Map textures

[cant remember]

How can I extract the textures of the rader of all three GTA's?

I only want to if they are in scale with eachother (eg. 50 pixels on all three maps would all be the same distant inside the game).

The reason I want to do this is because I wan't to be able to compare the maps in size and I assumed that extracting the radar textures would be the most accurate way to get the three maps and also have them being relative to eachother in size.

What i'd also like are maps of the GTA1 and GTA2 areas which weren't coloured etc. to look better, and that are also correct in scale, eg. 1 pixel, or 2x2 represent a block in-game etc.