北美干旱监测 (NADM)数据集

// Read in Image Collection and mosaic to single image
var nadm_ic = ee.ImageCollection('projects/climate-engine/nadm/monthly')
var nadm_i = nadm_ic.first()
// Print image to see bands
print(nadm_i)
// Visualize a single image
var nadm_palette = ["#ffffff", "#ffff00", "#fcd37f", "#ffaa00", "#e60000", "#730000"]
Map.addLayer(nadm_i, {min:-1, max:4, palette: nadm_palette}, 'nadm_i')
// Read in Image Collection and mosaic to single image
var nadm_ic = ee.ImageCollection('projects/climate-engine/nadm/monthly')
var nadm_i = ee.Image(nadm_ic.sort('system:time_start',false).first())
// Print image to see bands
print(nadm_i)
// Visualize a single image
var nadm_palette = ["#ffffff", "#ffff00", "#fcd37f", "#ffaa00", "#e60000", "#730000"]
// Define a dictionary which will be used to make legend and visualize image on map
var dict = {
  "names": [
    "No drought or wet",
    "Abnormally Dry",
    "Moderate Drought",
    "Severe Drought",
    "Extreme Drought",
    "Exceptional Drought",
  ],
  "colors": [
    "#ffffff",
    "#FFFF00", 
    "#FCD37F", 
    "#FFAA00",
    "#E60000", 
    "#730000"
  ]};
// Create a panel to hold the legend widget
var legend = ui.Panel({
  style: {
    position: 'bottom-left',
    padding: '8px 15px'
  }
});
// Function to generate the legend
function addCategoricalLegend(panel, dict, title) {
  
  // Create and add the legend title.
  var legendTitle = ui.Label({
    value: title,
    style: {
      fontWeight: 'bold',
      fontSize: '18px',
      margin: '0 0 4px 0',
      padding: '0'
    }
  });
  panel.add(legendTitle);
  
  var loading = ui.Label('Loading legend...', {margin: '2px 0 4px 0'});
  panel.add(loading);
  
  // 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 ui.Panel({
      widgets: [colorBox, description],
      layout: ui.Panel.Layout.Flow('horizontal')
    });
  };
  
  // Get the list of palette colors and class names from the image.
  var palette = dict['colors'];
  var names = dict['names'];
  loading.style().set('shown', false);
  
  for (var i = 0; i < names.length; i++) {
    panel.add(makeRow(palette[i], names[i]));
  }
  
  Map.add(panel);
  
}
/*
  // Display map and legend ///
*/
// Add the legend to the map
addCategoricalLegend(legend, dict, 'North America Drought Monitor(NADM) Monthly');
Map.addLayer(nadm_i, {min:-1, max:4, palette: nadm_palette}, 'NADM '+ee.Date(nadm_i.get('system:time_start')).format('YYYY-MM-dd').getInfo())