[GRASS-user] OS MasterMap to GRASS

GRASS GRASS user
1

Hello all,
This is very newbieish but I just can't find an answer out there. I've got Ordnance Survey MasterMap data in GML format downloaded from EDINA. Is there a nice way to load and display this data in GRASS? Or has anyone come across a step-by-step guide to doing this on the web?
all the best
David

2

Hi,

This is very newbieish

perhaps you may want to consider also the option to load/display the
data using Quantum GIS, then if you need GRASS you can access it trough
the GRASS QGis plugin.

cheers

-- Giovanni --

3

David wrote:

This is very newbieish but I just can't find an answer out
there. I've got Ordnance Survey MasterMap data in GML format
downloaded from EDINA. Is there a nice way to load and
display this data in GRASS? Or has anyone come across a
step-by-step guide to doing this on the web?

Sure, GML is a vector format known to OGR,
  http://www.gdal.org/ogr/ogr_formats.html

so you can import it with the v.in.ogr module.

see http://grass.osgeo.org/wiki/Importing_data

good luck,
Hamish

4

it works! well almost...
Thanks, I worked through each tile returned from MasterMap using v.in.ogr I now have a number of separate vector layers making up my map. No labels or colours - is this right?
Can I combine tiles to a single layer or is this not advised?
Looking forward to linking with R where I do know what I'm doing!
D

-----Original Message-----
From: Hamish [mailto:hamish_b@yahoo.com]
Sent: Tue 23/03/2010 05:16
To: grass-user@lists.osgeo.org; Leedal, David
Subject: Re: [GRASS-user] OS MasterMap to GRASS

David wrote:

This is very newbieish but I just can't find an answer out
there. I've got Ordnance Survey MasterMap data in GML format
downloaded from EDINA. Is there a nice way to load and
display this data in GRASS? Or has anyone come across a
step-by-step guide to doing this on the web?

Sure, GML is a vector format known to OGR,
  http://www.gdal.org/ogr/ogr_formats.html

so you can import it with the v.in.ogr module.

see http://grass.osgeo.org/wiki/Importing_data

good luck,
Hamish

5

David wrote:

it works! well almost...
Thanks, I worked through each tile returned from MasterMap
using v.in.ogr I now have a number of separate vector
layers making up my map. No labels or colours - is this
right?

depends on what OGR knows. bug generally that is not entirely unexpected.
You can add those things back with v.colors and the various v.db.*
modules for label attributes. (without knowing the format I'm just
guessing)

If OGR doesn't already, it would be nice if one day it did pass those as
attributes so GRASS could pick them up.

Can I combine tiles to a single layer or is this not advised?

if you like. see v.patch. of course it is easier to work with 100mb
files than 2gb files...

Looking forward to linking with R where I do know what I'm doing!

if you haven't already found it:
  http://grass.osgeo.org/wiki/R_statistics

Hamish