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Hi Julia, Sorry it has taken so long to get back to you... re: > re: The source module for the nv1sae entry point is created from the NVXSAE > entry point in each navigation file in McIDAS. > > Yes, I found the same list of files. > > re: nvx*.dlm > > Is routine the same as a McIDAS-X command? How do I use it? No. The routine is a subroutine entry point used by various McIDAS commands. re: Exactly what are you trying to accomplish? > I want to know the satellite zenith viewing angle and the satellite > azimuth angle of GOES 12. Since it is a geostationary satellite, the two > angles should be constants. I thought maybe there is a command or API to > get the angles. And I found APIs from programmer's manual > http://www.ssec.wisc.edu/mcidas/doc/prog_man/2003/access-6.html. But on my > computer, I didn't find such function(nvxsae). That's why I sent my > question in the previous email. > > Do you know how to get these two angles? I found a simple program in SSEC's 2007 McIDAS XRD (X Research and Development) package that might do what you want for a point at a time. I am incorporating this routine, SATANGLES, (renamed from ANGLES because of a name clash with a library routine with the same name) in a new Unidata McIDAS-X addendum, v2006i. The procedure you need to follow to install the new addendum and build SATANGLES is: <as 'mcidas'> cd ~mcidas/mcidas2006/update ftp ftp.unidata.ucar.edu <user> umcidas <pass> uni_mci! cd unix/2006/bugfix binary get mcupdate.tar.gz get mcupdate.list.2006i get mcupdate quit chmod +x ./mcupdate ./mcupdate cd ../src make make xrd make install.xrd To use SATANGLES, you need to: - load an image using IMGDISP - move the cursor to the point you want to calculate satellite angles for - run SATANGLES without moving the cursor from the point you want - get the satellite angles from the textual output You may want to investigate using the SATANGLES source code (~mcidas/mcidas2006/src/satangles.pgm) as the basis for a routine that does exactly what you want/need. > Thank you very much. No worries. Cheers, Tom **************************************************************************** Unidata User Support UCAR Unidata Program (303) 497-8642 P.O. Box 3000 address@hidden Boulder, CO 80307 ---------------------------------------------------------------------------- Unidata HomePage http://www.unidata.ucar.edu **************************************************************************** Ticket Details =================== Ticket ID: RYQ-556281 Department: Support McIDAS Priority: Normal Status: Closed