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Module feature

geonative_core

Module feature 

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The “feature” — one row in a spatial dataset.

§Shape

A Feature is the trio you’d expect from anything geospatial:

  • fid — optional row identifier (FileGDB OBJECTID, Shapefile record number, GeoJSON’s free-form id). None for formats that don’t track one (raw GeoJSON FeatureCollections, Arrow record batches).
  • geometry — optional Geometry. None for attribute-only tables (GDB system tables, DBF-only Shapefiles, the Layer for a non-spatial PostGIS view).
  • attributes — Vec<Value> in Schema::fields order. Length must equal the schema’s fields.len(); readers / writers enforce this contract at row build time.

§Why a Vec and not a HashMap<String, Value>

Format readers/writers care about field order: DBF stores columns in a fixed sequence, Arrow batches map column index to field, FileGDB rows emit nullable bitmap bits in declared order. A HashMap would lose this and double the per-row allocation cost. Name lookup is available via Schema::field_index(name).

Structs§

Feature