Code Editor (JavaScript)
// The goal is to create a series of thumbnail images for an elevation dataset
// with different backgrounds. The background layers and image visualization
// are previewed in the Code Editor map before creating the thumbnails.
// Define a black background.
var blackBg = ee.Image.rgb(0, 0, 0)
.visualize({min: 0, max: 255});
Map.addLayer(blackBg, {}, 'Black background');
// Define a water / land background.
var waterLandBg = ee.Image('NOAA/NGDC/ETOPO1').select('bedrock').gt(0.0)
.visualize({palette: ['cadetblue', 'lightgray']});
Map.addLayer(waterLandBg, {}, 'Water / land background');
// A map display of a digital elevation model (DEM).
var image = ee.Image('AU/GA/DEM_1SEC/v10/DEM-S').select('elevation')
.visualize({
min: -10.0,
max: 1300.0,
palette: [
'3ae237', 'b5e22e', 'd6e21f', 'fff705', 'ffd611', 'ffb613', 'ff8b13',
'ff6e08', 'ff500d', 'ff0000', 'de0101', 'c21301', '0602ff', '235cb1',
'307ef3', '269db1', '30c8e2', '32d3ef', '3be285', '3ff38f', '86e26f'
],
});
Map.addLayer(image, {}, 'Elevation');
// Set the center of the map.
var lon = 133.95;
var lat = -24.69;
Map.setCenter(lon, lat, 4);
// Set the basic parameters for the thumbnail.
// Half-width of the thumbnail in degrees in EPSG:3857.
var delta = 22;
// Width and Height of the Thumbail image.
var pixels = 256;
var areaOfInterest = ee.Geometry.Rectangle(
[lon - delta, lat - delta, lon + delta, lat + delta], null, false);
var parameters = {
dimensions: [pixels, pixels],
region: areaOfInterest,
crs: 'EPSG:3857',
format: 'png'};
// Create a thumbnail with no background fill.
// Masked pixels will be transparent.
print(ui.Thumbnail({image: image, params: parameters}));
// Use a black background to replace masked image pixels.
var imageWithBlackBg = blackBg.blend(image);
print(ui.Thumbnail({
image: imageWithBlackBg, params: parameters}));
// Use the water / land background to replace masked image pixels.
var imageWithWaterLandBg = waterLandBg.blend(image);
print(ui.Thumbnail({
image: imageWithWaterLandBg, params: parameters}));