I am currently attempting to create a contour map from elevation data. The shapefile with the elevation points are clustered in a study area, but there are two outlying points that were used as backsites from the survey. I created a polygon to serve as a SiteOutline and attempted to Convert to Grid in order to establish an Analysis mask for the contour line creation in Spatial Analyst. Unfortunately, I received an "Error: Segmentation Violation" message. Is this because of the outlying points since I did not, nor do I want to, include them in the SiteOutline shapefile? Should I go back to the original data and eliminate these points from the shapefile? Thanks!