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目录
1 完整代码
2 运行结果
本文使用Copernicus Sentinel-5P卫星的NRTI L3数据集，监测研究区2019-2024年的CO、NO₂、SO₂、O₃和HCHO的月度变化，单位均为mol/m^2。
1 完整代码
var roi = table;var time_start = '2019-01-01';
var time_end = '2024-12-31';var co = ee.ImageCollection('COPERNICUS/S5P/NRTI/L3_CO').select('CO_column_number_density').filterDate(time_start, time_end).filterBounds(roi);var no2 = ee.ImageCollection('COPERNICUS/S5P/NRTI/L3_NO2').select('NO2_column_number_density').filterDate(time_start, time_end).filterBounds(roi);var so2 = ee.ImageCollection('COPERNICUS/S5P/NRTI/L3_SO2').select('SO2_column_number_density').filterDate(time_start, time_end).filterBounds(roi);var o3 = ee.ImageCollection('COPERNICUS/S5P/NRTI/L3_O3').select('O3_column_number_density').filterDate(time_start, time_end).filterBounds(roi);var hcho = ee.ImageCollection('COPERNICUS/S5P/NRTI/L3_HCHO').select('tropospheric_HCHO_column_number_density').filterDate(time_start, time_end).filterBounds(roi);var months = ee.List.sequence(1, 12);
var years = ee.List.sequence(2019, 2024);function monthlyAverage(imgCol, bandName) {var monthlyMeans = years.map(function(year) {return months.map(function(month) {var start = ee.Date.fromYMD(year, month, 1);var end = start.advance(1, 'month');var monthlyCol = imgCol.filterDate(start, end);var meanImg = monthlyCol.mean().set({'year': year,'month': month,'system:time_start': start.millis()});return meanImg;});}).flatten();return ee.ImageCollection(monthlyMeans);
}var coMonthly = monthlyAverage(co, 'CO_column_number_density');
var no2Monthly = monthlyAverage(no2, 'NO2_column_number_density');
var so2Monthly = monthlyAverage(so2, 'SO2_column_number_density');
var o3Monthly = monthlyAverage(o3, 'O3_column_number_density');
var hchoMonthly = monthlyAverage(hcho, 'tropospheric_HCHO_column_number_density');function chartTimeSeries(imageCollection, bandName, title, yLabel) {var chart = ui.Chart.image.series({imageCollection: imageCollection.select(bandName),region: roi,reducer: ee.Reducer.mean(),scale: 10000}).setOptions({title: title,hAxis: { title: 'Time', format: 'YYYY-MM' },vAxis: { title: yLabel },lineWidth: 2,pointSize: 3,series: {0: { color: 'red' }}});return chart;
}var coChart = chartTimeSeries(coMonthly, 'CO_column_number_density', 'CO Monthly Variation (2019-2024)', 'CO Density');
var no2Chart = chartTimeSeries(no2Monthly, 'NO2_column_number_density', 'NO₂ Monthly Variation (2019-2024)', 'NO₂ Density');
var so2Chart = chartTimeSeries(so2Monthly, 'SO2_column_number_density', 'SO₂ Monthly Variation (2019-2024)', 'SO₂ Density');
var o3Chart = chartTimeSeries(o3Monthly, 'O3_column_number_density', 'O₃ Monthly Variation (2019-2024)', 'O₃ Density');
var hchoChart = chartTimeSeries(hchoMonthly, 'tropospheric_HCHO_column_number_density', 'HCHO Monthly Variation (2019-2024)', 'HCHO Density');print(coChart);
print(no2Chart);
print(so2Chart);
print(o3Chart);
print(hchoChart);
2 运行结果
