Re: [google-appengine] visualization of classification result using color palette

[Alex Martelli]

This group is meant for discussion about Google App Engine, the product covered at https://cloud.google.com/appengine/ and links therefrom. Said product is not related to Google Earth Engine. For discussion about the latter, please start at https://productforums.google.com/forum/#!forum/maps .

Thanks,

Alex

On Mon, Jul 10, 2017 at 9:35 AM, Marieke Laengner <laen...@geophysik.uni-kiel.de> wrote:

Hi,

I wrote a script in Google Earth Engine which performs a landuse classification. I gave every class its own color (e.g. urban areas = red). For the web application using Google App Engine I had to translate the javascript script to python and I don't know how to add the color palette to my classification result here. 

The following javascript code worked in GEE:

 // 2) Create colored Classification image

  

  var PALETTE = [

      '#ffffff', // no data

      '#FFFFFF', // clouds

      '#D3D3D3', // Elevated areas (>900m)

      '#87CEFA', // water

      '#9ACD32', // agriculture

      '#006400', // vegetation (cropland and forest)

      '#FFFF00', // Shore areas

      'cc0013', // urban

      '#A52A2A', // bare land

  ].join(',');

  

  var vis_params = {min: 0, max: 8, palette: PALETTE};

Map.addLayer(finalImage, vis_params, 'Landuse classification');

In Google App Engine I tried it like this (the color codes are not the right colors yet, I only put them there to test it):

# 2) Create colored Classification image

  

    PALETTE = ['F0F8FF','FAEBD7','00FFFF', 'F0F8FF', 'FAEBD7', '00FFFF', 'F0F8FF', '00FFFF', '00FFFF',]

  # Visualization

    

    DTCfinal_viz = DTCfinal.getMapId({

          'min': 0,

          'max': 8,

          'palette': 'PALETTE',

          'bands': ','.join(['constant'])

      })

    layers.append({

          'mapid': DTCfinal_viz['mapid'],

          'label': 'DTC final',

          'token': DTCfinal_viz['token']

      })

It doesn't work.

Does someone has an idea how I can color my classification result?

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