Add NEXRAD COPY example

[rafatower]

This is an example about how to use the CopySQLClient to stream data from an external service, in this case NEXRAD Level 2 radar data, to a CARTO table.

I created it in a separate directory, in order not to pollute the dependencies of the other examples, cause it requires numpy and siphon (which in turns requires pandas) and those packages need native dependencies that might be tricky to get installed.

[rafatower]

Could you please take a final look?

PS: sorry, I forgot to push a commit :S

[rafatower]

da visual test:

INFO:nexrad_copy:Avaliable datasets: ['Level2_KLVX_20180822_1657.ar2v']
INFO:nexrad_copy:Using the first one
INFO:nexrad_copy:Got the following data: Nexrad Level 2 Station KLVX from 2018-08-22T16:57:27Z to 2018-08-22T17:01:59Z
INFO:nexrad_copy:Weather Surveillance Radar-1988 Doppler (WSR-88D) Level II data are the three meteorological base data quantities: reflectivity, mean radial velocity, and spectrum width.

vs

https://radar.weather.gov/radar.php?rid=lvx

[alrocar]

I randomly found this on Tw

Could it be a good occasion to showcase this example in a blog post?

CCing @makella

[makella]

YES! i can help with some of the cartography/styling if you guys want!!

[rafatower]

:open_mouth: yes, please, of course!

Actually I'm writing a post about the python SDK and the copy right now and a couple assets will be more than welcomed. Kind of in a rush, cause tomorrow I'll be :beach_umbrella:

Edit: probably talking about different posts

[makella]

@rafatower is there some data you can pass me? i'll see if i can do something quickly :)

[makella]

Edit: probably talking about different posts

Ah! missed this! ok, let me know i would love to work on symbolizing some of the radar data!!!