IMPA Selection of the photo points
Columns | format | contents/explanation |
|---|---|---|
1-4 | A4 | IMPA |
6-10 | I5 | RAYS: Selection of the points according to the number of photo rays. 1 :Points having been measured in less than two photos are excluded from the adjustment (including control points). 2 :Points having been measured in less than two photos are excluded from the adjustment (excluding control points). 3 :Points having been measured in less than three photos are excluded from the adjustment (excluding control points). If all photos are of the type “aerial”, such points with only two photo rays will also be retained, which are in at the end or in a gap of flight line photos. (Compare Standard Aerial Triangulation (SAT), Section 6.3) Default: RAYS = 2 |
11-15 |
| % |
16-20 | I5 | LIMA: Listing parameters for photo measurements. 0 :Only statistics. 1 :Listing the photo names. 2 :Listing point and photo names. 3 :Additional lists of photo measurements per point. Default: LIMA = 0 |
21-25 | I5 | MKEY: Unit of measure of photo data 1 :Millimetres 2 :Microns Default: MKEY = 1 |
26-41 | A16 | PMIN: Smallest valid point name. Points with lower names are not processed. Default: NPMIN = 1 |
42-57 | A16 | PMAX: Highest valid point name. Points with higher names are not processed. Default: NPMAX = zzzzzzzzzzzzzzz |
In case of multiple measurements of a point within a photo principally the average of the data will be built. Otherwise the influence of those measurements will be increased. However, identification of faults will be facilitated if no average will be built. If a point measurement is so un-precise, that it had been skipped, the point in this photo will not be averaged within the next computation process anyway. The erroneous measurement can then be identified in any case. This method does not work for points having been measured only in two photos, as this measurement will already have been cancelled.
The parameter PMIN has to be chosen in a way, that the photo measurements of the fiducials and eventually other auxiliary points do not take part in the adjustment.