How accurate is PhotoModeler?

The accuracy of a final PhotoModeler measurement depends on a number of factors: the resolution and number of photographs, the angles between the photographs, the number of referenced points, and the quality of the camera. PhotoModeler’s accuracy ranges from 1 in 200 for low-resolution photographs (e.g. for a six foot object, measurements will be within a third of an inch), to 1 in 8000 for high-resolution photographs (for the same six foot object, within one one hundredth of an inch).

For projects requiring high accuracy, PhotoModeler has tools for obtaining up to 1 part in 25,000 and higher accuracy. This can be achieved with combinations of targets (for use with the Sub-Pixel Target Marking tool) and high resolution cameras. Several accuracy studies have been conducted that support PhotoModeler’s accuracy statistics.

The following table lists some approximate precisions one can expect for projects using the following camera types. These figures are based on projects using manual marking, except for the last row which uses targets and the Sub-Pixel marking tool. *The "50′ object" columns show precision values on an arbitrary 50′ object filling the image.