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Aerial triangulation
2011
Relative orientation report parameters
The window consists of two tabs – Main parameters and Additional.
Main report parameters
The Show report section allows to define images, which will be analyzed for the report: all
images of a block or selected images with addition of adjacent ones if necessary.
To check measurements for vertical parallax error select the Check vertical parallax option
and input acceptable threshold value (in pixels or mm) for selected error type (RMS, mean or
maximal error). It is recommended to reject points with vertical parallax which exceeds image
pixel size.
To perform accuracy control of measurements in triplets select the Check residuals in
triplets option and input acceptable threshold value in XY and Z (in pixels, mm or meters) for
selected error type. Acceptable residual for maximal error in triplets could be calculated using
the following formula:
E max  2  E mean , where E mean - mean error
Mean triplet errors in XY plane should not be greater than half of pixel size multiplied by √ 2,
error by Z equals the mean triplet errors value in XY plane multiplied by the ratio of focal
length (f) to survey basis (b) (in image scale). See below:
xy
E mean
 2  0.5 pxl
z
E mean

97
f
xy
 E mean
b
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