Historic resource use and occupancy of any geographic resource area has changed over time.

Significant historical relationships between the land tenure, the resource uses, 
and the moral and legal rights of occupancy mapped over time reveal relationships between human impacts and the environment.

Database development and interface is an important part of research into all of the elements found on a specific piece of property. Mining, riparian areas, agriculture, geology and watershed have been recorded throughout history throughout California lands.

Geographic Information Systems mapping is one method of layering over time the activities found to have taken place on a specific location.