How To Pass Multiple Points (Polyline) To Image Service?

[asdfadsf]

I have an Image Service that I can pass an X,Y value to and it will return a Digital Elevation value to me. So for example, I can pass the service 10,10 and it will give me back 1,300. If I have a polyline with 100 points, I'd rather not call this service 100 times to get each elevation value. Is there a way to pass in the collection of points and get back a collection of elevation values?

Thanks in advance for the help!

[nicogis]

What's the operation that you use?

[asdfadsf]

What's the operation that you use?

I tried both Identify and REST. If you can't do this with an Image Service, should I be using a Map Service with a geometry type of Polyline?

TIA