Re: [GRASS-user] SOLVED: How to implement 2D lookup table?
On Friday, May 24, 2013, Glynn Clements wrote: Rainer M. Krug wrote: Hmm - sounds interesting, but also for other purposes. But as the result will be a raster map, I don't think this approach is usable here (unless I can feed the numbers back into a raster map, i.e. the inverse of r.stats -c) r.cross + r.reclass ? There is one aspect in r.cross which makes this approach quite difficult to implement: the value of the result map layer can not easily be traced back to the values of the two input layers: If you only have a small number of classes, you can just create the cross-product manually, e.g.: r.mapcalc 'result = ageClass * 10 + dc' Yes - This is effectively what I am doing now. So a category of 15 would be ageClass=1, dc=5. r.cross is more useful when the total number of pairs which actually occur is much fewer than the product of the numbers of categories, as it only creates a category for each combination which actually occurs, not for each potential combination. True. The problem I have with r.cross is that I have to manually decode afterwords what combination the value refers to. I could use a she'll script to translate the category values, but this sounds a little tedious, especially as the format is not that easily parsable. Cheers, Rainer -- Glynn Clements gl...@gclements.plus.com javascript:; -- NEW GERMAN FAX NUMBER!!! Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany) Centre of Excellence for Invasion Biology Natural Sciences Building Office Suite 2039 Stellenbosch University Main Campus, Merriman Avenue Stellenbosch South Africa Cell: +27 - (0)83 9479 042 Fax:+27 - (0)86 516 2782 Fax:+49 - (0)321 2125 2244 email: rai...@krugs.de Skype: RMkrug Google: r.m.k...@gmail.com ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Getting Started with GRASS Python Scripts
On 23/05/13 22:49, Martin Lacayo wrote: Hello, I am having trouble getting started with GRASS Python scripts. I am using GRASS 6.4 on Debian. Could some provide a basic example of a Python script that imports a raster and exports the same raster? In particular I am interested in seeing the entire setup of a database (locally on disk), location, and mapset from start to finish. Every example I have found starts with an existing database, location, and mapset. I have been able to get past this part by using the GUI, but I need to be able to script their creation. A database is just a directory, so new problem creating that. You can create a new location with g.proj location= and a new mapset with g.mapset -c. But for these commands to work, you need to be in an existing location. IMHU, the easiest is to have a dummy location set up that you can connect to in your script, create the new location and mapset, and then connect to that new location. In theory you could create your own location manually, but that implies creating all the support files (PROJ, DEFAULT_WIND, etc). Have I understood correctly that a database can only contain one projection, which is set when it is first created, and that besides importing and exporting data all processing has to happen with data that is in the database? Yes. You can possibly work with v./r.external, but IIRC that does not give you full topology, so not all all GRASS modules are sure to work as expected (don't know about r.viewshed, though). Is it possible to script the creation of a database (locally on disk), location, and mapset? And how would you remove them afterwards? To remove a location or mapset you just delete the relevant directory. Moritz ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Getting Started with GRASS Python Scripts
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Il 23/05/2013 22:49, Martin Lacayo ha scritto: My ultimate goal is to decrease our development time for our open source ecosystem service tools: http://invest-natcap.googlecode.com, but more specifically at the moment I am trying to use r.viewshed so I do not have to write my own. Why not using GRASS through SEXTANTE for this? In this case you have nothing to do, just call whatever module you need. All the best. - -- Paolo Cavallini - Faunalia www.faunalia.eu Full contact details at www.faunalia.eu/pc Nuovi corsi QGIS e PostGIS: http://www.faunalia.it/calendario -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlGfGNUACgkQ/NedwLUzIr5QQQCcCyEDZmgSjTO2gnRC+Jk5jGRf 1esAmwSA0nx2cNbrRNNBkPtcotrdZvHt =NNfh -END PGP SIGNATURE- ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] r.example
Hi! I'm a newbie to GRASS and would like to do some C programming with its modules. I'm having some troubles putting to work just a simple raster example (r.example)! I'm on a Debian squeeze machine and installed Quantum GIS with the GRASS plug-in. Nevertheless I installed GRASS (version 6.4.0~rc6+42329-3) via Synaptic Package Manager because I just want to use GRASS modules. I checked where it was installed and the grass64 is in usr/bin but many functions are in usr/lib/grass64/bin. From a terminal window I can call GRASS just by typing grass. So far so good. Then, I looked for a simple example for reading a raster file in C and found out about the r.example (although didn't find it in my local installment). So, I downloaded the GRASS source code version 6.4.3RC3 and unzipped it to a folder placed in my Desktop. Now, from a Terminal window, I went to the r.example directory and typed make. Here is the result: pedro@PedroHost:~/Desktop/grass-6.4.3RC3/doc/raster/r.example$ make make: @GRASS_HOME@/dist.@host@/tools/g.echo@EXEEXT@: Command not found make: @GRASS_HOME@/dist.@host@/tools/g.echo@EXEEXT@: Command not found mkdir -p @GRASS_HOME@/bin.@host@ mkdir -p @GRASS_HOME@/dist.@host@/include/grass mkdir -p @GRASS_HOME@/dist.@host@/lib mkdir -p @GRASS_HOME@/dist.@host@/bin mkdir -p @GRASS_HOME@/dist.@host@/etc mkdir -p @GRASS_HOME@/dist.@host@/driver mkdir -p @GRASS_HOME@/dist.@host@/driver/db mkdir -p @GRASS_HOME@/dist.@host@/fonts test -d OBJ.@host@ || mkdir -p OBJ.@host@ /bin/sh: CC@: not found make: *** [OBJ.@host@/main.o] Error 127 Am I doing something wrong, do I need to install anything else or configure something? Best Regards, Pedro Mendonca ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] r.example
Pedro wrote: I'm on a Debian squeeze machine ... installed GRASS (version 6.4.0~rc6+42329-3) (fwiw that is essentially one or two commits away from 6.4.1) Then, I looked for a simple example for reading a raster file in C and found out about the r.example (although didn't find it in my local installment). yes, it's just an example of the source code. So, I downloaded the GRASS source code version 6.4.3RC3 and unzipped it to a folder placed in my Desktop. good, Now, from a Terminal window, I went to the r.example directory and typed make. Here is the result: you'll have to install the build dependencies and run ./configure first, try as root: apt-get build-dep grass then renice +17 -p $$ CFLAGS=-ggdb -march=native -Wall -Werror-implicit-function-declaration \ ./configure \ --with-tcltk-includes=/usr/include/tcl8.5 --with-cairo \ --with-motif --with-python=/usr/bin/python2.6-config \ --with-readline --with-cxx --with-odbc --with-sqlite \ --with-freetype --with-freetype-includes=/usr/include/freetype2 \ --without-postgres --with-proj-share=/usr/share/proj \ --enable-64bit --with-pthread -with-openmp \ --with-wxwidgets=/usr/lib/wx/config/gtk2-unicode-release-2.8 \ --with-geos \ 21 | tee config_log.txt make -j 5 see also the README in the debian/ dir in the source package and http://grasswiki.osgeo.org/wiki/Compile_and_Install_Ubuntu Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] space interpolation of time datasets
Dear all, I need a suggestion. I have 180 point dislocated in europe, at which are a value (gps tropospheric delay) that vary in time (every 2 hours) for several years. I want to interpolate between such points to create a raster map for each temporal istance (one every 2 hours), and then look at the evolution of such parameter in time. Instead, I do not have to integrate data with different time discretization... Do you suggest me to use temporal modules in Grass7? and store such point data in a temporal db? or to use the old dfb? Thanks for your time! Bianca -- Eng. Bianca Federici, PhD Assistant Professor in Geomatics DICCA - Department of Civil, Chemical and Environmental Engineering Laboratory of Geodesy, Geomatics and GIS University of Genoa - Via Montallegro, 1 - 16145 Genova ITALY Phone: +39 010 353 2421 - Fax: +39 010 353 2546 - Academic Center of Savona - Delfino Building Via A. Magliotto, 2 - 17100 Savona ITALY Phone: +39 019 219 45381 - Fax: +39 019 219 45382 - E-mail: bianca.feder...@unige.it - www.dicca.unige.it - The only race that I know is that human - A. Einstein Beginning and end of research is the knowledge - A.M. Manzino - Please consider the environment before printing this email! ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] GRASS7 temporal GIS database questions
Hi Rainer, 2013/5/22 Rainer M. Krug rai...@krugs.de Hi I am doing spatio-temporal simulations with R and GRASS and IO am thinking about using a temporal GIS database to store the resulting raster layers in. But I have a few questions about the temporal GIS database: 1) If I register a raster map in a temporal GIS database via r.register, can I delete the original raster map and the info is stored in the temporal GIS database? Yes, the info is still stored in the temporal database, unless you call t.support with -m option. 2) If 1) is possible, can I extract the raster layer again from the temporal GIS database? No, that's not possible since only the spatio-temporal extent and some metadata is stored in the temporal database. The map data itself will not copied. 3) Summarizing: Is the temporal GIS database a good archiving place for the layers I create during the simulation? If you think that GRASS is a good archiving place then yes. But be aware that a large temporal database with lots of maps with slow down the temporal database access. If you want to store 10.000 maps, then you should use postgresql as temporal database backend. Best regards Soeren Thanks, Rainer -- Rainer M. Krug ___ 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] GRASS7 temporal GIS database questions
Hi Sören Gebbert soerengebb...@googlemail.com writes: Hi Rainer, 2013/5/22 Rainer M. Krug rai...@krugs.de Hi I am doing spatio-temporal simulations with R and GRASS and IO am thinking about using a temporal GIS database to store the resulting raster layers in. But I have a few questions about the temporal GIS database: 1) If I register a raster map in a temporal GIS database via r.register, can I delete the original raster map and the info is stored in the temporal GIS database? Yes, the info is still stored in the temporal database, unless you call t.support with -m option. 2) If 1) is possible, can I extract the raster layer again from the temporal GIS database? No, that's not possible since only the spatio-temporal extent and some metadata is stored in the temporal database. The map data itself will not copied. OK - that is the info I needed. In this case, the spatio temporal database is not an option for me for archiving. 3) Summarizing: Is the temporal GIS database a good archiving place for the layers I create during the simulation? If you think that GRASS is a good archiving place then yes. But be aware that a large temporal database with lots of maps with slow down the temporal database access. If you want to store 10.000 maps, then you should use postgresql as temporal database backend. I was thinking about this - but seting up a postgresql server on a cluster and to maintain it (or bug the administrator to do it) as I am the only one using it, is not an option at the moment - but I'll keep it definitely in mind. Thanks a lot, Rainer Best regards Soeren Thanks, Rainer -- Rainer M. Krug ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user -- Rainer M. Krug pgpylhKi0O8fj.pgp Description: PGP signature ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Getting Started with GRASS Python Scripts
Hello Paolo, Yes, my initial thought was to just use GRASS via SEXTANTE. I tired to do this, but did not have any luck. I posted previously on 14/5/2013 to qgis-users with the subject How to run SEXTANTE algorithms outside of QGIS Python console? but did not get a solution to the problem I encountered, which I thought was related to creating a QGIS instance so that I could make calls to SEXTANTE. If you have any suggestions that would be much appreciated. Thank you, Martin On Fri, May 24, 2013 at 12:37 AM, Paolo Cavallini cavall...@faunalia.it wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Il 23/05/2013 22:49, Martin Lacayo ha scritto: My ultimate goal is to decrease our development time for our open source ecosystem service tools: http://invest-natcap.googlecode.com, but more specifically at the moment I am trying to use r.viewshed so I do not have to write my own. Why not using GRASS through SEXTANTE for this? In this case you have nothing to do, just call whatever module you need. All the best. - -- Paolo Cavallini - Faunalia www.faunalia.eu Full contact details at www.faunalia.eu/pc Nuovi corsi QGIS e PostGIS: http://www.faunalia.it/calendario -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlGfGNUACgkQ/NedwLUzIr5QQQCcCyEDZmgSjTO2gnRC+Jk5jGRf 1esAmwSA0nx2cNbrRNNBkPtcotrdZvHt =NNfh -END PGP SIGNATURE- ___ 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
[GRASS-user] r.viewshed Python Script OSError
Hello, I am using GRASS 6.4 on Debian. I am trying to make a call to r.viewshed from Python, but it fails with the following exception: OSError: [Errno 2] No such file or directory Any suggestions? Thank you, Martin ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
