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jekhokie / raspberry-noaa-v2

V2 of the fantastic Raspberry Pi NOAA setup
GNU General Public License v3.0
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Map overlay problem #910

Open yvesclousier opened 7 months ago

yvesclousier commented 7 months ago

Hello everyone. Great job with this app. Since the last version I noticed that the base map does not correspond perfectly with the images received. do you have an idea ? See the images here:

http://15.188.192.50/captures?page_no=1

Looking online, I realized that I wasn't the only one with the same problem. thanking you in advance for your return.

Sasszem commented 6 months ago

Sadly I could not open the link. Is the problem a small offset between the overlaid map and the actuall terrain?

See this picture: METEOR-M2-3-20240223-091331-spread_221 (The offset is quite noticable at the island above Berlin)

yvesclousier commented 6 months ago

Hi, Sorry for the link, you can check here https://clousier.com/captures/listImages?pass_id=424 All Noaa captures processed by WxtoImg seem to have this offset. On the other hand, the reception of Meteor with processing by Satdump does not show this offset. The server is synchronized well on an NTP server. Capture1

Sasszem commented 6 months ago

In our case, the problem seems to only happen with Meteor, not with NOAA. Even there, it's inconsistent - we just switched on Meteor on friday, but the images on sunday are lined up correctly.

EDIT: Seems like the false-colored images somehow hide this fact - I see many misaligned landmasses on images with Enhancement: ZA or Enhancement: HVCT. Don's look at Enhancement: MCIR - it hides the problems!

I'm not sure but it seems like our offset problem with Meteor just vanished.

It also seems like both of our ground stations have a similar offset. I wonder if that's just a coincidence, or something else.

I noticed that you also mentioned using RTL-TCP for reception, I wonder if that makes any difference - it should not imho.

MihajloPi commented 5 months ago

Thanks for reporting the issue! This should have been solved by now so please try updating your OS and the RN2 and run the install script again. In settings.yml file now there is a variable to tune map offsets for NOAA which only happen when decoding with WXtoImg and never with SatDump. The reason it doesn't happen with Meteor is, the satellite transmits its on-board time along with the image. NOAA doesn't so it can suffer from clock on the Pi being inaccurate by a few seconds.

athisha1 commented 4 weeks ago

Hello everyone. Great job with this app. Since the last version I noticed that the base map does not correspond perfectly with the images received. do you have an idea ? See the images here:

http://15.188.192.50/captures?page_no=1

Looking online, I realized that I wasn't the only one with the same problem. thanking you in advance for your return.