On 04/05/2014 11:38 AM, Anita Graser wrote: > Am 05.04.2014, 20:30 Uhr, schrieb AntonioLocandro > <[email protected]>: > >> A source for the z factor values given would be good for reports as >> usually >> one has to document things like that, is there a link available or >> document >> of why those specific z values would work? > > Sorry, I don't have a literature source at hand. I got these z factor > valuse from Marco Hugentobler's comments to > http://anitagraser.com/2012/01/19/a-guide-to-beautiful-reliefs-in-qgis/ > > Best wishes, > Anita >
Look like an approximation of the conversion from Decimal Degrees to meters/feet http://en.wikipedia.org/wiki/Decimal_degrees If you need more accurate results convert your DEM to a local projection 1st and do it all in meters. Thanks, Alex _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
