Threshold module in monteverdi does not allow to choose negative value for threshold
Mantis Issue 166, reported by echristophe, assigned to abricier, created: 2010-05-25
Threshold module in monteverdi does not allow to choose negative value for threshold. This make it impossible to threshold properly some images obtained from the vegetation indices (that may have negative values).
It is just an interface issue.
1274944631 - grizonnetmsince 1.0.1, the step of threshold is dynamically set, depending on the image dynamic. It has to be the same for the lower and upper values of the threshold.
1274945540 - christopThat was tested with the current development version of Monteverdi.
1275640255 - aurelienBoth upper and lower thresholds can be set to negative values in compliance with the image dynamic. The process correctly threshold negative values. In fact, it's the upper and lower threshold value display boxes that cannot display both the minus sign and a value with more than three digits.
1276098459 - aurelienFor now on, the threshold module interface can display up to ten digits and the minus sign in both upper and lower threshold value boxes.
1278665831 - christopApparently, the minimum and maximum are not the true minimum and maximum of the image: are they computed on the quicklook or are they the 2% min/max.
The consequece is that it is not possible to do a real binary threshold (some values