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Loading Tiled Imagery into Mappt

select_tiled_map_layer

Last week I posted an article about Mappt supporting Compact Cache Bundles but did you know it already supports tiled imagery.  The difference between the two is that tiled imagery is exploded so each tile is it’s own image file.  There are three bit’s of information a tile needs to display on a google map.

  • The Level of Detail (LOD)
  • X position and
  • Y position

Tiling programs generally create a directory hierarchy to define these three properties.

Directory tile hierachy

Here the first directory is the LOD.  The next is the X location and the filename is the Y.   This is the most common structure but occasionally you will come across tiles with a single filename that contains the LOD, X and Y separated by an underscore character:

tile_hierachy_small

Mappt is capable of using both of these tiled images formats.  Just transfer the tiles to the tablet via the USB cable and make note of where they are located.   Personally, I load them into the Mappt -> Downloads folder and use ER File Explorer to  verify the exact path to the tiles.

es_file_explorer_path

Now select ‘Tiled Map Layer’ from the ‘Add/Load layer dialog’.

select_tiled_map_layer
Enter a name for the new layer and then type in the path to the tiles.

view layers

The important part here is the fields surrounded by the curly brackets ‘{zoom}/{x}/{y}.png’ .  This part defines the structure of the tiles as discussed above.