[OSM-dev] Call to mobile developers: OSM binary file format

Chris Browet cbro at semperpax.com
Thu Aug 7 10:03:05 BST 2008

> Do you intend to save all the data OSM has
> or only support a subset required for routing
> and map-rendering?

The idea is to have a binary format specification.
The actual organization of the files will be up to the application.

> Do you think about floating-point or fixed-point
> coordinates?

This is one of the things to discuss. For mobile applications, fixed-point
is the most efficient but we have to balance this with the loss of
Another point is to determine whether the binary format should be
"reversible" into XML OSM.

> We could start by collecting the requirements of everyone.

More than the requirements, the actual existing implementations.
But, as I said, I'd like to be sure that we reach a criticial mass before
spending hours documenting my own implementation.
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