Schema: Possible type error in image-camera-pose.pose-utm-zone

The description and definition of image-camera-pose.pose-utm-zone suggests that the field should be a number rather then a string.

"image-camera-pose": {
                    "description": "Information required to specify camera pose. Details given in properties.",
                    "type": "object",
                    "properties": {
                        "pose-utm-zone": {
                            "description": "The UTM zone number",
                            "type": "string"
                        },...
                    }
}

assigned to @tschoening

added v2.1.0 label

@kheger

A UTM zone consists of a number and a letter, e.g. "32N". So the type should be a string, maybe the word number could be removed from the description. Interestingly, the second property of image-camera-pose is

"pose-utm-epsg": {
                   "description": "The EPSG code of the UTM zone",
                   "type": "string"
                 },

which would contain the same information or rather even more since there seem to be different UTM projections (depending on what datum they are projected on: WGS84, NAD83, ...). So maybe, to reduce confusion, "pose-utm-zone" could just be removed completely?