Re: [GRASS-user] Off Topic: Importing GRASS tiffs to GMT
On 06/04/09 21:27, Patton, Eric wrote: I'll post here before checking on the GMT list; hopefully I can get some answers from a GRASS/GMT guru... I can't help you on your precise questions, but have you seen Dylan's article: http://casoilresource.lawr.ucdavis.edu/drupal/node/561 (see link to pdf on that page) ? Moritz ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Off Topic: Importing GRASS tiffs to GMT
Eric wrote: I'll post here before checking on the GMT list; hopefully I can get some answers from a GRASS/GMT guru... Moritz wrote: I can't help you on your precise questions, but have you seen Dylan's article: http://casoilresource.lawr.ucdavis.edu/drupal/node/561 (see link to pdf on that page) ? and of course the GRASS Wiki: http://grass.osgeo.org/wiki/GMT (which of course forever needs updating) Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Off Topic: Importing GRASS tiffs to GMT
Hamish wrote: Eric wrote: I'll post here before checking on the GMT list; hopefully I can get some answers from a GRASS/GMT guru... Moritz wrote: I can't help you on your precise questions, but have you seen Dylan's article: http://casoilresource.lawr.ucdavis.edu/drupal/node/561 (see link to pdf on that page) ? and of course the GRASS Wiki: http://grass.osgeo.org/wiki/GMT (which of course forever needs updating) Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user By a tiff, do you mean a georeferenced map? I've plotted aerial photos that I rectified in GRASS using the following to export the RGB bands: r.mapcalc image.red=r#image; image.green=g#image; image.blue=b#image r.out.bin -h input=image.red output=image.red.grd r.out.bin -h input=image.green output=image.green.grd r.out.bin -h input=image.blue output=image.blue.grd Followed by: grdimage image.red.grd image.green.grd image.blue.grd -J -R -B ...etc. I've just put the same workflow onto the wiki. I've also used r.his to make coloured shaded relief maps, and plotted them in GMT using the same method. I don't think that it is the optimal method, but at least it preserved my colour rules. Cheers John -- Dr John Stevenson Postdoctoral Research Associate School of Earth, Atmospheric and Environmental Sciences Williamson Building (Room 2.42) University of Manchester Manchester M13 9PL, UK tel. +44(0)161 306 6585; fax. +44(0)161 306 9361; john.steven...@manchester.ac.uk ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Off Topic: Importing GRASS tiffs to GMT
John Stevenson wrote: I've also used r.his to make coloured shaded relief maps, and plotted them in GMT using the same method. I don't think that it is the optimal method, but at least it preserved my colour rules. you might try 'd.out.file format=geotiff' for that Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
RE: [GRASS-user] Off Topic: Importing GRASS tiffs to GMT
By a tiff, do you mean a georeferenced map? I've plotted aerial photos that I rectified in GRASS using the following to export the RGB bands: r.mapcalc image.red=r#image; image.green=g#image; image.blue=b#image r.out.bin -h input=image.red output=image.red.grd r.out.bin -h input=image.green output=image.green.grd r.out.bin -h input=image.blue output=image.blue.grd Followed by: grdimage image.red.grd image.green.grd image.blue.grd -J -R -B ...etc. I've just put the same workflow onto the wiki. I've also used r.his to make coloured shaded relief maps, and plotted them in GMT using the same method. I don't think that it is the optimal method, but at least it preserved my colour rules. Cheers John I had forgotten about r.cpt2grass; thanks for the note, Hamish. I found a posting by Allen Cogbill on the GMT mailing list last night, and with a lot of clunky tweaking, worked for me: 1. Convert the .tif file to a Sun Rasterfile (I use ImageMagick). 2. Use Unix tools to read the .tfw file that accompanies the .tif file and calculate the real-world coordinate extrema. 3. Using g.region or imagemagick's identify, list the number of rows and columns, and along with the image resolution, calculate the N-S-E-W extents. 4. Once real-world extents are known, use your psbasemap mapping scale to calculate image width and height on paper. 5. Pass this information to psimage -W. As long as the region defined in psbasemap's -R flag is identical to the region of the generated tiff from GRASS, the image will plot correctly. John, I was trying to import colored, shaded-relief tiff images using r.out.tiff. For whatever reason, r.out.tiff always preserves my color table as opposed to r.out.gdal. Your solution sounds a lot easier to use than mine; I'll have to try it out - thanks! Regards, ~ Eric. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
RE: [GRASS-user] Off Topic: Importing GRASS tiffs to GMT
Eric: I found a posting by Allen Cogbill on the GMT mailing list last night, and with a lot of clunky tweaking, worked for me: 1. Convert the .tif file to a Sun Rasterfile (I use ImageMagick). [ 2. Use Unix tools to read the .tfw file that accompanies the .tif file and calculate the real-world coordinate extrema. 3. Using g.region or imagemagick's identify, list the number of rows and columns, and along with the image resolution, calculate the N-S-E-W extents. 4. Once real-world extents are known, ] gdalinfo will do all that for you from the geotiff, or from g.region at time of export. beware the dreaded cell-center vs grid-center convention issues. use your psbasemap mapping scale to calculate image width and height on paper. 5. Pass this information to psimage -W. As long as the region defined in psbasemap's -R flag is identical to the region of the generated tiff from GRASS, the image will plot correctly. Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Off Topic: Importing GRASS tiffs to GMT
On Tue, Apr 7, 2009 at 2:58 AM, John Stevenson john.steven...@manchester.ac.uk wrote: Hamish wrote: Eric wrote: I'll post here before checking on the GMT list; hopefully I can get some answers from a GRASS/GMT guru... Moritz wrote: I can't help you on your precise questions, but have you seen Dylan's article: http://casoilresource.lawr.ucdavis.edu/drupal/node/561 (see link to pdf on that page) ? Which of course should be updated and of course the GRASS Wiki: http://grass.osgeo.org/wiki/GMT (which of course forever needs updating) Sigh... on my to-do list, really! By a tiff, do you mean a georeferenced map? I've plotted aerial photos that I rectified in GRASS using the following to export the RGB bands: r.mapcalc image.red=r#image; image.green=g#image; image.blue=b#image r.out.bin -h input=image.red output=image.red.grd r.out.bin -h input=image.green output=image.green.grd r.out.bin -h input=image.blue output=image.blue.grd Followed by: grdimage image.red.grd image.green.grd image.blue.grd -J -R -B ...etc. I've just put the same workflow onto the wiki. I've also used r.his to make coloured shaded relief maps, and plotted them in GMT using the same method. I don't think that it is the optimal method, but at least it preserved my colour rules. Cheers John Yep. This is nealry the same general approach that I use, however- I tend to pipe the output from r.out.bin to xyz2grd. Here is a script with a pile of commands that may be useful to some: http://169.237.35.250/~dylan/temp/where_2.0/template.sh ... note that it could use some updating as well. Cheers, Dylan ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Off Topic: Importing GRASS tiffs to GMT
I'll post here before checking on the GMT list; hopefully I can get some answers from a GRASS/GMT guru... I've exported a tiff from GRASS using r.out.tiff -t, producing a worldfile in the process. I then converted the tiff to an 8-bit Sun raster image using Imagemagick's convert utility (GMT will only import imagery in this format). So far so good, the image looks fine. My question is how do plot the Sun raster so that it is correctly georeferenced on my GMT basemap? The GMT program psimage doesn't have a -R flag with which I may feed it geographical coordinates! And grd2image is only used for gridding xyz data, not for plotting georeferenced images. I already wrote a bash script to extract the upper left coordinates from the worldfile and then convert these positions into GMT-style -R flag like this: Worldfile: 10.000 0.000 0.000 -10.000 710175.000 5418295.000 Output from my script: -54.160355/48.399269/-53.359791/48.860100 But can this information actually be used to imoprt the Sun raster? Sorry for the off-topic post. I know there are a few GMT users in the GRASS community, and maybe they have encountered this problem before. Thanks, ~ Eric. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
