Radar Data Issue in Areas of Overlap with Adjacent Provider

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    Hello,

    There seems to be an issue in areas of weather radar overlap between adjacent weather data providers (let's say providers A and B) that causes the part of A's radar image that overlaps with B to disappear when A's data expires and becomes hatched elsewhere.

    Please see this video for an example. Running horizontally across the middle of this video is the 49th parallel, the border between Canada and the US. Data north of the border is provided by Environment Canada, and south of the border by NOAA. Here in Vancouver, we are close enough to the border that we are covered by both weather radar feeds. Watch the time slider along the bottom of the screen. You'll notice that in the most current image (end of slider), the Environment Canada data becomes hatched (expired, in relation to the NOAA data, I presume), and at the same time a large portion of the radar image around Vancouver disappears. This is the Environment Canada data that's disappeared, even though it remains hatched in the rest of the visible area. It should, therefore, appear hatched here too.

    I believe that there is some kind of graphical issue that prevents the hatched weather data from displaying correctly in areas where there is an overlap with an adjacent provider.

    Please let me know if you require any further info!

    Cheers,

    Chris
    Vancouver, BC

  • Administrator

    @inajet Hello, unfortunately I cannot access the video. Did you enclose a correct link?

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    @korina my apologies, I linked the wrong file. It should be working now.

  • Administrator

    @inajet Hello, if you mean the "striped" radar in the north, it is caused by temporary radar disturbance on the provider side. As you can see now, everything is in order.

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    @korina I know what the stripped/hatched area means. Please read my post in detail. It explains the issue I am referring to.

  • Administrator

    @inajet Hello, this is actually correct behaviour of radar. Radars do overlap each other, map shows the maximum value of precipitation.

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    @korina this is exactly the problem - in my example it is not behaving the way you describe it should be. In the regions I highlighted, the Environment Canada data disappears in the latest time stamp (when the rest of the visible Environment Canada data become hatched). If it were in fact showing the maximum value of precipitation, this data would remain.

    The issue is clear when you see the difference between the two images, or between the two time stamps in the video. A large portion of the Environment Canada data in the highlighted region simply disappears when the rest of the data becomes hatched. This clearly seems to be a bug related to when one part of the overlap area becomes hatched/striped. Before this data becomes hatched/striped, everything is behaving as it should.

    I have emailed you an additional example. Thanks for continuing to look into this issue.

  • Administrator

    @inajet Hello, I have discussed this issue with our team.
    I understand this may seem as bug, but this behaviour is intentional. Radar sources overlap each other and it may cause other source to disappear or be hatched.

    We may change the approach to this in the future. but as for now, this is correct behaviour.

  • | Premium

    Hi @korina,

    Thanks for continuing to look into this issue.

    If this is in fact the correct behaviour, why is it that the data from both overlapping sources is in fact displayed correctly in the overlapping region in the first frame? It is only in the second frame, when the Environment Canada data in the non-overlapping regions becomes hatched, that the EC data in the overlapping region disappears.

    It is this inconsistency in the behaviour of the overlapping data that was leading me to believe that this issue is bug and not the intended behaviour.

    Cheers,

    Chris

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