The simplify tag has no wiki summary.
18
votes
10answers
2k views
What are the existing solutions to automate generalisation/simplification of geographical data?
I am looking for existing solutions (softwares, libraries, methods, etc.) to automate the generalisation/simplification of geographical data as presented there, and also there.
How do you proceed ...
10
votes
4answers
2k views
Simplifying polygons to linestring
I would like to simplify some polygons that represent rivers into linestrings. I assume that holes in polygons can be omitted. Anybody has some good idea how to simply do it?
It would be nice, if it ...
18
votes
5answers
967 views
Simplifying geometries (generalization)
What are the recommended ways of simplifying geometries? Keeping in mind projections, and simplifying state geometries for example.
I've heard about converting to an 'equi-distant' projection that ...
11
votes
4answers
2k views
Simplifying adjacent polygons
I encountered a problem simplifying set of polygons that are adjacent. If I simplify each polygon separately with the Douglas–Peucker algorithm (which is used by many open source tools), the resulting ...
4
votes
2answers
1k views
Simplify Raster Contours ArcGIS 10
Does anybody know a way to simplify a number of contour polylines derived from a raster dataset? I need to generate a map that shows contour polylines at relatively small scale. With the contour ...
13
votes
3answers
827 views
Best practices for visualising clustered features in web maps?
I'm looking for the best symbol to display clustered features in the ArcGIS Server JS API.
I don't like the "fly-out" animated cluster symbol, as used in the Silverlight API clustering or the JS ...
10
votes
3answers
538 views
How to simplify a routable network?
I have a network graph that I need to simplify in the sense of reducing the number of edges. The idea would be to merge nodes that are located close together and remove the connecting short edges.
...
10
votes
4answers
712 views
Large shapefile to raster
I have a large shapefile (1 gb) and need to rasterise it. I have tried the following already.
1.) Import it into GRASS using v.in.ogr this failed with the error message: ERROR: G_realloc: unable to ...
5
votes
1answer
633 views
Why do simplify polygon results differ between ArcGIS and PostGIS?
I am mainly interested in why and how the Simplify Polygons tool in ArcGIS handles the simplification process, including preventing and resolving topological errors better than the equivalent ...
2
votes
1answer
291 views
Redistribute linestring vertices to specified distance
I use a groundwater model program called GMS, and it has a very useful function "Redistribute vertices" (more info). I use this function all the time to both simplify and provide regular spacings ...
