Advantages

Advantages

Cost-effectiveness.
Close range photogrammetry is generally less expensive than any other method of measuring. The cost-effectiveness of the system increases whit the amount of details and the complexity of the object and with the accuracy requested.
Using photogrammetry, the known cost-effectiveness of 3D CAD can be practically applied to rebuild projects.
Flexibility.
One of the main powers of the technique is its flexibility. It can handle objects of virtually any size, and it does not require the recording positions of the cameras to be known. Also because monoscopic photogrammetry uses convergent photographs, obstacles and restricted access to the object do not normally constitute a problem.
Higher Accuracy.
The accuracy of the photogrammetric recording can be calculated in advance and targeted to the purpose of the survey. It ranges generally from a relative accuracy of 1/1000 to 1/100000, which means that an accuracy of + 1mm is routinely achieved. With additional survey and analysis time and by taking more and closer photos, accuracy of about 20 microns can be reached.
Short recording time.
Actual recording time is very short compared with more traditional measurement methods. The object to be recorded is fully available once the photographs have been taken. Data is later extracted from the photographs, eliminating site visits to collect additional information.
In addition, because this type of data collection is much faster than traditional surveys, it limits the exposure of personnel to hazardous areas (extreme temperature, toxic materials, radioactivity, etc.).
Photogrammetry is also very suitable in areas where measurement requires an actual shutdown, the process down time is minimised, further reducing costs.
The images are reusable.
The photographs serve as an archive describing the state of the object at the time of the recording.
Because the images can be saved in a digital format, new measurements can be added at any time, without having to remeasure the object. You just use the photographs recorded in a previous session to perform some additional measurements. Furthermore, the images always provide a good overview of the situation at the time of recording, which gives you the opportunity to reconstruct a situation from the past when necessary.
Shorter Turnarounds.
Photographic recording of information and computer analysis of all data eliminates the need for most field notes and vastly reduces the time required to convert field measurement information into useable form. This also contributes to an improved schedule.
Results in 3D CAD Format.
Conventional measurement techniques would require the additional step of inputting data into a CAD system. With photogrammetry the data is already in a CAD format, thus eliminating a great deal of engineering cost and scheduling time.