[Gvsig_english] BUG: gvSIG 1.9 (Build 1253) Image Filtering

[Jorge Gaspar Sanz Salinas]

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On 17/12/09 14:18, Simon Cropper (Botanicus Australia Pty Ltd) wrote:
> Ben,
> 
> "Projection = a mathematical formula and its parameters that allows you to literally
> project "natural" locations on the Earth's curved 3D surface to a plane for display on 
> e.g. a 2D map or monitor. An approximation model of Earth's geoid shape ("Ellipse") is
> also needed for this to work."
> 
> OK... after you project the "natural" locations on the earths curved 3D surface to a plane what is the visual 2D representation called? Don't say projection. Whats its name? Are their multiple versions of this entity (depending on the creator)? How does this relate to lat-long? 
> 
> Do you know of a good explanation of the "Datum + Projection + CRS = SRS" concept on the web (or can you provide one), so I can better understand the distinction between the various components?
> 
> Cheers Simon
> 

Simon,

This thread (as a geodesy engineer) is quite pleasant for me but maybe
you can point to this site:

http://www.crs-geo.eu

You've got there good explanations by the guys (you know, geodesic
smart people) of what a coordinate system and a datum are.

Best

- -- 
Jorge Gaspar Sanz Salinas
Ingeniero en Geodesia y Cartografía
http://www.prodevelop.es
tfno: +34 963 510 612

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