I need to reclassify slope raster (val: 0-90) to 9 classes (1-9). I used this code but the output raster cannot be displayed. What did I do wrong?

// Add features
var sumatera = ee.FeatureCollection("users/putraditama/sumatera");

// Add raster
var elev = ee.Image("USGS/SRTMGL1_003")

// Clip elev to Sumatera boundary
var elevsmrt = elev.clip(sumatera);

// Get slope
var slopesmrt = ee.Terrain.slope(elevsmrt);

// Remap values
var slopereclass = slopesmrt

// Display the result.
Map.addLayer(slopesmrt, {min: 0, max :90, palette: ['black', 'white']},'slope');
Map.addLayer(slopereclass, {min: 1, max :9}, 'slopereclass');

ee.Image.remap() operates on individual values, not ranges of numbers like your example shows.

Given that you are trying to convert the slope values to a set of bins with equal spacing, you can just divide and set it next highest integer using ee.Image.ceil().

// Add features.
var feature = ee.FeatureCollection("USDOS/LSIB_SIMPLE/2017")
             .filter(ee.Filter.eq('country_na', 'Switzerland'));

// Add raster.
var elev = ee.Image("USGS/SRTMGL1_003");

// Get slope.
var slopesmrt = ee.Terrain.slope(elev);

// Remap values.
var slopereclass = slopesmrt.divide(10).ceil();

// Display the result.
Map.addLayer(slopesmrt.clip(feature), {min: 0, max: 90, palette: ['black', 'white']},'slope');
Map.addLayer(slopereclass.clip(feature), {min: 1, max: 9, palette: ['black', 'red']}, 'slopereclass');

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.