Re: [gdal-dev] geographic vs projected coordinate system

2013-06-10 Thread Martin Feuchtwanger
Some of Phil's and Andre's words require correction: Just because it is so simple mathematically, the Plate Carree (or equi-rectangular) projection is no less of a projection than others. Like /all /projections, it has its distortions and yet it preserves some geometrics. It is in the class kn

Re: [gdal-dev] geographic vs projected coordinate system

2013-06-10 Thread Phil Scadden
You are correct in that imaging a round earth on a flat screen must involve projection. However, there is no one projection that is fit for all purposes so it is pretty normal to store data sets in GCS and project on-the-fly into whatever projection is fit for purpose. To complicate matters, de

Re: [gdal-dev] geographic vs projected coordinate system

2013-06-10 Thread Jean-Claude Repetto
Le 10/06/2013 17:44, Andre Joost a écrit : What you see on the screen, is in fact projected, but with a simple one degree = one unit on the screen projection. The extent of that map is still +/- 180°/90° This projection is the same as "Plate carrée" (EPSG:32663), except that the units are deg

Re: [gdal-dev] geographic vs projected coordinate system

2013-06-10 Thread Andre Joost
Am 10.06.2013 08:37, schrieb adi_khan: Hi all, I am a novice to geospatialrelated terminology...and going through some literature to understand better.. Could someone please tell difference btwn geographic and projected coordinate system... I mean, I am not able to imagine how I can see an (sate

[gdal-dev] geographic vs projected coordinate system

2013-06-09 Thread adi_khan
Hi all, I am a novice to geospatialrelated terminology...and going through some literature to understand better.. Could someone please tell difference btwn geographic and projected coordinate system... I mean, I am not able to imagine how I can see an (satellite) image on screen ( flat surface)