This looks like a remarkable project. Have you seen if there are any pre-rectified wetlands materials in the NYPL Map Warper [http://maps.nypl.org/warper]?
On 9/25/15 15:26, SK53 wrote: > 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] > <mailto:[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] <mailto:[email protected]> or (917) 546-4327 > <tel:%28917%29%20546-4327>. > > Best wishes, > Sanjay > > *—* > > *Sanjay Seth* | Research Analyst > > Regional Plan Association > > (917) 546-4327 <tel:%28917%29%20546-4327> | rpa.org <http://rpa.org> > > > _______________________________________________ > Historic mailing list > [email protected] <mailto:[email protected]> > https://lists.openstreetmap.org/listinfo/historic > > > > > _______________________________________________ > Historic mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/historic
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