|
Posted by Mississippi Dan on January 6, 2007, 8:07 am
Please log in for more thread options
> I'm looking for a GIS package that can take a map made of
> colored lines and
> draw a layer of colored polygons on top of it so that all
> the green lines are
> covered by green polygons and blue lines are covered by
> blue polygons, etc.
>
> Here's a small example:
> This image shows the original map with about 20 lines in 6
> colors:
> http://i130.photobucket.com/albums/p276/Tom8192/lines.png
> In the new map, I only need 8 polygons with the same 6
> colors to cover all 20
> lines:
> http://i130.photobucket.com/albums/p276/Tom8192/polygons.png
> Lighter colors can cover darker colors but not the other
> way around. Polygons
> can also cover whitespace since there is an implicit giant
> white polygon
> covering the entire map. The goal is to have as few
> polygons as possible.
>
> I need to run this coversion 3 or 4 times per day as the
> lines change their
> colors and then subtract the new polygon file from the old
> one to get a map
> with only the polygons that have been added, deleted, or
> changed.
>
> Does anyone know of any package that can do this? I've
> tried looking at the
> major ones like ESRI, MapInfo, Manifold, etc. but the
> number of products and
> features is just so overhelming that it's virtually
> impossible to tell if any
> of them has this one simple polygon grouping function
> which is really the only
> function I need.
>
> --Tom.
I use the three applications you mention. ESRI at work;
Manifold and GM on home computer. Using Manifold or ArcMap,
you could write a script to do this kind of task.
Best,
Dan
| 
XML Sitemap