Terrestrial Recording Strategies - 4. Difficulties while recording

The photogrammetry process might be impaired by several issues, so it is best to steer clear of:

• over- and underexposure
• reflections of sunlight (they appear as blind spots)
• changing lighting conditions
• snow cover
• water
• blurred pictures due to low motion sharpness
• overlapping objetcs (like plants)
• moving objects (they cannot be processed by the software)
• smooth or reflecting surfaces (like >30% of the object is glass or blank surfaces like steel or other industrial metal)
• similar structures
• too much background in the picture frame

Even if all the rules are applied the recording might be affected by its surroundings. So, here are a couple of troubles to consider, while recording: 

• Vegetation is in the front of the object and does not allow a direct visual contact to the object.
• A difficult terrain or obstacles, so the recording possibilities are already limited by the environment.
• Places that are not accessible generally with the camera in hand 
• What can be done with those than?