<br><br><div class="gmail_quote">On Tue, Jul 5, 2011 at 1:05 PM, Daniel Lee <span dir="ltr"><<a href="mailto:lee@isi-solutions.org">lee@isi-solutions.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<p>That really is a guessing game, because even if someone finds the coordinates that the map could fit into, it still doesn't mean that they're correct. Do you have a reason to think that the datum is WGS84? I think South Africa probably uses a more accurate regional datum for local maps - that makes a lot more sense unless you're working directly with web mapping applications or you want to use GPS data directly.</p>
</blockquote><div><br></div><div>Yes - everybody is using WGS84, because it comes from a GPS - and reprojection usually is to be avoided because it is difficult to understand (I am allowed this statement - I have lived in SA and really loved it there!).</div>
<div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<p>Isn't there any metadata provided with the shapefiles? I didn't know that it was possible to have a shapefile without any kind of spatial reference stored in the metadata. You could try making a location based on the shapefile as a georeferenced file.</p>
</blockquote><div><br></div><div>Well - as far as I know, the projection info comes in a .prj file (missing) and the .shp file efectively contains the points, dbf the attribute table and the shx the spatial index - no metadata.</div>
<div>All the data I have is the data - no metadata.</div><div>Here is the output from ogrinfo:</div><div><br></div><div><div><font class="Apple-style-span" face="'courier new', monospace">$ ogrinfo kcla_boundary.shp</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace">INFO: Open of `kcla_boundary.shp'</font></div><div><font class="Apple-style-span" face="'courier new', monospace"> using driver `ESRI Shapefile' successful.</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace">1: kcla_boundary (Line String)</font></div><div><font class="Apple-style-span" face="'courier new', monospace">rkrug@ecolmod:~/Documents/Projects/HakeaLandscape/trunc/GIS/locations/Keurboom/region$ ogrinfo -al kcla_boundary.shp</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace">INFO: Open of `kcla_boundary.shp'</font></div><div><font class="Apple-style-span" face="'courier new', monospace"> using driver `ESRI Shapefile' successful.</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace"><br></font></div><div><font class="Apple-style-span" face="'courier new', monospace">Layer name: kcla_boundary</font></div><div><font class="Apple-style-span" face="'courier new', monospace">Geometry: Line String</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace">Feature Count: 1</font></div><div><font class="Apple-style-span" face="'courier new', monospace">Extent: (17001.174423, -3754438.151804) - (37019.926542, -3743929.774592)</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace">Layer SRS WKT:</font></div><div><font class="Apple-style-span" face="'courier new', monospace">(unknown)</font></div><div><font class="Apple-style-span" face="'courier new', monospace">ID: Integer (8.0)</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace">OGRFeature(kcla_boundary):0</font></div><div><font class="Apple-style-span" face="'courier new', monospace"> ID (Integer) = 0</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace"> LINESTRING (36961.220524529955583 -3748802.374081357847899,34701.038833641323436 -3749477.493287727236748,30885.147667205979815 -3747804.371776290237904,26218.019240565823566 -3746336.721327661070973,21316.066742145034368 -3743929.774591909721494,19877.769302488635731 -3745749.661148209590465,18821.060979475769273 -3745544.19008540129289,17470.822566737107991 -3746160.603273825719953,17001.174423175834818 -3748362.078946769237518,21169.301697282135137 -3750152.612494096625596,24368.77967529331363 -3750181.965503069106489,26276.725258510985441 -3751855.087014506105334,28360.788895564135601 -3753234.678436217363924,30591.617577480181353 -3754438.151804093271494,32323.44510686238209 -3753674.973570805974305,27715.022698167384078 -3751708.321969643235207,27509.55163535932661 -3750739.672673548106104,30180.675451864066417 -3750035.200458206236362,34025.919627271992795 -3751737.6749786157161,37019.92654247511382 -3748861.080099302809685)</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace"><br></font></div></div><div><font class="Apple-style-span" face="arial, helvetica, sans-serif">Thanks,</font></div><div><font class="Apple-style-span" face="arial, helvetica, sans-serif"><br>
</font></div><div><font class="Apple-style-span" face="arial, helvetica, sans-serif">Rainer</font></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<p>Best,<br>
Daniel</p>
<p>--<br>
B.Sc. Daniel Lee<br>
Geschäftsführung für Forschung und Entwicklung<br>
ISIS - International Solar Information Solutions</p>
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<div class="gmail_quote">Am 05.07.2011 12:59 schrieb "Rainer M Krug" <<a href="mailto:r.m.krug@gmail.com" target="_blank">r.m.krug@gmail.com</a>>:<div><div></div><div class="h5"><br type="attribution">> Hi<br>
> <br>> I have two shape files of which I do not know the projection (and it seems<br>
> that the person I got them from does not know either...). The maps are from<br>> the Keurboom nature reserve area in South Africa (<br>> <a href="http://plak.co.za/moreinfo.php?id=347" target="_blank">http://plak.co.za/moreinfo.php?id=347</a>) and the two shp files have the<br>
> folowing bounding boxes:<br>> <br>> <br>> In layer spatial reference system units : xMin,yMin 21340.4,-3755528.75 :<br>> xMax,yMax 34244.9,-3749187.87<br>> <br>> In layer spatial reference system units : xMin,yMin 17001.2,-3754438.15 :<br>
> xMax,yMax 37019.9,-3743929.77<br>> <br>> <br>> I know this is a guessing game, but it must be a common projection - the map<br>> datum is very likely (almost certainly) WGS84.<br>> <br>> <br>> Any suggestions welcome,<br>
> <br>> <br>> Rainer<br>> <br>> <br>> -- <br>> Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology,<br>> UCT), Dipl. Phys. (Germany)<br>> <br>> Centre of Excellence for Invasion Biology<br>
> Stellenbosch University<br>> South Africa<br>> <br>> Tel : <a href="tel:%2B33%20-%20%280%299%2053%2010%2027%2044" value="+33953102744" target="_blank">+33 - (0)9 53 10 27 44</a><br>> Cell: <a href="tel:%2B33%20-%20%280%296%2085%2062%2059%2098" value="+33685625998" target="_blank">+33 - (0)6 85 62 59 98</a><br>
> Fax (F): <a href="tel:%2B33%20-%20%280%299%2058%2010%2027%2044" value="+33958102744" target="_blank">+33 - (0)9 58 10 27 44</a><br>> <br>> Fax (D): <a href="tel:%2B49%20-%20%280%293%2021%2021%2025%2022%2044" value="+4932121252244" target="_blank">+49 - (0)3 21 21 25 22 44</a><br>
> <br>> email: <a href="mailto:Rainer@krugs.de" target="_blank">Rainer@krugs.de</a><br>> <br>> Skype: RMkrug<br></div></div></div>
</blockquote></div><br><br clear="all"><br>-- <br>Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany)<br><br>Centre of Excellence for Invasion Biology<br>Stellenbosch University<br>
South Africa<br><br>Tel : +33 - (0)9 53 10 27 44<br>Cell: +33 - (0)6 85 62 59 98<br>Fax (F): +33 - (0)9 58 10 27 44<br><br>Fax (D): +49 - (0)3 21 21 25 22 44<br><br>email: <a href="mailto:Rainer@krugs.de" target="_blank">Rainer@krugs.de</a><br>
<br>Skype: RMkrug<br><br>