Thanks for your response.
Vatsa, December 11, 2023 - 3:07 pm UTC
I forgot to mention that the polygon data for the congressional districts in the table is ia CLOB and not SDO_GEOMETRY. Given a lat and long I want to find out which congressional district are those coordinates in.
Sorry for not being clear the first time.
Thanks
Vatsa
convert wkt to sdo_geometry
good luck, December 17, 2023 - 12:07 pm UTC
If you want to do spatial queries, you need to use sdo_geometry objects. You can convert the clob to a polygon dynamically in the query using the function sdo_util.from_wktgeometry
sdo_util.from_wktgeometry(your_clob_column)
Load geojson as SDO_GEOMETRY
Karin Patenge, January 08, 2024 - 8:49 am UTC
Vatsa,
Besides the conversion functions provided by the SDO_UTIL package, you can also load GeoJSON data via Oracle Spatial Studio. It automatically creates SDO_GEOMETRY objects from your GeoJSON.
Then, simply use SDO_RELATE with mask=INSIDE/ANYINTERACT or SDO_INSIDE/SDO_ANYINTERACT get your containment question answered.
Karin
Thanks for your response.
Vatsa, April 30, 2024 - 12:23 pm UTC
I converted the BLOB column to SDO_GEOMETRY using the function, but when I tried to plot the polygon using the converted column it does not draw the polygon. So, I am not sure if the conversion has happened correctly or if I am missing something.
May 20, 2024 - 1:17 am UTC
If you could build a tiny test case either in APEX on apex.oracle.com or just in plain SQL, so we can better understanding when you are trying to do.
Converted CLOB to SDO Geometry
Vatsa, May 20, 2024 - 3:01 pm UTC
Here is the table
PM_CONGRESSIONAL_DISTRICTS
ID NUMBER
GEOMETRY CLOB (Contains the polygon data for US congressional districts in GeoJSON format)
PARTY varchar2(1)
STATE varchar2(2)
DISTRICT Varcha2(200)
FIRSTNAME, LASTNAME, etc...
I converted the geometry column that is clob to SDO_GEOMETRY using the following query.
Select sdo_util.from_wktgeometry(GEOMETRY) as GEOM, ID, DISTRICT, FIRSTNAME, LASTNAME,
FROM PM_CONGRESSIONAL_DISTRICTS
When I tried to plot the conversted GEOM column on a map, it does not show on the map.
However, when I just use the CLOB column and use it as GeoJSON column, the polygon is showing up.