[OSM-talk] who moved Mumbai?

Shekhar Krishnan shekhar at crit.org.in
Sat Jul 5 22:32:02 BST 2008

Since someone mentioned the Mumbai Freemap [1] into OSM, I thought I would
finally introduce myself to the list. I am coordinator of the project, which
was developed in 2005-2006 to showcase the kind of geo-data being collected
by volunteers in Mumbai's architect and activist communities connected to
CRIT (Collective Research Initiatives Trust) [2].

The data itself is poorly formed, having been originally drawn in AutoCAD
without geographic attributes and retrospectively warped into shape files
from sets of disconnected lines and attribute tables [3]. In our community
mapping project, we now hope to merge our base layers into OSM and train
groups in JOSM to detail particular areas, which we can use as the basis for
projects on public spaces, community housing and heritage conservation in

For some time now we have wanted to contribute this data to OSM, and we now
have devoted funds from UNDP [4] which we plan to use in support of OSM as
an infrastructure for our research and design practice. Earlier this year
Mikel Maron and Schuyler Erle organised a series of Freemap/OSM  workshops
[5] which seeded new communities in cities across India, and in Mumbai
generated significant interest.

We think that the existing Mumbai Freemap is mostly useful as a backdrop
(WMS) against which new nodes and relations need to be traced and tagged
within OSM, and we are determined to migrate our vector data into OSM in
stages over the next few months. Chris Schmidt wrote this script [6] to
migrate MassGIS shape files into OSM.

Any suggestions on how best to approach this SHP to OSM migration and the
wider goals of our project are most welcome!



[1] http://mumbai.freemap.in
[2] http://crit.org.in
[3] http://wiki.freemap.in/moin.cgi/MumbaiFreeMapDatabase
[4] http://www.apdip.net/projects/ictrnd/2005/l43-in/
[5] http://wiki.freemap.in/moin.cgi/FreeMapIndia2008
[6] http://boston.freemap.in/osm/files/mgis_to_osm.py

2008/7/5 Nathan Vander Wilt <nate-lists at calftrail.com>:

> On Jul 5, 2008, at 1:01 AM, Kenneth Gonsalves wrote:
> > On 05-Jul-08, at 3:24 AM, Frederik Ramm wrote
> >>
> >>> everything is AND and everything is consistently out of place to
> >>> the  southeast with the same offset - is there any way to
> >>> programmatically  change this?
> >>
> >> I have a script that I could use for this task if people want.
> >> Obviously I'd need to know exactly what to move and by what amount...
> >
> > cool - will measure the offset and revert
> Are you sure this isn't a coordinate system datum issue? If the AND
> data uses a different datum than WGS-84, it may be more than just a
> simple offset for all vertices that you need. There are several open
> source programs available for converting from one datum to another.
> What datum is the original AND data in?
> thanks,
> -natevw
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Shekhar Krishnan
9 Supriya, 2nd Floor
Plot 709, Parsee Colony Road no.4
Dadar, Mumbai 400014

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