What is the three forms of geographical data?
The geographical datas are available in analogue or digital form.
Use of Computer (Practical Work in Geography)
The mapping software: mapping software provides functions for spatial and attribute data input through on screen digitation of scanned maps.
A digitised map consists of three files. The extention of these files are shp, shx and def. The def file is dbase file that contains attributes data and is linked to shx and shp files.