On Jul 31, 2007, at 9:47 AM, Michael Barton wrote:
Kirk,
Your method #1 is straightforward and should go fast. Do you need
all 100
columns?
Thanks Michael. Yes, I am afraid that I need all 100, if only because
I am not sure that I won't someday!
A 3rd way is to make sure that the file has a column to serve as a
"category/cat" field (integer), save it as a dbf file from Excel
and use
v.in.db to create the points. This has the advantage that you can
name the
fields more easily. You would then need to reproject it into UTM.
With this approach how would reproject to UTM? I assume you have read
the dbf file into a lat lon location. Right? However, then I would
need to move the data from the lat lon location to the UTM location.
I'd be a little nervous about trying to convert from latlon to UTM
within a
database. GRASS has routines specially designed to do accurate
reprojection.
This actually works pretty well using the PostGIS extensions on
PostgrSQL (you can use db.connect to point grass to a pg database
rather than the default dbf). There is a very useful tutorial written
by Regina Obe´
http://www.bostongis.com/?content_name=postgis_tut03#30
Michael
On 7/30/07 1:59 PM, "Kirk Wythers" <[EMAIL PROTECTED]> wrote:
__________________________________________
Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University
phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton
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