An introduction to GIS Data Types. Strengths and weaknesses of raster and vector data are discussed. Also covered is the importance of topology. Concludes with a discussion of the vector-based format of OpenStreetMap data.
6. Points Points in the World Out There Vector Encoding Resulting Image 1 4 3 2 Point X Y 1 X 1 Y 1 3 X 3 Y 3 2 X 2 Y 2 4 X 4 Y 4 X Y
7. Lines Lines in the World Out There Vector Encoding Resulting Image Line X Y 1 X 11 Y 11 X 12 Y 12 . . . . . . X 1n Y 1n 2 X 21 Y 21 X 2n Y 2n 1 2 3 3 X 31 Y 31 X 32 Y 32 . . . . . . X 3n Y 3n 4 4 X 41 Y 41 X 4n Y 4n X Y Vertex Node