[Talk-in] Mumbai Map Cleanup

[Shekhar Krishnan]

Is anyone based in Mumbai interested in meeting up some evening over the 
next few weeks to discuss strategies for developing OpenStreetMap in 
Mumbai? Please contact me and we can fix a date and venue.

Best,


Shekhar

On 04/11/2010 08:11 PM, Arun Ganesh wrote:
> I just checked out the area, and it is littered with untagged nodes
> (43,000? <http://www.openstreetmap.org/browse/changeset/4362880>), like
> you said, the building geomentry is broken and there are no segments
> connecting the nodes :(
>
> Regarding using the mumbai freemap as a base, i have still not been able
> to access the map till date http://mumbai.freemap.in/ i can only see a
> bunch of points, and even that breaks when zoomed in. Does the dataset
> contain streetnames?
>
> On Sun, Apr 11, 2010 at 7:26 PM, Shekhar Krishnan <shekhar at mit.edu
> <mailto:shekhar at mit.edu>> wrote:
>
>     Yesterday I uploaded a set of buildings for the Colaba-Cuffe Parade
>     area of South Mumbai based on the datasets which our group CRIT
>     created through our Mumbai Freemap project several years ago. Our
>     shape files were converted to OSM using polyshp2osm.py and tagged
>     and uploaded via JOSM. One can now see a sprinkling of new buildings
>     here:
>     http://www.openstreetmap.org/?lat=18.91115&lon=72.81534&zoom=15
>     <http://www.openstreetmap.org/?lat=18.91115&lon=72.81534&zoom=15>
>
>     Editing these files in JOSM is *very* slow and difficult, as is
>     uploading via JOSM or using the batchupload py scripts. For each
>     shape file we have for all of Greater Mumbai, the shp2osm conversion
>     yields 40-50 osm files which must be uploaded individually. After
>     trying just one file, less than half of the total buildings are
>     being rendered by Mapnik, perhaps because their geometries are broken.
>
>     But the process works, and with more time and effort could result in
>     a major contribution to OSM which I've wanted to do for years now.
>     The AND data for Mumbai is both generally skewed and is very
>     inaccurate in some places (and fixed in others, thanks to
>     volunteers). And it is mostly just major roads. I agree with Arun
>     and Kenneth that it is perhaps easier to start afresh. Another
>     option is to use our datasets as a base from which to start, via
>     shp2osm conversion of our layers.
>
>     Our freemap dataset contain layers for buildings, roads, and other
>     public and reserved plots, with further work on conversion/import
>     and mapping attributes to tags we could make a significant
>     contribution to an entirely new OSM Mumbai either through direct
>     upload or conflation with the existing coverage from AND and volunteers.
>
>     Best,
>
>
>     Shekhar
>
>     PlaneMad wrote:
>
>         On Thu, Mar 18, 2010 at 12:27 PM, PlaneMad
>         <thePlaneMad at gmail.com <mailto:thePlaneMad at gmail.com>
>         <mailto:thePlaneMad at gmail.com <mailto:thePlaneMad at gmail.com>>>
>         wrote:
>
>              From my experience fixing Mumbai, i have come to realize
>         that its
>             pretty much impossible to realign the streets in parts without
>             confusing yourself. I had started deleting unnamed AND ways
>         to make
>             the task easier, but that didnt help too much as you lose the
>             reference street geometry to match with the yahoo imagery.
>
>             I feel the best way to fix the map is to remove all the AND
>         paths
>             completely, start tracing the roads and name them by using
>         an old
>             extract of the original AND import as reference. Good idea?
>             -- http://j.mp/ArunGanesh
>
>
>         Btw, i will be in Mumbai to attend India HCI at IIT powai from
>         20-24. If anybody else is attending, we could try to work
>         something out with the IIT students.
>
>         --
>         http://j.mp/ArunGanesh
>
>
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>
> --
> http://j.mp/ArunGanesh
>
>
>
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-- 

Shekhar Krishnan
CRIT (Collective Research Initiatives Trust)
B43, Shravasti
Goregaon-Malad Link Road
Malad (West), Mumbai 400064, India

http://crit.org.in
http://heptanesia.net