Coordinate data returned from the live feed endpoint

[andersme]

Just curious if anyone has actually used this data to build anything. I'm having some issues with the X values and determining which end of the rink they are on and thus the distance from the goal. I know that the coordinates should generally be negative for left side and positive for right side. My issue is in trying to determine, given the period, which team should be at which end. Different rinks have different home sides so this makes this rather challenging. Any thoughts?

[Afischbacher]

Hey @andersme!

So there is the ability to see which side of the rink which team is on, take a look here when addressing which team is on which side

Nhl.Api/Nhl.Api.Domain/Models/Game/LiveGameFeed.cs

Line 390 in cb4d9b9

public string RinkSide { get; set; }

So you can then visualize the rink based on an x and y coordinate like this:

So for example, when Ovechkin scores from his "office" he is usually around the area of the top of the circle on the left side.

Here is an example of the data the live game feed would provide.

{
    "event": "Goal",
    "eventCode": "PHI59",
    "eventTypeId": "GOAL",
    "description": "Alex Ovechkin (23) Slap Shot, assists: John Carlson (29), Evgeny Kuznetsov (15)",
    "secondaryType": "Slap Shot",
    "strength": {
        "code": "PPG",
        "name": "Power Play"
    },
    "gameWinningGoal": false,
    "emptyNet": false,
    "about": {
        "eventIdx": 18,
        "eventId": 59,
        "period": 1,
        "periodType": "REGULAR",
        "ordinalNum": "1st",
        "periodTime": "03:38",
        "periodTimeRemaining": "16:22",
        "dateTime": "2021-04-17T16:43:36Z",
        "goals": {
            "away": 1,
            "home": 0
        }
    },
    "coordinates": {
        "x": 51.0,
        "y": 22.0
    }
}

So his X coordinate is 51 and his Y coordinate is 22 on the ice.

Here is a video to add the visual representation of where he is on the ice when he scored https://www.nhl.com/islanders/video/ovechkin-scores-from-his-office/t-277521762/c-8097097

So if we were to put this on the map he would be roughly here

Hope this helps!

[andersme]

I see the property RinkSide in LiveGameFeedTeam, but I can't seem to find where that is used or how to access it. The classes that inherit from this base aren't used anywhere. Am I missing something?

[andersme]

One thing to note, is that it appears that not all games have the rinkside property. Perhaps some games just didn't have it recorded. Maybe there's some other way to tell orientation other than using the linescore.

[andersme]

Here's the full list from 2010 to present:

incorrectgames.csv

[Afischbacher]

Hey @andersme,

I am just writing unit tests around all of these cases, I am deciding whether I should preserve the original data from the NHL API or overwrite it, any thoughts here? I currently have an additional property, CorrectedRinkSide but there are cases where my logic won't be able to adjust for it, there are some games that have no play by play data, which omit's the ability for me to determine the coordinates of a play and determine which side which team in the rink they should be on. It covers 90%+ of the cases thus far, I will use your updated dataset to add to all of the test cases I currently have.

Thanks for the data and all your help, I will try and push out 1.7.0 this week with this fix.

Best Regards and hope this helps!

[andersme]

I currently have a work around in my code, and it's a bit of a hack. I simply look at the play-by-play events of each period and decide if they are mostly positive or negative X values for the home team. I then base my orientation on that. The seperate property for CorrectedRinkSide would be awesome! Thanks for all your help with this.

[Afischbacher]

I am basically doing the same, using a shot event and based on the home and away team and the x coordinate making the judgment on whether it's a home or away team and which side it should be on. I am using all the games you provided me as test cases, I will make a pull request and post it here to make sure my logic is not incorrect, but the unit tests should help cover and validate this for me.

Thanks again!