What is on-the-fly transformation

Topics: General Topics
Aug 16, 2006 at 12:06 PM
Have no clue wat the word means...Can someone please enlighten me

Thanx so much
Aug 16, 2006 at 7:47 PM
It means that you can apply another coordinate system to a shapefile other that the one that the shapefile has been created in.

There are 2 type of coordinates system, projected, and not projected. So you can "transform" the way the shapefile will be rendered if you apply a projected coord system.

It's also usefull if you want to work in lat/long, even if the shapefile is in a coordinate system that use the meters as the unit, for example.

All that kind of stuff.
Developer
Aug 16, 2006 at 10:13 PM
Actually there is no such thing as non-projected when you try to map the earth on a flat piece of paper.

But the point is that SharpMap can automatically reproject between several types of projections. Each projection has their pros and cons. Some preserve angles, others preserve area, some try do apply least distortion etc...
Aug 17, 2006 at 1:54 PM
Thanx for the reply

So how do I know when to use it...Can you please give me a scenario...
Thanx
Developer
Aug 17, 2006 at 3:42 PM
Browse the WIKI. You will find some info and examples there.