Re: Need #1, I just tried this and can quantify the main problem. The Mumbai Freemap WMS does not seem to be able to use the SRS tag to return requests in EPSG:4326, which the JOSM WMS plugin expects. It is currently returning requests in EPSG:32643.
Alternatively, the JOSM WMS plugin could be made to make requests in other coordinate systems... - Beau On Sat, Jul 5, 2008 at 10:26 PM, Mikel Maron <[EMAIL PROTECTED]> wrote: > Hi > > Let me see if I can summarize the current data sets available in Mumbai. > > * In February, Martijn imported AND data for India, including great detail > over Mumbai. However, when examining the data post-import with locals, we > discovered there was no consistent offset on the data .. there were a large > number of inconsistencies and errors. Consulting with AND, we learned that > Mumbai data was largely a side project of AND employees of untraced origin. > It's likely this data was created without much regard for geographic or > feature accuracty. > > * The Mumbai Freemap data was prepared for the web a couple years ago. That > data is available as a WMS, though there are currently some unknown issues > with incorporating that WMS server into JOSM. > > * There is now new data available fromthe Maharashtra Dept of Public Works, > including quite a few data layers. (Maharashtra is the India state in which > Mumbai is situated). That data is stored in some funky Shapefiles. > > > The question is where to go from here. Technically there are two main > needs. Can anyone volunteer a little time on... > > 1) Get the Freemap server serving WMS requests to JOSM correctly. > 2) Write conversion scripts for the Shapefiles into OSM. My thinking is > that a ruby script, using osmlib and ruby-shapefile is the most > straightforward way to go. > > > With these technical problems passed, we'll have three data sets to work > with and compare. JOSM can handle this, though it might through up some > usability issues with such large data sets. We may discover that parts of > AND Mumbai are so jumbled that it's better to clear the slate and start > fresh by importing MDPW data, or tracing Freemap. I don't think all of > Mumbai will have this problem -- the older parts of Mumbai are likely to be > more accurate. Locals will need to look at this area by area, and make > judgements, and the whole effort organizing as a WikiProject Mumbai on the > OSM wiki. > > Mikel > > > ** > ----- Original Message ---- > From: Shekhar Krishnan <[EMAIL PROTECTED]> > To: OSM Talk <[email protected]> > Sent: Saturday, July 5, 2008 2:32:02 PM > Subject: Re: [OSM-talk] who moved Mumbai? > > 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 > Mumbai. > > 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! > > Best, > > > Shekhar > > [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 <[EMAIL PROTECTED]>: > >> 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 >> >> _______________________________________________ >> talk mailing list >> [email protected] >> http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk >> > > > > -- > > Shekhar Krishnan > 9 Supriya, 2nd Floor > Plot 709, Parsee Colony Road no.4 > Dadar, Mumbai 400014 > India > > http://web.mit.edu/shekhar > http://heptanesia.net > http://bombayology.net > > _______________________________________________ > talk mailing list > [email protected] > http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk > >
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