I've read here at there that GRASS is particularly good at raster, and
people wondering whether they should use raster or vector. I'm a GRASS
and GIS newbie, and I'm confused: I thought that whether you use raster
or vector depends on the type of the data, not your preferences. I
thought that the DEM would be raster, and that roads and streams would
be vector. Do you mean I can represent roads in raster? How the heck?
They'll be collections of points, not lines, and I won't be able to
specify the width I want with ps.map.
What exactly do I not get?
Antonios Christofides wrote:
I've read here at there that GRASS is particularly good at raster, and
people wondering whether they should use raster or vector. I'm a GRASS
and GIS newbie, and I'm confused: I thought that whether you use raster
or vector depends on the type of the data, not your preferences. I
thought that the DEM would be raster, and that roads and streams would
be vector. Do you mean I can represent roads in raster? How the heck?
They'll be collections of points, not lines, and I won't be able to
specify the width I want with ps.map.
Whilst it is more usual to represent roads, rivers etc as vectors, it
is possible to convert them to rasters. The choice of format
determines what type of processing you can do; e.g. you can use
r.buffer, r.cost etc on a raster representation.
Using vectors provides greater accuracy, but there are more processing
options for rasters.
--
Glynn Clements <glynn.clements@virgin.net>