*edited file links below
I'm working on several NGO projects at the moment, all of which are reliant on being able to use a district level map with some 490+ features, and I am running into some trouble with my geometries.
I spent most of the weekend trying to figure out how to snap the features together in this file (https://dl.dropbox.com/u/49434182/492%20Kabupaten%20Google%20Mercator.zip), to get rid of overlaps and slivers. Running the fTools validation tool, it tells me that I have more than 200 problems with this file. So, being a sensible person, I wanted GRASS to do the work for me. However, no matter how I tweaked the parameters of v.in.ogr, I couldn't eliminate the gaps or slivers when I went to export it again. GRASS would generate one layer of (basically) the geometries I wanted, and two layers of slivers.
I was able to get my hands on an official shapefile from the national statistics agency (found here: https://dl.dropbox.com/u/49434182/indokabkot_497_2010.zip), which although way more detailed, also has invalid/overlapping geometry according to fTools. I'm unsure of the right projection with this file, so that's also a bit of an issue.
I'm using QGIS 1.8, and am at a bit of a loss as to where I've gone wrong. Can anyone provide pointers before my data is due for a presentation next week?