Help: Retrieve value from a column if a certain condition is met

[VictorK]

Dear SAS experts

I have a dataset containing coordinates for moving persons with a new latitude and longitude for every 10 seconds. The dataset also contains coordinates for their goal location. I would like to create a new column showing the time value when a person reaches the goal location (i.e. latitudeX and longitudeX match goal_latitude and goal_longitude, respectively). I consider the person to have arrived when he is within 0.0005 of goal coordinates.

	goal_latitude	goal_longitude	new_column	time1	latitude1	longitude1	time2	latitude1	longitude1	...
person1	55.7236	12.4472		2023-08-03T19:55:18.000+02:00	55.7215	12.4422	2023-08-03T19:55:28.000+02:00	55.7215	12.4424
person2	55.7234	12.4418		2023-08-03T19:55:01.000+02:00	55.7225	12.4368	2023-08-03T19:55:08.000+02:00	55.7226	12.4368
person3	55.7256	12.4435		2023-08-03T19:55:37.000+02:00	55.7247	12.4389	2023-08-03T19:55:38.000+02:00	55.7247	12.4389

Can this be done in SAS Enterprise Guide?

I have already tried with a very long CASE-statement:
CASE
WHEN (INPUT(t1.latitude1,8.))<(INPUT(t1.goal_latitude,8.) + 0.0005) AND (INPUT(t1.latitude1,8.))>((INPUT(t1.goal_longitude,8.) - 0.0005)) AND (INPUT(t1.longitude1,8.))<(INPUT(t1.goal_longitude,8.) + 0.0005) AND (INPUT(t1.longitude1,8.))>((INPUT(t1.longitude,8.) - 0.0005)) THEN (t1.time1)

...

ELSE 0

END

And I got this error message: "ERROR: Result of WHEN clause 2 is not the same data type as the preceding results."

Thank you for your help!

VictorK

[Patrick]

Please provide your sample data and the desired outcome using this sample data via a working SAS data step that creates such data. 

You have a much better chance of anyone actually providing tested code if we don't have to spend time creating such sample SAS datasets prior to actually creating the code you're after.

[VictorK]

The dataset I'm working with is very large, but here are an example for one goal location.