Some headings from pictures taken within the app are above 360° (iOS)

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Hi,

(iPhone 7 Plus / Input app iOS v1.02)

I had a data collection campaign running this week, and one of the enumerators used an iPhone 7 Plus. I am getting **strange values for the direction the phone is facing** when taking a picture attached to the survey form, since **several of them are above 360** (where I expect values in the 0-359 range, as described here: https://developer.apple.com/documentation/corelocation/clheading/1423568-trueheading).

I have a 'direction' field set up in QGIS as automatically updated with this formula: `read_exif(@project_home + '/pictures/height/' + "Picture_Height", 'GPSImgDirection')` (`/pictures/height/` being the subfolder where the project stores this type of pictures, and `Picture_Height` being the column where the name of the picture is stored).

What I can infer from this code https://github.com/lutraconsulting/input/blob/326a8262f410439026aea2922386f098096537de/app/ios/iosinterface.mm#L157 is that the value is taken as is from the string iOS is exposing.

Any idea on why this happens ?

Gilles

Start at app/ios/iosinterface.mm around line 157 and compare the heading value written for attached-picture EXIF with Apple’s CLHeading documentation. Reproduce or inspect the iPhone 7 Plus values alongside the QGIS direction formula; done means identifying why values exceed 360 and ensuring the stored heading follows the documented range.

Written by the indexing model from the issue text.