Multiband Raster Reclassification in QGIS The Next CEO of Stack OverflowHow to reclass a raster with reclassify grid values in QGIS?How to reclassify in Rastercalc?Performing Raster Reclassification in QGIS?How to get the “absolute value” of a raster cell in QGIS?Why is quantile reclassification method yielding classes of vastly different cell counts?Reclassify on land cover raster won't workraster sytling multiband rendering 0=nodataReclassify Raster in ArcGIS Pro 2 by Multiple BandsReclassify Tool Resulting in NoData where Input has DataRetaining integer values in raster when reclassifying values in QGIS?Reclassification and Con(0 not working arcpyReclassification of MODIS collection in Google Earth Engine
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Multiband Raster Reclassification in QGIS
The Next CEO of Stack OverflowHow to reclass a raster with reclassify grid values in QGIS?How to reclassify in Rastercalc?Performing Raster Reclassification in QGIS?How to get the “absolute value” of a raster cell in QGIS?Why is quantile reclassification method yielding classes of vastly different cell counts?Reclassify on land cover raster won't workraster sytling multiband rendering 0=nodataReclassify Raster in ArcGIS Pro 2 by Multiple BandsReclassify Tool Resulting in NoData where Input has DataRetaining integer values in raster when reclassifying values in QGIS?Reclassification and Con(0 not working arcpyReclassification of MODIS collection in Google Earth Engine
I have a raster which nodata is 0,0,0 in all three bands, how can I reclassify them into 255,255,255?
qgis reclassify
asked Jan 4 '17 at 0:38
chenghopanchenghopan
724420
bumped to the homepage by Community♦ yesterday
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I have a raster which nodata is 0,0,0 in all three bands, how can I reclassify them into 255,255,255?
qgis reclassify
asked Jan 4 '17 at 0:38
chenghopanchenghopan
724420
bumped to the homepage by Community♦ yesterday
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
1
Have you tried playing around with the 'Raster Calculator' under the Raster dropdown menu? (see e.g. gis.stackexchange.com/questions/27988/…). You can also use GRASS under Processing -> Toolbox (see e.g. gis.stackexchange.com/questions/121532/…).
– weiji14
Jan 4 '17 at 1:25
Also, take a look at this: lutraconsulting.co.uk/blog/2016/09/05/serval
– Albert
Jan 4 '17 at 11:40
add a comment |
I have a raster which nodata is 0,0,0 in all three bands, how can I reclassify them into 255,255,255?
qgis reclassify
asked Jan 4 '17 at 0:38
chenghopanchenghopan
724420
I have a raster which nodata is 0,0,0 in all three bands, how can I reclassify them into 255,255,255?
qgis reclassify
qgis reclassify
asked Jan 4 '17 at 0:38
chenghopanchenghopan
724420
asked Jan 4 '17 at 0:38
chenghopanchenghopan
724420
asked Jan 4 '17 at 0:38
chenghopanchenghopan
724420
asked Jan 4 '17 at 0:38
chenghopanchenghopan
724420
asked Jan 4 '17 at 0:38
chenghopanchenghopan
724420
724420
bumped to the homepage by Community♦ yesterday
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ yesterday
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
1
Have you tried playing around with the 'Raster Calculator' under the Raster dropdown menu? (see e.g. gis.stackexchange.com/questions/27988/…). You can also use GRASS under Processing -> Toolbox (see e.g. gis.stackexchange.com/questions/121532/…).
– weiji14
Jan 4 '17 at 1:25
Also, take a look at this: lutraconsulting.co.uk/blog/2016/09/05/serval
– Albert
Jan 4 '17 at 11:40
add a comment |
1
Have you tried playing around with the 'Raster Calculator' under the Raster dropdown menu? (see e.g. gis.stackexchange.com/questions/27988/…). You can also use GRASS under Processing -> Toolbox (see e.g. gis.stackexchange.com/questions/121532/…).
– weiji14
Jan 4 '17 at 1:25
Also, take a look at this: lutraconsulting.co.uk/blog/2016/09/05/serval
– Albert
Jan 4 '17 at 11:40
1
1
Have you tried playing around with the 'Raster Calculator' under the Raster dropdown menu? (see e.g. gis.stackexchange.com/questions/27988/…). You can also use GRASS under Processing -> Toolbox (see e.g. gis.stackexchange.com/questions/121532/…).
– weiji14
Jan 4 '17 at 1:25
Have you tried playing around with the 'Raster Calculator' under the Raster dropdown menu? (see e.g. gis.stackexchange.com/questions/27988/…). You can also use GRASS under Processing -> Toolbox (see e.g. gis.stackexchange.com/questions/121532/…).
– weiji14
Jan 4 '17 at 1:25
Also, take a look at this: lutraconsulting.co.uk/blog/2016/09/05/serval
– Albert
Jan 4 '17 at 11:40
Also, take a look at this: lutraconsulting.co.uk/blog/2016/09/05/serval
– Albert
Jan 4 '17 at 11:40
add a comment |
1 Answer
1
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oldest
votes
QGIS Raster Calculator returns only one image at a time, so you need to calculate it for each band.
# Band1
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@1
This may look complicated;
- When the cell is RGB(0,0,0), the first line becomes
(0=0)*(0=0)*(0=0)*255, which meansTrue*True*True*255or1*1*1*255. So it outputs cell value255. - At the same time the second line becomes
((0>0)+(0>0)+(0>0))>0*band1, which means((False+False+False)>0)*band1or(0+0+0)>0*band1. So it returns zero. - Overall, this expression replaces Band1=
0by255if input cells are RGB(0,0,0).
Repeat this for Band 2 and Band 3:
# Band2
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@2
# Band3
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@3
Final step: Merge these new rasters into single raster.
answered Oct 28 '18 at 5:24
KazuhitoKazuhito
16.3k41884
add a comment |
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1 Answer
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1 Answer
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active
oldest
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active
oldest
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active
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QGIS Raster Calculator returns only one image at a time, so you need to calculate it for each band.
# Band1
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@1
This may look complicated;
- When the cell is RGB(0,0,0), the first line becomes
(0=0)*(0=0)*(0=0)*255, which meansTrue*True*True*255or1*1*1*255. So it outputs cell value255. - At the same time the second line becomes
((0>0)+(0>0)+(0>0))>0*band1, which means((False+False+False)>0)*band1or(0+0+0)>0*band1. So it returns zero. - Overall, this expression replaces Band1=
0by255if input cells are RGB(0,0,0).
Repeat this for Band 2 and Band 3:
# Band2
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@2
# Band3
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@3
Final step: Merge these new rasters into single raster.
answered Oct 28 '18 at 5:24
KazuhitoKazuhito
16.3k41884
add a comment |
QGIS Raster Calculator returns only one image at a time, so you need to calculate it for each band.
# Band1
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@1
This may look complicated;
- When the cell is RGB(0,0,0), the first line becomes
(0=0)*(0=0)*(0=0)*255, which meansTrue*True*True*255or1*1*1*255. So it outputs cell value255. - At the same time the second line becomes
((0>0)+(0>0)+(0>0))>0*band1, which means((False+False+False)>0)*band1or(0+0+0)>0*band1. So it returns zero. - Overall, this expression replaces Band1=
0by255if input cells are RGB(0,0,0).
Repeat this for Band 2 and Band 3:
# Band2
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@2
# Band3
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@3
Final step: Merge these new rasters into single raster.
answered Oct 28 '18 at 5:24
KazuhitoKazuhito
16.3k41884
add a comment |
QGIS Raster Calculator returns only one image at a time, so you need to calculate it for each band.
# Band1
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@1
This may look complicated;
- When the cell is RGB(0,0,0), the first line becomes
(0=0)*(0=0)*(0=0)*255, which meansTrue*True*True*255or1*1*1*255. So it outputs cell value255. - At the same time the second line becomes
((0>0)+(0>0)+(0>0))>0*band1, which means((False+False+False)>0)*band1or(0+0+0)>0*band1. So it returns zero. - Overall, this expression replaces Band1=
0by255if input cells are RGB(0,0,0).
Repeat this for Band 2 and Band 3:
# Band2
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@2
# Band3
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@3
Final step: Merge these new rasters into single raster.
answered Oct 28 '18 at 5:24
KazuhitoKazuhito
16.3k41884
QGIS Raster Calculator returns only one image at a time, so you need to calculate it for each band.
# Band1
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@1
This may look complicated;
- When the cell is RGB(0,0,0), the first line becomes
(0=0)*(0=0)*(0=0)*255, which meansTrue*True*True*255or1*1*1*255. So it outputs cell value255. - At the same time the second line becomes
((0>0)+(0>0)+(0>0))>0*band1, which means((False+False+False)>0)*band1or(0+0+0)>0*band1. So it returns zero. - Overall, this expression replaces Band1=
0by255if input cells are RGB(0,0,0).
Repeat this for Band 2 and Band 3:
# Band2
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@2
# Band3
(BM24_10K_0501@1 = 0) * (BM24_10K_0501@2 = 0) * (BM24_10K_0501@3 = 0) * 255
+ (((BM24_10K_0501@1 > 0) + (BM24_10K_0501@2 > 0) + (BM24_10K_0501@3 > 0))>0) * BM24_10K_0501@3
Final step: Merge these new rasters into single raster.
answered Oct 28 '18 at 5:24
KazuhitoKazuhito
16.3k41884
answered Oct 28 '18 at 5:24
KazuhitoKazuhito
16.3k41884
answered Oct 28 '18 at 5:24
KazuhitoKazuhito
16.3k41884
answered Oct 28 '18 at 5:24
KazuhitoKazuhito
16.3k41884
16.3k41884
add a comment |
add a comment |
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Have you tried playing around with the 'Raster Calculator' under the Raster dropdown menu? (see e.g. gis.stackexchange.com/questions/27988/…). You can also use GRASS under Processing -> Toolbox (see e.g. gis.stackexchange.com/questions/121532/…).
– weiji14
Jan 4 '17 at 1:25
Also, take a look at this: lutraconsulting.co.uk/blog/2016/09/05/serval
– Albert
Jan 4 '17 at 11:40