Drift Correction with "No Data Values"

[AmberSJones]

A user has reported an issue when trying to perform drift correction over a period when no data values are included. They report that the no data values are shifted with the drift correction- even when the no data values were not selected by the lasso or the filter. The expected behavior is that the no data values should not shift in value (i.e., they should remain -9999), however, the drift correction must account for the spacing of those data values in making the adjustment of all past points.

@PhilSuiter will you please test this issue? When you perform a drift correction that includes sections of -9999 values, what happens to the -9999 values? Try two cases: 1. those values are selected with the rest of the data and 2. those values are not selected for performing the drift correction.

[sreeder]

@AmberSJones ready for testing on lineardrift branch

[AmberSJones]

So, this is working well when the -9999 values are selected with surrounding data points. However, when the lasso is used to select a group of points that encompass some -9999 points (but the -9999 are not selected), the drift correction is not performed at all- no shift is made.

[sreeder]

I believe this is happening because it has technically become 2 separate selections, and we only allow a user to do a drift correction when they have a single grouping of points selected. so we need to add some sort of message to indicate this is happening.

[AmberSJones]

We determined that we need a message to clarify this behavior. Let me know if/when that is ready.

[sreeder]

@AmberSJones Message has been added

[AmberSJones]

Looks good.