Re: [GRASS-user] calculating average value over a base map
Hi Dmistrij I think it was worked. I just need to figure out something with r.statistics. Thanks Monica ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] calculating average value over a base map
Monica,
I did similar things on slope values...have a look to the following code
snippet:
r.mapcalc slope_mult=int(slope*1000.0)
r.stats -nN input=slope_mult | awk '{print $1=$1 $1/1000}' | r.reclass --o
input=slope_mult output=slope_labeled
r.statistics --o -c base=base_map cover=slope_labeled method=average
output=slope_avg
r.mapcalc slope_avg_cval=int(@slope_avg*1000)/1000.0
Perhaps it may help you...
Regards,
Christian.
From: Monica Buescu
Sent: Tuesday, March 01, 2011 11:40 AM
To: Dmitrij Kolesov ; GRASS user list
Subject: Re: [GRASS-user] calculating average value over a base map
Hi Dmistrij
I think it was worked. I just need to figure out something with r.statistics.
Thanks
Monica
___
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grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user
___
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http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] calculating average value over a base map
Monica, try to use r.statistics with the average function/method. Pass you maps through the cover= and base= parameters... Christian. From: Monica Buescu Sent: Monday, February 28, 2011 4:27 PM To: GRASS user list Subject: [GRASS-user] calculating average value over a base map Greetings I have a map with values and a base map created with r.clump. How can I calculate the average of values that falls inside each cluster defined by r.clump? Thanks Best regards, Monica ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] calculating average value over a base map
Greetings Christian Unfortunely it only works with CELL values. For instance, r.median uses more than just CELL. Is there any other alternative? Beucase for mode and median there is specific functions. Thamls Best regards, Monica On Mon, Feb 28, 2011 at 3:55 PM, Christian Schwartze christian.schwar...@uni-jena.de wrote: Monica, try to use r.statistics with the average function/method. Pass you maps through the cover= and base= parameters... Christian. *From:* Monica Buescu monicabuescu1...@gmail.com *Sent:* Monday, February 28, 2011 4:27 PM *To:* GRASS user list grass-user@lists.osgeo.org *Subject:* [GRASS-user] calculating average value over a base map Greetings I have a map with values and a base map created with r.clump. How can I calculate the average of values that falls inside each cluster defined by r.clump? Thanks Best regards, Monica -- ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] calculating average value over a base map
If you want to deal with raster value types other than CELL, you can use the –c flag in r.statistics in order to process the labels. Therfore, you have to copy your cat values to the category labels first... Regards, Christian. From: Monica Buescu Sent: Monday, February 28, 2011 5:16 PM To: Christian Schwartze Cc: GRASS user list Subject: Re: [GRASS-user] calculating average value over a base map Greetings Christian Unfortunely it only works with CELL values. For instance, r.median uses more than just CELL. Is there any other alternative? Beucase for mode and median there is specific functions. Thamls Best regards, Monica On Mon, Feb 28, 2011 at 3:55 PM, Christian Schwartze christian.schwar...@uni-jena.de wrote: Monica, try to use r.statistics with the average function/method. Pass you maps through the cover= and base= parameters... Christian. From: Monica Buescu Sent: Monday, February 28, 2011 4:27 PM To: GRASS user list Subject: [GRASS-user] calculating average value over a base map Greetings I have a map with values and a base map created with r.clump. How can I calculate the average of values that falls inside each cluster defined by r.clump? Thanks Best regards, Monica -- ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] calculating average value over a base map
Hello Christian. I believe I didn't quite understand what you have said but I think that is not the way. My basemap is a r.clump output in CELL format that ranges from 1 til 1700 or something my cover map is NDVI that ranges from -1 (near) til 1 (near) and is a FCELL. My Objective. calculate for each clump, the average of NDVI pixels If I do: r.statistics -c base=new_clump cover=2007_ndvi method=average I get: ERROR: This module currently only works for integer (CELL) maps Is there any alternative to do this? Thank you Christian and the rest of grass mailing list Monica On Mon, Feb 28, 2011 at 5:08 PM, Christian Schwartze christian.schwar...@uni-jena.de wrote: If you want to deal with raster value types other than CELL, you can use the –c flag in r.statistics in order to process the labels. Therfore, you have to copy your cat values to the category labels first... Regards, Christian. *From:* Monica Buescu monicabuescu1...@gmail.com *Sent:* Monday, February 28, 2011 5:16 PM *To:* Christian Schwartze christian.schwar...@uni-jena.de *Cc:* GRASS user list grass-user@lists.osgeo.org *Subject:* Re: [GRASS-user] calculating average value over a base map Greetings Christian Unfortunely it only works with CELL values. For instance, r.median uses more than just CELL. Is there any other alternative? Beucase for mode and median there is specific functions. Thamls Best regards, Monica On Mon, Feb 28, 2011 at 3:55 PM, Christian Schwartze christian.schwar...@uni-jena.de wrote: Monica, try to use r.statistics with the average function/method. Pass you maps through the cover= and base= parameters... Christian. *From:* Monica Buescu monicabuescu1...@gmail.com *Sent:* Monday, February 28, 2011 4:27 PM *To:* GRASS user list grass-user@lists.osgeo.org *Subject:* [GRASS-user] calculating average value over a base map Greetings I have a map with values and a base map created with r.clump. How can I calculate the average of values that falls inside each cluster defined by r.clump? Thanks Best regards, Monica -- ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
