The Warp Operation T he Warp operation is a rubbersheeting operation. It is used to stretch, rotate, and otherwise reshape one map layer to match the geometry of another map layer. T he Warp operation employs a technique called image to image geocorrection.
Tie points are cells in two maps that are at the same location in space.
For example, the cell representing a road intersection, visible in the map to be warped and the reference map, could be used as a tie point. Other good tie points are bench marks, towers, buildings, small islands, and bridges. Tie points should be evenly spaced across the map and there should be some that fall along all edges of the map. T his air photo will be altered using the Warp Operation. We will reproject this map based on the geometry of the road map below.