[GRASS-user] Compiling NVIZ / OpenGL with nVidia drivers
Hi, Perhaps more a general Linux question than a specific grass one, but does anyone know how to compile GRASS with OpenGL and NVIZ support? I am running Ubuntu 9.04 with the proprietary nVidia drivers for my graphics card. Whenever I try to install OpenGL it breaks my nVidia settings. NVIZ works fine when I download the binary in a pre-compiled version of grass. So far, I can only get grass to compile with --without-opengl. Thanks John -- Dr John Stevenson Postdoctoral Research Associate School of Earth, Atmospheric and Environmental Sciences Williamson Building University of Manchester Manchester M13 9PL UK tel. +44(0)161 306 9360; 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
[GRASS-user] Compiling addons - description.html
Hi, When compiling addons, how do I make the description.html file that comes with the addon be installed as the help page that loads with g.manual? Currently, I am getting a short page with just the commands as generated by g.parser. e.g. in grass-addons/raster/r.denoise, or r.surf.volcano sudo make MODULE_TOPDIR=/usr/local/grass-6.5.svn sudo make MODULE_TOPDIR=/usr/local/grass-6.5.svn install Cheers John -- Dr John Stevenson Postdoctoral Research Associate School of Earth, Atmospheric and Environmental Sciences Williamson Building University of Manchester Manchester M13 9PL UK tel. +44(0)161 306 9360; 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
[GRASS-user] Open Source GIS Meeting - Nottingham University - Monday
Is anyone else on the list going to this? I'm giving a presentation in the afternoon: From ASCII files to orthophotos: The processing of high- resolution aerial survey data using open source GIS software. High quality maps are an important tool in volcanology. In August 2007 the NERC Airborne Research and Survey Facility (ARSF) mapped the Nesjavellir region in Iceland's Western Volcanic Zone. LiDAR, aerial photos and multispectral infrared data were collected with the purpose of surveying the Nesjahraun, a lava flow that was erupted there approximately 2000 years ago and which exhibits complex and varied surface textures. To allow maximum flexibility for the end user, only low-level processing was carried out by NERC. The remaining processing was carried out using open source tools, mainly GRASS, GMT, GDAL and gstat to generate higher level products. The command-line interface of these tools allows tight integration with standard text- and file- manipulation tools that are built into the GNU/Linux operating system and lends itself easily to the creation of scripts for the batch processing of multiple files. The LiDAR data were provided as 6.5 Gb of ASCII text containing information on the location and intensity of each laser return. A preliminary DEM was prepared by binning the data onto a 10 m grid in GRASS. For more detailed work, the LiDAR points were interpolated onto a 1 m grid by kriging using the gstat software in combination with GRASS. This high-resolution DEM was used to orthorectify the aerial photos and multispectral infrared data by providing both ground control points and a topographic model. The rectified photos were formatted for printing in GMT to produce hard-copy maps while false-colour composite images were made by combining different bands of the multispectral infrared data in GRASS. GRASS was also used to digitise roads and other features from the orthophotos and to plot measurements made in the field. Conversion of the format and projection via the GDAL software allows visualisation of much of the data in Google EarthTM. The article outlines the GRASS modules and other software tools used to generate high-level datasets from ARSF data, as a workflow template. It also demonstrates that open source software is a viable and cost-effective alternative to proprietary software in analysis of GIS data. 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] i.rectify: how to make it works?!?!?
Enrico Graziani wrote: Hello! I'm trying to use imagery tools to georeference/rectify an image taken from google earth... Here's the procedure I've used without success: - From GEarth saved image to a local file (jpeg) ( I've tried to convert this jpeg to png but this didn't helped me. In both case I've keeped the image as 24 bit...) - Created a location wgs84 utm29 (North!) with region coordinate taken from GEarth (in local format) - Created a location xy in grass (6.2.3) with region as big as the picture - Imported the image with g.in.gdal: this creates 3 raster maps, blue green and red - r.composite the 3 rasters to one gearth raster - i.group to create group group containing the gearth raster - i.target giving target the wgs84 utm29 location (mapset user) - i.points to give 3 GCPs (- tried also to run i.group to remove the gearth raster from r.composite and add the 3 rgb rasters map) - i.rectify -a group=group input=group extension=_rect order=1 Everything goes fine till here, except for the fact that if I add the -c option to i.rectify it will always fail with error while writing to temp file. However, when I go to other location the map doesn't display. If I've rectified the 3 rgb rasters I can try to display the map with an RGB layer or creating a single raster map with r.composite but, first of all, it takes forever (running top while doing this displayed a 99% of CPU use by d.rgb or r.composite) and, last but not last, the map doesn't display. If I select on the map display zoom to selected map it will zoom to default region (the selected region in this location) even if I used i.rectify without the -c flag! Worster if I try to rectify the r.composited raster (the one containing the 3 imported channel) first and then rectify it. Everything goes ok but if I try to display it grass just stuck and I need to restart the x server to quit the grass windows... I had a look at the data in the wgs84_utm29 location and noticed that this last r.composited raster hasn't been converted. Data in the cell directory is around 24 kb and there is a 148 kb file in the cell_misc/$RASTER_NAME directory .. starting jpeg was a couple of MBs.. Stranger in the other case (rectifying the 3 channels and then displaying rgb layer or r.composite them): the files in the cell directory are around 15 kb and 148 kb in the cell_misc folders, but after r.composite, the raster coming from this has 6.9 MB in the cell folder and 107.3 MB in the cell_misc folder of data. All the files I'm talking about in the cell misc folder are called null and dolphin recognized them by the MIME type as jpeg2000, but gwenview isn't able to display them... My configuration is the installation of the GRASS Live DVD coming from the Trento University in a VMWare machine running with VMPlayer 2.0.5 on Debian Etch. This live should be Kubuntu Hardy ( ?) based. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user For a quick georeferencing, with just 3 gcps, you can just use gdal. gdal_translate -a_srs EPSG:4326 -of GTiff -gcp x1 y1 X1 Y1 -gcp x2 y2 X2 Y2 -gcp x3 y3 X3 Y3 gearth.jpg gearth.tif gdalwarp -t_srs EPSG:4326 -rc gearth.tif gearth_rectified.tif Then load the image with r.in.gdal. You can get the gcps by hovering the mouse over landmarks in The Gimp (x,y) and Google Earth (X,Y). You can find the EPSG code for your utm region here: http://www.epsg-registry.org/ 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
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
[GRASS-user] r.patch, images vs coloured elevation data, aerial photo mosaic
Hi, I have two questions, first a specific one, secondly a more general one. 1) I have some aerial photos that I want to mosaic. I am able to do this with r.patch. However, the photos only cover about half of the region. In the remainder of the region, I would like to show a shaded relief map as a background to give context to the photos. When I include the shaded relief map in the list to patch, it comes out as varying shades of red. My question is therefore, what do I have to do to the shaded relief map to turn it into an 'rgb image' that I can include in r.patch. 2) More generally, what is the best way of converting a good-looking map into a georeferenced image e.g. by converting the elevation data into rgb pixel colour data. Currently I would use d.out.file then gdal_translate, but that is dependent on the screen resolution. 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] r.patch, images vs coloured elevation data, aerial photo mosaic
Nikos Alexandris wrote: On Mon, 2009-02-16 at 11:35 +, John Stevenson wrote: Hi, I have two questions, first a specific one, secondly a more general one. 1) I have some aerial photos that I want to mosaic. I am able to do this with r.patch. However, the photos only cover about half of the region. In the remainder of the region, I would like to show a shaded relief map as a background to give context to the photos. When I include the shaded relief map in the list to patch, it comes out as varying shades of red. My question is therefore, what do I have to do to the shaded relief map to turn it into an 'rgb image' that I can include in r.patch. Do you really want to patch the shaed relief map along with the orthophotos in one map? What about r.blend? If you insist on patching, then, I think, you would need to create 3 new versions of your shaded map which will correspond to R(ed), G(reen) and B(lue), rescale them to 0,255 (r.rescale). Then you patch them with the R, G and B mosaic's of the orthophotos and compose (r.composite) an RGB map. I would expect the shaded part to look grey-scaled since you will have the same pixel value in all of the R, G and B layers. But I am 100% sure that it will work. Thanks Nikos, In the end, I made a composite from the original shaded relief: r.composite red=nesja_shade green=nesja_shade blue=nesja_shade levels=32 output=elev_shade_comp then patched it with the photos: r.patch input=p43_trimmed,p44_trimmed,p33_trimmed,elev_shade_comp output=aerial This gave me coloured aerial photos where the data exist, and a grey shaded relief map where they don't. 2) More generally, what is the best way of converting a good-looking map into a georeferenced image e.g. by converting the elevation data into rgb pixel colour data. Currently I would use d.out.file then gdal_translate, but that is dependent on the screen resolution. What about d.out.file in=YourMap out=YourMap resolution=2 # or resolution=4 ? Good point. Cheers John Kind regards, Nikos -- 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] Appropriate use of v.surf.rst (lidar data)
Wesley Roberts wrote: Dear Grass Users, I am having trouble with interpolating a canopy height model using v.surf.rst and some lidar data. The lidar point density ranges from 5 - 8 points per meter squared. I know I can import the data using r.in.xyz but I would prefer to use an interpolation technique as opposed to a spatial average. I chose r.surf.xyz based on the paper written by Helena Mitasova, Lubos Mitas, and Russell S. Harmon. While the applications differ the use of a large data set with many points means dealing with the same issues. I ran the algorithm using default values and the result was a smooth moon-like surface not really approximating a plantation forest canopy (see link 2) v.surf.rst input=areaone_4...@wesley layer=1 zcolumn=dbl_3 elev=Area1_4_def tension=40. segmax=40 npmin=300 dmin=0.05 dmax=0.25 zmult=1.0 Given that I am working with very dense data with a high number of points I then ran the algorithm with a smaller tension value (roughly 2.5) with an incrase in the maximum number of points per segment (decrese computation time) and I find that the interpolation is blocky in nature. (see link 3) v.surf.rst input=areaone_4...@wesley layer=1 zcolumn=dbl_3 elev=Area1_4_def6 tension=2.5 smooth=0.0001 segmax=100 npmin=300 dmin=0.05 dmax=0.25 zmult=1.0 Is the blockiness related to the increase in the maximum number of points in a segment i.e. segmax value? I have also been looking at using R to do the interpolation using gstat or automap. Does anyone on the list have any advice with regards to methods to use for the interpolation of lidar canopy returns, with a view to creating a 3-D model of the canopy. The website spatial-analyst (http://spatial-analyst.net) suggests the use of regression-kriging but I don't have any ancillary data besides height and intensity. I have uploaded pics of the study area and interpolation results to flickr (everyone should have access to these) Link 1 http://www.flickr.com/photos/35273...@n07/3271646498/ Link 2 http://www.flickr.com/photos/35273...@n07/3270854029/ Link 3 http://www.flickr.com/photos/35273...@n07/3270904761/ Many thanks for taking the time to read my post and for your valuable contributions Wesley (I am using Grass 6.3.0 on Ubuntu Hardy Heron) Wesley Roberts MSc. Researcher: Earth Observation (Ecosystems) Natural Resources and the Environment CSIR Tel: +27 (21) 888-2490 Fax: +27 (21) 888-2693 To know the road ahead, ask those coming back. - Chinese proverb Hi Wesley, I've tried various methods for processing LiDAR data. I have a few comments: 1) Play with the resolution of your map and try different settings. 2) r.in.xyz does give good results, so don't rule it out for first approximation, and to help decide the resolution that you need. 3) r.surf.nnbathy might do the trick, but I haven't tried it. 4) If I want to interpolate to a higher resolution that my data covers, I usually krige in gstat. I found that easier than learning how to use R on top of everything else. The examples on p348-353 of the GRASS Book are easily adapted to your own data. (http://www.springerlink.com/content/j21632/) Note that the default method calculates a global variogram, which can take a long time with LiDAR data. The examples on p53-54 of the gstat manual describe how you can limit the analysis to a local neighborhood or set a maximum number of points to include in each calculation and thus dramatically speed up the interpolation. (http://www.gstat.org/gstat.pdf) Later 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
[GRASS-user] r.neighbors, wide filtering
Hi, For my research, I am testing a mesh denoising algorithm on topographic data. It smooths the surfaces much like using r.neighbors method=average or r.neighbors method=median, and, depending on settings, gives similar results to r.neighbors when size 5. The advantage of the algorithm is that it has some ability to preserve features. In cases where more significant smoothing is necessary (r.neighbors size 5) it is much better at preserving minimum and maximum elevations etc as it converges on a stable solution for the smoothed landscape. My question relates to understanding in which cases is it necessarily to smooth to such an extent? From what I have seen e.g. taking speckle out of SRTM DEMs, smoothing by such extremes removes a lot of useful information and results in unrealistic surfaces. Has anyone come across a situation/dataset or type of analysis where they need to smooth with r.neighbors (method=average/median, size 5)? I would be interested to know, and to see if this algorithm would be useful. 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; [EMAIL PROTECTED] ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Tips for setting up an new FOSS-GEO-linux-box
Hi, I have some other tips for the setting up of a box. I came as a new user to both GRASS and Linux at the same time so perhaps these tips would help people in a similar situation. Instructions to install a load of GIS software on Ubuntu can be found here: http://www.perrygeo.net/wordpress/?p=119 If you are working on a dual boot system, with Windows NTFS and Linux, and the main data are stored on the NTFS partition, then you need to mount it with yourself as the owner to be able to work on it in GRASS. The following entry in the /etc/fstab works: /dev/sda3 /media/Windows ntfs-3g umask=0002,uid=YOUR_LOGIN,gid=YOUR_GROUP,allow_other 00 I got most of my packages from the repositories, but installed the following from source: gstat (http://www.gstat.org/) - Calculate variograms and interpolate by kriging liblas (http://liblas.org/) - Read and write LiDAR data in LAS format Cheers John ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] How to install Grass into Ubuntu
Hi Matt, I'm using Grass on a dual-boot Vista/Xubuntu 7.10 machine. It's mine, so my data live on the NTFS partition and I can mount it with me as the owner (and group). It took me a while to figure it out, and now I can't remember how I did it, but my fstab entry looks like this: /dev/sda3 /media/OS ntfs-3g umask=0002,uid=mbessjs3,gid=mbessjs3,allow_other 00 Hopefully that works for you, too. John Matt B wrote: On Thu, Oct 23, 2008 at 1:14 AM, Glynn Clements [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] wrote: Matt B wrote: Note that GRASS won't let you select a mapset as the current mapset (where new files are stored) unless you own it. Write permission isn't sufficient. If you are creating a location which is to be shared by multiple users, you either need to create a mapset directory for each user, owned by the user, or grant all such users write permission on the location directory so that they can create their own mapset directory (which they will own). Thanks for the heads up on this Glynn, my problem is that I'm on a dual boot system and I'm storing mapsets/data on an NTFS drive. It's being automatically mounted with the owner set as root and read/write permission for everyone. If I put the data on the ext3 filesystem, it works. I'll mess around with fstab and mount the data drive as the appropriate user. Having said that it does seem to me that this sort of check is doubling up. File permissions are usually run by the file system/OS. While having a sanity check for read/write access is a good idea, checking for ownership seems a little over the top. insert newby user disclaimer here. AFAICT, the check exists because otherwise people grant group-write permission to mapset directories without fully understanding the consequences. In particular, you can end up being unable to modify, rename or remove files because they reside in a directory created by another user and lacking group-write permission. The possibility of free-for-all filesystems (i.e. where not only are all files and directories world-writable, but where any new files and directories will always be world-writable) has only arisen recently. The native Windows builds skip the ownership check, but Unix builds will perform it regardless of the filesystem type. Unfortunately, I don't know of any (robust and portable) way to detect when a Windows filesystem is being used on Unix. -- Glynn Clements [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] After banging my head against the ntfs wall for a little while here (for some reason the guys who write the ntfs stuff also have some ideas on who should be allowed to mount / own filesystems and block devices). While writing software for the lowest common denominator isn't necessarily a bad thing, including this sort of thing in the software to stop people overwriting others files does seem a little redundant and in my case annoying. I'll add another disclaimer in case someone points out that theres an easy fix for this as I'm the guy who can't get an ntfs partition mounted without it being owned by root (without recompiling stuff that would probably break on the next apt-get update). I'll be running this from my somewhat smaller ext3 partition for the time being unless someone can point me at a don't do this check button (please, someone point me at that button). Matt ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user -- 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; [EMAIL PROTECTED] ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] gstat in a latlon location / exit+reenter grass from a script
Hi, I am using gstat within grass to calculate variograms. It works very well in UTM locations, but now I need to use it in a lat-long location, which it doesn't support. I am trying to think of a way round this and decided on the following strategy: 1- export the data to a text file (r.stats -1g) 2 - reproject the data in the text file to UTM (cs2cs) 3 - use gstat to calculate the variogram of the text file This method works, provided that I run gstat outside of GRASS. However, I would now like to run these calculations from a batch file. I can imagine two ways of doing this, and these are my questions: Option 1: Trick gstat so that it thinks that it is running outside of GRASS so that it will let me input my data from a text file. I tried unsetting some of the GRASS variables but this didn't work. Is there a way that I can do this? Option 2: Get my shell script to exit from GRASS, run the gstat commands, then return to GRASS where it left off. Is this way possible? Alternatively, if I could get GRASS to run commands as if from another shell then that may work, too. 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; [EMAIL PROTECTED] ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] SRTM data aliases in UTM
Hi, I have imported some tiles of 1 arcsecond SRTM data into GRASS 6.3 using r.in.srtm into a lat-long region. Whenever I import them to a UTM region, res=30, I get aliasing problems. This results in a grid of lines of jumps in elevation running through my data. This happens when I use r.proj. I have also tried generating a text file of UTM coordinates via r.stats -1g, and cs2cs. Importing this as a raster or vector, and interpolating with r.surf.rst or v.surf.rst also give aliasing errors. What is the best way round this? Importing at a higher resolution? How much higher? My ultimate aim is to compare the SRTM with LiDAR data, so if possible I would like to use an exact interpolation where possible. 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; [EMAIL PROTECTED] ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] nnbathy
Hi, I am keen to try r.surf.nnbathy, but I cannot find the nn libraries online. The link given in the instructions: http://www.marine.csiro.au/~sak007 is dead. Does anyone know where I can get them from now? Cheers John ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Making and Uploading Maps for Garmin Etrex Legend GPS - v.net.salesman
Thanks to everyone for their help so far. It seems like this is much less straightforward than I had expected. I've looked into some of the options e.g. QLandkarte, cGISmapper and tried to upload a ready-made .img file but had problems with the port speed (I'm using a usb/serial converter to connect to the GPS). As I am most interested in loading up my road data, I thought about putting them on as tracks. I exported the vector map to kml, then used gpsbabel to convert to .gpx format. I then edited this by hand to name the tracks and join all the parts into track segments. Unfortunately when it loads up, all the segments get joined together so that the end of one road jumps onto the start of the next. I think that either gpsbabel or my etrex don't support that feature. So now I have a new plan: is it possible to use v.net.salesman to export a single track that covers every road in my network and doubles back on itself to return to the start? If so, can someone give me some pointers on how to do it - I'm still getting to grips with the vector format and don't really have a clue where to start. Thanks, John Tom Russo wrote: On Thu, Aug 07, 2008 at 10:12:08AM -0700, we recorded a bogon-computron collision of the [EMAIL PROTECTED] flavor, containing: I see some room for confusion here. I think on Garmins the basemaps built-in maps are not vector format but raster format .img files. So the short answer is you can't dump them on the way you're trying to, you need to convert them. Try looking at cgpsmapper and GPSMapEdit. Neither is open source, but both work under WINE on linux. There's a Linux build of cgpsmapper, too. These tools will let you create maps for your Garmin GPS from various vector data (with a lot of work). See: http://home.cinci.rr.com/creek/garmin.htm for a walk through the process and links to the tools. Since you've already imported your GPX files from gpsbabel into GRASS, you can just export them as shapefiles for reading into GPSMapEdit. GPSMapEdit will read shapefiles, but it's a bit of a chore to get it Just Right.There is talk about making an OGR output format that can handle the Polish format used by cgpsmapper, but it ain't there yet. I'm not aware of any other tool than GPSMapEdit that can write Polish format from shapefiles. HTH, T. John C. Tull wrote: I've used gpsbabel for moving points, tracks, and routes to/from a Garmin GPSV. http://www.gpsbabel.org John On Aug 7, 2008, at 5:17 AM, John Stevenson wrote: I have digitised some points, roads and a lake in GRASS and would like to be able to upload them onto my Garmin Etrex Legend. I have been able to use v.out.ogr format=kml to output the points, and can upload them to the GPS with gpsbabel. However, I would like the roads and the lake to be loaded into the built-in maps. I read a post on the GRASS mailing list archive that mentioned cGPSmapper, but it seems like this only works with ESRI shape files (v.out.ogr again) if you have one of the paid-for versions. Is there any open source software that can do this? Can GRASS export in a format that can be more easily converted to be compatible with the GPS? ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Making and Uploading Maps for Garmin Etrex Legend GPS
I have digitised some points, roads and a lake in GRASS and would like to be able to upload them onto my Garmin Etrex Legend. I have been able to use v.out.ogr format=kml to output the points, and can upload them to the GPS with gpsbabel. However, I would like the roads and the lake to be loaded into the built-in maps. I read a post on the GRASS mailing list archive that mentioned cGPSmapper, but it seems like this only works with ESRI shape files (v.out.ogr again) if you have one of the paid-for versions. Is there any open source software that can do this? Can GRASS export in a format that can be more easily converted to be compatible with the GPS? Thanks John ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Georectify problem
Moritz Lennert wrote: On 30/07/08 02:00, Adam Dershowitz wrote: The problem that I am running into is that only the middle half or so of the jpg is being rectified. Do I have to set some region or something to get it all to work? Yep, exactly. AFAICT, the georectify tool calls i.rectify with the -c flag (line 1366 of gui/tcltk/gis.m/georect.tcl), which means Use curr. region settings in target location. So you need to set the correct location in the target location. I'm not sure I understand why this is so. It would seem to be more intuitive to run without that flag and thus have i.rectify determine the smallest window which covers the image, because otherwise the user has to identify target region extents manually... Michael, any special reason for using -c ? Maybe this could be made into an option ? I went through exactly the same problem this week on my first attempts on the georectify tool, and also wondered why it it chose those region settings. I updated the wiki page last night to highlight the need for a suitable region. Also, sometimes I found that it crashed when the target region was completely wrong because one of the intermediate stages was taking s=0 w=0 and I was working in UTM with typical values of 40 and 710 and a resolution of 2 m. The resulting map must have been huge. In the end I calculated the region that I would need manually and worked out the resolution from the number of pixels in the scanned image. Does i.rectify calculate these, or if not, is that something that could be easily added? Later John ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Compile add-ons instructions?
Hi, Are there any instructions on the wiki or elsewhere on how to compile Add-Ons? I am using Grass 6.3.0 which I compiled from source and have downloaded the Add-Ons via SVN repository. I would like to compile the i.landsat.acca module, but there is no configure file. How do I do it? Do I have to recompile all of Grass with some extra configuration options? Cheers, John ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
