Weather radar layer shows ghosts
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See screenshots:
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@hangInThere Hello, your post is unclear, please provide more details.
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@hangInThere
“You will see what I saw”
I don’t know what you saw as you provide no explanation.
Is it just just a game ? -
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@hangInThere this is where radars from Malaysia, Singapore and Indonesia overlap. One of them might have an outage and older frame might have been used in the radar composite, thus old and new frame were merged together making the ghost appear. Our logs show that frames from Malaysian radar were delayed (from 2023-07-28 03:30 to 04:10 and then again at 04:45 and 05:30, all times UTC) which might have caused the trouble.
Also, using UTC times would greatly help me with locating the issue (:
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@Filip_K I will remember to note down the UTC time (the local time is displayed on the time slider at the bottom of the weather radar images. Malaysia is GMT+8).
Do you receive weather radar images directly from Met Malaysia, or elsewhere? I noticed this morning btwn 9:30AM and 11:30AM (0130 to 0330 UTC) they had outage again on their own weather radar webpage. Seems to happen quite often. I have notified them of this outage. -
@hangInThere Yes, we use images MET Malaysia publishes on their web for public. There is no other source. I tried contacting them and they replied that the web is the only source they provide. So if the web has outage (unreachable, old data, ...) we have same outage
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@Filip_K Ah so I thought. To guard against stale old data, I suggest you implement a hash to compare newly downloaded PNG file with the previous download.
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@hangInThere guarding against old data is not a problem (and is already implemented) but when only old images are available, we cannot get new ones
