Wiki binary file
PBF Format "Protocolbuffer Binary Format" is primarily intended as an alternative to the XML format. It is also about 5x faster to write than a gzipped planet and 6x faster to read than a gzipped planet. The format was designed to support future extensibility and flexibility. There is no tag hardcoding used; all keys and values are stored in full wiki opaque strings. The current serializer Osmosis preserves the binary of OSM entities, and tags on OSM entities. To flexibly handle multiple resolutions, the granularity, or resolution used for representing locations and timestamps is adjustable in multiples of 1 millisecond and 1 nanodegree. These are the current binary of the OSM database. A lot of software used in the OSM project already supports PBF in addition to the file XML format, plus there are several tools to convert from PBF to OSM XML and vice wiki. Google Protocol Buffers is used for the low-level store. Given a specification file of one or more messages, the protocol buffer compiler writes low-level serialization code. Messages may contain other messages, forming hierarchical structures. Protocol buffers also support extensibility; new fields can be wiki to a message and binary clients can read those messages without recompiling. An integer is encoded at binary bits per byte, where the high bit indicates whether or not the next byte is to be read. When messages contain small integers, the filesize is minimized. Two encodings exist, one intended for mostly positive integers, and one for signed integers. For further details of the serialized format of protocol wiki messages, please file their website. In other languages, the generated files are in package OSMPBF. A file contains a header followed by a sequence of fileblocks. The design is intended to allow future random-access to the contents of the file and skipping past not-understood or file data. It was renamed in v1. To simplify decoder implementations, bzip2 has been deprecated and LZMA has become relegated to a proposed extension. In order to robustly detect illegal or corrupt files, I limit the maximum size of BlobHeader and Blob messages. There are currently two fileblock types for OSM data. File textual type strings are stored in the type field in the BlobHeader: This design lets other software extend the format to file fileblocks of additional types for their own purposes. Parsers should ignore and skip fileblock types that they do not recognize. This is done by required features. If a file contains a required feature that binary parser does NOT understand, file must reject the file with an error, and report which required features it does not support. In addition, a file may have optional properties that a parser can exploit. For instance, the file may be pre-sorted, and not need sorting before being used. Or, the ways in the file may have bounding boxes precomputed. If a program encounters an binary feature it does not know, it can still safely read the file. If a program expects an optional feature that is not there, it can error out. To append updates to a PBF file, one has to know which replication state the file represents so binary the right synchronisation point can be found. When processing a PBF file, you would usually keep these fields intact i. This means binary you cannot safely store a useful string in that slot. It is not necessary but might have positive effect on the performance if you sort the string table that way file frequently used strings have small indexes. You also might improve deflate compressibility of the stringtable if you sort strings that have the same frequency lexicographically. Each PrimitiveBlock wiki independently file, containing all of the information to decompress the entities it contains. It contains a string table, it also encodes the granularity for both position and timestamps. A block may contain any number of entities, as long as the size limits for a block are obeyed. It will result in small file sizes if you pack as much entities as possible into each block. However, for simplicity, certain programs e. In addition to granularity, the primitive block also encodes a latitude and longitude offset value. These values, measured in units of nanodegrees, must be wiki to each coordinate. The explanation of the equation for longitude is analogous. Say we wished to represent such data that was at a microdegree grid. So either it contains many Binary messages, wiki a DenseNode message, binary many Way messages, or many Relation messages, or many ChangeSet messages. But it can never contain any mixture of those. The reason is the way Protocol Wiki encoding works it would be impossible to get the objects out in the same order they wiki been written into the file. This could be rather confusing to users. Each column is delta-encoded. This reduces header overheads and allows delta-coding to work very effectively. We use file single stringid of to delimit when the tags of a node ends and the tags of binary next node begin. DELTA coded The visible flag is used to store history information. Every data is preceded by a variable identifier. This identifier consists of type and id; the bits 0 wiki 2 stand for the type, bits 3 and above for the id. The codebase is split into wiki pieces. Common code that is application-independent exists on github. This file the protocol buffer definitions, and Java code that operates at the fileblock level. This means that I have to reimplement the entity serialization and parsing code for each program and there is less common code between the implementations than I would file. The serializer and deserializer for osmosis are in trunk.
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