It depends on what you mean by "merge".
v.patch is the "official" tool to merge two vectors, but you could use
v.overlay (option=or).
Richard
On 24/09/10 10:56 PM, Thom DeCarlo wrote:
Richard,
Thanks! That was exactly the information I needed.
Now to figure out how to merge layers...
Thom
/Sent via DROID on Verizon Wireless/
-----Original message-----
*From: *Richard Chirgwin <[email protected]>*
To: *[email protected]*
Sent: *2010 Sep, Thu, 23 07:20:51 GMT+00:00*
Subject: *Re: [GRASS-user] Connecting GRASS to a MySQL database?
On 23/09/10 5:13 PM, [email protected] wrote:
> Message: 3
> Date: Wed, 22 Sep 2010 16:51:08 -0400 (EDT)
> From: PixelPusher
> Subject: [GRASS-user] Connecting GRASS to a MySQL database?
> To:[email protected]
> Message-ID:
> Content-Type: text/plain; charset=UTF-8; format=flowed; delsp=no
>
> Sorry for the n00bish question, but I'm confused by the GRASS
on-line
> docs.
>
> I have a MySQL database running on my local computer. Let's say
that the
> MySQL user name is TRD and he has access to a database called
TRD where
> I want to store my StateBoundaries table.
>
> I can start the GRASS (6.4.0) Python interface and select
> "Database->Manage Databases->Connect" from the pulldown menu. I
am then
> faced with the choice of driver, where I select "mysql". But,
then it
> needs the Database name. This is where I get lost. The string in the
> text field says, "$GISDBASE/$LOCATION_NAME/$MAPSET/TRD". I'm not
sure
> where GRASS is getting the values that substitute for those
things that
> look like script variables. I guess the "$LOCATION_NAME" and
"$MAPSET"
> come from the location and mapset that I selected when GRASS
started.
> But, where is "$GISDBASE" set?
>
> I also step through the log in process by setting the
appropriate user
> name and password. I know that I can use this combination to
access the
> MySQL database through its command line interface.
>
> The next thing I do is try to test the connection. However, this
results
> in lots of errors like, "Cannot connect to MySQL, Access denied for
> user" and "ERROR: Unable to open database
> <$GISDBASE/$LOCATION_NAME/$MAPSET/TRD>". It looks like GRASS is not
> using the right username and password and not doing the variable
> substitution that I was expecting.
>
> Can anoyone give me some hints on how to get this thing started?
>
> Thanks!
> Thom
Thom,
Having taught a few people how to use Grass-GIS, I can say that
database parameters confuse a great many of them!
The parameters you see are for the default dbf driver (Grass-GIS
uses this driver as the default for any new mapset). For MySQL,
you provide the database location, and also login.
So where you see the $GISDBASE/$LOCATION_NAME/$MAPSET/dbf/ string,
you want:
database=host=,dbname=TRD
But you'll also have to login. Eg (command line):
db.login user=TRD password="somepassword"
(the inverted commas are needed at the command line but not using
the GUI)
Notes:
1. From now on, every map you make in this particular mapset will
use the MySQL database as its default connection. Don't try to mix
different database drivers within a mapset - you'll get a headache!
2. Database parameters are stored only within the mapset you're
using. If you want to connect a different mapset to MySQL, you
have to set its connection.
Richard Chirgwin
_______________________________________________
grass-user mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/grass-user
_______________________________________________
grass-user mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/grass-user
