What textbook would you recommend for learning GIS?

Question

IT education

Good afternoon!
For educational purposes, I want to try to implement my own simple GIS.
Accordingly, we need a textbook that tells about the main ways of presenting data, about the algorithms used in this area and the mathematical foundations.
Thanks in advance

Answer 1

I was doing GIS on the web, these resources helped me a lot:
gis-lab.info
williams.best.vwh.net/avform.htm
habrahabr.ru/post/228023