[GRASSLIST:216] Re: [GRASS5] Built-in vector documentation extended

[Thomas Adams]

Michael,

This is very helpful and answers many questions I have about the new 
vector format, especially points. I do want to confirm my understanding 
from "Vector data processing in GRASS GIS" (please pardon my being 
obtuse). So…

In order to get a Postgres table consisting of point coordinates and 
various attributes to import into my lat-long location using v.in.db, I 
had to put a "1" in the field for the "category column name (string 
required)"; when I put "lid" in the field, I got an error saying the 
type was not an integer. It seems GRASS is expecting a string for the 
field name that has integer as its type. My problem is that none of my 
fields meet this requirement for the key field, the only column that 
does, "lid", has type string.

Now, my question is, for 5030 records, how do I add an integer key 
field? My guess is that I would have to write a script that (1) created 
a new column (type integer) for the Postgres table and (2) looped, 
sequentially filling the new field for each record with a unique integer 
value — or I could drop the table, and do all of this outside of the 
Postgres/GRASS environment and reload the table. The problem I have with 
doing either is that the table design is not my own and is controlled by 
'outsiders'.

Regards,
Tom

Michael Barton wrote:
> Markus,
>
> This is very helpful. It will make learning GRASS vector architecture much
> easier for people.
>
> Michael
> __________________________________________
> Michael Barton, Professor of Anthropology
> School of Human Evolution and Social Change
> Arizona State University
> Tempe, AZ 85287-2402
>
> phone: 480-965-6213
> fax: 480-965-7671
> www: http://www.public.asu.edu/~cmbarton
>
>
>
>   
>> From: Markus Neteler <neteler at itc.it>
>> Date: Thu, 16 Mar 2006 22:35:22 +0100
>> To: grass developers list <grass5 at grass.itc.it>
>> Cc: GRASS user list <grasslist at baylor.edu>
>> Subject: [GRASS5] Built-in vector documentation extended
>>
>> Hi,
>>
>> I have extended the vector overview document in
>> 6.1-CVS, find also here:
>>
>>  http://grass.itc.it/grass61/manuals/html61_user/vectorintro.html
>>
>> While it covers most modules, each now in a thematic
>> context, it may be fine tuned, improved.
>> Text pieces welcome (preferably CVS patches).
>>
>> The idea is to give a short overview.
>>
>> Currently the page is even W3 conformant :-)
>>
>> Cheers
>>
>>  Markus
>>
>>     
>
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>   


-- 
Thomas E Adams
National Weather Service
Ohio River Forecast Center
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