Matt,
Here are the steps to get your data into GRASS. The learning curve for GRASS is about the same as for ArcView (if you can remember starting from scratch). Knowing ArcView can be helpful and frustrating. You have some idea of what is possible, but the ways to do it are sometimes quite different—but not always. Now that I’ve mastered GRASS many things are much easier than in ArcView, some are harder, and others are just different. Hope this helps.
Michael
Use v.in.ogr (/files/import/vector/various formats using OGR) for the shape files.
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Make sure you are in a location with the correct projection parameters and extents.
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Put the path to directory with the files in the “OGR datasource name” box (path the DIRECTORY only, without the shapefile name).
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Put the new name of the GRASS vector file you want to create in the “name of output vector” field
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Put the name of the shapefile in the “OGR layer name” box WITHOUT the .shp extension. (You can check the List available layers… checkbox at the bottom to see a list of the names)
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You will probably have to check the “Override projection” checkbox because shape files don’t contain projection information (except with new ArcGIS).
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You may want to check the “Extend location extents…” box if the map is bigger than the region you are importing into.
This should work.
Use r.in.gdal for the ArcView grid file. (/files/import/raster/various formats using gdal).
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Browse to the hdr.adf file inside the grid folder (not the info folder) to put in the “Raster file to be imported” box
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Give a name to the new GRASS raster file you are creating
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You may have to check the “Override projections…” checkbox, and may want to check the “Extend location extents…” checkbox
This should import fine.
Once you have imported the files go to g.region (/gis/region/manage region) and set the region to match either of your maps. This makes sure that you are looking at the part of the world where you just imported data.
Use the GIS manager to display your data.
On 1/24/05 3:58 PM, “Matt Sakals” msakals@interchg.ubc.ca wrote:
Hi,
I am still having troubles getting going with GRASS and don’t know where to start. As I see it the big downside to continuous improvement is that the support documents are always out of date. This whole venture is extremely humbling as I am an advanced ArcView user, but can’t get going here.I am trying to import .shp files and ArcView grids, they are projected according to BC Albers (http://srmwww.gov.bc.ca/gis/bceprojection.html)..) I am using GRASS 6.0 beta on OSX, would you be able to help me get off the ground?
Here is a sample data set of data I would like to work with:
Many thanks, it would be great if you can find the time to help me out,
Matt Sakals, PAg, GIT
Sustainable Forest Management Laboratory
University of British Columbia
mailto:msakals@interchg.ubc.ca
http://sustain.forestry.ubc.ca/home.html
785 Dickens St., Trail, BC, V1R 2B7
ph. 250.368.3191
m. 250.231.0951
On 19 Jan 2005, at 22:24, Michael Barton wrote:
On 1/19/05 8:30 AM, “Matt Sakals” msakals@interchange.ubc.ca wrote:
Hi,
I am trying to install GRASS, and have used the GRASS complete download for OS X from http://wwwamb.bologna.enea.it/forgrass/download.htm
but I don’t know if my libraries have been installed; I can’t find a grasslib folder on my computer anywhere.Matt,
If you have run the install program for the grass libraries in Lorenzo Moretti’s GRASS complete, they are probably OK. They are located in /usr/local/grasslib. This is a ‘hidden’ directory on a Mac. You can check it by either…
- Using the terminal program and entering
cd /usr/local/grasslib
ls
- Selecting ‘Go to folder’ from the ‘Go’ menu in the finder. Enter /usr and press ‘Go’
You should be able to navigate to /usr/local/grasslib then.I don’t know if GRASS is working right or not because I am new, but in the tutorial it crashes when trying to import .shp files.
You don’t say which version of GRASS you are using. But I recommend using GRASS 6.0.0beta1. It is posted on my mirror site for Lorenzo’s files. I do NOT recommend using 5.7.0 because it is problematic. GRASS 5.4 is fine also, but 6.0 does more and generally does it more better. You should have no trouble importing a *.shp file using v.in.ogr in GRASS 6.0.
Hope this helps.
Michael
C. Michael Barton, Professor of Anthropology
School of Human Evolution and Social Change
PO Box 872402
Arizona State University
Tempe, AZ 85287-2402
USAPhone: 480-965-6262
Fax: 480-965-7671
www: <www.public.asu.edu/~cmbarton>
Michael Barton, Professor of Anthropology
School of Human Evolution and Social Change
Arizona State University
Tempe, AZ 85287-2402
USA
voice: 480-965-6262; fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton