# Name of the model in memory that you use for map collision detection?

I'm trying to remember the English name for a memory model of a map built exclusively for handling collision detection. I think this is especially frequent in tile-based platform games.

I believe the Spanish term for it is "Mapa de durezas".

If you have a Super Mario tilemap like this:

    C     +        'P' = Pipe
+++       '+' = Brick
+++++      '@' = Ground
P   +++++++     'C' = Cloud
@@@@@@@@@@@@@@@@  ' ' = Air


Then the <ENGLISH EXPRESSION THAT I'M LOOKING FOR> of that map would be:

          *       '*' = Solid
***      ' ' = Traversable
*****
*   *******
****************


Any clues?