[GRASS-user] how to import e00 data
nik at nikosalexandris.net
Wed Nov 20 07:21:47 PST 2013
Simone Gabbriellini wrote:
> Hello List,
> this is my first attempt with Grass,
Have a nice ride with GRASS GIS :-). Invest some time, it'll "payback"
multiple times. As a starter, it is advised to warm-up with some stuff over
First thing you need to do in any case, is to set-up a location based on the
spatial reference system of the data you plan to work with.
Check some stuff here: <http://grass.osgeo.org/grass64/manuals/helptext.html>
and here: <http://grasswiki.osgeo.org/wiki/Importing_data>.
> I am trying to visualize administrative boundaries of India... I am trying
> to load e00 files that I downloaded from
So, GRASS GIS has its own vector (and raster) formats. You need to import the
data first in GRASS' data base.
> Now, I really cannot understand how to import these data.
For "e00" files, there is a module called "v.in.e00". The help/manual pages
You need to use this module in order to get the data of interest inside GRASS'
> I don't understand the coordinates type of these data, thus I do not know
> what to specify when Grass starts.
I had a quick look. The data are "nailed" in geographic coordinates. The
"ESPG" code for the "WGS84" reference system is "4326". You need to define a
new grass location based on the "EPSG:4326". There are also other ways to do
that, not only the epsg-code.
> The error message I have is:
> WARNING: Datum <Not_specified_based_on_Clarke_1866_ellipsoid> not
> recognised by GRASS and no parameters found
> ERROR: Projection of dataset does not appear to match current location.
> I know this is not much information, but really I have no clue of what
> I have to do in order to display these data, so any hint/advice on
> best practice about how to proceed will be more than welcome.
After importing, set the active region to match the extent of the data (you
imported/you want to display, edit, et.c.):
"g.region vect=ImportedData" in the command line.
> Best regards,
Give it a try, report back if things don't roll.
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