vrenjak@rm1.UUCP (Milan Vrenjak) (01/08/91)
I'm looking for an algorithm that would allow me to project a point from a world database (using longitude and latitude) to x,y coordinates using a satellite type projection. Also the reverse projection (mapping x,y to longitude and latitude) is required. What I want to do is draw a satellite view of the globe and allow it to rotate, in any direction- east-west, north-south, and so on. Any source, references, pointers, etc, will be greatly appreciated. Thanks in advance -- Milan vrenjak@rm1.UUCP
rthomson@mesa.dsd.es.com (Rich Thomson) (01/09/91)
In article <960@rm1.UUCP> vrenjak@rm1.UUCP (Milan Vrenjak) writes: >I'm looking for an algorithm that would allow me to project >a point from a world database (using longitude and latitude) >to x,y coordinates using a satellite type projection. >Also the reverse projection (mapping x,y to longitude and latitude) >is required. The standard reference for map projections is: _Map Projections -- A Working Manual_, USGS Technical Paper 1395, by John P. Snyder It contains formulas for projections of ellipsoidal and spherical approximations to the Earth's surface onto the plane (and the reverse). It also includes a special section on projections developed for satellite mapping. It has standard tables and projection formulas for all standard projections used by the USGS. The book (it is a paperback about an inch thick, even though it's title of "technical paper" suggests it to be small) is available through the USGS; mine was $20. You can find the USGS in the blue pages of your phone book under the Department of the Interior. -- Rich -- ``Read my MIPS -- no new VAXes!!'' -- George Bush after sniffing freon Disclaimer: I speak for myself, except as noted. UUCP: ...!uunet!dsd.es.com!rthomson Rich Thomson ARPA: rthomson@dsd.es.com PEXt Programmer