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Editorial Team
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Asked: 2026-06-11T09:32:40+00:00

I am very new to the spatial realm of SQL Server and need some

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I am very new to the spatial realm of SQL Server and need some help. I have a waypoint organizing app and I am trying to generate some queries that follow along the premise of finding waypoints that are part of geographic polygons like lakes, rivers, etc. I have preloaded my tables with data I have downloaded. I used shape2sql.exe to load shapefiles into the appropriate db tables.

Tables are as follows:
Water table – id, name, geog(geography data type)
State table – id, state_name, state_abbr, geog(geography data type)
County table – id, name, state_name, geog(geography data type)
Waypoint table – id, name, lat, lon, waterid

How do I write queries against these tables to return things like:
– all waypoints in ‘michigan’
– all waypoints on ‘bass lake’ in ‘montcalm’ county in ‘michigan’ (there are multiple bass lakes in michigan and the country hence the county/state part)
– auto assign the water id column of the waypoint table by “processing” a group of waypoints and finding what lake they actually belong to
– etc.

Thanks!

Learned so far:
select geog.ToString() as Points, geog.STArea() as Area, geog.STLength() as Length
from water
where name like ‘%bass lake%’ and STATE = ‘mi’

will return the record for Bass Lake and the polygon with the actual coordinates for the lake.
POLYGON ((-87.670498549804691 46.304831340698243, -87.670543549804691 46.307117340698241, -87.676573549804687 46.313480340698241, -87.68120854980468 46.314821340698245, -87.685168549804686 46.315703340698242, -87.6877605498047 46.313390340698241, -87.685051549804683 46.308827340698244, -87.682360549804685 46.305650340698243, -87.677734549804683 46.304768340698246, -87.674440549804686 46.304336340698242, -87.670498549804691 46.304831340698243)) 1022083.96662664 4027.52433709888

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1 Answer

  1. Editorial Team

    Ok – learning as I go so here are some answers to my own questions for anyone what would like to know.

    Here is one query for finding various waypoints with conditions in the where clause:
    SELECT * FROM WaypointTable wp
    JOIN WaterTable w
    ON wp.geogcolumn.STIntersects(w.geogcolumn) = 1
    WHERE w.name LIKE ‘%bass lake%’
    AND w.state = ‘mi’;

    Here is a query for assigning water id’s to waypoints based on where they ‘fit’:
    UPDATE WaypointTable wp
    SET WaterID = (
    SELECT ID
    FROM WaterTable
    WHERE geogcolumns.STIntersects(wp.geogcolumn) = 1
    );

    Both of these queries work extremely well and fast! Love it!

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