jiayuasu opened a new pull request, #3219: URL: https://github.com/apache/sedona/pull/3219
## Did you read the Contributor Guide? - Yes, I have read the [Contributor Rules](https://sedona.apache.org/latest/community/rule/) and [Contributor Development Guide](https://sedona.apache.org/latest/community/develop/) ## Is this PR related to a ticket? - No: this is a documentation update. The PR name follows the format `[DOCS] my subject` ## What changes were proposed in this PR? A new blog post on the **spatial statistics module** (`sedona.stats`), which currently has no blog coverage. It works through the classic exploratory-spatial-analysis workflow as one investigation on the OSM POI shapefile bundled at `docs/usecases/data` (12,873 points): - **Moran's I** — global spatial autocorrelation (is anything clustered at all?) - **Getis-Ord Gi\*** — hotspot significance on a geohash grid (where, exactly?) - **DBSCAN** — density clustering with spheroidal distances (what are the groupings?) - **Local Outlier Factor** — spatial anomalies (who doesn't belong?) - A closing section on how each primitive distributes (distance-join weighting, connected-components clustering, `ST_KNN`-based neighbor search) Includes a cover image and three figures rendered from the actual analysis results (hotspot z-score map, cluster map, outlier map). The post also notes the Spark checkpoint-directory requirement for DBSCAN and uses a `CAST(... AS DOUBLE)` on the count column for Moran's I — the integer-column failure behind that workaround is filed as #3218. ## How was this patch tested? - Every snippet was executed against Apache Sedona (PySpark, current snapshot jars) on the bundled shapefile; all numbers shown (Moran I = 0.2519 / z = 12.69, 26 significant Gi* hotspots with top z = 14.94, 72 DBSCAN clusters, LOF top outliers) are the real outputs of those runs. - The three figures are plotted directly from the exported results of the same runs; the implementation claims in the scale section were checked against the Scala sources (`Weighting`, `DBSCAN`, `LocalOutlierFactor`). - The site was built with `mkdocs serve` and the rendered post verified (all four images load, code highlighting, blog index entry). - SVG validated as well-formed XML; pre-commit hooks pass on the changed files. ## Did this PR include necessary documentation updates? - Yes, I have updated the documentation. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
