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This looks like a remarkable project. Have you seen if there are any
pre-rectified wetlands materials in the NYPL Map Warper
[<a class="moz-txt-link-freetext" href="http://maps.nypl.org/warper">http://maps.nypl.org/warper</a>]?<br>
<br>
<div class="moz-cite-prefix">On 9/25/15 15:26, SK53 wrote:<br>
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<div>Hi Sanjay,<br>
<br>
</div>
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).<br>
</div>
<br>
</div>
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.<br>
<br>
</div>
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 <a moz-do-not-send="true"
href="http://www.meetup.com/Maptime-NYC/">MapTime New York</a>
might be interested in giving you a slot.<br>
<br>
</div>
Now for some of the technical problems/issues:<br>
<ul>
<li>OHM requires that each tagged object natural=wetland is
also marked with a start_date & end_date.</li>
<li>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.<br>
</li>
<li>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).</li>
<li>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).</li>
<li>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.</li>
</ul>
<p>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.</p>
<p>It may also be worth looking at semi-automated tracing if the
map quality permits such an approach.</p>
<p>HTH,</p>
<p>Jerry Clough<br>
</p>
<p><br>
</p>
<p><br>
</p>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On 25 September 2015 at 19:43, Sanjay
Seth <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:sanjay@rpa.org" target="_blank">sanjay@rpa.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div
style="word-wrap:break-word;color:rgb(0,0,0);font-size:14px;font-family:Calibri,sans-serif">
<div>Dear OHM Community – </div>
<div><br>
</div>
<div>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. </div>
<div><br>
</div>
<div>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. </div>
<div><br>
</div>
<div>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 <a
moz-do-not-send="true" href="mailto:sanjay@rpa.org"
target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:sanjay@rpa.org">sanjay@rpa.org</a></a> or <a
moz-do-not-send="true" href="tel:%28917%29%20546-4327"
value="+19175464327" target="_blank">(917) 546-4327</a>. </div>
<div><br>
</div>
<div>Best wishes,</div>
<div>Sanjay</div>
<div><br>
</div>
<div>
<p style="font-size:11pt;margin:0in 0in 0.0001pt"><b><span
style="font-size:10.5pt;font-family:'Proxima
Nova';color:rgb(145,145,145)">—</span></b><span
style="font-size:10.5pt"></span></p>
<p style="font-size:11pt;margin:0in 0in 0.0001pt"><b><span
style="font-size:10.5pt;font-family:'Proxima
Nova';color:rgb(145,145,145)">Sanjay Seth</span></b><span
style="font-size:15pt;font-family:'Proxima
Nova';color:rgb(145,145,145)"> </span><span
style="font-size:10.5pt;font-family:'Proxima
Nova';color:rgb(145,145,145)">| Research Analyst </span></p>
<p style="font-size:medium;margin:0in 0in 0.0001pt"><span
style="color:rgb(145,145,145);font-family:'Proxima
Nova';font-size:13px">Regional Plan Association</span></p>
<p style="font-size:medium;margin:0in 0in 0.0001pt"><span
style="font-size:12px"><span
style="font-family:'Proxima
Nova';color:rgb(145,145,145)"><a
moz-do-not-send="true"
href="tel:%28917%29%20546-4327"
value="+19175464327" target="_blank">(917)
546-4327</a> | <a moz-do-not-send="true"
href="http://rpa.org" target="_blank">rpa.org</a></span></span></p>
</div>
</div>
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