ee.Image.changeProj
קל לארגן דפים בעזרת אוספים
אפשר לשמור ולסווג תוכן על סמך ההעדפות שלך.
משנה את ההטלה של תמונת הקלט, ומעביר כל פיקסל מהמיקום שלו ב-srcProj לאותן קואורדינטות ב-dstProj.
שימוש | החזרות |
---|
Image.changeProj(srcProj, dstProj) | תמונה |
ארגומנט | סוג | פרטים |
---|
זה: input | תמונה | |
srcProj | היטל | ההקרנה המקורית. |
dstProj | היטל | ההטלה החדשה. |
דוגמאות
עורך הקוד (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');
הגדרת Python
מידע על Python API ועל שימוש ב-geemap
לפיתוח אינטראקטיבי מופיע בדף
Python Environment.
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
אלא אם צוין אחרת, התוכן של דף זה הוא ברישיון Creative Commons Attribution 4.0 ודוגמאות הקוד הן ברישיון Apache 2.0. לפרטים, ניתן לעיין במדיניות האתר Google Developers. Java הוא סימן מסחרי רשום של חברת Oracle ו/או של השותפים העצמאיים שלה.
עדכון אחרון: 2025-07-26 (שעון UTC).
[null,null,["עדכון אחרון: 2025-07-26 (שעון UTC)."],[[["\u003cp\u003e\u003ccode\u003eImage.changeProj()\u003c/code\u003e modifies the projection of an image by moving pixels to match coordinates in a new projection.\u003c/p\u003e\n"],["\u003cp\u003eIt takes the original projection (\u003ccode\u003esrcProj\u003c/code\u003e) and the target projection (\u003ccode\u003edstProj\u003c/code\u003e) as inputs.\u003c/p\u003e\n"],["\u003cp\u003eYou can define projections using WKT strings or EPSG codes.\u003c/p\u003e\n"],["\u003cp\u003eThe function returns a new Image object with the altered projection.\u003c/p\u003e\n"],["\u003cp\u003eThis is useful for visualizing or processing data in different coordinate systems.\u003c/p\u003e\n"]]],["The `changeProj` function modifies an image's projection by relocating each pixel from its original projection (`srcProj`) to a new projection (`dstProj`). This is done by taking an image object as input and takes in two parameters `srcProj` and `dstProj`. For example, it takes a DEM image, defines a Robinson projection with an adjusted scale, and then applies `changeProj` to re-project the image onto the map canvas projection (`EPSG:3857`). The result is an image with the modified projection.\n"],null,["# ee.Image.changeProj\n\nTweaks the projection of the input image, moving each pixel from its location in srcProj to the same coordinates in dstProj.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|--------------------------------------|---------|\n| Image.changeProj`(srcProj, dstProj)` | Image |\n\n| Argument | Type | Details |\n|---------------|------------|--------------------------|\n| this: `input` | Image | |\n| `srcProj` | Projection | The original projection. |\n| `dstProj` | Projection | The new projection. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// A DEM image object.\nvar img = ee.Image('MERIT/DEM/v1_0_3');\n\n// Construct a projection object from a WKT string or EPSG code, for example,\n// the Robinson projection (https://epsg.io/54030).\nvar proj = ee.Projection(\n 'PROJCS[\"World_Robinson\",' +\n 'GEOGCS[\"GCS_WGS_1984\",' +\n 'DATUM[\"WGS_1984\",' +\n 'SPHEROID[\"WGS_1984\",6378137,298.257223563]],' +\n 'PRIMEM[\"Greenwich\",0],' +\n 'UNIT[\"Degree\",0.017453292519943295]],' +\n 'PROJECTION[\"Robinson\"],' +\n 'UNIT[\"Meter\",1]]'\n)\n// Optionally adjust projection scale; stretch layer larger in this case.\n.scale(0.9, 0.9);\n\n// \"Paint\" the image in the desired projection onto the projection of\n// the map canvas ('EPSG:3857').\nvar imgProj = img.changeProj(proj, 'EPSG:3857');\n\n// Add an overlay image to the map to cover the default base layers.\nMap.setCenter(0, 0, 2);\nMap.addLayer(ee.Image(1), {palette: 'grey'}, 'Grey background', false);\n\n// Add the projection-tweaked image to the map.\nMap.addLayer(imgProj, {min: 0, max: 3000}, 'DEM in Robinson projection');\n```\nPython setup\n\nSee the [Python Environment](/earth-engine/guides/python_install) page for information on the Python API and using\n`geemap` for interactive development. \n\n```python\nimport ee\nimport geemap.core as geemap\n```\n\n### Colab (Python)\n\n```python\n# A DEM image object.\nimg = ee.Image('MERIT/DEM/v1_0_3')\n\n# Construct a projection object from a WKT string or EPSG code, for example,\n# the Robinson projection (https://epsg.io/54030).\nproj = (\n ee.Projection(\n 'PROJCS[\"World_Robinson\",'\n + 'GEOGCS[\"GCS_WGS_1984\",'\n + 'DATUM[\"WGS_1984\",'\n + 'SPHEROID[\"WGS_1984\",6378137,298.257223563]],'\n + 'PRIMEM[\"Greenwich\",0],'\n + 'UNIT[\"Degree\",0.017453292519943295]],'\n + 'PROJECTION[\"Robinson\"],'\n + 'UNIT[\"Meter\",1]]'\n )\n # Optionally adjust projection scale stretch layer larger in this case.\n .scale(0.9, 0.9)\n)\n\n# \"Paint\" the image in the desired projection onto the projection of\n# the map canvas ('EPSG:3857').\nimg_proj = img.changeProj(proj, 'EPSG:3857')\n\n# Add an overlay image to the map to cover the default base layers.\nm = geemap.Map()\nm.set_center(0, 0, 2)\nm.add_layer(ee.Image(1), {'palette': 'grey'}, 'Grey background', False)\n\n# Add the projection-tweaked image to the map.\nm.add_layer(\n img_proj,\n {'min': 0, 'max': 3000},\n 'DEM in Robinson projection',\n)\nm\n```"]]