HDX ADSB weather DBz scale

[Flying_Monkey]

I looked in the manual but couldn't find the answer. Does anyone have the DBz scale for weather depiction via ADSB on the HDX?

Thanks!

Eric

 

[Flying_Monkey]

Does anyone know what green, yellow, red etc dBZ levels are?? No one?

 

[lancair360]

Red is bad. Yellow is not great. Green is a bug wash.

 

[Flying_Monkey]

Red is bad. Yellow is not great. Green is a bug wash.

It seems like the scale on the HDX is very different than other ADSB sources like my Avidyne IFD540 and Foreflight (which does publish a scale). The HDX seems to indicate yellow and red while the others show just green and yellow. I just want to know the scale so I can make decisions based on actual real data. Hey Dynon, what's the scale?

 

[lancair360]

In a Cherokee with your family how close you wanna cut it? How bad you gotta get there?

 

[RV8JD]

Not in dBZ, but some info from page 5-77 of the SkyView HDX Pilot’s User Guide – Revision F. (I got a chuckle from the use of "Heavier" and "More Extreme" ... looks like they ran out of superlatives!)

ForeFlight's WX legends (you need to take along a cheat sheet to interpret the colors/shading):

http://cloudfront.foreflight.com/docs/ff/13.2/v13.2 - foreflight weather legends optimized.pdf

 

[Rhino]

Look at the bottom right of the radar image below;

 

[swatson999]

How is that helpful? It's a different scale entirely, with different colors and much finer gradations.

 

[Rhino]

It's the scale for NEXRAD, which if I'm not mistaken is what's distributed via ADS-B, which is in turn is what was asked for. Feel free to offer corrections if I'm mistaken. It would be more helpful than simple criticism. I've never claimed to be all-knowing and all-seeing.

 

[swatson999]

It's the scale for NEXRAD, which if I'm not mistaken is what's distributed via ADS-B, which is in turn is what was asked for. Feel free to offer corrections if I'm mistaken. It would be more helpful than simple criticism. I've never claimed to be all-knowing and all-seeing.

No, the OP asked for "Does anyone have the DBz scale for weather depiction via ADSB on the HDX?". Clearly, the scale and color chart that Dynon uses for its depiction bears little, if any, relation to the Nexrad data that is provided on other platforms.


Dynon's:

Nexrad:

No Data is different, black doesn't appear at all on Nexrad, brown and blue don't appear at all on Dynon, the sequence of light and dark green is reversed one to the other, there's no white on Dynon, and whereas Nexrad has 23 levels, Dynon has 8.

 

[Rhino]

So the HDX doesn't simply display the radar images, but rather natively renders the images from scratch using raw data. That's good to know. Thanks.

 

[Flying_Monkey]

I had seen the scale in the Dynon manual of course. I just want to know what the actual DBZ numbers are, because the colors look different than my other weather sources. How can we make decisions on distance to keep from weather with general adjectives only? The Foreflight scale is very useful. Dynon, can you please publish a similar scale with actual DBZ numbers? Obviously someone has made a conscious decision of which colors to show based on which values in the ADSB data- please share!

 

[Rhino]

Absent an answer from Dynon on the exact numbers, this reference seems helpful. See pages 30-34;

http://www.flying20club.org/documents/Effectively_Using_ADS-B.pdf

 

[Rhino]

I may have found the answer. Check page 35;

https://www.faa.gov/nextgen/programs/adsb/archival/media/gdl90_public_icd_reva.pdf

 

[Flying_Monkey]

I may have found the answer. Check page 35;

https://www.faa.gov/nextgen/programs/adsb/archival/media/gdl90_public_icd_reva.pdf

If we correlate that legend to Dynon's color key we would have this:

Can someone at Dynon confirm this is accurate?

 

[ddelong]

Flying Monkey has it correct. ADS-B only encodes it with 8 levels and they are as described in Flying Monkey's post.