[Google Earth Engine snippets] #google_earth_engine

gee-filter.js

// Examples of using filters with collections
// See https://groups.google.com/forum/#!topic/google-earth-engine-developers/J50mCM-LEMk
// for context

// Set up two constant images with 'a', 'b' and 'c' properties
var im1 = ee.Image.constant(0).set({
  a: [1,2,3], b: 4, c: 4
});
var im2 = ee.Image.constant(0).set({
  a: [4,5,6], b: 4, c: 5
});

// Create a collection of the two images
var coll = ee.ImageCollection([im1, im2]);

// Equals filters
var f1 = ee.Filter.equals('a', [1,2,3]);
print(coll.filter(f1)); // returns im1

var f2 = ee.Filter.equals('b', 4);
print(coll.filter(f2)); // returns both im1, im2

var f3 = ee.Filter.equals('b', null, 'c');
print(coll.filter(f3)); // returns im1

// List contains filters
var f4 = ee.Filter.listContains('a', 3);
print(coll.filter(f4)); // returns im1

var f5 = ee.Filter.listContains('a', null, 'b');
print(coll.filter(f5)); // returns im2

var f6 = ee.Filter.listContains(null, null, 'c', [5, 6]);
print(coll.filter(f6)); // returns im2

gee-raster-sources.js

// Landsat collections

// TOA (top of atmosphere)
var L4_TOA = ee.ImageCollection('LANDSAT/LT4_L1T_TOA');
var L5_TOA = ee.ImageCollection('LANDSAT/LT5_L1T_TOA');
var L7_TOA = ee.ImageCollection('LANDSAT/LE7_L1T_TOA');
var L8_TOA = ee.ImageCollection('LANDSAT/LC8_L1T_TOA');

// SR (surface reflectance)
var L4_SR = ee.ImageCollection('LANDSAT/LT4_SR');
var L5_SR = ee.ImageCollection('LANDSAT/LT5_SR');
var L7_SR = ee.ImageCollection('LANDSAT/LE7_SR');
var L8_SR = ee.ImageCollection('LANDSAT/LC8_SR');

// Other data sources
// Elevation
var NED = ee.Image('USGS/NED'); // NAD83, 1/3 arc second (~10m)
var SRTM30 = ee.Image('USGS/SRTMGL1_003'); // WGS84, 30m
var SRTM90 = ee.Image('CGIAR/SRTM90_V4'); // WGS84, 90m (filled SRTM30)

// NAIP
var NAIP = ee.ImageCollection("USDA/NAIP/DOQQ");