Google Earth Engine（GEE）统计制图

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生态遥感_才 2022-08-08 16:17:33 博主文章分类：笔记 ©著作权

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今天来简单分享下如何在Google Earth Engine中制作时序性的折线图和柱状图，以MODIS/006/MOD13Q1为数据源，选取NDVI来统计制图。
实现代码如下：

//以山西省为研究区
var roi = ee.FeatureCollection("users/lilei655123/shanxi");
Map.centerObject(roi,7) 
var styling = {color:"red",fillColor:"00000000"};
Map.addLayer(roi.style(styling),{},"geometry")

//选择数据源
var collection = ee.ImageCollection('MODIS/006/MOD13Q1')
                  .filterBounds(roi)
                  .filterDate('2020-01-01','2020-12-31')//筛选日期
                  .select('NDVI')
                  .map(function(image){
                    return image.multiply(0.0001)                
                    .copyProperties(image, image.propertyNames());
                  });
//LineChart折线图
var chart1 = ui.Chart.image.seriesByRegion({imageCollection: collection,
                                regions: roi,
                                reducer: ee.Reducer.median(),//统计中值
                                band: 'NDVI',
                                scale: 250,
                                xProperty: 'system:time_start',
                                seriesProperty: 'label'});
chart1.setChartType('LineChart');
print(chart1);
//ColumnChart柱形图
var chart2 = ui.Chart.image.seriesByRegion({imageCollection: collection,
                                regions: roi,
                                reducer: ee.Reducer.mean(),//统计均值
                                band: 'NDVI',
                                scale: 250,
                                xProperty: 'system:time_start',
                                seriesProperty: 'label'});
chart2.setChartType('ColumnChart');
print(chart2);
var chart3 = ui.Chart.image.seriesByRegion({imageCollection: collection,
                                regions: roi,
                                reducer: ee.Reducer.max(),
                                band: 'NDVI',
                                scale: 250,
                                xProperty: 'system:time_start',
                                seriesProperty: 'label'});
chart3.setChartType('LineChart');
print(chart3);
var chart4 = ui.Chart.image.seriesByRegion({imageCollection: collection,
                                regions: roi,
                                reducer: ee.Reducer.min(),
                                band: 'NDVI',
                                scale: 250,
                                xProperty: 'system:time_start',
                                seriesProperty: 'label'});
chart1.setChartType('LineChart');
print(chart4);