Extract data from underlying layer for polyline

[GemmaBarrett]

I'm relatively new to ArcGIS and am having trouble finding out how to resolve the problem i'm having. Any help would really help me out!

I have georeferenced aerial images onto the World_Imagery bundle supplied by ArcGIS Online. I have drawn polylines along the aerial images along the coastlines, but need to extract the coordinates of these polyline coastlines in order to analyze the data against the polyline data for other aerial images.

How can I extract this information from the underlying layer? Either the World imagery or my georeferenced aerial images. I have been told I can use spatial analyst for this but have been unsuccessful at extracting the data.

Thank you for any help that you can provide!

[JohnSobetzer]

I'm a bit unsure of what you have done and what you need.  If you have digitized the shoreline into a shapefile or geodatabase feature class then you data that can be visually compared to your other data, and run through some of the analysis functions.  If you digitized it into graphics then you can use the Drawing - Convert graphics to features option to convert them to shapefiles or feature classes.  If you want to convert the vertices of these lines to coordinates, then you can use various tools like the Data Management Tools - Features - Feature to Point and Add XY Coordinates tools.  If you don't have ArcInfo ET Geowizards has a line to point wizard.  There may be an Arcscript to do what you want as well - check ESRI support downloads.