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Dear QGis Developpers and Users First of all many thanks to the Developpers of Qgis for this wonderful and user friendly Sofwaret. I'm sure that Qgis will become more and more a "standard" in the next few years So, just a small point (and I hope to be wrong with this, but if it is the case i don't see where) : as i needed to find quite exactly some ellipsoïdal distances, I'm afraid to have also found that in some cases the ellipsoïdal distance could have some problem in QGIS 1.7.4 (tested versions Windows and Debian). This could depend on the algorithm used and the geographical position of the points. The following table suggests for few studied points that the ellipsoïdal distances computed in Qgis 1.7.4 was overestimated and quite different than ellipsoïdal distances computed with the help of two geodesic estimations
Best regards _______________________________________________________________________________________ Didier Blavet Institut de Recherche pour le Développement - IRD (http://www.ird.fr) UMR Eco&Sols - Ecologie Fonctionnelle & Biogéochimie des Sols & Agroécosystèmes (Montpellier SupAgro-CIRAD-INRA-IRD) (http://www.montpellier.inra.fr/ecosols) Bâtiment 12, 2 place Viala, F-34060 Montpellier Cedex 2 , France Tel bureau : +33 (0)4 99 61 21 33 Secrétariat : +33 (0)4 99 61 21 01 / Fax : +33 (0)4 99 61 21 19 Courriel : [email protected] _______________________________________________________________________________________ |
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