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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| /** | ||
| * @fileoverview Earth Engine Developer's Guide examples | ||
| * from 'Earth Engine Algorithms' section. | ||
| */ | ||
|
|
||
| // placeholded imports | ||
| var dem = ee.Image('USGS/SRTMGL1_003'); | ||
| var collection1 = ee.ImageCollection('NOAA/DMSP-OLS/NIGHTTIME_LIGHTS'); | ||
|
|
||
| // dummy variables | ||
| var image1 = ee.Image(1); | ||
| var image2 = ee.Image(2); | ||
|
|
||
| // [START image_add_method] | ||
| var image3 = image1.add(image2); | ||
| // [END image_add_method] | ||
|
|
||
| // [START ee_algo] | ||
| var terrainImage = ee.Algorithms.Terrain(dem); | ||
| // [END ee_algo] | ||
|
|
||
| // [START user_function] | ||
| var myFunction = function(args) { | ||
| // do something | ||
| return something; | ||
| }; | ||
| // [END user_function] | ||
|
|
||
| // dummy function | ||
| var aFunction = function(image) { | ||
| return image; | ||
| }; | ||
|
|
||
| // [START collection_map] | ||
| var collection2 = collection1.map(aFunction); | ||
| // [END collection_map] |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| /** | ||
| * @fileoverview Earth Engine Developer's Guide examples | ||
| * from '"Hello world!" JavaScript' section | ||
| */ | ||
|
|
||
| // [START js_hello] | ||
| print('Hello world!'); | ||
| // [END js_hello] | ||
|
|
||
| // [START ee_hello] | ||
| print(ee.Image('LANDSAT/LC8_L1T/LC80440342014077LGN00')); | ||
| // [END ee_hello] |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| /** | ||
| * @fileoverview Earth Engine Developer's Guide examples | ||
| * from 'Adding data to the map' section | ||
| */ | ||
|
|
||
| // [START image_display] | ||
| var image = ee.Image('LANDSAT/LC8_L1T/LC80440342014077LGN00'); | ||
| Map.centerObject(image, 9); | ||
| Map.addLayer(image); | ||
| // [END image_display] | ||
|
|
||
| // [START image_visualization] | ||
| var image = ee.Image('LANDSAT/LC8_L1T/LC80440342014077LGN00'); | ||
| // define visualization parameters in an object literal | ||
| var vizParams = {bands: ['B5', 'B4', 'B3'], min: 5000, max: 15000, gamma: 1.3}; | ||
| Map.centerObject(image, 9); | ||
| Map.addLayer(image, vizParams, 'Landsat 8 false color'); | ||
| // [END image_visualization] | ||
|
|
||
| // [START fc_display] | ||
| var counties = ee.FeatureCollection('ft:1S4EB6319wWW2sWQDPhDvmSBIVrD3iEmCLYB7nMM'); | ||
| Map.addLayer(counties, {}, 'counties'); | ||
| // [END fc_display] |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| /** | ||
| * @fileoverview Earth Engine Developer's Guide examples | ||
| * from 'Finding ImageCollections and FeatureCollections' and | ||
| * 'Filtering and Sorting' sections | ||
| */ | ||
|
|
||
| // [START collection_load] | ||
| var collection = ee.ImageCollection('LANDSAT/LC8_L1T'); | ||
| // [END collection_load] | ||
| print(collection.first()); | ||
|
|
||
| // [START make_point] | ||
| var point = ee.Geometry.Point(-122.262, 37.8719); | ||
| // [END make_point] | ||
|
|
||
| // [START date_range] | ||
| var start = ee.Date('2014-06-01'); | ||
| var finish = ee.Date('2014-10-01'); | ||
| // [END date_range] | ||
|
|
||
| // [START filter_ic] | ||
| var filteredCollection = ee.ImageCollection('LANDSAT/LC8_L1T') | ||
| .filterBounds(point) | ||
| .filterDate(start, finish) | ||
| .sort('CLOUD_COVER', true); | ||
| // [END filter_ic] | ||
| print(filteredCollection); | ||
|
|
||
| // [START get_first] | ||
| var first = filteredCollection.first(); | ||
| // [END get_first] | ||
| print(first); | ||
|
|
||
| // [START filter_fc] | ||
| var featureCollection = ee.FeatureCollection('ft:1fRY18cjsHzDgGiJiS2nnpUU3v9JPDc2HNaR7Xk8'); | ||
| var filteredFC = featureCollection.filter(ee.Filter.eq('Name', 'California')); | ||
| Map.addLayer(filteredFC, {}, 'California'); | ||
| // [END filter_fc] |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| /** | ||
| * @fileoverview Earth Engine Developer's Guide examples | ||
| * from 'Band Math' and 'Masking' sections | ||
| */ | ||
|
|
||
| // [START band_math] | ||
| // function to get NDVI from Landsat 5 imagery | ||
| var getNDVI = function(image) { | ||
| return image.normalizedDifference(['B4', 'B3']); | ||
| }; | ||
|
|
||
| // two Landsat 5 images, 20 years apart | ||
| var image1 = ee.Image('LT5_L1T_TOA/LT50440341990155XXX03'); | ||
| var image2 = ee.Image('LT5_L1T_TOA/LT50440342010162EDC00'); | ||
|
|
||
| // compute NDVI from the scenes | ||
| var ndvi1 = getNDVI(image1); | ||
| var ndvi2 = getNDVI(image2); | ||
|
|
||
| // compute the difference in NDVI | ||
| var ndviDifference = ndvi2.subtract(ndvi1); | ||
| // [END band_math] | ||
|
|
||
| // [START masking] | ||
|
|
||
| // land mask from the SRTM DEM | ||
| var landMask = ee.Image('CGIAR/SRTM90_V4').mask(); | ||
| // combine the land mask with the original image mask | ||
| var mask = ndviDifference.mask().and(landMask); | ||
| // apply the mask to the NDVI difference | ||
| var maskedDifference = ndviDifference.mask(mask); | ||
|
|
||
| // display the masked result | ||
| var vizParams = {min: -0.5, max: 0.5, palette: ['FF0000', 'FFFFFF', '0000FF']}; | ||
| Map.setCenter(-122.2531, 37.6295, 9); | ||
| Map.addLayer(maskedDifference, vizParams, 'NDVI difference'); | ||
| // [END masking] |
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