Cell size - beam coordinates to ENU

Hi,

An Aquadopp Profiler user has the following question:

So my question is about the vertical rangebins.  We recorded data with a cellsize of 10cm in beam coordinates.  I’ve rotated the velocities to ENU coordinates and I’m just wondering about the vertical coordinate.  Is it spaced at the cellsize (ie 10cm) or do I have to correct by cos(25), so my vertical cells are actually about 9cm? 

Cheers,

Judah

Hi, the range cells are calculated so they are correct along the center line between the beams  In other words they are a litte longer along the beams by a factor of 1/cos(25).  Please remember that the notion of horizontal and vertical beam refers to a spatial average over the three (or two) beam.

Best regards, Atle Lohrmann

Thanks.  Does this also apply when we are using a HR profiler in single-beam mode, so the cells are also a little longer than set?

Cheers,

Julia

Dear Julia,  yes -- it does.

Best, Atle Lohrmann