Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Hi Jon, I just found some time to look at the source of netcdf-java 4.1. As far as I can see, only some projections (LambertConformalConicEllipse, AlbersEqualAreaEllipse, UTM) support ellipsoids, while the others use a constant spherical earth with EARTH_RADIUS = 6371.229km In particular, Stereographic projection doesn't support ellipsoids, so this explains the offset in my maps. Would be nice to have this assured by one of the unidata-developpers. I mainly checked the ucar/unidata/geoloc/projection sources. Best regards, Heiko On 2010-03-10 14:38, Jonathan Blower wrote: > Hi Heiko, > > This is a good question. ncWMS relies on netcdf-java for converting coords > to wgs84 lat lon, so I'm copying this to the mailing list in the hope that > someone can enlighten me about ellipsoid support in the library. > > Cheers, Jon > > -----Original Message----- > From: Heiko Klein <Heiko.Klein@xxxxxx> > Sent: 09 March 2010 08:54 > To: Jonathan Blower <j.d.blower@xxxxxxxxxxxxx> > Subject: ncWMS and ellipsoid-support in CF-1.2 > > Hi Jon, > > I currently try to visualize some satellite ice-maps over the north-pole > with ncWMS, but the data seems to be displaced by some 10-30km compared > with the land-maps (generated by mapserver). > > While geo-tools and therefore ncWMS support lots of coordinate reference > systems for the presented maps, the support for ellipsoids was only > added to CF-1.2. Do you know if ncWMS already supports the CF-1.2 > features like semi_major_axis/semi_minor_axis for input-files, or does > it assume the CF-1.0 spherical earth with 6371km radius? > > Best regards, > > Heiko >
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