Quality of SUA file for WGC Uvalde

I do use a sphere. I have code that does it using an ellipsoid, but I found that the match to other FAA sources (such as visual charts and licensed digital data) is not as good. I think the FAA may use a spherical model when producing their own digital representations.

No digital source exists that perfectly matches the FAA orders. For example, the licensed data (such as is available from for-charge services) for MOAs often shows significant differences from the FAA orders. So you're correct that the only way to get a match would be to code it by hand. The orders themselves are not perfectly internally consistent either. One near me specifies radii in both nautical and statue miles, using a conversion factor of 1.1.

L.

Thanks for the explanation.

In the data you use to derive the radii and vertices of the arcs, are the arcs approximated by a polygon with significantly more than 2 vertices? If so it might be much better to keep the original polygon approximating the arc, as the the result of air space checks would be nearly independent from the used Earth model, provided that the length of geodesic between the vertices of the polygon is not significantly larger than 12nm.

There are only 45 DB records in the Uvalde airspace file. I think that before the WGC starts it is worthwhile to enter these radii and vertices by hand, so that we can be sure that all competitors and also navigation software and scoring programs will interpret the open-air-format information consistently.

I know we have the 30 day rule, but the current state of inconsistency is not something one would expect for a file used at a WGC.

It appears to me that the scoring files (the ones marked for weekend and weekday use) have already been hand-edited. As I understand it, the file with Corpus Christi in it is informational, not for scoring.

But again, just to be clear... please understand that I'm not affiliated with the contest in any way. The organizers just used my work to build the airspace files. It might be best to send feedback directly to them, rather than in this forum.

Lynn