如何在Google Earth Engine 中累计CHIRPS 每天提供的每日降雨量？

Question

我想把《CHIRPS Daily》提供的GoogleEarth Engine在一个ROI和规定时间段内的每日降水量累加起来，得到如图这样的图表1（时间步长为 1 天）。

你有什么建议吗？提前谢谢你:)

Answer 1

这是code of CHIRPS daily precipitation Chart

// Select Dates
var startDate = '2021-06-01'
var endDate = '2021-09-01'

// Select Band (precipitation in case of CHIRPS dataset)
var selected_band = 'precipitation'

// create an Image collection
var dataset = ee.ImageCollection('UCSB-CHG/CHIRPS/DAILY')
                .filterBounds(Sonipat)
                .filter(ee.Filter.date(startDate, endDate))
                .select(selected_band)

// Check the count of days for which you want to extract the data              
var count = dataset.size();
print("image collection count between selected dates is :", count);

// check the Cumulative rainfall of the region of interest during that period
// an Image will also be displayed which will confirm your Area of Interest

var cumulativeRainfallImage = dataset.sum().clip(Sonipat);
print(cumulativeRainfallImage );

var precipitationVis = {
  min: 1.0,
  max: 17.0,
  palette: ['001137', '0aab1e', 'e7eb05', 'ff4a2d', 'e90000'],
};

Map.setCenter(76, 30, 7);
Map.addLayer(cumulativeRainfallImage , precipitationVis, 'Precipitation');

// Set some Vector Properties to see your shapefile/vector layer

var shown = true; // true or false, 1 or 0 
var opacity = 0.8; // number [0-1]
var nameLayer = 'Sonipat'; // string
var visParams = {color: 'Black'}; // dictionary: 
Map.addLayer(Sonipat, visParams, nameLayer, shown, opacity);

// Define the chart properties and see the output in the console.
var chart =
    ui.Chart.image
        .seriesByRegion({
          imageCollection: dataset,
          band: selected_band,
          regions: Sonipat,
          reducer: ee.Reducer.mean(),
          scale: 5000,
          seriesProperty: 'DISTRICT',
          xProperty: 'system:time_start'
        })
        .setOptions({
          title: 'Daily CHIRPS Rainfall',
          hAxis: {title: 'Date', titleTextStyle: {italic: false, bold: true}},
          vAxis: {
            title: 'Rainfall (mm)',
            titleTextStyle: {italic: false, bold: true}
          },
          lineWidth: 5,
          colors: ['CE7E45'],
        });
print(chart);

图像将在控制台的右侧面板中生成，

点击右上角的箭头图标后，

您将被重定向到另一个 window，您可以在其中下载 CSV，并稍后累积，

否则将无法获取每日时间步长的图表。

如何在Google Earth Engine 中累计CHIRPS 每天提供的每日降雨量？

How to cumulate the daily rainfall provided by CHIRPS daily in Google Earth Engine?

javascript

google-earth-plugin

cumulative-sum

google-earth-engine