Coral Cover: Tonga 2013

Shaded value = in the CV mean (shade deepens with cover) Gray italic = shown for comparison but left out of the CV mean: the gold standard (the reference value) and the manually annotated in CoralNet CoralNet benchmark annotations (reference values, not models), Coralscapes (not trusted), and any value that reuses the reference's own data n = frames behind the value — = not run or not applicable (see each region's notes) Site names and method names link out (new tab)

Coral Cover: Tonga 2013

22 sites · 422 photos

Gold standard = LOF diver transects (no photos); the value is the mean of all of each site's transects. Claude is a comparison only, at sites with at least 10 usable habitat photos.

Site	Date	Headline (site page)	Claude	Gold standard	CoralSCOP
TOHA03	2013-09-12	20%transect	20^a,e,fn=16	20^a,b	32^a,c,dn=16
TOHA04	2013-09-12	25%transect	18^a,e,fn=14	25^a,b	26^a,c,dn=14
TOHA08	2013-09-13–14	22%transect	34^a,en=26	22^a,b	28^a,c,dn=26
TOHA10	2013-09-14	40%transect	29^a,en=23	40^a,b	25^a,c,dn=23
TOHA14	2013-09-16	44%transect	36^a,en=38	44^a,b	33^a,c,dn=38
TOHA18	2013-09-17	53%transect	48^a,e,fn=16	53^a,b	29^a,c,dn=16
TOHA21	2013-09-18	35%transect	32^a,e,fn=12	35^a,b	38^a,c,dn=12
TOHA22	2013-09-18	40%transect	12^a,en=21	40^a,b	21^a,c,dn=21
TOHA27	2013-09-20	31%transect	25^a,e,fn=13	31^a,b	39^a,c,dn=13
TOHA28	2013-09-20	31%transect	46^a,e,fn=17	31^a,b	32^a,c,dn=17
TOHA29	2013-09-20	42%transect	45^a,e,fn=13	42^a,b	41^a,c,dn=13
TOHA30	2013-09-21	40%transect	36^a,e,fn=10	40^a,b	36^a,c,dn=10
TOHA31	2013-09-21	34%transect	37^a,e,fn=18	34^a,b	39^a,c,dn=18
TOHA32	2013-09-21	34%transect	44^a,e,fn=11	34^a,b	27^a,c,dn=11
TOVA33	2013-09-22	33%transect	33^a,en=21	33^a,b	36^a,c,dn=21
TOVA37	2013-09-23	28%transect	12^a,e,fn=18	28^a,b	25^a,c,dn=18
TOVA38	2013-09-24	41%transect	30^a,en=41	41^a,b	31^a,c,dn=41
TOVA44	2013-09-25	53%transect	32^a,e,fn=15	53^a,b	40^a,c,dn=15
TOVA52	2013-09-28	47%transect	43^a,e,fn=17	47^a,b	43^a,c,dn=17
TOVA53	2013-09-28	38%transect	40^a,en=34	38^a,b	39^a,c,dn=34
TONI54	2013-09-29	34%transect	20^a,e,fn=13	34^a,b	34^a,c,dn=13
TONI55	2013-09-29	33%transect	35^a,e,fn=15	33^a,b	34^a,c,dn=15
All sites (unweighted mean)		—	32	36	33

Notes for Tonga 2013 (10)

[a] Value from the map's computer-vision method tables (denominator and photo set as on the site's page).
[b] Gold = Living Oceans Foundation (LOF) Global Reef Expedition in-water diver transect, the mean of all of the site's transects. It is the primary value; the photo cell is a comparison only.
[c] CoralSCOP = per-frame sum of colony-mask area fractions (zero-filled; overlapping masks double-count), averaged over frames with an ok row. Area index, not a point count: denominator differs from any point-count reference. It is also unstable frame to frame (the same subject has scored 94.1% in one photo and 23.3% in another), and the mask sum overstates cover most on the healthiest reefs.
[d] CoralSCOP here = the site page's frame-matched row: run on exactly the photos behind the Claude cell (per-frame values joined by file; capped at 100% per photo; zero-filled). Comparison only.
[e] Claude = blind 7-call point count on the author's EDITED September 2013 survey-dive photos, 20 points per photo, (HC+BL)/(20 − WATER − FISH − OBST), unknown points kept in the denominator; mean across photos. Comparison only: never averaged with the transect and never the headline; site means only (photos are not the transect points).
[f] LOW-N: 10–19 usable habitat photos at this site; indicative only, not a confident estimate.
Mean/Range: Mean ± SD and Range are over the CV cells that enter the mean (CoralNet where independent, DINOv3, CoralSCOP unedited/edited, Claude). Gold standard, frames manually annotated in CoralNet, Coralscapes and same-measurement cells are shown in gray italic but never averaged.
Headline (site page): the coral-cover figure the site's page, report card and map pop-up print, with its method; it is never averaged into the CV mean.
Methods: Claude (Anthropic); DINOv3 (Meta; paper; used here as the frozen backbone of the in-house classifier); Coralscapes v1 and v2 (EPFL-ECEO; dataset paper, code); CoralSCOP (Zheng et al., CVPR 2024); CoralNet.
Sites: names drop the region prefix (hover for the full name) and link to the site's CRD page, or to the regional summary page where the site has none. Date = survey date from the map pins (first–last visit); sites are listed earliest first, undated sites last.

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