Scale on speed map changes with degree of Zoom

[isomemo]

Scale on speed map changes with degree of Zoom. This is an old previously reported bug. Perhaps a fix is readily available?

I used this dataset:
rice spread.xlsx

These settings were used: Date type interval (Start.Date... and Finish.Date... as field inputs), Longitude & Latitude as coordinate fields, Min estimate, 0.05% quantile, uniform full width distribution, and remaining default options.

See this video for illustration: https://youtu.be/qDOJMUOOFLQ

[mgross]

On the speed, we use a different method compared to the paper. I give an example how the high speeds occur (and how the "bug" occurs):

We have an observation in western Borneo and in southern Sulawesi where we have similar estimated minima times. Between them there are no observations. Now, speed is: (distance) / (time estimate difference). If both time estimates are very similar and thus the time estimate difference between both locations, the model assumes that rice spread very fast between these points. To me this seems the right answer and I am not sure what to improve here. (if the denominator gets small, the overall estimate gets large).This also has to do with lack of data in these regions, which make the speed estimate quite uncertain. If you zoom in you get more points estimated per sq-km and that causes the bug as small denominator changes can cause large differences in the estimates.

[isomemo]

Ok! I also got different estimates by moving the graph (no zoom). Thus, the scale reflects the range for the visible area? If so, can this also change for the average map?

[arunge]

@isomemo Here, the same as for #27 (comment).
I mentioned this bug in the new task list and I shift it to the next project:

[isomemo]

Ok!

[arunge]

@isomemo I checked the video and the answer of @mgross seems to solve the issue.

Is there any interface issue to be fixed here? Or is there only the open question to @mgross left here?