Photo point monitoring is generally from a specific spot and view. You might want to get a GPS location, but it is often critical to have the camera in exact spot and frame picture the same way. You might set a post to support the camera on ans record compass reading and elevation, just in case of vandalism, storm damage, etc. You might place in the photo at a standard location for scale, date, time, site ID, etc. If documenting soil core, do your best to place soil materials from core oriented along a yard or meter scale or engineering rod if taking deep cores. Then, you might need to define how frequent to capture photos. If you start with forest site, clearcut or thin, burn, plant, and want vegetation successional changes through time, you will develop a plan to capture your intent, and then perhaps make room for storm damage, unplanned fire or site damage from unexpected activity as ATV traffic or drought, flood, etc. Make sure camera used can capture the fine detail needed, and set consistently each time.

I would recommend you this book -

Photo point monitoring handbook—Part A: Field procedures; Part B: Concepts and analysis by Frederick C. Hall

You can follow these links to learn about photo point monitoring -

https://www.fs.fed.us/eng/rsac/invasivespecies/documents/Photopoint_monitoring.pdf

https://www.epa.gov/sites/production/files/2017-10/documents/photo_point_webisode1.pdf http://www.nativerevegetation.org/learn/manual_2017/chpt6_monitoring/6_5_photo_point_procedures.aspx

https://efotg.sc.egov.usda.gov/references/public/NM/bio61a6_PhotoDocumentation_Protocol.pdf

Excellent info from Dr. Ahmed. In one of my early papers, I used examples of aerial photos through time (about every decade) to show changes in gully extent and adjacent barren lands, etc. Also, aerial photo pairs can sometimes be taken or adjusted in scale if needed to help show time series, 3D detail, and some old reports used technique with stereoscope to help show some elevation detail.