GEE数据集——PML_V2 0.1.7：蒸散量与初级生产总值（GPP）耦合

Penman-Monteith-Leuning蒸散V2（PML_V2）产品包括蒸散（ET），其三个组成部分，以及2002-2017年期间500米和8天分辨率的初级产品总产（GPP），空间范围为-60°S至90°N。PML_V2产品的主要优点是：

通过冠层电导对蒸腾作用和GPP的耦合估计（Gan等人，2018;张等， 2019）
将ET划分为三个部分：来自植被的蒸腾作用，来自土壤的直接蒸发以及来自植被的截获降雨的蒸发（Zhang等人，2016）。

PML_V2产品在全球95个通量位点的观测中表现良好，并且与水和生态科学界广泛使用的主要最先进的ET和GPP产品相似或明显更好（Zhang等人，2019）。

Penman-Monteith-Leuning Evapotranspiration V2 (PML_V2) products include evapotranspiration (ET), its three components, and gross primary product (GPP) at 500m and 8-day resolution during 2002-2017 and with spatial range from -60°S to 90°N. The major advantages of the PML_V2 products are:

coupled estimates of transpiration and GPP via canopy conductance (Gan et al., 2018; Zhang et al., 2019)
partitioning ET into three components: transpiration from vegetation, direct evaporation from the soil and vaporization of intercepted rainfall from vegetation (Zhang et al., 2016).

The PML_V2 products perform well against observations at 95 flux sites across globe, and are similar to or noticeably better than major state-of-the-art ET and GPP products widely used by water and ecology science communities (Zhang et al., 2019).

Dataset Availability

2002-07-04T00:00:00Z–2020-12-26T00:00:00

Dataset Provider

PML_V2

Earth Engine Snippet

ee.ImageCollection("CAS/IGSNRR/PML/V2_v017")

Bands

代码

var dataset = ee.ImageCollection('CAS/IGSNRR/PML/V2_v017');

var visualization = {
  bands: ['GPP'],
  min: 0.0,
  max: 9.0,
  palette: [
    'a50026', 'd73027', 'f46d43', 'fdae61', 'fee08b', 'ffffbf',
    'd9ef8b', 'a6d96a', '66bd63', '1a9850', '006837',
  ]
};

Map.setCenter(0.0, 15.0, 2);

Map.addLayer(
    dataset, visualization, 'PML_V2 0.1.7 Gross Primary Product (GPP)');

展示

下载示例代码

//研究区
var roi = ee.FeatureCollection("users/sihaixiang/shandong").geometry(); 
 
//批量下载函数
function exportImage(image, roi, fileName) {  
    Export.image.toDrive({  
       image: image,  
       description: "Drive-image-"+fileName,  
       fileNamePrefix: fileName+'_PML',  //文件命名
       folder: "PML V2",  //保存的文件夹
       scale: 500,  //分辨率
       region: roi,  //研究区
       maxPixels: 1e13,  //最大像元素，默认就好
       crs: "EPSG:4326"  //设置投影
   });  
 } 
 
//加载数据集
//PML_V2：耦合蒸散量与初级生产总值,8天/幅,分辨率为500米
var data = ee.ImageCollection("CAS/IGSNRR/PML/V2");
Map.centerObject(roi, 4);  //图层显示
 
//筛选数据
var data_selected = data.filterBounds(roi) 
               .filterDate("2016-7-28", "2016-9-30")
               .select("ET_water")  //'GPP' 'Ec' 'Es' 'Ei' 'ET_water'
               
print("data_selected", data_selected); 
 
//生成列表，迭代下载
var indexList = data_selected.reduceColumns(ee.Reducer.toList(), ["system:index"]).get("list"); 
print("indexList", indexList);
indexList.evaluate(function(indexs) { 
    for (var i=0; i<indexs.length; i++) {  
        var image = data_selected.filter(ee.Filter.eq("system:index", indexs[i]))
              .first()
              
              .toInt16()  //设置数据类型 
              .clip (roi);   //裁剪数据
        exportImage(image, roi, indexs[i]);  //保存图像至Google网盘
   }
 });

GEE数据集——PML_V2 0.1.7： 蒸散量与初级生产总值（GPP）耦合

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GEE数据集——PML_V2 0.1.7：蒸散量与初级生产总值（GPP）耦合