decode_elements

osm_pbf::decode

Function decode_elements 

Source 
pub fn decode_elements<'a>(
    _: PrimitiveBlock,
) -> impl Iterator<Item = Result<Element, DecodeError>> + 'a
Expand description

Decode a PrimitiveBlock into an Element stream

There is no dependency on order, so this can be called in parallel. Technically, the file format is (<HeaderBlock> (<PrimitiveBlock>)+)*, but [FileBlock::Header] and [FileBlock::Other] don’t contain any elements.

A number of hydration steps are performed:

  • String table indices ==> actual strings
  • Positions packed as granularity, offset, value ==> positions with Decimal
  • Timestamps packed as date_granularity, value ==> timestamps with NaiveDateTime
  • Dense nodes => Nodes
  • Delta-encoded values => actual values

https://wiki.openstreetmap.org/wiki/PBF_Format#Encoding_OSM_entities_into_fileblocks