Performing Raster Reclassification in QGIS? The Next CEO of Stack OverflowMultiple reclassification using RasterCalc in QGISReclassifying raster analysis (like the one in ArcGIS Spatial Analyst) in QGISNo cell value in raster fileHow to reclassify a float raster?How to reclass a raster with reclassify grid values in QGIS?How to classify/style rasters correctly?Export classified raster Class Values from DEMClassifying slope (flat, slope, steep, very steep) in QGIS?How to replace the Nan or nodata values into 0?Retrieve Elevation from Color in Raster DEMCreating a Raster FilterMultiple reclassification using RasterCalc in QGISHow to reclassify a float raster?How to Smooth Polygons after converting DEM using Raster to Polygon?How to change the pixel value of a raster dataset which overlaps a polygon featured shapefile in ArcGISReclassifying raster analysis (like the one in ArcGIS Spatial Analyst) in QGISReclassify raster based on Z-values in Arcmap 10.4.1Raster reclassification in QGIS or other open source software with automatically calculated breaksRetaining integer values in raster when reclassifying values in QGIS?Partial raster reclassify in QGIS
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Performing Raster Reclassification in QGIS?
The Next CEO of Stack OverflowMultiple reclassification using RasterCalc in QGISReclassifying raster analysis (like the one in ArcGIS Spatial Analyst) in QGISNo cell value in raster fileHow to reclassify a float raster?How to reclass a raster with reclassify grid values in QGIS?How to classify/style rasters correctly?Export classified raster Class Values from DEMClassifying slope (flat, slope, steep, very steep) in QGIS?How to replace the Nan or nodata values into 0?Retrieve Elevation from Color in Raster DEMCreating a Raster FilterMultiple reclassification using RasterCalc in QGISHow to reclassify a float raster?How to Smooth Polygons after converting DEM using Raster to Polygon?How to change the pixel value of a raster dataset which overlaps a polygon featured shapefile in ArcGISReclassifying raster analysis (like the one in ArcGIS Spatial Analyst) in QGISReclassify raster based on Z-values in Arcmap 10.4.1Raster reclassification in QGIS or other open source software with automatically calculated breaksRetaining integer values in raster when reclassifying values in QGIS?Partial raster reclassify in QGIS
Is there a way to perform a reclassify of a raster image in QGIS?
In ArcGIS you can do that in Spatial analyst Tools→Reclass→Reclassify
Any ideas?
qgis raster reclassify
add a comment |
Is there a way to perform a reclassify of a raster image in QGIS?
In ArcGIS you can do that in Spatial analyst Tools→Reclass→Reclassify
Any ideas?
qgis raster reclassify
The other way is using Raster Calculator. It explains in this entry hub.qgis.org/issues/7581
– user26155
Jan 24 '14 at 3:02
1
You link to a page that describes a workaround and states "the workaround is awful"!
– whuber♦
Jan 24 '14 at 17:49
The best solution I found is in this thread: gis.stackexchange.com/questions/121532/reclass-in-qgis
– DPSSpatial
Feb 25 '16 at 20:16
add a comment |
Is there a way to perform a reclassify of a raster image in QGIS?
In ArcGIS you can do that in Spatial analyst Tools→Reclass→Reclassify
Any ideas?
qgis raster reclassify
Is there a way to perform a reclassify of a raster image in QGIS?
In ArcGIS you can do that in Spatial analyst Tools→Reclass→Reclassify
Any ideas?
qgis raster reclassify
qgis raster reclassify
edited Oct 4 '17 at 3:50
PolyGeo♦
53.8k1781245
53.8k1781245
asked Dec 8 '11 at 13:38
VassilisVassilis
1,67753450
1,67753450
The other way is using Raster Calculator. It explains in this entry hub.qgis.org/issues/7581
– user26155
Jan 24 '14 at 3:02
1
You link to a page that describes a workaround and states "the workaround is awful"!
– whuber♦
Jan 24 '14 at 17:49
The best solution I found is in this thread: gis.stackexchange.com/questions/121532/reclass-in-qgis
– DPSSpatial
Feb 25 '16 at 20:16
add a comment |
The other way is using Raster Calculator. It explains in this entry hub.qgis.org/issues/7581
– user26155
Jan 24 '14 at 3:02
1
You link to a page that describes a workaround and states "the workaround is awful"!
– whuber♦
Jan 24 '14 at 17:49
The best solution I found is in this thread: gis.stackexchange.com/questions/121532/reclass-in-qgis
– DPSSpatial
Feb 25 '16 at 20:16
The other way is using Raster Calculator. It explains in this entry hub.qgis.org/issues/7581
– user26155
Jan 24 '14 at 3:02
The other way is using Raster Calculator. It explains in this entry hub.qgis.org/issues/7581
– user26155
Jan 24 '14 at 3:02
1
1
You link to a page that describes a workaround and states "the workaround is awful"!
– whuber♦
Jan 24 '14 at 17:49
You link to a page that describes a workaround and states "the workaround is awful"!
– whuber♦
Jan 24 '14 at 17:49
The best solution I found is in this thread: gis.stackexchange.com/questions/121532/reclass-in-qgis
– DPSSpatial
Feb 25 '16 at 20:16
The best solution I found is in this thread: gis.stackexchange.com/questions/121532/reclass-in-qgis
– DPSSpatial
Feb 25 '16 at 20:16
add a comment |
7 Answers
7
active
oldest
votes
Using GRASS and the r.reclass module, yes. However, you actually need to use the keyword "thru".
Example:
For a raster elevation grid, to be reclassified into values based on 100m-intervals:
500 thru 599.99 = 500
600 thru 699.99 = 600
700 thru 799.99 = 700
Etc.. And you save that into a notepad text document(with no spaces between lines). Then when opening the r.reclass module, you will simply load that rulefile into the gui and away you go.
Experience: I just performed a reclassification on a DEM for my thesis project in Tajikistan over the weekend using this method and it worked a treat.
*Note(caveat): You might look into modeling this process or even using GDAL to output a *.prj file alongside the output for use in Arc, as the outputs I've seen from this thus far contain no projection definition readable by Arc. If you're sticking with QGIS, tho, then you should be good-to-go.
One more thing, as with any QGIS/GRASS/GDAL processes, ensure you have downloaded the OSGeo4W Installer which ensures you have everything up-to-date:
http://trac.osgeo.org/osgeo4w/
Hope this helps.
2
r.reclass only accepts integers
– nickves
Apr 3 '13 at 23:26
add a comment |
With the Advanced Interface option of the toolbox, I use the Reclassify Grid Values from the SAGA GIS, It a really intuitive tool with options of reclassification by single value, range and using a table.
I prefer this over the r.reclass because you do not have to create additional files.
add a comment |
I was able to reclassify a raster using the raster calculator
Here the "Habitat" raster is reclassed from continuous values (0-1) to discrete values of 1,2,3
("Habitat@1" < 0.3)* 1 + (("Habitat@1" >= 0.3) AND ("Habitat@1" < 0.6)) *2 + ("Habitat@1" >=0.6)* 3
add a comment |
The easier way is to use GRASS (also using the QGIS/GRASS plugin) and the r.reclass module.
You will need to create a reclassification rule file, where you can use the keyword "through" or the wildcard "*" to reclassify multiple values in one rule.
Do you know what a reclass table file should look like for the GRASS tool?
– DPSSpatial
Feb 8 '13 at 21:36
2
Sure: grass.osgeo.org/grass64/manuals/r.reclass.html
– Giovanni Manghi
Feb 26 '13 at 16:26
That's great - I got it to work and it's really fast ... thanks for this!
– DPSSpatial
Feb 29 '16 at 18:15
add a comment |
I guess my post doesn´t aswer the question accurately, but it could maybe provide some help. I haven´t found a simple way to do this in QGIS, like Bryce I use GRASS modules. However, if have ArcGIS but no Spatial Analyst, there´s another great tool: GME (http://www.spatialecology.com/gme/). It´s dependent on ArcGIS and R and has a multitude of really great features, one of them beeing 'reclassify'. Here, just like in GRASS, you need to create a text file containing the class definitions. I´ve used ArcMap to visualize the raster in question in different ways first to get a better idea of what the data looks like. Then I´ve defined the new classes based on that info. Its worked like a charm for me. I don´t know if GME will run on a system without ArcGIS, I´d be curious to know.
add a comment |
Raster calculator is your best bet if you don't like grass interface
add a comment |
QGIS now has two native raster reclassify algorithms
Reclassify by layer - allows you to use a vector layer to dictate your ranges
Reclassify by table - works much like ArcGIS raster reclassify spatial analyst tool.
These were added in QGIS 3.2 see the change log here.
add a comment |
protected by Midavalo♦ Mar 2 '17 at 22:07
Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?
7 Answers
7
active
oldest
votes
7 Answers
7
active
oldest
votes
active
oldest
votes
active
oldest
votes
Using GRASS and the r.reclass module, yes. However, you actually need to use the keyword "thru".
Example:
For a raster elevation grid, to be reclassified into values based on 100m-intervals:
500 thru 599.99 = 500
600 thru 699.99 = 600
700 thru 799.99 = 700
Etc.. And you save that into a notepad text document(with no spaces between lines). Then when opening the r.reclass module, you will simply load that rulefile into the gui and away you go.
Experience: I just performed a reclassification on a DEM for my thesis project in Tajikistan over the weekend using this method and it worked a treat.
*Note(caveat): You might look into modeling this process or even using GDAL to output a *.prj file alongside the output for use in Arc, as the outputs I've seen from this thus far contain no projection definition readable by Arc. If you're sticking with QGIS, tho, then you should be good-to-go.
One more thing, as with any QGIS/GRASS/GDAL processes, ensure you have downloaded the OSGeo4W Installer which ensures you have everything up-to-date:
http://trac.osgeo.org/osgeo4w/
Hope this helps.
2
r.reclass only accepts integers
– nickves
Apr 3 '13 at 23:26
add a comment |
Using GRASS and the r.reclass module, yes. However, you actually need to use the keyword "thru".
Example:
For a raster elevation grid, to be reclassified into values based on 100m-intervals:
500 thru 599.99 = 500
600 thru 699.99 = 600
700 thru 799.99 = 700
Etc.. And you save that into a notepad text document(with no spaces between lines). Then when opening the r.reclass module, you will simply load that rulefile into the gui and away you go.
Experience: I just performed a reclassification on a DEM for my thesis project in Tajikistan over the weekend using this method and it worked a treat.
*Note(caveat): You might look into modeling this process or even using GDAL to output a *.prj file alongside the output for use in Arc, as the outputs I've seen from this thus far contain no projection definition readable by Arc. If you're sticking with QGIS, tho, then you should be good-to-go.
One more thing, as with any QGIS/GRASS/GDAL processes, ensure you have downloaded the OSGeo4W Installer which ensures you have everything up-to-date:
http://trac.osgeo.org/osgeo4w/
Hope this helps.
2
r.reclass only accepts integers
– nickves
Apr 3 '13 at 23:26
add a comment |
Using GRASS and the r.reclass module, yes. However, you actually need to use the keyword "thru".
Example:
For a raster elevation grid, to be reclassified into values based on 100m-intervals:
500 thru 599.99 = 500
600 thru 699.99 = 600
700 thru 799.99 = 700
Etc.. And you save that into a notepad text document(with no spaces between lines). Then when opening the r.reclass module, you will simply load that rulefile into the gui and away you go.
Experience: I just performed a reclassification on a DEM for my thesis project in Tajikistan over the weekend using this method and it worked a treat.
*Note(caveat): You might look into modeling this process or even using GDAL to output a *.prj file alongside the output for use in Arc, as the outputs I've seen from this thus far contain no projection definition readable by Arc. If you're sticking with QGIS, tho, then you should be good-to-go.
One more thing, as with any QGIS/GRASS/GDAL processes, ensure you have downloaded the OSGeo4W Installer which ensures you have everything up-to-date:
http://trac.osgeo.org/osgeo4w/
Hope this helps.
Using GRASS and the r.reclass module, yes. However, you actually need to use the keyword "thru".
Example:
For a raster elevation grid, to be reclassified into values based on 100m-intervals:
500 thru 599.99 = 500
600 thru 699.99 = 600
700 thru 799.99 = 700
Etc.. And you save that into a notepad text document(with no spaces between lines). Then when opening the r.reclass module, you will simply load that rulefile into the gui and away you go.
Experience: I just performed a reclassification on a DEM for my thesis project in Tajikistan over the weekend using this method and it worked a treat.
*Note(caveat): You might look into modeling this process or even using GDAL to output a *.prj file alongside the output for use in Arc, as the outputs I've seen from this thus far contain no projection definition readable by Arc. If you're sticking with QGIS, tho, then you should be good-to-go.
One more thing, as with any QGIS/GRASS/GDAL processes, ensure you have downloaded the OSGeo4W Installer which ensures you have everything up-to-date:
http://trac.osgeo.org/osgeo4w/
Hope this helps.
answered Jan 2 '13 at 7:42
Bryce TouchstoneBryce Touchstone
34729
34729
2
r.reclass only accepts integers
– nickves
Apr 3 '13 at 23:26
add a comment |
2
r.reclass only accepts integers
– nickves
Apr 3 '13 at 23:26
2
2
r.reclass only accepts integers
– nickves
Apr 3 '13 at 23:26
r.reclass only accepts integers
– nickves
Apr 3 '13 at 23:26
add a comment |
With the Advanced Interface option of the toolbox, I use the Reclassify Grid Values from the SAGA GIS, It a really intuitive tool with options of reclassification by single value, range and using a table.
I prefer this over the r.reclass because you do not have to create additional files.
add a comment |
With the Advanced Interface option of the toolbox, I use the Reclassify Grid Values from the SAGA GIS, It a really intuitive tool with options of reclassification by single value, range and using a table.
I prefer this over the r.reclass because you do not have to create additional files.
add a comment |
With the Advanced Interface option of the toolbox, I use the Reclassify Grid Values from the SAGA GIS, It a really intuitive tool with options of reclassification by single value, range and using a table.
I prefer this over the r.reclass because you do not have to create additional files.
With the Advanced Interface option of the toolbox, I use the Reclassify Grid Values from the SAGA GIS, It a really intuitive tool with options of reclassification by single value, range and using a table.
I prefer this over the r.reclass because you do not have to create additional files.
answered May 2 '14 at 13:42
Marlon CalispaMarlon Calispa
12417
12417
add a comment |
add a comment |
I was able to reclassify a raster using the raster calculator
Here the "Habitat" raster is reclassed from continuous values (0-1) to discrete values of 1,2,3
("Habitat@1" < 0.3)* 1 + (("Habitat@1" >= 0.3) AND ("Habitat@1" < 0.6)) *2 + ("Habitat@1" >=0.6)* 3
add a comment |
I was able to reclassify a raster using the raster calculator
Here the "Habitat" raster is reclassed from continuous values (0-1) to discrete values of 1,2,3
("Habitat@1" < 0.3)* 1 + (("Habitat@1" >= 0.3) AND ("Habitat@1" < 0.6)) *2 + ("Habitat@1" >=0.6)* 3
add a comment |
I was able to reclassify a raster using the raster calculator
Here the "Habitat" raster is reclassed from continuous values (0-1) to discrete values of 1,2,3
("Habitat@1" < 0.3)* 1 + (("Habitat@1" >= 0.3) AND ("Habitat@1" < 0.6)) *2 + ("Habitat@1" >=0.6)* 3
I was able to reclassify a raster using the raster calculator
Here the "Habitat" raster is reclassed from continuous values (0-1) to discrete values of 1,2,3
("Habitat@1" < 0.3)* 1 + (("Habitat@1" >= 0.3) AND ("Habitat@1" < 0.6)) *2 + ("Habitat@1" >=0.6)* 3
edited Oct 4 '17 at 3:49
PolyGeo♦
53.8k1781245
53.8k1781245
answered Nov 30 '16 at 5:26
knussearknussear
8113
8113
add a comment |
add a comment |
The easier way is to use GRASS (also using the QGIS/GRASS plugin) and the r.reclass module.
You will need to create a reclassification rule file, where you can use the keyword "through" or the wildcard "*" to reclassify multiple values in one rule.
Do you know what a reclass table file should look like for the GRASS tool?
– DPSSpatial
Feb 8 '13 at 21:36
2
Sure: grass.osgeo.org/grass64/manuals/r.reclass.html
– Giovanni Manghi
Feb 26 '13 at 16:26
That's great - I got it to work and it's really fast ... thanks for this!
– DPSSpatial
Feb 29 '16 at 18:15
add a comment |
The easier way is to use GRASS (also using the QGIS/GRASS plugin) and the r.reclass module.
You will need to create a reclassification rule file, where you can use the keyword "through" or the wildcard "*" to reclassify multiple values in one rule.
Do you know what a reclass table file should look like for the GRASS tool?
– DPSSpatial
Feb 8 '13 at 21:36
2
Sure: grass.osgeo.org/grass64/manuals/r.reclass.html
– Giovanni Manghi
Feb 26 '13 at 16:26
That's great - I got it to work and it's really fast ... thanks for this!
– DPSSpatial
Feb 29 '16 at 18:15
add a comment |
The easier way is to use GRASS (also using the QGIS/GRASS plugin) and the r.reclass module.
You will need to create a reclassification rule file, where you can use the keyword "through" or the wildcard "*" to reclassify multiple values in one rule.
The easier way is to use GRASS (also using the QGIS/GRASS plugin) and the r.reclass module.
You will need to create a reclassification rule file, where you can use the keyword "through" or the wildcard "*" to reclassify multiple values in one rule.
answered Dec 9 '11 at 12:07
Giovanni ManghiGiovanni Manghi
3,593920
3,593920
Do you know what a reclass table file should look like for the GRASS tool?
– DPSSpatial
Feb 8 '13 at 21:36
2
Sure: grass.osgeo.org/grass64/manuals/r.reclass.html
– Giovanni Manghi
Feb 26 '13 at 16:26
That's great - I got it to work and it's really fast ... thanks for this!
– DPSSpatial
Feb 29 '16 at 18:15
add a comment |
Do you know what a reclass table file should look like for the GRASS tool?
– DPSSpatial
Feb 8 '13 at 21:36
2
Sure: grass.osgeo.org/grass64/manuals/r.reclass.html
– Giovanni Manghi
Feb 26 '13 at 16:26
That's great - I got it to work and it's really fast ... thanks for this!
– DPSSpatial
Feb 29 '16 at 18:15
Do you know what a reclass table file should look like for the GRASS tool?
– DPSSpatial
Feb 8 '13 at 21:36
Do you know what a reclass table file should look like for the GRASS tool?
– DPSSpatial
Feb 8 '13 at 21:36
2
2
Sure: grass.osgeo.org/grass64/manuals/r.reclass.html
– Giovanni Manghi
Feb 26 '13 at 16:26
Sure: grass.osgeo.org/grass64/manuals/r.reclass.html
– Giovanni Manghi
Feb 26 '13 at 16:26
That's great - I got it to work and it's really fast ... thanks for this!
– DPSSpatial
Feb 29 '16 at 18:15
That's great - I got it to work and it's really fast ... thanks for this!
– DPSSpatial
Feb 29 '16 at 18:15
add a comment |
I guess my post doesn´t aswer the question accurately, but it could maybe provide some help. I haven´t found a simple way to do this in QGIS, like Bryce I use GRASS modules. However, if have ArcGIS but no Spatial Analyst, there´s another great tool: GME (http://www.spatialecology.com/gme/). It´s dependent on ArcGIS and R and has a multitude of really great features, one of them beeing 'reclassify'. Here, just like in GRASS, you need to create a text file containing the class definitions. I´ve used ArcMap to visualize the raster in question in different ways first to get a better idea of what the data looks like. Then I´ve defined the new classes based on that info. Its worked like a charm for me. I don´t know if GME will run on a system without ArcGIS, I´d be curious to know.
add a comment |
I guess my post doesn´t aswer the question accurately, but it could maybe provide some help. I haven´t found a simple way to do this in QGIS, like Bryce I use GRASS modules. However, if have ArcGIS but no Spatial Analyst, there´s another great tool: GME (http://www.spatialecology.com/gme/). It´s dependent on ArcGIS and R and has a multitude of really great features, one of them beeing 'reclassify'. Here, just like in GRASS, you need to create a text file containing the class definitions. I´ve used ArcMap to visualize the raster in question in different ways first to get a better idea of what the data looks like. Then I´ve defined the new classes based on that info. Its worked like a charm for me. I don´t know if GME will run on a system without ArcGIS, I´d be curious to know.
add a comment |
I guess my post doesn´t aswer the question accurately, but it could maybe provide some help. I haven´t found a simple way to do this in QGIS, like Bryce I use GRASS modules. However, if have ArcGIS but no Spatial Analyst, there´s another great tool: GME (http://www.spatialecology.com/gme/). It´s dependent on ArcGIS and R and has a multitude of really great features, one of them beeing 'reclassify'. Here, just like in GRASS, you need to create a text file containing the class definitions. I´ve used ArcMap to visualize the raster in question in different ways first to get a better idea of what the data looks like. Then I´ve defined the new classes based on that info. Its worked like a charm for me. I don´t know if GME will run on a system without ArcGIS, I´d be curious to know.
I guess my post doesn´t aswer the question accurately, but it could maybe provide some help. I haven´t found a simple way to do this in QGIS, like Bryce I use GRASS modules. However, if have ArcGIS but no Spatial Analyst, there´s another great tool: GME (http://www.spatialecology.com/gme/). It´s dependent on ArcGIS and R and has a multitude of really great features, one of them beeing 'reclassify'. Here, just like in GRASS, you need to create a text file containing the class definitions. I´ve used ArcMap to visualize the raster in question in different ways first to get a better idea of what the data looks like. Then I´ve defined the new classes based on that info. Its worked like a charm for me. I don´t know if GME will run on a system without ArcGIS, I´d be curious to know.
answered May 27 '14 at 13:12
GISinHelsinkiGISinHelsinki
1236
1236
add a comment |
add a comment |
Raster calculator is your best bet if you don't like grass interface
add a comment |
Raster calculator is your best bet if you don't like grass interface
add a comment |
Raster calculator is your best bet if you don't like grass interface
Raster calculator is your best bet if you don't like grass interface
answered Dec 5 '17 at 11:31
LuffydudeLuffydude
8011021
8011021
add a comment |
add a comment |
QGIS now has two native raster reclassify algorithms
Reclassify by layer - allows you to use a vector layer to dictate your ranges
Reclassify by table - works much like ArcGIS raster reclassify spatial analyst tool.
These were added in QGIS 3.2 see the change log here.
add a comment |
QGIS now has two native raster reclassify algorithms
Reclassify by layer - allows you to use a vector layer to dictate your ranges
Reclassify by table - works much like ArcGIS raster reclassify spatial analyst tool.
These were added in QGIS 3.2 see the change log here.
add a comment |
QGIS now has two native raster reclassify algorithms
Reclassify by layer - allows you to use a vector layer to dictate your ranges
Reclassify by table - works much like ArcGIS raster reclassify spatial analyst tool.
These were added in QGIS 3.2 see the change log here.
QGIS now has two native raster reclassify algorithms
Reclassify by layer - allows you to use a vector layer to dictate your ranges
Reclassify by table - works much like ArcGIS raster reclassify spatial analyst tool.
These were added in QGIS 3.2 see the change log here.
answered yesterday
Phil BarlowPhil Barlow
665
665
add a comment |
add a comment |
protected by Midavalo♦ Mar 2 '17 at 22:07
Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?
The other way is using Raster Calculator. It explains in this entry hub.qgis.org/issues/7581
– user26155
Jan 24 '14 at 3:02
1
You link to a page that describes a workaround and states "the workaround is awful"!
– whuber♦
Jan 24 '14 at 17:49
The best solution I found is in this thread: gis.stackexchange.com/questions/121532/reclass-in-qgis
– DPSSpatial
Feb 25 '16 at 20:16