Hello listers, I recently subbed to this list and Sanjay's OP got me to weigh in here for the first time...
I'm one of the organizers of TeachOSM[1] and an administrator for TeachOSM's instance of the Tasking Manager[2]. Happy to have you use our TM to support this project. Please shoot me a note offline and I'll help you get started. By way of introduction, I'm a long time contributor to OpenStreetMap, organize events in WashDC with MappingDC, former US board OSM-US, and MaptimeDC organizer. Happy to help organize an OHM-based project for a DC Maptime event. This is an awesome project and I'd be happy to see if there's a way to get students/young adults interested in, and organized to contribute. Steven Johnson [1] http://teachosm.org [2] http://tasks.teachosm.org -- SEJ -- twitter: @geomantic -- skype: sejohnson8 There are two types of people in the world. Those that can extrapolate from incomplete data. On Fri, Sep 25, 2015 at 3:48 PM, Sanjay Seth <[email protected]> wrote: > Jerry – > > Thanks for the quick and detailed reply. Watched your video that > referenced NYPL’s Map Warper before posting here. And right after I sent > this message to OHM, I sent a message to MapTime organizers. Will see where > it goes! > > The NOAA maps are in Clarke 1661 projections and, while they have points > that could be used to rectify, I have been georeferencing the maps in > ArcGIS. Is there a benefit to doing the rectification in Map Warper vs > ArcGIS, as far as the OHM/OSM workflow? It may be easier to share the > georeferenced maps after the fact, than georeferencing natural features in > a browser. (NOAA maps > <http://nosimagery.noaa.gov/images/shoreline_surveys/survey_scans/NOAA_Shoreline_Survey_Scans.html> > ) > > I really like the OSM Task Manager that HOTOSM has running. It would be > nice to be able to feed this into that process and chunk out the tasks to > the various universities in the region that would be interested in taking > on a part of it. Not sure I have the technical chops to get it up and > running, but it sounds like a good way to break this up. > > Semi-automated tracing sounds interesting, though the maps are not uniform > in style. What are some good resources to look into further? I have stayed > away from ArcGIS’s automated tracing, as it is better for roads or very > obviously defined polygons. The wetlands are signified not by shading or > stroke, but by a kind of grassy icon, which may make automation less > tenable. > > David – I’ve checked that source, but I need a rather uniform data series > that covers a 31-county region as early as possible. Thanks for the tip, > though. > > Really appreciate the replies, as I start exploring how to open up this > process. Would love to have a regional historic wetland map available to > the planning community that extends earlier than 1900. > > Best, > Sanjay > > *—* > > *Sanjay Seth* | Research Analyst > > Regional Plan Association > > (917) 546-4327 | rpa.org > > From: SK53 <[email protected]> > Date: Fri, 25 Sep 2015 15:26:47 -0400 > To: Sanjay Seth <[email protected]> > Cc: "[email protected]" <[email protected]> > Subject: Re: [OHM] Mapping the NY Metro Region's Historic Wetlands > > Hi Sanjay, > > A timely query. We were discussing only on Tuesday about the use-cases for > mapping historical ecological data. This example of course reflects lots of > them (wetlands as buffers in extreme events; as components of water > quality; and in some parts of the world sources of disease). > > Again we discussed on Tuesday ideas for getting communities involved. I > have been thinking about this over the past few days and realise that the > scheme used by Humanitarian mappers, Missing Maps, and the smaller > get-togethers under the MapTIme banner both represent models for getting a > group of people to map specific things allowing straightforward training, > coaching & mentoring. Another, rather different, approach is the Irish > Townland mapping project, which involves rectifying 1:25k maps covering > Ireland (80,000+ sq km) and drawing 60,000 small administrative units from > them. > > Currently the OHM community is quite small and many of us have multiple > commitments to existing projects and related OSM activities (for instance I > am doing some specific things in the context of the townlands project), so > I don't think we are a great pool of tracers. The much larger OSM > communities do have many more people who are looking for such challenges. > I'd perhaps start by seeing if MapTime New York > <http://www.meetup.com/Maptime-NYC/> might be interested in giving you a > slot. > > Now for some of the technical problems/issues: > > - OHM requires that each tagged object natural=wetland is also marked > with a start_date & end_date. > - It is generally valuable to use a tag which identifies the apparent > as_of date of the wetland (i.e., based on underlying map), this makes > querying easier). This also makes it easier to filter data in some editors. > - It is easier to map something multiple times in different time > periods rather than try & reconcile an object across from many source maps. > (At least this is true until one has lots of such things). > - Coastlines may create problems. This is because of the OSM way of > handling coastlines is inelegant. I do have some ideas about how to > approach this, but haven't taken them forward yet: the coastline of the > River Plate changed dramatically in the late 19th C so affecting stuff I > have done with Buenos Aires). > - Use meta tags (source etc.) copiously; they will be the only > evidence of someone's interpretation of the sources. Ultimately other info > like photos, paintings and documentary evidence may need to be > incorporated. > > Use of any of the Map Warper websites (NYPL, MapWarper & WikiMedia) for > rectification would ensure that warped maps are readily available in the > editors, and following the Townlands model can also be crowd-sourced. > > It may also be worth looking at semi-automated tracing if the map quality > permits such an approach. > > HTH, > > Jerry Clough > > > > > On 25 September 2015 at 19:43, Sanjay Seth <[email protected]> wrote: > >> Dear OHM Community – >> >> I hope you are all doing well. I’m a researcher at an urban policy >> think-tank based in NYC. We are looking at long-term coastal adaptation >> strategies – and are working to map out the NY metropolitan region’s >> historic wetlands, which we will use (in addition to projected future >> wetlands) to inform those strategies. >> >> I’m new to the OHM community, but would like to gauge the interest in >> taking this on together as a group tracing effort. I have hundreds of >> historic maps from NOAA, starting from 1830’s onward, that would be >> relatively straightforward to trace, once they were georeferenced. We’re in >> the process of georefererencing the lot right now. I just don’t have the >> people-power to trace out thousands of wetlands on my own. >> >> If this sounds like a project you are interested in – or want to just >> hear more about – let me know. Thanks and feel free to get in touch at >> [email protected] or (917) 546-4327. >> >> Best wishes, >> Sanjay >> >> *—* >> >> *Sanjay Seth* | Research Analyst >> >> Regional Plan Association >> >> (917) 546-4327 | rpa.org >> >> _______________________________________________ >> Historic mailing list >> [email protected] >> https://lists.openstreetmap.org/listinfo/historic >> >> > > > ------------------------------ > > This email has been scanned for spam and viruses by Proofpoint Essentials > cloud email security - click here > <https://us1.proofpointessentials.com/index01.php?mod_id=11&mod_option=logitem&mid=680564452&rid=48209320&report=1> > to report this email as spam. > > > _______________________________________________ > Historic mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/historic > >
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