Question 1

How does osm compare to other Go OSM libraries like go-osm?

Accepted Answer

osm is more comprehensive, offering multi-format support (XML, JSON, PBF), GeoJSON conversion, and a full OSM API client, whereas go-osm might be lighter but less feature-rich. osm's scanner interface makes it better for large-scale data processing.

Question 2

How to parse a huge OSM PBF file without crashing my Go app?

Accepted Answer

Use the osmpbf subpackage's Scanner interface: initialize with New(), scan in a loop to stream objects one at a time, and close properly. This avoids loading the entire file into memory, as detailed in the README's streaming example.

Question 3

Can osm handle real-time OSM updates or changesets?

Accepted Answer

Yes, it supports changesets via the osm.Change type and includes a replication subpackage for fetching state and change files. However, for real-time streams, you'll need to manage concurrency manually since scanners aren't parallel-safe.

Question 4

What's the performance impact of using json-iterator with osm?

Accepted Answer

Benchmarks in the README show json-iterator can reduce JSON marshaling/unmarshaling time by up to 35%, but it may increase memory allocations slightly. It's best enabled for performance-critical applications processing large JSON responses.

Question 5

How to convert OSM ways to GeoJSON using osm?

Accepted Answer

Use the osmgeojson subpackage's Convert function: pass OSM objects like ways, and it outputs GeoJSON features with appropriate geometries (e.g., LineString for roads). This is compatible with osmtogeojson for consistent results.

Question 6

Does osm support authentication for the OSM API?

Accepted Answer

The osmapi subpackage provides basic support for OSM API endpoints, but authentication (e.g., OAuth) requires custom HTTP client configuration, as the README focuses on read/data endpoints without explicit auth examples.

Question 7

Is osm good for building a web service that serves OSM data?

Accepted Answer

Yes, with its API client and GeoJSON conversion, osm can backend services that fetch and serve OSM data. However, for high-traffic serving, you may need to add caching and handle scanner concurrency limitations to avoid bottlenecks.

osm

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