、成为会员
