Re: [GRASS-user] Use of r.mode
Hi there, I have created a raster file from r.mode. It's a big image (is true) and it might me heavy but I'm not being able to get r.info information... In a 4GB RAM memory machine I have r.info raster and after 9 minutes It didn't printed anything. So I'm not being able to retrieve information from this raster. Any suggestion? Shall I create a copy of this file? and is this normal? Thanks Monica On Thu, Oct 21, 2010 at 11:32 AM, Monica Buescu monicabuescu1...@gmail.comwrote: Well, that's not good. Yes, maybe a problem with disk space or memory? l'll have to leave to someone more knowledgeable to answer here. Thanks Micha Probaby in this case is Memory space. Because for Smaller images I don't get any problem and bigger images I'm getting this problem. As anyone experienced such a problem? (GRASS takes too long to display an image or apply r.mapcalc? ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Use of r.mode
Well, that's not good. Yes, maybe a problem with disk space or memory? l'll have to leave to someone more knowledgeable to answer here. Thanks Micha Probaby in this case is Memory space. Because for Smaller images I don't get any problem and bigger images I'm getting this problem. As anyone experienced such a problem? (GRASS takes too long to display an image or apply r.mapcalc? ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Use of r.mode
Hello About 20,000,000 cells. That should be OK. Do you know how many different values are actually in the data? Yes... In this case is 6608. In other examples it can be 3000 or 2000. Why? I'd try two things here. First can you change to a smaller region and rerun r.mode and try to display the results? Yes. It worked with a much smaller image. Second: the result of r.mode is a reclass of the original values. So I suppose it has to be recalculated each time you want to display. You can make that reclass map into a permanent raster by running: r.mapcalc output2 = output1 I tried this and after 15 minutes running I gave up. Can this be related with memory restrictions? Thanks Micha for your help Micha ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Use of r.mode
On 20/10/2010 12:18, Monica Buescu wrote: Hello About 20,000,000 cells. That should be OK. Do you know how many different values are actually in the data? Yes... In this case is 6608. In other examples it can be 3000 or 2000. Why? Just to understand how complex the calculation of r.mode has to be. I'd try two things here. First can you change to a smaller region and rerun r.mode and try to display the results? Yes. It worked with a much smaller image. Ah, good. Second: the result of r.mode is a "reclass" of the original values. So I suppose it has to be recalculated each time you want to display. You can make that reclass map into a permanent raster by running: r.mapcalc "output2 = output1" I tried this and after 15 minutes running I gave up. Can this be related with memory restrictions? Well, that's not good. Yes, maybe a problem with disk space or memory? l'll have to leave to someone more knowledgeable to answer here. If you just let it run for longer will it finish? ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Use of r.mode
Greetings This new topic is related with I need to calculate mode for a base map that is composed by float values. r.mode base=b...@permanent cover=1107...@permanent output=saida And I get: ERROR: reading r.stats output ERROR: No rules specified This means that I'm not being able to apply this function just because my base map is a Float. Any ideas of how to fix this? Thanks Monica ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Use of r.mode
Monica Buescu wrote: Greetings This new topic is related with I need to calculate mode for a base map that is composed by float values. r.mode base=b...@permanent cover=1107...@permanent output=saida And I get: ERROR: reading r.stats output ERROR: No rules specified This means that I'm not being able to apply this function just because my base map is a Float. Any ideas of how to fix this? How about r.mapcalc base_integer=int(base) ? The base map should be integer (category ) values, where the mode is calculated for all cells with the same cat value, so it indeed should be an integer raster. Thanks Monica This mail was received via Mail-SeCure System. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user This mail was received via Mail-SeCure System. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Use of r.mode
Hi Mich Thanks for the reply. I think it has worked but everytime I try to open, my winGRASS goes bananas. Just to sum what I have done 1- Import a xyz ASCII file that is a float with a range of [166297.00 - 20855944.0] (not all values are used) and Rows: 4655 ;Columns: 4520 . 2- I did r.mapcalc int() to this file that gets the range of [166297 20855944]. QUESTION: can I apply int to a FLoat with values as big as this? 3- I did r.mode base=int_base coverage= 1107...@permanent (it's a high-resolution image) output=output1 Ok it runs (it takes some time as expected) Thern if I try to display it freezes... Even If I just try r.info output1 it also freezes. Any thoughts aboutt this? (Thanks Micha) On Tue, Oct 19, 2010 at 2:14 PM, Micha Silver mi...@arava.co.il wrote: Monica Buescu wrote: Greetings This new topic is related with I need to calculate mode for a base map that is composed by float values. r.mode base=b...@permanent cover=1107...@permanent output=saida And I get: ERROR: reading r.stats output ERROR: No rules specified This means that I'm not being able to apply this function just because my base map is a Float. Any ideas of how to fix this? How about r.mapcalc base_integer=int(base) ? The base map should be integer (category ) values, where the mode is calculated for all cells with the same cat value, so it indeed should be an integer raster. Thanks Monica This mail was received via Mail-SeCure System. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user This mail was received via Mail-SeCure System. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Use of r.mode
On 10/19/2010 04:03 PM, Monica Buescu wrote: Hi Mich Thanks for the reply. I think it has worked but everytime I try to open, my winGRASS goes bananas. Hope you get some whipped cream with that ;-) Just to sum what I have done 1- Import a xyz ASCII file that is a float with a range of [166297.00 - 20855944.0] (not all values are used) and Rows: 4655 ;Columns: 4520 . About 20,000,000 cells. That should be OK. Do you know how many different values are actually in the data? 2- I did r.mapcalc int() to this file that gets the range of [166297 20855944]. QUESTION: can I apply int to a FLoat with values as big as this? An integer raster is represented by 32 bit signed integer values i.e. from (about) -2 billion to +2 billion. So you're OK here. 3- I did r.mode base=int_base coverage= 1107...@permanent (it's a high-resolution image) output=output1 Ok it runs (it takes some time as expected) Thern if I try to display it freezes... Even If I just try r.info http://r.info output1 it also freezes. I'd try two things here. First can you change to a smaller region and rerun r.mode and try to display the results? Second: the result of r.mode is a reclass of the original values. So I suppose it has to be recalculated each time you want to display. You can make that reclass map into a permanent raster by running: r.mapcalc output2 = output1 Then try displaying the output2. Any thoughts aboutt this? (Thanks Micha) On Tue, Oct 19, 2010 at 2:14 PM, Micha Silver mi...@arava.co.il mailto:mi...@arava.co.il wrote: Monica Buescu wrote: Greetings This new topic is related with I need to calculate mode for a base map that is composed by float values. r.mode base=b...@permanent cover=1107...@permanent output=saida And I get: ERROR: reading r.stats output ERROR: No rules specified This means that I'm not being able to apply this function just because my base map is a Float. Any ideas of how to fix this? How about r.mapcalc base_integer=int(base) ? The base map should be integer (category ) values, where the mode is calculated for all cells with the same cat value, so it indeed should be an integer raster. Thanks Monica This mail was received via Mail-SeCure System. ___ grass-user mailing list grass-user@lists.osgeo.org mailto:grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user This mail was received via Mail-SeCure System. This mail was received via Mail-SeCure System. -- Micha Silver Arava Development Co. +972-52-3665918 http://www.surfaces.co.il ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
