Bug reports travel faster with your iPhone model, the iOS version, and the place on the map where you saw the problem. A screenshot is worth a paragraph.
Common questions
The map opens somewhere I have never been
That is the fallback when location permission is refused or unavailable. Turn it on in iOS Settings → Privacy & Security → Location Services → ShadeTracker, or just search for the place you want — the app works fine without the permission.
A building on the map is the wrong height, or missing
In most places heights are estimated from open map data, so a recent building can be absent and an old one can be the wrong height. Two options: draw the correct mass with the shadow calculator, or set a height of 0 over the wrong object to remove it from the calculation.
The high-resolution surface mode is not available here
That mode uses measured surface data and covers selected cities only. Where there is no coverage the app falls back to the standard model without asking; nothing is broken.
The UV number looks high while I am standing in shade
The UV index is a clear-sky value for your coordinates. It describes the sky, not your spot under the awning — the shade layer and the UV layer are deliberately kept as two separate facts.
The shadows do not match what I see outside
Check the clock and the date first: the timeline may be parked somewhere else, and one tap on Now brings it back. If the time is right, the likely cause is the building or tree model rather than the sun — tell us where, and send a photo if you can.
More general questions are answered in the FAQ on the home page, and the limits of the model are listed under accuracy.
Reporting bad data
If a building height, a tree or an address is wrong, say where — coordinates or a dropped pin are ideal. Some of it we can fix, some of it lives in third-party datasets and has to be reported upstream; either way we will tell you which.
Feature requests
Very welcome, and more useful when they come with the question you were trying to answer rather than the feature you imagined. Half of what is in the app started as somebody describing a balcony.