On Sat, Dec 5, 2009 at 7:51 PM, PlaneMad <[email protected]> wrote:
> On Sat, Dec 5, 2009 at 5:59 PM, Harshad RJ <[email protected]> wrote: > >> awesome. the census data was released under the mit license if i recall >> correctly and seems to be compatible with cc-by-sa >> http://creativecommons.org/licenses/MIT/ so it doesnt look like an issue. > > Great! > > the only issue is that the district data is outdated (2001) and many new > districts have been carved out and merged. two things can be done: > 1) wait for another free updated gis dataset from the govt (most probably > only 2011) > 2) put in the existing data as a starting point, which is in any case quite > useful and good for most parts. > > 2011 is really far away. Moreover, when the new data is available and bulk delete and upload could be done. I will try to preserve the node-ids of my upload, so that we could delete them with a script if required. >> - Are there any district boundaries that are already well mapped and >> need to be excluded? >> >> only the chennai city boundary which should be a lot more detailed than > the census one. all other existing boundaries were from the 2001 census > data > Umm is chennai city different from chennai district? > >> - Any other thoughts? >> >> do preserve all metadata for the shapes, like district code or number. > Ok. I had removed extraneous meta-data because it might pollute the OSM database (and namespace). Is there any standard way of keeping such non-standard meta data? :-D > one more thing that needs to be done is the merging of districts to create > the state boundaries. This > map<http://bitterscotch.files.wordpress.com/2008/06/india_map_outline.png>should > be a good reference for doing that . > I actually have a shapefile for all first-level administrative regions (aka states in India). The trouble is that it is apparently a line-shape file and not polygonal. The conversion tool has trouble dealing with that. In any case merging state and district boundaries is going to require some manual intervention. I guess you are hinting that with your raster map :) BTW, I have modified the original conversion script in OSM's SVN to merge nodes from adjacent regions. Otherwise, it was creating ways with separate nodes for each district! > Another issue is for Kashmir districts, i believe the whole PoK part is one > district, this might need some different tag maybe boundary=disputed > Well, since it's a one-off case, we could do it manually later. right ho, -- Harshad RJ http://hrj.wikidot.com
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