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<DIV>Hello,</DIV>
<DIV> </DIV>
<DIV>I am fairly new to mapping towns in Africa, but would like to help out on
this project, especially since it is a water-related project and I am a
hydrologist. I have a few comments/questions:</DIV>
<DIV> </DIV>
<DIV>As a new mapper relatively unfamiliar with Africa, I cannot stress the
importance of any on-the-ground information that can be made available about how
to interpret imagery. Otherwise, how can I guess what I am looking at? For
example, in the Bassikounou imagery, what are these strange (sometimes very
large) white spots (sometimes in the shape of a bow-tie), for example at
15.8604986, –5.9610567? Some kind of tent?</DIV>
<DIV> </DIV>
<DIV>Buildings, walls and roads: I can understand the importance of a good base
map to the ICRC so they can use it for on-the-ground surveys of
water-development information.</DIV>
<DIV> </DIV>
<DIV>Intermittent ponds: Since this is very dry country, it seems to me that we
happen to have imagery taken after a fairly strong thunderstorm event (like the
<A
href="http://intersos.org/en/bulletin/news/malian-refugee-camps-under-water-floods">one
seen at the nearby refugee camp in 2012</A>), and the water we see is
essentially puddles left over from this storm., which will be very temporary in
duration. What we are mapping essentially are the low spots in the topography
where the water collects. I do not believe this has any relation to where
groundwater is located. If the ICRC is interested in topography, they might be
better off using SRTM elevation data – this also could be processed to find
possible dry river and stream channels.</DIV>
<DIV> </DIV>
<DIV>Trees: Are these Acacia trees? Since it is quite time consuming to map
these, is it proven that the tree density is indicative of water
availability?</DIV>
<DIV> </DIV>
<DIV>Wells: Although we are not mapping wells, I was very interested in the
email thread about wells (in Mali). I am very surprised that wells can be
located by looking at imagery. It seems that only a small fraction of wells
could be discernable, mostly only those that have paths converging at the well,
or by the animal tracks made by oxen pulling up the buckets. It is very
interesting to learn about these animal track patterns though – the length of
the animal tracks might be used as to estimate the (maximum) depth to
water).</DIV>
<DIV> </DIV>
<DIV>Dave</DIV>
<DIV> </DIV>
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<DIV> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=severin.menard@gmail.com
href="mailto:severin.menard@gmail.com">Severin Menard</A> </DIV>
<DIV><B>Sent:</B> Thursday, March 06, 2014 10:14 AM</DIV>
<DIV><B>To:</B> <A title=hot@openstreetmap.org
href="mailto:hot@openstreetmap.org">hot@openstreetmap.org</A> </DIV>
<DIV><B>Subject:</B> [HOT] Mapping Bassikounou, Mauritania - ICRC
request</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<DIV dir=ltr>Hi,
<DIV> </DIV>
<DIV>ICRC requested us to map an AOI (Area Of Interest) around Bassikounou, a
town close to the border with Mali, for a development project about drinkable
water. The approach is the same than for Walikale in DRC. To know more: <A
href="http://tasks.hotosm.org/job/447">http://tasks.hotosm.org/job/447</A></DIV>
<DIV> </DIV>
<DIV>As you can see, I added a banner to make clear what the job is from, for
and about. For sure HTML and wording could be improved, please make
suggestions.</DIV>
<DIV> </DIV>
<DIV>The map features are a bit more various than usual (eg intermittent ponds -
please find a link provided by the local Watsan specialist tp have an idea how
to identify them on Bing imagery - and trees).</DIV>
<DIV> </DIV>
<DIV>I also added a picture and a video of Bassikounou that I found in the web,
to have a better idea of what look like the streets and the outskirts.</DIV>
<DIV> </DIV>
<DIV>Sincerely,</DIV>
<DIV> </DIV>
<DIV>Severin</DIV></DIV>
<P>
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list<BR>HOT@openstreetmap.org<BR>https://lists.openstreetmap.org/listinfo/hot<BR></DIV></DIV></DIV>
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