[Talk-in] Mumbai Map Cleanup

[Arun Ganesh]

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> 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
>
> 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>> 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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