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<DIV><FONT face=Arial size=2>Dear Juan,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Yes, you are right to correct me. The gvSIG
distance is ca 5% less than the Google Earth distance, so I'm attaching the the
original kml file and the shape file which includes two 'length' fields. The
first length field was created using Sextante, while the 'Length 2' field was
created by the length determination facility in gvSIG.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>You'll also notice that the kml file shows a very
small part of the infamous complex of berms that have been created by
Morocco in Western Sahara. I've already digitised, in Google Earth, the entirety
of the berms and I now want to calculate their lengths and input them into
gvSIG for further analysis. This is part of my PhD research on the war in
Western Sahara.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Best wishes,</FONT></DIV>
<DIV><FONT face=Arial size=2>Sal</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=jldominguez@prodevelop.es
href="mailto:jldominguez@prodevelop.es">Juan Lucas Dominguez Rubio</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=gvsig_internacional@listserv.gva.es
href="mailto:gvsig_internacional@listserv.gva.es">Users and Developers mailing
list</A> ; <A title=gvsig_internacional@listserv.gva.es
href="mailto:gvsig_internacional@listserv.gva.es">Users and Developers mailing
list</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, November 08, 2010 12:18
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Gvsig_english] determining
length of lines in a polyline layer</DIV>
<DIV><BR></DIV>
<DIV id=idOWAReplyText25026>
<DIV><FONT face="Times New Roman" color=#000000 size=3>Hello,
Sal.</FONT></DIV>
<DIV> </DIV>
<DIV>"95% less than" means "20 times less than", actually.</DIV>
<DIV> </DIV>
<DIV>Do you mean "5% less than"? (you expected 100 and got 95)</DIV>
<DIV> </DIV>
<DIV>I have made a test with the attached shapefile and:</DIV>
<DIV> </DIV>
<DIV>
<DIV>gvSIG says it's length is 50.12 m
<DIV>Google Earth says it's length is 50.06 m</DIV>
<DIV> </DIV>
<DIV>The difference is about 0.12 %.</DIV>
<DIV> </DIV>
<DIV>Can you send your example?</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>Regards,</DIV></DIV></DIV>
<DIV><FONT face="Times New Roman" color=#000000
size=3></FONT> </DIV></DIV>
<DIV id=idSignature15203>
<DIV><FONT face="Courier New" size=2><FONT face="Times New Roman" size=3>Juan
Lucas Domínguez Rubio<BR></FONT>---</FONT></DIV>
<DIV><FONT face="Courier New" size=2><FONT face="Courier New" size=2><FONT
face="Courier New" size=2>Prodevelop SL, Valencia (España)</FONT></DIV>
<DIV>
<DIV><FONT face="Courier New" size=2>Tlf.: 96.351.06.12 -- Fax:
96.351.09.68<BR></FONT><A href="http://www.prodevelop.es"><FONT
face="Courier New" size=2>http://www.prodevelop.es</FONT></A><BR><FONT
face="Courier New" size=2>---</FONT></DIV></FONT></DIV></FONT></DIV>
<DIV><BR>
<HR>
<FONT face=Tahoma size=2><B>De:</B> <A
href="mailto:gvsig_internacional-bounces@listserv.gva.es">gvsig_internacional-bounces@listserv.gva.es</A>
en nombre de Sal Garfi<BR><B>Enviado el:</B> lun 08/11/2010
12:31<BR><B>Para:</B> Users and Developers mailing list<BR><B>Asunto:</B>
[Gvsig_english] determining length of lines in a polyline
layer<BR></FONT><BR></DIV>
<DIV>
<DIV><FONT face=Arial size=2>Dear All,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have recently digitised linear features in
Google earth that I have converted from kml format to shape files. I wanted to
tabulate the total distances of these lines in gvSIG so I used the available
facility in vector line tools in Sextante. However, the distances were on
average 95% less than the distances noted in the features' properties in
Google Earth. I then used gvSig's own facility for determining lengths of
polylines and these were the same as those determined in Sextante. I'm working
in WGS84 - so what could be causing the differences? And which system is
correct, Google Earth or gvSIG? </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>All the best,</FONT></DIV>
<DIV><FONT face=Arial size=2>Sal Garfi</FONT></DIV></DIV>
<P>
<HR>
<P></P>_______________________________________________<BR>Gvsig_internacional
mailing
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