朋友们好！本次我们对ERA5、FLDAS、CHIRPS和TerraClimate数据集的年均降水量进行了分析。大家只需根据自己的研究区域和时间段进行相应调整，即可获取所需的数据。希望这对大家的研究有所帮助！
一、GEE代码
var ET_region = table;var collection1 = ee.ImageCollection("ECMWF/ERA5_LAND/MONTHLY_AGGR").filterDate('1985-01-01', '2023-12-31').select('total_precipitation_sum');var collection3 = ee.ImageCollection("NASA/FLDAS/NOAH01/C/GL/M/V001").filterDate('1985-01-01', '2023-12-31').select('Rainf_f_tavg');var collection4 = ee.ImageCollection("UCSB-CHG/CHIRPS/DAILY").filterDate('1985-01-01', '2023-12-31').select('precipitation');var collection5 = ee.ImageCollection("IDAHO_EPSCOR/TERRACLIMATE").filterDate('1985-01-01', '2023-12-31').select('pr');function getYearlyData(collection, datasetName, bandName, factor) {var range = collection.reduceColumns(ee.Reducer.minMax(), ['system:time_start']);var diff = ee.Date(range.get('max')).difference(ee.Date(range.get('min')), 'year');var yearlyData = ee.List.sequence(0, diff).map(function(n) {var start = ee.Date(range.get('min')).advance(n, 'year');var end = start.advance(1, 'year');var yearlyImage = collection.filterDate(start, end).sum().multiply(factor).set('system:time_start', start);var year = ee.Date(yearlyImage.get('system:time_start')).get('year');var meanValue = yearlyImage.reduceRegion({reducer: ee.Reducer.mean(),geometry: ET_region,scale: 50000}).get(bandName);return ee.Feature(null, {'Year': year,'Dataset': datasetName,'Precipitation (mm)': meanValue});});return ee.List(yearlyData);}var yearlyERA5 = getYearlyData(collection1, 'ERA5', 'total_precipitation_sum', 1000);var yearlyFLDAS = getYearlyData(collection3, 'FLDAS', 'Rainf_f_tavg', 24 * 60 * 60 * 30);var yearlyCHIRPS = getYearlyData(collection4, 'CHIRPS', 'precipitation', 1);var yearlyTerraClimate = getYearlyData(collection5, 'TerraClimate', 'pr', 1);var allYearlyData = ee.List(yearlyERA5).cat(yearlyFLDAS).cat(yearlyCHIRPS).cat(yearlyTerraClimate);Export.table.toDrive({collection: ee.FeatureCollection(allYearlyData),description: 'YearlyPrecipitationData',fileFormat: 'CSV',});
二、成为会员
