AI-generated Key Takeaways
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Image.select is used to select bands from an image and returns an image with the selected bands.
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Bands can be selected using their names, numeric indices, or regular expressions.
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You can provide band selectors as multiple individual arguments or as a list.
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Selected bands can be renamed by providing a second list of new names that corresponds to the selected bands.
Returns an image with the selected bands.
| Usage | Returns |
|---|---|
Image.
select
(var_args)
|
Image |
Argument
Type
Details
this:
image
Image
The Image instance.
var_args
VarArgs<Object>
One of two possibilities:
- Any number of non-list arguments. All of these will be interpreted as band selectors. These can be band names, regexes, or numeric indices. E.g. selected = image.select('a', 'b', 3, 'd');
- Two lists. The first will be used as band selectors and the second as new names for the selected bands. The number of new names must match the number of selected bands. E.g. selected = image.select(['a', 4], ['newA', 'newB']);
Examples
Code Editor (JavaScript)
// A Sentinel-2 surface reflectance image. var img = ee . Image ( 'COPERNICUS/S2_SR/20210109T185751_20210109T185931_T10SEG' ); print ( 'All band names' , img . bandNames ()); print ( 'Select a band by name' , img . select ( 'B11' ). bandNames ()); print ( 'Select a band by index' , img . select ( 10 ). bandNames ()); print ( 'Select bands using a list' , img . select ([ 'B11' , 'B8' , 'B3' ]). bandNames ()); print ( 'Select bands by an argument series' , img . select ( 'B11' , 'B8' , 'B3' ). bandNames ()); print ( 'Mixing string and integer selectors is valid' , img . select ( 10 , 'B8' , 2 ). bandNames ()); print ( 'Rename selected bands using two corresponding lists' , img . select ([ 'B11' , 'B8' , 'B3' ], [ 'SWIR1' , 'NIR' , 'Green' ]). bandNames ()); // Use regular expressions to select bands. print ( 'Match "QA" followed by any two characters' , img . select ( 'QA..' ). bandNames ()); print ( 'Match "B" followed by any character, any number of times' , img . select ( 'B.*' ). bandNames ()); print ( 'Match "B" followed by any character, and any optional third character' , img . select ( 'B..?' ). bandNames ()); print ( 'Match "B" followed by a character in the range 6-8' , img . select ( 'B[6-8]' ). bandNames ()); print ( 'Match "B" followed by a character in the range 1-9 and then 1-2' , img . select ( 'B[1-9][1-2]' ). bandNames ()); print ( 'Match "B" or "QA" each followed by any character, any number of times.' , img . select ( 'B.*|QA.*' ). bandNames ());
import ee import geemap.core as geemap
Colab (Python)
# A Sentinel-2 surface reflectance image. img = ee . Image ( 'COPERNICUS/S2_SR/20210109T185751_20210109T185931_T10SEG' ) display ( 'All band names:' , img . bandNames ()) display ( 'Select a band by name:' , img . select ( 'B11' ) . bandNames ()) display ( 'Select a band by index:' , img . select ( 10 ) . bandNames ()) display ( 'Select bands using a list:' , img . select ([ 'B11' , 'B8' , 'B3' ]) . bandNames ()) display ( 'Select bands by an argument series:' , img . select ( 'B11' , 'B8' , 'B3' ) . bandNames ()) display ( 'Mixing string and integer selectors is valid:' , img . select ( 10 , 'B8' , 2 ) . bandNames ()) display ( 'Rename selected bands using two corresponding lists:' , img . select ([ 'B11' , 'B8' , 'B3' ], [ 'SWIR1' , 'NIR' , 'Green' ]) . bandNames ()) # Use regular expressions to select bands. display ( 'Match "QA" followed by any two characters:' , img . select ( 'QA..' ) . bandNames ()) display ( 'Match "B" followed by any character, any number of times:' , img . select ( 'B.*' ) . bandNames ()) display ( 'Match "B" followed by any character, and any optional third character' , img . select ( 'B..?' ) . bandNames ()) display ( 'Match "B" followed by a character in the range 6-8' , img . select ( 'B[6-8]' ) . bandNames ()) display ( 'Match "B" followed by a character in the range 1-9 and then 1-2' , img . select ( 'B[1-9][1-2]' ) . bandNames ()) display ( 'Match "B" or "QA" each followed by any character, any number of times.' , img . select ( 'B.*|QA.*' ) . bandNames ())
