GEOG 222.3 Lecture Notes - Lecture 47: Triangulated Irregular Network, Bilinear Interpolation
Document Summary
If a map does not have the coordinate, you have to assign the coordinate so it will match with the earthen the other data layer. The process is classed ( a map without the coordinate ) - geo referencing. Converting them into the same projection (same datum) - reprojection. Through certain points, you can do the transformation - control points. How do you select the control point - easily identi able, landmark, you should know the projection coordinate. When you are transformation information into another cell, you are not only transferring the data but the location / coordinate. Sampling - result of geometric translation of an image is a new image based on given coordinate system. It is not the most accurate, you have to calculate the distance between each pixel to determine which one is the closest: bilinear interpolation: You can keep the linear feature straight although the resolution will go down: cubic convolution method:
