On Sat, Oct 31, 2009 at 02:26:33PM +0800, Lars O. Grobe wrote: > I have files, which are organized in a way like this > > altitudeAngle0AzimuthAngle0 MeasurementAngle0 > (...) > altitudeAngleNAzimuthAngleN MeasurementAngleN > > This can be (and is commonly) mapped in a equiangular projection, so > that azimuth still is the azimuth angle in the projection plane, and > altitude (which is measured from the normal) becomes radius. > > It is not that I would not be able to parse my files and calculate x,y > coordinates from the angles to do this reprojection. But all the > features in Gwyddion would believe to see kartesian data then. Support > for angular data would allow me to do measuring (but resulting not in mm > distances but in angles), show an appropriate legend and so on.
Everything in Gwyddion assumes data in a regular grid. Gwyddion is very single-minded. So if your data differ from that usually you have two options: - regularize -- project, interpolate, whatever is appropriate to get data in a regular grid - sacrifice the metrics, e.g. by using (φ,ϑ) instead of (x,y) as the grid coordinates In many cases, neither really helps you with what you need to do and then I'd say Gwyddion is not the right tool for the job. > I wonder whether something like that is already implemented, or how it > could be. It is not implemented; it could be, of course, but implementing it means introducing a completely new type of data and more or less implementing every function that you want to use with this type of data because 99% of them will have to do something a bit different (or very different) when the coordinates are curvilinear. Regards, Yeti ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Gwyddion-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/gwyddion-users
