Level of quality for pictures

(Can't find back the previous discussions beyond the GT CNIG Cryptpad so I'm creating an issue here)

In order to offer a better re-usability for our pictures, we may characterize their level of quality. Something like a score for each picture (and sequence ?) of quality, with 5 levels (like Nutriscore) :

It could be split into sub-scores.

Positioning score

How precisely the picture is positioned :

• A : <= 1m (RTK)
• B : <= 2m (DGPS)
• C : <= 5m (hiking GPS)
• D : <= 10m (smartphone GPS)
• E : > 10m (very bad)

Image resolution score

How precise the picture is (in terms of resolution) (updated 9/10/2024) :

Score	Flat pic (70° FOV)	360 pic
A	Can't be A	>= 33MP
B	>= 33MP	>= 8MP
C	>= 8MP	< 8MP
D	>= 2MP	Can't be D
E	< 2MP	Can't be E

Any field of view between flat and 360° (partial panoramas, wide-angle flat pictures) will have a proportional resolution requirement.

Note : this score could evolve in the future to also qualify its readability (contrast, light...).

General score

General score is a mix of both positioning and resolution scores. The formula is :

round(res*2/3+gps/3)

(With A-score = 5, E-score = 1)

Examples :

Res	GPS	Overall
A	A	A
A	E	B
C	A	B
D	C	B
E	D	E