Get Tile Info during custom importer

[weierstrass1]

I want to know, if it is possible to know information about each tile of the tilemap when i use a custom importer. I need this because i am implementing a custom terrain interaction system and my system needs to know what pattern is used by each tile and then get custom attributes from that pattern.

For example if i have patterns with like this:

Then if i build a map with those patterns i need to know what pattern is used for each of the tiles and then get the attribute "BlockType".