hello i’m starting using grass and i would like to know which kind of maps i can use, i only have sone images “*.tif” and grass can’t open them. Please i don’t know what does raster and vector means, and i don’t know where to find the maps of my country i need for my project.
Thanks so much.
On 28-Jun-06, at 6:27 PM, Ana Isabel Rodríguez wrote:
hello i'm starting using grass and i would like to know which kind of maps i can use, i only have sone images "*.tif" and grass can't open them. Please i don't know what does raster and vector means, and i don't know where to find the maps of my country i need for my project.
Hi Ana,
Raster - is a term the usually means image or digital photographs. Vector - is a way of drawing shapes, like line or polygons or even just individual points. Your TIFF files are a type of raster data. I don't have GRASS handy, but you will need to use a raster import function.
There are some global datasets that likely cover your country (what country is it?). Tell us more and maybe someone else on this mailing list will have your answer.
Good luck,
Tyler
------
My blog: http://spatialguru.com
My book: http://oreilly.com/catalog/webmapping
Hello Ana,
On Wed, 28 Jun 2006 20:27:25 -0500 Ana Isabel Rodríguez
<kidoki42@hotmail.com> wrote:
hello i'm starting using grass and i would like to know which kind of
maps i can use, i only have sone images "*.tif" and grass can't open
them. Please i don't know what does raster and vector means, and i
don't know where to find the maps of my country i need for my project.
For a starting point you could have a look at the GRASS6 tutorial at[1].
Another good search point is the GRASS-wikipage[2].
Hope this gets you started.
Best
Stephan
[1] http://www.gdf-hannover.de/lit_html/grass60_v1.2_en/index.html
[2] http://grass.gdf-hannover.de/wiki/GRASS_Help
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2006/6/28, Ana Isabel Rodríguez <kidoki42@hotmail.com>:
hello i'm starting using grass and i would like to know which kind of maps i
can use, i only have sone images "*.tif" and grass can't open them. Please i
don't know what does raster and vector means, and i don't know where to find
the maps of my country i need for my project.
Ana,
To import tiff images, you canuse r.in.gdal (just use 'r.in.gdal help'
for a small explanation of the arguments). However, you have to be
sure that all files are in the same projection (use gdalinfo for that,
and reproject with gdalwarp if needed)
Good starting point for brazilian data:
http://www.ibge.gov.br/servidor_arquivos_geo/
http://www.relevobr.cnpm.embrapa.br/conteudo/projeto.htm
World data (elevation data, satelite images, etc...)
http://www.glcf.umiacs.umd.edu
Also, be sure to browse grass.itc.it and the list achives, there is
gold in there!!
best regards,
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