Google Earth Engine（GEE）——全球土壤盐度数据集（1986-2016）

全球土壤盐度图（1986-2016）
该数据集包括1986、1992、2000、2002、2005、2009和2016年的全球土壤盐度层。这些地图是用一个随机森林分类器生成的，该分类器是用七个土壤属性图、热红外图像和WoSIS数据库中的ECe点数据进行训练的。所得地图的验证准确率在67-70%之间。根据我们的评估，受盐影响的土地总面积约为10亿公顷，并有明显的增长趋势。进一步的细节在一篇同行评议的期刊文章中提供（https://doi.org/10.1016/j.rse.2019.111260）。这个数据集的主要数据页可以在这里找到，还有VRT和tiff文件的链接。

文献：

Ivushkin, Konstantin, Harm Bartholomeus, Arnold K. Bregt, Alim Pulatov, Bas Kempen, and Luis De Sousa. "Global mapping of soil salinity change." Remote sensing of environment 231 (2019): 111260.

 代码：

var soil_salinity = ee.ImageCollection("projects/sat-io/open-datasets/global_soil_salinity");


var dataset = ee.ImageCollection('MODIS/006/MOD44W')
                  .filter(ee.Filter.date('2015-01-01', '2015-05-01'));
var waterMask = dataset.select('water_mask');

// set position of panel
var legend = ui.Panel({
  style: {
    position: 'bottom-left',
    padding: '8px 15px'
  }
});
 
// Create legend title
var legendTitle = ui.Label({
  value: 'Legend',
  style: {
    fontWeight: 'bold',
    fontSize: '18px',
    margin: '0 0 4px 0',
    padding: '0'
    }
});
 
// Add the title to the panel
legend.add(legendTitle);
 
// Creates and styles 1 row of the legend.
var makeRow = function(color, name) {
 
      // Create the label that is actually the colored box.
      var colorBox = ui.Label({
        style: {
          backgroundColor: '#' + color,
          // Use padding to give the box height and width.
          padding: '8px',
          margin: '0 0 4px 0'
        }
      });
 
      // Create the label filled with the description text.
      var description = ui.Label({
        value: name,
        style: {margin: '0 0 4px 6px'}
      });
 
      // return the panel
      return ui.Panel({
        widgets: [colorBox, description],
        layout: ui.Panel.Layout.Flow('horizontal')
      });
};
 
//  Palette with the colors
var palette =['00FF00', 'FFFF00','FFA500','FF0000', '8B0000'];
 
// name of the legend
var names = ['Non saline','Slightly saline','Moderately saline','Highly saline','Extremely saline'];
 
// Add color and and names
for (var i = 0; i < 5; i++) {
  legend.add(makeRow(palette[i], names[i]));
  }  
 
// add legend to map (alternatively you can also print the legend to the console)
Map.add(legend);
Map.addLayer(soil_salinity.median().updateMask(waterMask.mosaic().eq(0)),{'min':0,'max':5,'palette':palette},'Soil salinity')

代码链接：https://code.earthengine.google.com/?scriptPath=users/sat-io/awesome-gee-catalog-examples:soil-properties/GLOBAL-SOIL-SALINITY

License¶

This work is licensed under the Creative Commons Attribution 4.0 International License (Creative Commons — Attribution 4.0 International — CC BY 4.0). Users are free to use, copy, distribute, transmit, and adapt the work for commercial and non-commercial purposes, without restriction, as long as clear attribution of the source is provided.

Created by: Ivushkin et al

Curated by: Samapriya Roy

Keywords: : salinity, digital soil mapping, electrical conductivity, global map, soilgrids, landsat, thermal, salinisation

Last updated: 2021-11-25