On Tue, May 24, 2011 at 5:09 PM, Peter Körner <[email protected]>wrote:
> Am 24.05.2011 17:05, schrieb Igor Brejc: > > Not necessarily the same thing. Writing protobuf reader is still much >> easier than implementing something like >> http://www.sqlite.org/fileformat.html and >> http://www.sqlite.org/fileformat2.html >> > > You don't need to *imlement* sqlite on your own, just as well as you don't > need to implement the protobuf-reading and -writing on your own. There're > libs for it and you should use them. > > Peter > 1. There are various reasons why you _would_ need to implement your own reader of a file format, which can be project-specific (performance, additional functionality, not supported for your prog. language etc). 2. sqlite is not exactly a reader, it's a driver. To actually read the data, you need to run a query through that driver. This is one of the reasons I don't see it as a pure shapefiles replacement. 3. When talking about protobuffers, there is a distinction between a general-purpose library implementing the protobuff protocol and a reader which uses this library to read a concrete binary format. In the case of OSM PBF I had to write my own reader because there wasn't one implemented in C#. Igor
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