GIS 311 Lecture Notes - Lecture 2: Bilinear Interpolation, Affine Transformation, Georeferencing
30 Nov 2017
School
Department
Course
Professor
Document Summary
Week 2: raster data: georeferencing and transformations: describe how georeferencing differs from defining a projection or projecting a gis file: Georeferencing connects control points between an image without spatial data to x/y coordinates on a spatially referenced dataset. Identify the major components of an affine transformation. Ensures that parallel lines will always stay parallel. Scales, skews, rotates, translation, and projection over small areas. Linear transformation between two vector spaces, where the ratio of distances is maintained. Identify examples of affine transformations, second- or third-order polynomial transformations, and splining: explain the basic logic behind the nearest neighbor, bilinear interpolation, and cubic convolution resampling algorithms. Analyze the difference in raster output generated through different resampling techniques: nearest neighbor assignment is the choice for descrete data, since it does not alter the value of the input cells.
