Every photogrammetric data processing begins with data collection. Sensor and data are the most vital part of any project,
usually the specification of a sensor is known at least to some extend before the data processing, therefore, the photogrammetric process could be started easily. Otherwise, a pre-calibration is required to know the sensor to an acceptable level of details.
Specifying details of a data measurement mission is the first critical step that is done after precise planning of the acceptable data. For example, some parameters such as percentages of overlaps or ground sampling distances should be known before starting an aerial photogrammetric project.
A critical aspect of a project is how to synchronize different sensors, so they capture data in the same moment or relatively known time differences. This is a critical aspect of most photogrammetric hardware projects. Usually synchronized trigger signal based on GNSS time stamps are used to capture data that is known in time domain.
Then it comes to data processing that involves pre-processing, filtering, and post processing. Modern photogrammetry has also the real-time data processing capability that produce the final results as soon as the data is captured, or with a small delay.