Question 1

How do I encode GeoJSON to Mapbox Vector Tiles with Orb?

Accepted Answer

Use the geojson sub-package to unmarshal GeoJSON into FeatureCollections, then pass them to the encoding/mvt package for projection, clipping, and simplification before marshaling. The README provides a step-by-step example including ProjectToTile and Simplify methods.

Question 2

Orb vs go-geom: which is better for geospatial data in Go?

Accepted Answer

Orb emphasizes idiomatic Go design with slice-based types and better integration for GeoJSON and MVT, while go-geom follows a more traditional struct approach with different geometric primitives. Choose Orb for modern Go practices and format support, but go-geom for alternative API styles.

Question 3

Can I use Orb for real-time geofencing applications?

Accepted Answer

Orb provides geometric types and algorithms like quadtrees for spatial indexing, which can be adapted for geofencing. However, for high-performance real-time needs, you might need to implement custom optimizations or benchmark against lower-level libraries due to Go's runtime overhead.

Question 4

How to simplify a polygon using Douglas-Peucker in Orb?

Accepted Answer

Import the simplify sub-package and apply the DouglasPeucker function with a tolerance parameter to your geometry. For example, use simplified := simplify.DouglasPeucker(1.0)(geom) after ensuring the geometry is in the correct coordinate space, as shown in the MVT encoding example.

Question 5

Does Orb support spatial database functions like ST_Intersects?

Accepted Answer

Orb focuses on geometry manipulation and encoding, not full spatial database operations. It can scan WKB data from queries, but for functions like ST_Intersects, you'd rely on the database (e.g., PostGIS) and use Orb to handle the geometry data in Go after retrieval.

Question 6

How to install Orb and set up a basic project?

Accepted Answer

Use go get github.com/paulmach/orb to install. Start by importing the core package and relevant sub-packages like geojson or encoding/mvt. Refer to the GitHub repository and Go package documentation for examples, as the README includes code snippets for common tasks.

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