Build a CityJSON Metadata Extent Coordinate Validator

Parse CityJSON 2.0 metadata objects to verify geographical extent bounding coordinates. Calculate actual dataset bounds from decompressed vertices and flag metadata discrepancies.

Municipal Tax Assessor

Ingest CityJSON 2.0 models and extract the root metadata geographicalExtent array.

Decompress integer coordinates from the vertices array using the transform object.

Calculate the true min/max spatial bounding box enclosing all decompressed vertices.

Generate a metadata discrepancy report comparing declared extents versus calculated bounding boxes.

Browser validation portal showing calculated vs declared extents and bounding box error warnings.

Author synthetic CityJSON 2.0 documents with '+' prefix extension object types and custom attributes. Starter examples below are synthetic. They are not downloaded records.

CityJSON Applies CityJSON Section 5 Metadata object specifications to validate geographicalExtent arrays.

mastra-ai, typescript, zod. Mastra AI orchestrates schema loading, regex pattern verification, and diagnostic error explanation. Instruction-tuned LLM capable of schema parsing and concise error reporting via API.

Submit runnable source, pinned dependencies, setup commands, a working interface, example outputs, and a recorded end-to-end demo. Include tests and an action log.

Calculates true bounds accurately from integer decompressed vertices.

Identifies files where metadata extent deviates from actual geometry.

Validation report returns status and calculated geographical boundary mismatch distances.

```json [ { "input": { "type": "CityJSON", "metadata": { "geographicalExtent": [ 0, 0, 0, 100, 100, 50 ] }, "calculated_bounds": [ 0, 0, 0, 100, 100, 50 ] }, "expected_output": { "extent_declared": true, "mismatch": false, "max_deviation": 0, "mapping_valid": true } }, { "input": { "type": "CityJSON", "metadata": { "geographicalExtent": [ 0, 0, 0, 50, 50, 20 ] }, "calculated_bounds": [ 0, 0, 0, 100, 100, 50 ] }, "expected_output": { "extent_declared": true, "mismatch": true, "max_deviation": 50, "mapping_valid": false } } ] ```

Validator checks syntax and schema metadata only; it does not alter statutory property tax records. Use mock external writes. Require human review before any real deployment.