refactor(Weather_download): 重构天气数据下载脚本并添加导出函数.
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@ -10,14 +10,15 @@
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*/
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// 加载研究区域和影像
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var region_name = "应城市";
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var region_name_en = "Yingcheng";
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var region = Yingcheng;
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var crs = "EPSG:4526";
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// var region_name = "保康县";
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// var region_name_en = "Baokang";
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// var region = Baokang;
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// var crs = "EPSG:4525";
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// var region_name = "应城市";
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// var region_name_en = "Yingcheng";
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// var region = Yingcheng;
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// var target_crs = "EPSG:4526";
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var region_name = "保康县";
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var region_name_en = "Baokang";
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var region = Baokang;
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var target_crs = "EPSG:4525";
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var target_res = 30;
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var start_year = 2021;
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var end_year = 2025;
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var start_date = start_year + "-01-01";
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@ -46,7 +47,7 @@ function kelvinToCelsius(image) {
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// 加载 ERA5-Land 数据
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var ERA5dataset = ee.ImageCollection("ECMWF/ERA5_LAND/MONTHLY_AGGR")
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.filter(common_filter)
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.select(ERA5Bands, commonBands)
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.select(ERA5Bands, commonBands);
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print(start_date + " - " + end_date + " ERA5-Land dataset", ERA5dataset);
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var ERA5Tempdataset = ERA5dataset.select("temperature").map(kelvinToCelsius);
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var ERA5Raindataset = ERA5dataset.select("total_precipitation_sum");
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@ -72,24 +73,24 @@ if (start_year == end_year) {
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} else {
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var year_str = start_year + "-" + end_year;
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}
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print(year_str + " Annual Mean ERA5-Land temperature dataset", yearlyTemp);
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print(year_str + " Annual Mean ERA5-Land rainfall dataset", yearlyRain);
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print(year_str + " Annual Mean ERA5-Land Temperature dataset", yearlyTemp);
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print(year_str + " Annual Mean ERA5-Land Precipitation dataset", yearlyRain);
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// 合成处理后会丢失投影信息, 需要重新设置投影
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var proj = ERA5dataset.first().select(1).projection();
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var annual_mean_temperature = ee.Image(yearlyTemp.mean()).setDefaultProjection(proj);
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print(year_str + " Annual Mean ERA5-Land temperature Histogram", ui.Chart.image.histogram(annual_mean_temperature, region, 10000, 258));
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print(year_str + " Annual Mean ERA5-Land Temperature Histogram", ui.Chart.image.histogram(annual_mean_temperature, region, 10000, 258));
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var annual_mean_rainfall = ee.Image(yearlyRain.mean()).setDefaultProjection(proj);
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print(year_str + " Annual Mean ERA5-Land rainfall Histogram", ui.Chart.image.histogram(annual_mean_rainfall, region, 10000, 258));
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var annual_mean_precipitation = ee.Image(yearlyRain.mean()).setDefaultProjection(proj);
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print(year_str + " Annual Mean ERA5-Land Precipitation Histogram", ui.Chart.image.histogram(annual_mean_precipitation, region, 10000, 258));
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var annual_mean_temp_1km = annual_mean_temperature.clip(bounds).resample("bicubic").reproject({
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crs: proj,
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scale: 1000,
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crs: "EPSG:4526",
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scale: 30,
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});
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var annual_mean_rainfall_1km = annual_mean_rainfall.clip(bounds).resample("bicubic").reproject({
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crs: proj,
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scale: 1000,
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var annual_mean_precipitation_1km = annual_mean_precipitation.clip(bounds).resample("bicubic").reproject({
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crs: "EPSG:4526",
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scale: 30,
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});
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var temperature_vis = {
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@ -119,45 +120,51 @@ var styling = {
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};
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Map.centerObject(region, 7);
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Map.addLayer(annual_mean_temperature, temperature_vis, year_str + " ERA5-Land Annual Mean temperature 0.1 degree");
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Map.addLayer(annual_mean_rainfall, precipitation_vis, year_str + " ERA5-Land Annual Mean precipitation 0.1 degree");
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Map.addLayer(annual_mean_temp_1km, temperature_vis, year_str + " ERA5-Land Annual Mean temperature 1km");
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Map.addLayer(annual_mean_rainfall_1km, precipitation_vis, year_str + " ERA5-Land Annual Mean precipitation 1km");
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Map.addLayer(annual_mean_temperature, temperature_vis, year_str + " Annual Mean Temperature 0.1 degree");
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Map.addLayer(annual_mean_precipitation, precipitation_vis, year_str + " Annual Mean Precipitation 0.1 degree");
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Map.addLayer(annual_mean_temp_1km, temperature_vis, year_str + " Annual Mean Temperature " + target_res + "m");
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Map.addLayer(annual_mean_precipitation_1km, precipitation_vis, year_str + " Annual Mean Precipitation " + target_res + "m");
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Map.addLayer(region.style(styling), {}, region_name);
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// 导出合并后的影像
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// 明确设置数据类型为Float32, 否则默认类型为Float64, 会占用更多内存
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// 并对缺失值进行填充, 否则默认为nan不便于后续本地处理
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var processed_temp_img = annual_mean_temperature.toFloat().unmask(-9999.0);
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print("Start exporting " + year_str + "Yearly Mean ERA5-Land temperature image (" + crs + ")", processed_temp_img);
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Export.image.toDrive({
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image: processed_temp_img,
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description: region_name_en + "_ERA5_Temperature_" + year_str + "_1km",
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folder: "Weather",
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region: region, // 添加后会自动裁剪
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scale: 1000,
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crs: crs,
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maxPixels: 1e13, // GEE 最多支持 1e8 像素, 当超过时会自动分块
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fileFormat: "GeoTIFF",
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// 导出COG云优化的GeoTIFF影像, 并明确设置缺失值为-9999.0
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formatOptions: {
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cloudOptimized: true,
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noData: -9999.0,
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},
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});
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function exportCOG(image, description, folder, region, scale, crs) {
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image = image.toFloat().unmask(-9999.0);
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// 默认为 EPSG:4526 投影
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crs = crs || "EPSG:4526";
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Export.image.toDrive({
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image: image,
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description: description,
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folder: folder,
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region: region, // 添加后会自动裁剪
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scale: scale,
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crs: crs,
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maxPixels: 1e13, // GEE 最多支持 1e8 像素, 当超过时会自动分块
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fileFormat: "GeoTIFF",
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// 导出COG云优化的GeoTIFF影像, 并明确设置缺失值为-9999.0
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formatOptions: {
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cloudOptimized: true,
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noData: -9999.0,
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},
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});
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}
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var processed_rain_img = annual_mean_rainfall.toFloat().unmask(-9999.0);
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Export.image.toDrive({
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image: processed_rain_img,
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description: region_name_en + "_ERA5_Precipitation_" + year_str + "_1km",
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folder: "Weather",
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region: region,
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scale: 1000,
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crs: crs,
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maxPixels: 1e13,
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fileFormat: "GeoTIFF",
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formatOptions: {
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cloudOptimized: true,
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noData: -9999.0,
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},
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});
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print("Start exporting " + year_str + " Yearly Mean ERA5-Land Temperature (" + target_crs + " " + target_res + "m)", annual_mean_temperature);
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exportCOG(
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annual_mean_temperature,
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region_name_en + "_ERA5_Temperature_" + year_str + "_" + target_res + "m",
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"Temperature",
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region,
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target_res,
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target_crs
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);
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print("Start exporting " + year_str + " Yearly Mean ERA5-Land Precipitation (" + target_crs + " " + target_res + "m)", annual_mean_precipitation);
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exportCOG(
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annual_mean_precipitation,
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region_name_en + "_ERA5_Precipitation_" + year_str + "_" + target_res + "m",
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"Precipitation",
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region,
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target_res,
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target_crs
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);
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