Exporting rasters to Mbtiles using GDAL

Web maps are generally made up of many small, square images called tiles, which are placed side by side in order to create the illusion of a very large seamless image [for a good explanation, see here].

Tiled based maps can be made up of many tiles. Loading all those tiles would be inefficient and slow. That is where the MBtiles, developed by Mapbox, come in. The MBtiles specification is an efficient format for storing millions of tiles in a single SQLite database.

I have written before about Tilemill, a great tool to create great looking interactive maps. Since then more tools have come available to create MBtiles. Continue reading “Exporting rasters to Mbtiles using GDAL”

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Locus Map Pro carries its support for MBTiles to the next level

I wrote before about the MBtiles format, a convenient format to store tiled maps in a single portable sqlite database. Probably the easiest way to create them is with Tilemill, as described here. The format is supported by amongst others QGIS, but it is especially suitable for use with map viewers on your mobile device.

The format is now supported by various mobile map viewers, including e.g., Geopaparazzi and OruxMaps. One I like for its rich set of features is Locus Map Pro. I normally only write about open source, but I think the developer of this app deserves some credit for being one of the first (as far as I am aware of) to support the MBtiles format.  Up to very recently you could only view maps in MBtiles format (similar to the other viewers mentioned above), but with the latest update support for the UTFgrid feature has been added.This basically adds interactivity to your map.
Continue reading “Locus Map Pro carries its support for MBTiles to the next level”