<div dir="ltr">Dear all,<div><br></div><div>I found a pdf document: <a href="http://www.yale.edu/ceo/Documentation/MODIS_data.pdf">http://www.yale.edu/ceo/Documentation/MODIS_data.pdf</a></div><div><br></div><div>which state: "The data are provided in the HDF-EOS format. MODIS data at version 4 and above use </div><div>the Sinusoidal projection with the WGS84 datum. A very small sample of common </div><div>products are listed below."</div><div><br></div><div>Hope it helps</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">2014-10-24 9:30 GMT+02:00 Artur Bercik <span dir="ltr"><<a href="mailto:vbubbly21@gmail.com" target="_blank">vbubbly21@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote"><span class="">On Fri, Oct 24, 2014 at 3:50 PM, Mikael Rittri <span dir="ltr"><<a href="mailto:Mikael.Rittri@carmenta.com" target="_blank">Mikael.Rittri@carmenta.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<u></u><u></u><u></u>
<div lang="SV" link="blue" vlink="purple">
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<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10pt;font-family:Arial;color:navy">Hi Artur.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy">It could be the same thing. “Geodetic” latitude is the same as ordinary,
<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy">everyday latitude. There are some other flavours of latitude as well,
<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy">auxiliary latitudes that are mainly used to simplify some kinds of
<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy">computations, but “geodetic” is the ordinary kind.
<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy">For longitudes, there is only one flavour, but the zero meridian is
<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy">not always
<u></u><u></u>Greenwich<u></u><u></u>. <u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy">So the coordinates you mention could be in WGS84 Lat/Long already.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy">But it is not certain, since they could be expressed in some other
<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy">geodetic datum that uses a different ellipsoid.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy">Do you have any documentation about the geodetic datum of your<br>
coordinates (like Pulkovo 1942, Pulkovo 1995, PZ 1990, or WGS84), <u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy">or about the ellipsoid used?</span></font></p></div></div></blockquote><div><br></div></span><div>Dear Mikael Rittri <br><br>Thanks for your answer.<br>Actually, I could not understand which datum or ellepsoid was used. The following documents says only geodetic latitude and longitude:<br><br><a href="http://modaps.nascom.nasa.gov/services/about/products/MOD03.html" target="_blank">http://modaps.nascom.nasa.gov/services/about/products/MOD03.html</a><br><br>I have read the above data product; and retrieved the pairs of geodetic lats and lons as the document says, but could not figure out if I should convert them into WGS84 or not. I have to compare the data using above product with other data which are in WGS84 lats and lons. <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><span class=""><div lang="SV" link="blue" vlink="purple"><div><p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy">
<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy">Best regards,<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span lang="EN-US" style="font-size:10pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10pt;font-family:Arial;color:navy">Mikael Rittri<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10pt;font-family:Arial;color:navy">Carmenta<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10pt;font-family:Arial;color:navy">Sweden<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10pt;font-family:Arial;color:navy"><a href="http://www.carmenta.com" target="_blank">http://www.carmenta.com</a><u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
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<div class="MsoNormal" align="center" style="text-align:center"><font size="3" face="Times New Roman"><span lang="EN-US" style="font-size:12pt">
<hr size="2" width="100%" align="center">
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<p class="MsoNormal"><b><font face="Tahoma"><span lang="EN-US" style="font-size:10pt;font-family:Tahoma;font-weight:bold">From:</span></font></b><font face="Tahoma"><span lang="EN-US" style="font-size:10pt;font-family:Tahoma"> <a href="mailto:proj-bounces@lists.maptools.org" target="_blank">proj-bounces@lists.maptools.org</a>
[mailto:<a href="mailto:proj-bounces@lists.maptools.org" target="_blank">proj-bounces@lists.maptools.org</a>] <b><span style="font-weight:bold">On Behalf Of
</span></b>Artur Bercik<br>
<b><span style="font-weight:bold">Sent:</span></b> Friday, October 24, 2014 8:27 AM<br>
<b><span style="font-weight:bold">To:</span></b> <u></u><a href="mailto:proj@lists.maptools.org" target="_blank">proj@lists.maptools.org</a><u></u><br>
<b><span style="font-weight:bold">Subject:</span></b> [Proj] (no subject)</span></font><span lang="EN-US"><u></u><u></u></span></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt"><u></u> <u></u></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt">Dear Proj list members:<br>
<br>
Being a very new in this field, could someone answer me about the following problem:<br>
<br>
I have a pair of Geodetic Latitude and Geodetic Longitude (50.89524, 117.69043).<br>
How can I convert it into Latitude and Longitude with WGS84 Ellepsoid?<br>
<br>
Thanks in the advance.<br>
<br>
Artur<u></u><u></u></span></font></p>
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