Need help converting table back to `geotable` after removing and adding back `Shape` column for optimization
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Hi,
I have a large geotable containing census tract polygons that I need to join with some exposure data. To optimize the innerjoin operation, I removed the Shape column from the geotable and performed the join on the resulting regular table. This significantly improved performance.
However, now I need to convert the resulting table back to a geotable with the polygon data. I've tried using both table2geotable and readgeotable functions, but I'm encountering issues
Questions
- What's the correct way to convert my table back to a geotable after adding the Shape corresponding to polygons column back?
- Is there a better approach to optimize the join operation while preserving the geotable structure?
Any help would be greatly appreciated!
Thanks,
Praful
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回答(1 个)
Vidhi Agarwal
2025-7-3
How to convert a table back to a geotable after removing and later adding back the Shape column: To restore your table to a geotable after optimizing joins by removing the Shape column, reattach the Shape data by joining your result table with a table containing the key and Shape columns. Once the Shape column is added back and contains valid polygon objects, your table functions as a geotable—use table2geotable if explicit conversion is required.
Is there a better way to optimize the join operation while preserving the geotable structure: The most efficient approach is to temporarily remove the Shape column before joining, as this avoids the overhead of handling large geometry objects. After completing the join on the smaller tables, add the Shape column back using a join on the key. This method balances speed and preserves geospatial information.
To understand more about "table2geotable", run the following command in MATLAB window and you can read the documentation:
web(fullfile(docroot, "map/ref/table2geotable.html"));
Hope this help!
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