v.to.rast

[Chris C Rewerts]

>Date: Wed, 26 Aug 92 18:55:56 EST
>From: SBALL at ucs.indiana.edu
>X-To: WINS%"grassu-list at amber.cecer.army.mil"
>Subject: v.to.rast
>
>I am digitizing some small archaeological sites in Vanderburgh County,
>IN which are not being converted into raster cells in the v.to.rast 
>module.  When I go back and enlarge the site in v.digit it is converted.
>Is there any way outside of artificially enlarging the sites that I can
>have these small sites converted by v.to.rast?  Currently all my map 
>layers are based on a 30m square cell size.
>Thanks,
>Stephen Ball
>

Stephen:

How large are these areas (in meters)? Could be they are too small for
v.to.rast to covert to an area in a 30 meter resolution, especially if
they are less than 900 sq m in size - there may not be enough area
for v.to.rast to justify calling that cell the given class.

If that is the case, you could:

1. Use a smaller resolution for your raster maps. If you can't justify
the size it would take to store the raster map at the higher
resolution for your default region size, then perhaps
you could use sub-regions to create small patch maps focused on
the areas with the small areas of interest.

2. If you don't want to change resolution to a smaller dimension,
then you could digitze the locations of the areas as sites instead of areas.


Chris Rewerts        rewerts at ecn.purdue.edu
Agricultural Engineering, Purdue University