Order of radar rays in a sweep

FM301 Data Standard
1

Do you know if FM301 requires a specific order of radar rays in a sweep, e.g. based on time or angle? I could find any information on this in the documentation.

2

Dear Gunther @guntherhaase, welcome on board openradar discourse!

As I read the documentation, it depends on how the volume is aquired:

301.4.2    Sweep groups shall be named sweep_, where  is the sweep
           number starting at 0 for the first sweep acquired during the volume
           and increasing sequentially in acquisition order.

Taken from here:

https://library.wmo.int/idurl/4/35625

Hope this sheds some light.

Best,
Kai

3

Hi again,

I see, that doesn’t really answer the question. But as time is the major dimension, I’d assume that rays are in order of acquisition, like in CfRadial1.

Update: There is a global attribute “Ray_times_increase” which can be set true or false. So it seems possible to have an arbitrary ray layout. Unfortunately the documentation isn’t very chatty about that feature.

Best,
Kai

4

Thank you, @kmuehlbauer!

Yes, that makes sense. But I’m not sure if this is intentional.

Best,
GĂĽnther

5

Hi guys,

Let me look into this. Ray_times_increase=False seems counter-intuitive to me, but I’ll get clarity.

best, daniel

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