Constant Altitude Plan Position Indicator (CAPPI)

[meteoswiss-mdr]

It would be convenient to create a griddisplay class in line with the radardisplay class to be able to plot CAPPIs in km units.

In addition it may be convenient to be able to plot gridmapdisplay and radarmapdisplay in km units.

[jjhelmus]

@meteoswiss-mdr I agree completely with the recommendation. Thanks for submitting this. Adding labels.

[scollis]

So Just checking I understand @meteoswiss-mdr : x and y axes in km instead of lat/lon?

[meteoswiss-mdr]

Yes, that is what I meant

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[vlouf]

I recently needed to do a CAPPI, so I have coded up a notebook that do just that:
https://github.com/vlouf/radar_cappi

It wouldn't be a lot of work to add this to Py-ART, so I can do this if you want.

Strictly speaking, no interpolation is made, just looking for the nearest neighbour at each grid point for a given altitude.

[meteoswiss-mdr]

My own code for this can be found here:

https://meteoswiss-mdr.github.io/pyrad/_modules/pyrad/graph/plots_vol.html#plot_cappi

[mustafaalicelik]

I guess this feature hasn't been added to pyart yet? I need some help on this.

[zssherman]

@mustafaalicelik Seems this one went under the radar, no pun intended, I'll see if I can get the pyrad implementation provided by meteoswiss into pyart.

[mustafaalicelik]

Any improvement?

[scollis]

Can’t you just make a single level grid?

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[zssherman]

@mustafaalicelik I'm hoping to have a try at this sometime tomorrow or early next week.

[vlouf]

Hi @hamidrizvi ,

Frankly I don't remember well, it was quite some time ago.
1/ It's to convert the azimuth angle (North is 0 degree and going clockwise) to mathematical angle (0 degree is x-axis and going counter-clockwise).
2/ Altitude is in meter I believe, you should use 2000, not 2.
3/ Nearest neighbour.

[gabrielcassol]

Has this CAPPI product already been added to pyart?

[zssherman]

@gabrielcassol Hello! At the moment, it has not, still on our list for an addition before the next big release.

[syedhamidali]

@gabrielcassol I would suggest having a look at this, https://github.com/syedhamidali/CAPPI-NETCDF/blob/main/simple_cappi.ipynb

You can make the data gridded, then plot it at whatever height you want. Here I have plotted Max-CAPPI in this example.