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ee.Image.selfMask
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Aggiorna la maschera di un'immagine in tutte le posizioni in cui la maschera esistente non è zero utilizzando il valore dell'immagine come nuovo valore della maschera. L'immagine di output conserva i metadati e l'impronta dell'immagine di input.
Utilizzo | Resi |
---|
Image.selfMask() | Immagine |
Argomento | Tipo | Dettagli |
---|
questo: image | Immagine | L'immagine da mascherare con se stessa. |
Esempi
Editor di codice (JavaScript)
// A Sentinel-2 surface reflectance image.
var img = ee.Image('COPERNICUS/S2_SR/20210109T185751_20210109T185931_T10SEG');
var trueColorViz = {
bands: ['B4', 'B3', 'B2'],
min: 0,
max: 2700,
gamma: 1.3
};
print('Sentinel-2 image', img);
Map.setCenter(-122.36, 37.47, 10);
Map.addLayer(img, trueColorViz, 'Sentinel-2 image');
// Create a Boolean land mask from the SWIR1 band; water is value 0, land is 1.
var landMask = img.select('B11').gt(100);
print('Land mask', landMask);
Map.addLayer(landMask, {palette: ['blue', 'lightgreen']}, 'Land mask');
// Mask the land mask by itself; pixel values equal to 0 (water) become invalid.
var landMaskMasked = landMask.selfMask();
print('Land mask, masked', landMaskMasked);
Map.addLayer(landMaskMasked, {palette: ['gold']}, 'Land mask, masked');
Configurazione di Python
Consulta la pagina
Ambiente Python per informazioni sull'API Python e sull'utilizzo di
geemap
per lo sviluppo interattivo.
import ee
import geemap.core as geemap
Colab (Python)
# A Sentinel-2 surface reflectance image.
img = ee.Image('COPERNICUS/S2_SR/20210109T185751_20210109T185931_T10SEG')
true_color_viz = {
'bands': ['B4', 'B3', 'B2'],
'min': 0,
'max': 2700,
'gamma': 1.3,
}
display('Sentinel-2 image', img)
m = geemap.Map()
m.set_center(-122.36, 37.47, 10)
m.add_layer(img, true_color_viz, 'Sentinel-2 image')
# Create a Boolean land mask from the SWIR1 band water is value 0, land is 1.
land_mask = img.select('B11').gt(100)
display('Land mask', land_mask)
m.add_layer(land_mask, {'palette': ['blue', 'lightgreen']}, 'Land mask')
# Mask the land mask by itself pixel values equal to 0 (water) become invalid.
land_mask_masked = land_mask.selfMask()
display('Land mask, masked', land_mask_masked)
m.add_layer(land_mask_masked, {'palette': ['gold']}, 'Land mask, masked')
m
Salvo quando diversamente specificato, i contenuti di questa pagina sono concessi in base alla licenza Creative Commons Attribution 4.0, mentre gli esempi di codice sono concessi in base alla licenza Apache 2.0. Per ulteriori dettagli, consulta le norme del sito di Google Developers. Java è un marchio registrato di Oracle e/o delle sue consociate.
Ultimo aggiornamento 2025-07-26 UTC.
[null,null,["Ultimo aggiornamento 2025-07-26 UTC."],[[["\u003cp\u003eThe \u003ccode\u003eselfMask()\u003c/code\u003e method updates an image's mask using its own pixel values, where existing mask values of zero remain masked.\u003c/p\u003e\n"],["\u003cp\u003eThis effectively masks out areas where the image has a value of zero, making those pixels invalid.\u003c/p\u003e\n"],["\u003cp\u003eThe output image retains the original metadata and footprint.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eselfMask()\u003c/code\u003e is commonly used with Boolean masks to isolate areas of interest based on specific pixel values.\u003c/p\u003e\n"]]],["The `selfMask()` method updates an image's mask. It uses the image's pixel values as the new mask, keeping only areas where the existing mask is non-zero. Areas where the image value is zero are removed, becoming invalid. The output image retains the input's metadata and footprint. The example demonstrates creating a land/water mask and then applying `selfMask()` to remove areas with a value of zero, representing water.\n"],null,["# ee.Image.selfMask\n\nUpdates an image's mask at all positions where the existing mask is not zero using the value of the image as the new mask value. The output image retains the metadata and footprint of the input image.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|--------------------|---------|\n| Image.selfMask`()` | Image |\n\n| Argument | Type | Details |\n|---------------|-------|--------------------------------|\n| this: `image` | Image | The image to mask with itself. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// A Sentinel-2 surface reflectance image.\nvar img = ee.Image('COPERNICUS/S2_SR/20210109T185751_20210109T185931_T10SEG');\nvar trueColorViz = {\n bands: ['B4', 'B3', 'B2'],\n min: 0,\n max: 2700,\n gamma: 1.3\n};\nprint('Sentinel-2 image', img);\nMap.setCenter(-122.36, 37.47, 10);\nMap.addLayer(img, trueColorViz, 'Sentinel-2 image');\n\n// Create a Boolean land mask from the SWIR1 band; water is value 0, land is 1.\nvar landMask = img.select('B11').gt(100);\nprint('Land mask', landMask);\nMap.addLayer(landMask, {palette: ['blue', 'lightgreen']}, 'Land mask');\n\n// Mask the land mask by itself; pixel values equal to 0 (water) become invalid.\nvar landMaskMasked = landMask.selfMask();\nprint('Land mask, masked', landMaskMasked);\nMap.addLayer(landMaskMasked, {palette: ['gold']}, 'Land mask, masked');\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 Sentinel-2 surface reflectance image.\nimg = ee.Image('COPERNICUS/S2_SR/20210109T185751_20210109T185931_T10SEG')\ntrue_color_viz = {\n 'bands': ['B4', 'B3', 'B2'],\n 'min': 0,\n 'max': 2700,\n 'gamma': 1.3,\n}\ndisplay('Sentinel-2 image', img)\nm = geemap.Map()\nm.set_center(-122.36, 37.47, 10)\nm.add_layer(img, true_color_viz, 'Sentinel-2 image')\n\n# Create a Boolean land mask from the SWIR1 band water is value 0, land is 1.\nland_mask = img.select('B11').gt(100)\ndisplay('Land mask', land_mask)\nm.add_layer(land_mask, {'palette': ['blue', 'lightgreen']}, 'Land mask')\n\n# Mask the land mask by itself pixel values equal to 0 (water) become invalid.\nland_mask_masked = land_mask.selfMask()\ndisplay('Land mask, masked', land_mask_masked)\nm.add_layer(land_mask_masked, {'palette': ['gold']}, 'Land mask, masked')\nm\n```"]]