Re: [GRASS-user] log(0)-error in r.mapcalculator

2012-11-09 Thread Patrick S.
Thank you so much, Markus! That was the missing hint and it works now! However, I just went through the documentation, which says: /F/ means that the functions always results in a floating point value and Function log has F. This is somehow misleading and rather should be an *. Can I correct

Re: [GRASS-user] log(0)-error in r.mapcalculator

2012-11-09 Thread Markus Metz
On Fri, Nov 9, 2012 at 9:27 AM, Patrick S. patrick_...@gmx.ch wrote: Thank you so much, Markus! That was the missing hint and it works now! However, I just went through the documentation, which says: F means that the functions always results in a floating point value and Function log has F.

[GRASS-user] How to split raster map by specified rows

2012-11-09 Thread Andranik Hayrapetyan
Hi. I am trying to split raster map into chunks to do calculations (with r.mapcalc) on each chunk separately. I browsed the net and found only the script called r.split.line, which needs vector file to split raster, but this is not that I want. Is there a way to split raster by rows? For example

Re: [GRASS-user] log(0)-error in r.mapcalculator

2012-11-09 Thread Patrick S.
Markus, I understand your arguments, but A is the slope of r.slope.aspect and has floating point values as input for the formula. I just created a testcase to be able to report on the behavior in detail. As you can see below the results are truncated to integer as soon as I add a term to A

Re: [GRASS-user] How to split raster map by specified rows

2012-11-09 Thread Helmut Kudrnovsky
hi Is there a way to split raster by rows? For example if I have a GeoTiff file with 8000 rows I want to split it into 8 files 1000 row per each. r.info (http://grass.osgeo.org/grass64/manuals/html64_user/r.info.html) to get the raster extent g.region

Re: [GRASS-user] How to split raster map by specified rows

2012-11-09 Thread Paulo van Breugel
The function r.tileset ( http://grass.osgeo.org/grass64/manuals/html64_user/r.tileset.html) allows you to split your raster layer in user-defined tiles (which could be a tile of one row). The description states that it produces tilings of the source projection for use in the destination region and

Re: [GRASS-user] How to split raster map by specified rows

2012-11-09 Thread Micha Silver
The gdal_translate utility has a -srcwin option where you can speciify row/col values to clip a raster. If your data is Geotiff to begin with, this would be an easy solution. -- Micha Silver 052-366-5918 -Original message- From: Andranik Hayrapetyan andranik@gmail.com To:

Re: [GRASS-user] Calculate p value for regression slope in r.series

2012-11-09 Thread Glynn Clements
Markus Metz wrote: Just wondering, if it is implemented in r.regression.series, would it be very difficult to port to r.series? Or do the two things function different internally? It could probably be added to r.series quite quickly if someone was willing to provide definitions for

Re: [GRASS-user] log(0)-error in r.mapcalculator

2012-11-09 Thread Glynn Clements
Patrick S. wrote: ###Testcase2: formula= log(((A+1)/100)/(1-(A+1/100))) Note that (A+1/100) = A+(1/100) = A as 1/100 will use integer division. -- Glynn Clements gl...@gclements.plus.com ___ grass-user mailing list

Re: [GRASS-user] Calculate p value for regression slope in r.series

2012-11-09 Thread 王德辉
Thank you Paulo! I think your way is feasible. For r.series, t could be caluclate via R2 using r.mapcalc. I am also a newcomer to time series analysis. Hope r.series may add t,f, p function soon. Best regard, Dehui -原始邮件- 发件人: Paulo van Breugel p.vanbreu...@gmail.com 发送时间:

[GRASS-user] new `g.gui.` modules

2012-11-09 Thread Martin Landa
Hi, yesterday with Anna and Vaclav we added a new module `g.gui.mapswipe` in G7 which allows to launch wxGUI Map Swipe as standalone application. Today I did the same for Graphical Modeler. So currently you can launch the Graphical Modeler also from CLI g.gui.gmodeler or g.gui.gmodeler

[GRASS-user] gui modeler: dynamic variable names

2012-11-09 Thread Moritz Lennert
Hi, I'm experimenting with the gui modeler (thanks for a great tool by the way !) trying to build a very simple model of city growth, starting with a very basic cellula automata style model where the state of each pixel at time t+1 depends the state of its neighborhood at time t. In Python

[GRASS-user] Easy way to patch vector files

2012-11-09 Thread Stephen Sefick
I have two different vectors that I would like to patch together. one doesn't have an attribute table associated with it. The other does. I am having a problem figuring out how to get them to play nicely. At this point It would be easier to just create an attribute table... All help is

Re: [GRASS-user] Calculate p value for regression slope in r.series

2012-11-09 Thread Paulo van Breugel
Great, thanks On Fri, Nov 9, 2012 at 12:28 PM, Glynn Clements gl...@gclements.plus.comwrote: Markus Metz wrote: Just wondering, if it is implemented in r.regression.series, would it be very difficult to port to r.series? Or do the two things function different internally? It

Re: [GRASS-user] Is r.damflood is suitable for grass6.5

2012-11-09 Thread Margherita Di Leo
Hi, On Fri, Nov 9, 2012 at 6:27 AM, SWAPAN GHOSH swap.g...@gmail.com wrote: Thanks to all for helping me. Later I build Grass7 developement environment. At that time I have not much time for research. I can solve my requirement using r.lake and r.hazard.flood command. I would like to point

Re: [GRASS-user] Easy way to patch vector files

2012-11-09 Thread Richard Chirgwin
Stephen - Adding an attribute table to the input map is probably the best thing to do! You can create the patched vector with no attribute table, and add it later - but you'll then have to go back and use other tools to create a table and fetch attributes from the original. cheers, Richard

Re: [GRASS-user] Is r.damflood is suitable for grass6.5

2012-11-09 Thread SWAPAN GHOSH
*Dear madi,* Ok, I know it but according to our requirement we need some customization. We are also focus on psmap flooding scripts. *Thanks Regards,* * * *Swapan* On Sat, Nov 10, 2012 at 1:15 AM, Margherita Di Leo direg...@gmail.comwrote: Hi, On Fri, Nov 9, 2012 at 6:27 AM, SWAPAN GHOSH

Re: [GRASS-user] Calculating Azimuth of Stream Main Channel [RESOLVED]

2012-11-09 Thread Markus Neteler
On Thu, Nov 8, 2012 at 5:34 PM, Rich Shepard rshep...@appl-ecosys.com wrote: ... Thanks for pointing this out to me. It's one of the hidden gems in GRASS not visible from the one-line descriptions in the module list. Yes - this is why I still think that the manual should be upgraded: make