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ee.Image.changeProj
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Tweaks the projection of the input image, moving each pixel from its location in srcProj to the same coordinates in dstProj.
Usage Returns Image. changeProj (srcProj, dstProj)
Image
Argument Type Details this: input
Image srcProj
Projection The original projection. dstProj
Projection The new projection.
Examples
Code Editor (JavaScript)
// A DEM image object.
var img = ee.Image('MERIT/DEM/v1_0_3');
// Construct a projection object from a WKT string or EPSG code, for example,
// the Robinson projection (https://epsg.io/54030).
var proj = ee.Projection(
'PROJCS["World_Robinson",' +
'GEOGCS["GCS_WGS_1984",' +
'DATUM["WGS_1984",' +
'SPHEROID["WGS_1984",6378137,298.257223563]],' +
'PRIMEM["Greenwich",0],' +
'UNIT["Degree",0.017453292519943295]],' +
'PROJECTION["Robinson"],' +
'UNIT["Meter",1]]'
)
// Optionally adjust projection scale; stretch layer larger in this case.
.scale(0.9, 0.9);
// "Paint" the image in the desired projection onto the projection of
// the map canvas ('EPSG:3857').
var imgProj = img.changeProj(proj, 'EPSG:3857');
// Add an overlay image to the map to cover the default base layers.
Map.setCenter(0, 0, 2);
Map.addLayer(ee.Image(1), {palette: 'grey'}, 'Grey background', false);
// Add the projection-tweaked image to the map.
Map.addLayer(imgProj, {min: 0, max: 3000}, 'DEM in Robinson projection');
Python setup
See the
Python Environment page for information on the Python API and using
geemap
for interactive development.
import ee
import geemap.core as geemap
Colab (Python)
# A DEM image object.
img = ee.Image('MERIT/DEM/v1_0_3')
# Construct a projection object from a WKT string or EPSG code, for example,
# the Robinson projection (https://epsg.io/54030).
proj = (
ee.Projection(
'PROJCS["World_Robinson",'
+ 'GEOGCS["GCS_WGS_1984",'
+ 'DATUM["WGS_1984",'
+ 'SPHEROID["WGS_1984",6378137,298.257223563]],'
+ 'PRIMEM["Greenwich",0],'
+ 'UNIT["Degree",0.017453292519943295]],'
+ 'PROJECTION["Robinson"],'
+ 'UNIT["Meter",1]]'
)
# Optionally adjust projection scale stretch layer larger in this case.
.scale(0.9, 0.9)
)
# "Paint" the image in the desired projection onto the projection of
# the map canvas ('EPSG:3857').
img_proj = img.changeProj(proj, 'EPSG:3857')
# Add an overlay image to the map to cover the default base layers.
m = geemap.Map()
m.set_center(0, 0, 2)
m.add_layer(ee.Image(1), {'palette': 'grey'}, 'Grey background', False)
# Add the projection-tweaked image to the map.
m.add_layer(
img_proj,
{'min': 0, 'max': 3000},
'DEM in Robinson projection',
)
m
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Last updated 2023-10-06 UTC.
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Need to tell us more?
{"lastModified": "Last updated 2023-10-06 UTC."}
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