Nikos Alexandris wrote:
If I am not wrong even under @rc-gis the .prj is required to work properly.
No, the .prj is not required but without it the dataset's coordinate system
is undefined.
The .prj file for a shapefile is in WKT (well known text) format, and generally
the coordinate system details should be easily identifiable.
- These thoughts are mine alone! -
Andrew MacIntyre Operations Branch
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-Original Message-
From: grass-user-boun...@lists.osgeo.org [mailto:grass-user-
boun...@lists.osgeo.org] On Behalf Of Nikos Alexandris
Sent: Friday, 18 June 2010 10:39 AM
To: grass-user@lists.osgeo.org
Subject: Re: [GRASS-user] Import, project
(Apologies for the interference...)
Hamish:
you have to create a GRASS Location for each source map projection,
then
pull them all into the target Location with r.proj or v.proj.
But in my (apparently very naive) view I this is completely not the point.
If I have to use esri anyway then why bother taking data into grass ??
There are several reasons why one can/should use grass. Long discussion. To
make the long story short, there are links which might be of your interest [1]
[2][3].
If you are convinced that F(L)OSS is the way to go, then you have a
*STRONG*
reason to stick with grass and/or other open geo-spatial tools.
What I would think is this: If I can find out the projection/coordinates
etc of the shapefile by any manual means then this info MUST BE included
in the shapefile itself. Along with the actual geodata.
I think these infos are not integrated in the file.
More so the import-program within grass cannot import even a single byte
without thorough knowledge of the imported format, but i seems that it
can
only read objects but not their coordinate-system.
grass-gis (in its entirety) is strict and clean, an honest friend which you
can rely on, discuss, learn and find the way.
So: If all the info is already in the shapefile there then why
1) do I have to manually find it by some way outside grass and
2) why doesn't the import-program simply read that info from the file, read
the coordinates and projection from the current location and the call the
appropriate projection-program to reproject the imported file to fit the
current location.
All the infos (proj/coord/bounds/etc) of import and target are there (says
the naive man :-)
It would useful/helpful to feed the list with the actual information
(filenames for example) that are beforehand. If those are there (as separate
files, which is the way they should exist) then it should fairly easy and
strait to import the data clean(ly) in grass' database.
, the sequence of operations is completely obvious and
always exactly the same and yet everything has to be done manually.
If I want to recode a moviefile to another format I tell the encoder what I
want to have as an output and the encoder then looks by itself what
format
the original has. What is different about geodata ?
I don't really mind doing that for one map. But somehow I expect lots more
maps from different sources being added later and each one causing lots of
work. What is it I don't understand here?
3) how to export an ascii/excel/csv-list of every raster-point with a)
the corresponding scalar and b) the administrative region and c) the
coordinates lat/long of the raster-point
r.out.xyz, or r.to.vect + v.out.ascii
maybe with some other custom magic along the way.
Thanks, that sounds promising. I will try ASAP.
from the command line GDAL's ogr2ogr and gdalwarp can reproject
shapefiles and GeoTiffs etc directly.
Tried that (on ubuntu) :
u...@nb ~ $ gdalwarp file1.shp file1.out
ERROR 4: `file1.shp' not recognised as a supported file format.
and: gdalwrap --formats lists 88 formats including a few from esri, but no
shapefile.
hint: check the output of ogrinfo --formats
(
gdal is a library of tools that handle raster data [4]. ogr tools are for
vector stuff [5].
)
Good luck, Nikos
---
[1] http://grass.osgeo.org/intro/firsttime.php
[2] http://www.gnu.org/philosophy/categories.html
[3] http://www.dwheeler.com/oss_fs_why.html
[4] http://www.gdal.org/ and http://www.gdal.org/gdal_utilities.html
[5] http://www.gdal.org/ogr/ and
http://www.gdal.org/ogr_utilities.html
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