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I need to layer stack two Landsat images from the dry season and the wet season.

Is the function 'composite' in earth engine going to give me the layer stacking?

  • By Earth Engine do you mean Google Earth Engine or something else? – PolyGeo Feb 14 '17 at 19:44
  • in EarthEngine terminology a 'composite' is a single image. What you are looking for is either an 'Image Collection' or a 'Image' with multiple bands. What you use is solely dependent on what you plan to do with your image stack. I suggest you have a look into the official EarthEngine documentation since this and all of your previous questions are answered in there. – Kersten Feb 15 '17 at 9:04
  • Thanks Kersten. I have been reading the official Earth Engine documentation and its not very clear about Layerstacking as I understand it from ENVI or any other proprietary Image analysis software. – Pamela Ochungo Feb 15 '17 at 14:40
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The ee.Image.addBands() method can be used to "stack" bands from two Landsat images. For example:

var wet = ee.Image('LANDSAT/LC8_L1T/LC80440342017005LGN00');
var dry = ee.Image('LANDSAT/LC8_L1T/LC80440342016195LGN00');
var stacked_composite = wet.addBands(dry);
print('stacked_composite bands', stacked_composite.bandNames());

Note that the resulting image object stacked_composite will retain the metadata of the primary image (wet). You may also want to rename the bands with ee.Image.rename() either before or after stacking them.

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