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<DIV>Cleo,</DIV>
<DIV> </DIV>
<DIV>FAQ #7 under Altimetry products in the link you provide seems to answer the
question you ask. The FTP link in that paragraph leads you to a
program top2wgs.pro that solves your problem. The program assumes dX = dY
= dZ = 0. I’ve made the same assumption myself with <FONT
face="Times New Roman"><FONT face=Calibri>TOPEX/Poseidon in a different
context. Then follow Jose’s cs2cs instructions.</FONT></FONT></DIV>
<DIV> </DIV>
<DIV>Thanks for the link.</DIV>
<DIV> </DIV>
<DIV>Noel</DIV>
<DIV> </DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">Noel Zinn,
Principal, Hydrometronics LLC<BR>+1-832-539-1472 (office), +1-281-221-0051
(cell)<BR>noel.zinn@hydrometronics.com (email)<BR>http://www.hydrometronics.com
(website)<BR></DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=cleo21drakos@gmail.com
href="mailto:cleo21drakos@gmail.com">Cleo Drakos</A> </DIV>
<DIV><B>Sent:</B> Tuesday, August 19, 2014 3:39 AM</DIV>
<DIV><B>To:</B> <A title=proj@lists.maptools.org
href="mailto:proj@lists.maptools.org">PROJ.4 and general Projections
Discussions</A> </DIV>
<DIV><B>Subject:</B> Re: [Proj] Can I convert the ellipsoids using
Proj?</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<DIV dir=ltr>Dear Jose<BR><BR>Thanks for your answer. Can you help me how can I
make certain that both ellepsoids have the same geocentric coordinates.<BR>Only
the information I am having is below under the section of How does the GLAS
ellipsoid compare with WGS 84?<BR><BR>
<DIV><A
href="http://nsidc.org/data/icesat/faq.html#3_all">http://nsidc.org/data/icesat/faq.html#3_all</A>
<DIV>
<DIV> </DIV>
<DIV class=gmail_extra>
<DIV> </DIV>
<DIV>
<DIV dir=ltr>cleo</DIV></DIV><BR><BR>
<DIV class=gmail_quote>On Tue, Aug 19, 2014 at 6:03 AM, Jose Gonçalves <SPAN
dir=ltr><<A href="mailto:jagoncal@gmail.com"
target=_blank>jagoncal@gmail.com</A>></SPAN> wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<DIV dir=ltr>
<DIV>Cleo<BR><BR>If cartesian geocentric coordinates are the same and you just
want to express them in a different ellipsoid you can do:<BR><BR>cs2cs -f %.9f
+a=6378136.30 +rf=298.257 +proj=latlong +towgs84=0,0,0 +to +a=6378137
+rf=298.25722356 +proj=latlong +towgs84=0,0,0<BR><BR></DIV>
<DIV>If there are shift and rotation you can express them in the
+towgs84.<BR></DIV>
<DIV><BR>Regards<BR><BR></DIV>
<DIV>José <BR></DIV>
<DIV> </DIV></DIV>
<DIV class=gmail_extra><BR><BR>
<DIV class=gmail_quote>2014-08-18 15:13 GMT+01:00 Cleo Drakos <SPAN
dir=ltr><<A href="mailto:cleo21drakos@gmail.com"
target=_blank>cleo21drakos@gmail.com</A>></SPAN>:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
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<DIV style="FONT-SIZE: 13px; FONT-FAMILY: arial,sans-serif">Dear guys,</DIV>
<DIV style="FONT-SIZE: 13px; FONT-FAMILY: arial,sans-serif"> </DIV>
<DIV style="FONT-SIZE: 13px; FONT-FAMILY: arial,sans-serif">I have the data
(latitudes, longitudes, and elevations) given in ICESat/GLAS ellipsoid. This
equatorial radius and reciprocal flattening (1/f) on this ellipsoid
are 6378136.30 m and is 298.257 respectively.</DIV>
<DIV style="FONT-SIZE: 13px; FONT-FAMILY: arial,sans-serif"> </DIV>
<DIV style="FONT-SIZE: 13px; FONT-FAMILY: arial,sans-serif">Now, I want to
convert my data into WGS84 ellepsoid with equatorial radius and reciprocal
flattening (1/f) of 6378137.000000 and 298.25722356 respectively.</DIV>
<DIV style="FONT-SIZE: 13px; FONT-FAMILY: arial,sans-serif"> </DIV>
<DIV style="FONT-SIZE: 13px; FONT-FAMILY: arial,sans-serif">Can I convert
the ellipsoids using Proj?</DIV>
<DIV
style="FONT-SIZE: 13px; FONT-FAMILY: arial,sans-serif"> </DIV><SPAN
style="FONT-SIZE: 13px; FONT-FAMILY: arial,sans-serif">I hope some of you
can help me.</SPAN><SPAN><FONT color=#888888><BR>
<DIV class=gmail_extra>
<DIV> </DIV>
<DIV>
<DIV dir=ltr>cleo</DIV></DIV></DIV></FONT></SPAN></DIV>
<DIV> </DIV></DIV></DIV>
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