[Gvsig_english] determining length of lines in a polyline layer

[Juan Lucas Dominguez Rubio]

Hello, Sal.
 
"95% less than" means "20 times less than", actually.
 
Do you mean "5% less than"? (you expected 100 and got 95)
 
I have made a test with the attached shapefile and:
 
gvSIG says it's length is 50.12 m 
Google Earth says it's length is 50.06 m
 
The difference is about 0.12 %.
 
Can you send your example?
 
 
Regards,
 
Juan Lucas Domínguez Rubio
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________________________________

De: gvsig_internacional-bounces at listserv.gva.es en nombre de Sal Garfi
Enviado el: lun 08/11/2010 12:31
Para: Users and Developers mailing list
Asunto: [Gvsig_english] determining length of lines in a polyline layer


Dear All,
 
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? 
 
All the best,
Sal Garfi
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