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Known Limitations

GeoBrix Beta has some known limitations that will be addressed in future releases.

Databricks Spatial Types​

Current State​

The Beta does not yet support Databricks Spatial Types directly but is standardized to WKB or WKT where geometries are involved.

Workaround​

Convert GeoBrix output to Databricks types:

Convert to Databricks GEOMETRY Type
from pyspark.sql.functions import expr

# Read with GeoBrix
df = spark.read.format("shapefile_ogr").load("/Volumes/main/default/geobrix_samples/geobrix-examples/nyc/subway/nyc_subway.shp.zip")

# Convert to Databricks built-in GEOMETRY type
geometry_df = df.select(
    "*",
    expr("st_geomfromwkb(geom_0)").alias("geometry")
)

# Now use built-in ST functions
result = geometry_df.select(
    "geometry",
    expr("st_area(geometry)").alias("area")
)
result.limit(5).show()
Example output
+------------------------------+-----+
|geometry                      |area |
+------------------------------+-----+
|SRID=4326;POINT (-73.99 40.73)|0.0  |
|SRID=4326;POINT (-73.98 40.75)|0.0  |
|...                           |...  |
+------------------------------+-----+

Function Availability​

A handful of functions from DBLabs Mosaic are not yet ported:

RasterX​

  • rst_dtmfromgeoms - Digital Terrain Model from geometries

VectorX​

  • st_interpolateelevation - Interpolate elevation values
  • st_triangulate - Triangulation operations

GridX​

  • Custom Gridding - Not fully ported

Spatial KNN​

Spatial K-Nearest Neighbors is not yet ported:

  • No KNN operations currently available
  • H3 support for Geometry-based K-Ring and K-Loop not included

Coordinate Reference Systems (PROJ version skew)​

GeoBrix's GDAL stack and DBR's built-in spatial functions each carry their own PROJ runtime — they coexist on the cluster but are not the same library, and the two PROJ versions can diverge slightly:

  • GeoBrix's GDAL links to the PROJ shipped in the cluster init bundle (currently PROJ 9.4.1, from the UbuntuGIS PPA build of libgdal37). Installed at /usr/lib/x86_64-linux-gnu/libproj.so.25.
  • DBR 17.3 LTS's built-in ST_* functions link to PROJ 9.7.1, bundled with the runtime under /databricks/native/ (with PROJ_DATA=/databricks/native/proj-data). Not registered with ldconfig and not installed via apt — fully isolated from /usr/lib.

The two run side-by-side in the same JVM/Python process without conflict, because they're loaded from distinct paths. The cost is CRS-catalog skew at the edges: any EPSG code added or refined between PROJ 9.4.1 and 9.7.1 (newly-added projections, updated grid-shift definitions, transformation pipeline changes) may be interpreted slightly differently by a GeoBrix function vs. a DBR built-in operating on the same geometry.

For the common EPSG codes you're most likely to use day-to-day — EPSG:4326, EPSG:3857, EPSG:27700, the UTM zones — this is invisible. For freshly-added projections or very precise datum transformations, it may surface.

If you run into a CRS-related discrepancy between a GeoBrix function and a DBR ST_* built-in on the same input, please file an issue with the EPSG code and a minimal repro — that's the signal we'd use to prioritize rebuilding the GeoBrix GDAL stack from source against DBR's PROJ in a future release.

Compute Requirements​

GeoBrix requires Databricks Classic Clusters:

  • Not currently compatible with Serverless compute
  • Requires GDAL native libraries via init script, which are currently only supported on classic clusters
  • Non-ARM instance types only (Intel or AMD x86_64). The GDAL bundle ships amd64 .debs from the UbuntuGIS PPA — amd64 and x86_64 are the same architecture, and Intel and AMD CPUs are interchangeable. ARM-based instance types — AWS Graviton, Ampere, Apple Silicon — are not supported. The init script fails fast on aarch64.

Databricks Runtime:

  • Minimum: DBR 17.1 (recommend DBR 17.3 LTS or later)
  • GeoBrix is designed to work with Databricks product spatial functions (available DBR 17.1+)

Format Support​

  • OGR - focus is on named vector readers in GDAL's OGR package.
  • GDAL - focus is on GeoTiff (named raster reader).
  • Advanced features of some formats may have limited support.

Next Steps​