GIS_DISTANCE: Calculating the Distance Between Geometry Points

Syntax: How to Calculate the Distance Between Geometry Points

GIS_DISTANCE(geo_point1,geo_point2)

where:

geo_point1,geo_point2

Fixed length alphanumeric, large enough to hold the JSON describing the point (for example, A200).

Are the geometry points for which you want to calculate the distance.

Note: You can generate a geometry point using the GIS_POINT function.

Example: Calculating the Distance Between Two Geometry Points

The following uses a citibike .csv file that contains station names, latitudes and longitudes, and trip start times and end times. It uses the GIS_POINT function to define geometry points for start stations and end stations. It then uses GIS_DISTANCE to calculate the distance between them.

DEFINE FILE esri/esri-citibike
STARTPOINT/A200 = GIS_POINT('4326', START_STATION_LONGITUDE, START_STATION_LATITUDE);
ENDPOINT/A200 = GIS_POINT('4326', END_STATION_LONGITUDE, END_STATION_LATITUDE);
Distance/P10.2 = GIS_DISTANCE(ENDPOINT, STARTPOINT);
END
TABLE FILE esri/esri-citibike
PRINT END_STATION_NAME AS End Distance
BY START_STATION_NAME AS Start
ON TABLE SET PAGE NOLEAD
END

The output is shown in the following image.

	WebFOCUS