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</head><body bgcolor="#FFFFFF" text="#000000">There is another side to
this the population counts often depend on building counts but some
towns and villages are growing rapidly. You can see the difference
sometimes going from one zoom level tile to the next so the ones with
buildings in often haven't the newer buildings mapped but just the old
ones are so the population estimates are based on the old images not the
later ones.<br>
<br>
Cheerio John<br>
<br>
<span>Pierre Béland via talk wrote on 2019-07-06 8:45 PM:</span><br>
<blockquote type="cite"
cite="mid:664144747.5494897.1562460329803@mail.yahoo.com">
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<div class="ydp5a9b910yahoo-style-wrap" style="font-family: verdana,
helvetica, sans-serif; font-size: 13px;"><div><div dir="ltr"
data-setdir="false">Speaking more generally, <br></div><div dir="ltr"
data-setdir="false">Populatation is growing fast in Africa and many
african countries dont have the resources to organize regular census.
See the UN Statistics Division record of last census by country <a
href="https://unstats.un.org/unsd/demographic/sources/census/censusdates.htm"
rel="nofollow" target="_blank" class="" moz-do-not-send="true">https://unstats.un.org/unsd/demographic/sources/census/censusdates.htm</a></div><div><br></div><div
dir="ltr" data-setdir="false">This means that quality vary from one
country to the other and that often we lack good info about distribution
of population in the various countries. The OSM building mapping
projects are often used for population estimates.<br></div><div
class="ydp5a9b910signature"><span style="font-style:italic;color:rgb(0,
0, 191);font-weight:bold;"> <br><font face="garamond, new york, times,
serif">Pierre </font><br></span></div></div>
<div><br></div><div><br></div>
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<div id="ydp69a07a98yahoo_quoted_2541982825"
class="ydp69a07a98yahoo_quoted">
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sans-serif;font-size:13px;color:#26282a;">
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Le samedi 6 juillet 2019 20 h 08 min 09 s UTC−4,
Darafei "Komяpa" Praliaskouski <a class="moz-txt-link-rfc2396E" href="mailto:me@komzpa.net"><me@komzpa.net></a> a écrit :
</div>
<div><br></div>
<div><br></div>
<div><div id="ydp69a07a98yiv8538673300"><div><div
dir="ltr"><div>Hi,</div><br clear="none"><div
class="ydp69a07a98yiv8538673300gmail_quote"><div
class="ydp69a07a98yiv8538673300yqt1728850209"
id="ydp69a07a98yiv8538673300yqtfd09385"><div
class="ydp69a07a98yiv8538673300gmail_attr" dir="ltr">On Fri, Jul 5, 2019
at 4:09 PM Jean-Marc Liotier <<a shape="rect"
href="mailto:jm@liotier.org" rel="nofollow" target="_blank"
moz-do-not-send="true">jm@liotier.org</a>> wrote:<br clear="none"></div></div><blockquote
class="ydp69a07a98yiv8538673300gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;"><div
class="ydp69a07a98yiv8538673300yqt1728850209"
id="ydp69a07a98yiv8538673300yqtfd19975">On Fri, July 5, 2019 2:40 pm,
Christoph Hormann wrote:<br clear="none">
><br clear="none">
> One warning: All global population data sets that exist are rough<br
clear="none">
> estimates with usually significant systematic biases and errors.
For<br clear="none">
> example in Switzerland the data set you used sees high population<br
clear="none">
> density in mountain areas with no basis in reality.<br clear="none">
<br clear="none">
Same in rural Senegal. Low-resolution population data I guess.</div><br
clear="none"></blockquote><div><br clear="none">Can you point to a
specific place please?<br clear="none"><br clear="none">What would be
the population dataset that you would recommend for Senegal?</div></div></div></div></div><div
class="ydp69a07a98yqt1728850209" id="ydp69a07a98yqtfd48873">_______________________________________________<br
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