ok, it seems there are 2 issues here: 1. The wrong results I get with vector/Geometry Tools/Export/Add Geometry Columns that are just missing digits to the right for large numbers
Giovanni: which version are you using? 2. The fact that results provided by R are so different. The most intriguing/worrying is that the R results are using package sp and package Rgeos. I'm dealing with Edzer Pebesma regarding this issue in R-sig-geo and will keep the list informed. Perhaps I will open a new ticket on this specific subject but lets wait to see what Edzer says. Agus El día 9 de abril de 2012 14:35, Giovanni Manghi <[email protected]> escribió: > >> Check, for example, polygons with ID 25967 and 26570: according to the table, >> the areas are >> 25967: 8550196769 >> 26570: 1736474738 >> >> while visual inspection indicates that 26570 is obviously much larger. > > > this depends on > > http://hub.qgis.org/issues/4955 > > if you compute areas (with both the filed calculator or the "add > geometry columns tool") you get > > ID Area_FC > 25967 8550196769.93 > 26570 173647473841.47 > > that makes sense according to the size of polygons > > > >> Both results are different than those calculated by R: >> >> 25967: 9294889613 >> 26570: 205414657947 >> >> Discrepancies with R are particularly large for polygons with area > 1E+10 > > > Can't understand these differences. > > > -- Giovanni -- > > _______________________________________________ > Qgis-developer mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-developer _______________________________________________ Qgis-developer mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-developer
