أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
Can you clarify more your question?
Hi
Use this Link , I hope you can find your answers
https://www.nationalgeographic.org/encyclopedia/geographic-information-system-gis/
HI HOW ARE YOU
YOU WILL FIND YOUR ANSWER HERE
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3056049/