Exception in Tkinter callback (ValueError: zero-size array to reduction ...)

[forkozi]

from email from Jaime Kum...

Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python27\lib\lib-tk\Tkinter.py", line 1541, in call
return self.func(*args)
File "Gui.py", line 416, in tpuProcessCallback
self.sbets_df, las_to_process)
File "D:\00408518_data\NGS_TPU-master\calc_aerial_TPU.py", line 381, in main
D = merge(sbets_df.values, t, x, y, z) # D for data
File "D:\00408518_data\NGS_TPU-master\calc_aerial_TPU.py", line 59, in merge
max_dt = np.max(dt)
File "C:\Python27\lib\site-packages\numpy\core\fromnumeric.py", line 2320, in amax
out=out, **kwargs)
File "C:\Python27\lib\site-packages\numpy\core_methods.py", line 26, in _amax
return umr_maximum(a, axis, None, out, keepdims)
ValueError: zero-size array to reduction operation maximum which has no identity

[forkozi]

I was able to reproduce this error.

LAS file File Name 2016_568500e_2780000n_SORTED_0000000.las has one point in it. The point has a suspicious GPS Time of 1000000000.000 (Standard Time). I'm thinking this is a flier that didn't match up with a time stamp in what was supposed to be the corresponding sbet file, which resulted in an empty array, which threw the ValueError: zero-size array exception at line 59.

There is currently a check to see if the las files contain > 0 points, but not if the merged data have > 0 points. I will add another comment when I update the code.