Coral Cover: Chagos #1 2015

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: Chagos #1 2015

55 sites · 1,281 photos

Gold standard = LOF diver transects (no photos). 120 photos manually scored (via CoralNet).

Site	Date	Headline (site page)	Claude	Gold standard	Manually annotated in CoralNet	CoralNet	DINOv3	Coralscapes v1	Coralscapes v2	CoralSCOP	Mean ± SD of CV	Range
BICA01	2015-03-09	4.6%transect	too few photos (n=1)^a,g,h	4.6^a,b	too few photos (n=1)^a,i,h	—	too few photos (n=1)^a,d,h	too few photos (n=1)^a,e,h	too few photos (n=1)^a,e,h	too few photos (n=1)^a,f,h	—	—
BIEG02	2015-03-10	37%transect	18^a,gn=21	37^a,b	25^a,in=21	—	24^a,dn=21	31^a,en=21	35^a,en=21	24^a,fn=21	22 ± 3.2	18–24
BIEG03	2015-03-10	40%transect	17^a,gn=36	40^a,b	24^a,in=36	—	18^a,dn=36	32^a,en=36	34^a,en=36	26^a,fn=36	20 ± 4.8	17–26
BIEG04	2015-03-10	33%transect	26^a,gn=19	33^a,b	34^a,in=19	—	35^a,dn=19	36^a,en=19	39^a,en=19	28^a,fn=19	30 ± 4.8	26–35
BIEG05	2015-03-11	44%transect	39^a,gn=59	44^a,b	41^a,in=35	58^a,cn=24	40^a,dn=59	61^a,en=59	64^a,en=59	41^a,fn=59	45 ± 8.8	39–58
BIEG06	2015-03-11	49%transect	32^a,gn=30	49^a,b	—	44^a,cn=30	34^a,dn=30	46^a,en=30	46^a,en=30	23^a,fn=30	33 ± 8.9	23–44
BIEG07	2015-03-11	48%transect	too few photos (n=8)^a,g,h	48^a,b	too few photos (n=8)^a,i,h	—	too few photos (n=8)^a,d,h	too few photos (n=8)^a,e,h	too few photos (n=8)^a,e,h	too few photos (n=8)^a,f,h	—	—
BIDI08	2015-03-12	61%transect	35^a,gn=35	61^a,b	—	36^a,cn=35	29^a,dn=35	50^a,en=35	53^a,en=35	39^a,fn=35	35 ± 4.2	29–39
BIDI09	2015-03-12	38%transect	34^a,gn=30	38^a,b	—	38^a,cn=30	24^a,dn=30	56^a,en=30	61^a,en=30	32^a,fn=30	32 ± 6.0	24–38
BIDI10	2015-03-12	23%transect	23^a,gn=13	23^a,b	—	27^a,cn=13	16^a,dn=13	44^a,en=13	49^a,en=13	33^a,fn=13	25 ± 7.1	16–33
BIDI12	2015-03-13	4.2%transect	2.9^a,gn=14	4.2^a,b	—	10^a,cn=14	11^a,dn=14	8.2^a,en=14	10^a,en=14	18^a,fn=14	11 ± 6.1	2.9–18
BIDI13	2015-03-13	7.2%transect	18^a,gn=11	7.2^a,b	—	20^a,cn=11	18^a,dn=11	22^a,en=11	24^a,en=11	25^a,fn=11	20 ± 3.3	18–25
BIDI14	2015-03-13	17%transect	too few photos (n=9)^a,g,h	17^a,b	—	too few photos (n=9)^a,c,h	too few photos (n=9)^a,d,h	too few photos (n=9)^a,e,h	too few photos (n=9)^a,e,h	too few photos (n=9)^a,f,h	—	—
BIDI15	2015-03-14	20%transect	too few photos (n=9)^a,g,h	20^a,b	—	too few photos (n=9)^a,c,h	too few photos (n=9)^a,d,h	too few photos (n=9)^a,e,h	too few photos (n=9)^a,e,h	too few photos (n=9)^a,f,h	—	—
BIDI16	2015-03-14	27%transect	24^a,gn=13	27^a,b	—	26^a,cn=13	22^a,dn=13	32^a,en=13	36^a,en=13	31^a,fn=13	26 ± 3.7	22–31
BIDI16.5	2015-03-14	46%*manual	26^a,gn=11	46^a,jn=13	—	39^a,cn=11	42^a,dn=11	37^a,en=11	39^a,en=11	30^a,fn=11	34 ± 7.3	26–42
BIEA18	2015-03-15	21%transect	18^a,gn=35	21^a,b	—	22^a,cn=35	15^a,dn=35	33^a,en=35	32^a,en=34	28^a,fn=35	21 ± 5.9	15–28
BIEA19	2015-03-15	28%transect	31^a,gn=14	28^a,b	—	27^a,cn=14	25^a,dn=14	42^a,en=14	45^a,en=14	39^a,fn=14	31 ± 6.1	25–39
BIEA20	2015-03-15	13%transect	22^a,gn=19	13^a,b	—	25^a,cn=19	16^a,dn=19	31^a,en=19	35^a,en=19	27^a,fn=19	22 ± 4.8	16–27
BIEA22	2015-03-16	27%transect	31^a,gn=23	27^a,b	—	49^a,cn=23	45^a,dn=23	44^a,en=23	46^a,en=23	50^a,fn=23	44 ± 8.9	31–50
BIEA23	2015-03-16	26%transect	29^a,gn=24	26^a,b	—	36^a,cn=24	29^a,dn=24	44^a,en=24	49^a,en=24	40^a,fn=24	33 ± 5.4	29–40
BIEA24	2015-03-16	16%transect	37^a,gn=11	16^a,b	—	41^a,cn=11	41^a,dn=11	49^a,en=11	49^a,en=11	39^a,fn=11	40 ± 1.7	37–41
BIEA24.5	2015-03-16	—	too few photos (n=5)^a,g,h	—^k	—	too few photos (n=5)^a,c,h	too few photos (n=5)^a,d,h	too few photos (n=5)^a,e,h	too few photos (n=5)^a,e,h	too few photos (n=5)^a,f,h	—	—
BIEA25	2015-03-17	18%transect	16^a,gn=19	18^a,b	—	29^a,cn=19	26^a,dn=19	31^a,en=19	33^a,en=19	30^a,fn=19	25 ± 6.2	16–30
BIEA26	2015-03-17	24%transect	15^a,gn=30	24^a,b	—	21^a,cn=30	14^a,dn=30	23^a,en=30	28^a,en=30	27^a,fn=30	19 ± 6.2	14–27
BITB27	2015-03-17	36%transect	24^a,gn=16	36^a,b	—	34^a,cn=16	24^a,dn=16	46^a,en=16	48^a,en=16	38^a,fn=16	30 ± 7.0	24–38
BITB28	2015-03-18	31%transect	18^a,gn=43	31^a,b	—	27^a,cn=43	20^a,dn=43	34^a,en=43	37^a,en=43	29^a,fn=43	24 ± 5.1	18–29
BITB29	2015-03-18	30%transect	19^a,gn=49	30^a,b	—	30^a,cn=49	24^a,dn=49	40^a,en=49	42^a,en=49	26^a,fn=49	24 ± 4.6	19–30
BITB30	2015-03-18	43%transect	14^a,gn=12	43^a,b	—	30^a,cn=12	18^a,dn=12	34^a,en=12	38^a,en=12	30^a,fn=12	23 ± 8.2	14–30
BITB32	2015-03-19	30%transect	12^a,gn=19	30^a,b	—	17^a,cn=19	12^a,dn=19	18^a,en=19	20^a,en=19	20^a,fn=19	15 ± 4.0	12–20
BITB33	2015-03-19	21%transect	7.9^a,gn=27	21^a,b	—	20^a,cn=27	11^a,dn=27	18^a,en=26	18^a,en=26	22^a,fn=27	15 ± 6.9	7.9–22
BITB34	2015-03-19	62%transect	37^a,gn=11	62^a,b	—	41^a,cn=11	35^a,dn=11	56^a,en=11	67^a,en=10	47^a,fn=11	40 ± 5.3	35–47
BITB34.5	2015-03-19	—	too few photos (n=3)^a,g,h	—^k	—	too few photos (n=3)^a,c,h	too few photos (n=3)^a,d,h	too few photos (n=3)^a,e,h	too few photos (n=3)^a,e,h	too few photos (n=3)^a,f,h	—	—
BICC35	2015-03-20	14%transect	6.7^a,gn=15	14^a,b	—	17^a,cn=15	13^a,dn=15	21^a,en=15	24^a,en=15	20^a,fn=15	14 ± 5.9	6.7–20
BICC36	2015-03-20	8.6%transect	6.4^a,gn=15	8.6^a,b	—	19^a,cn=15	18^a,dn=15	21^a,en=15	27^a,en=15	25^a,fn=15	17 ± 7.7	6.4–25
BITB37	2015-03-20	40%transect	29^a,gn=56	40^a,b	—	37^a,cn=56	30^a,dn=57	51^a,en=55	54^a,en=55	42^a,fn=57	35 ± 6.4	29–42
BITB38	2015-03-21	58%transect	26^a,gn=44	58^a,b	—	34^a,cn=44	28^a,dn=44	54^a,en=44	56^a,en=44	31^a,fn=44	30 ± 3.3	26–34
BITB39	2015-03-21	52%transect	37^a,gn=60	52^a,b	—	40^a,cn=60	32^a,dn=61	53^a,en=59	57^a,en=59	44^a,fn=61	38 ± 5.4	32–44
BITB40	2015-03-21	45%transect	too few photos (n=5)^a,g,h	45^a,b	—	too few photos (n=5)^a,c,h	too few photos (n=5)^a,d,h	too few photos (n=5)^a,e,h	too few photos (n=5)^a,e,h	too few photos (n=5)^a,f,h	—	—
BITB41	2015-03-22	43%transect	25^a,gn=13	43^a,b	—	32^a,cn=13	32^a,dn=13	40^a,en=13	42^a,en=13	40^a,fn=13	32 ± 6.0	25–40
BITB42	2015-03-22	40%transect	23^a,gn=49	40^a,b	—	31^a,cn=49	24^a,dn=51	40^a,en=50	43^a,en=51	35^a,fn=51	28 ± 5.9	23–35
BITB43	2015-03-22	30%transect	22^a,gn=12	30^a,b	—	36^a,cn=12	15^a,dn=12	47^a,en=12	50^a,en=12	37^a,fn=12	27 ± 10.7	15–37
BITB44	2015-03-23	39%transect	27^a,gn=36	39^a,b	—	33^a,cn=36	29^a,dn=36	44^a,en=36	47^a,en=36	39^a,fn=36	32 ± 5.1	27–39
BITB45	2015-03-23	45%transect	33^a,gn=13	45^a,b	—	45^a,cn=13	39^a,dn=13	51^a,en=13	52^a,en=13	36^a,fn=13	38 ± 4.8	33–45
BITB46	2015-03-23	32%transect	18^a,gn=11	32^a,b	—	28^a,cn=11	15^a,dn=11	35^a,en=10	38^a,en=10	31^a,fn=11	23 ± 7.6	15–31
BITB47	2015-03-24	53%transect	too few photos (n=2)^a,g,h	53^a,b	—	too few photos (n=2)^a,c,h	too few photos (n=2)^a,d,h	too few photos (n=2)^a,e,h	too few photos (n=2)^a,e,h	too few photos (n=2)^a,f,h	—	—
BICC50	2015-03-25	15%transect	16^a,gn=11	15^a,b	—	29^a,cn=11	30^a,dn=11	37^a,en=11	48^a,en=11	29^a,fn=11	26 ± 6.9	16–30
BICC51	2015-03-25	17%transect	21^a,gn=17	17^a,b	—	22^a,cn=17	24^a,dn=17	27^a,en=17	28^a,en=17	28^a,fn=17	24 ± 3.0	21–28
BIEA52	2015-03-25	37%transect	35^a,gn=22	37^a,b	—	38^a,cn=22	22^a,dn=22	50^a,en=22	50^a,en=22	39^a,fn=22	33 ± 8.0	22–39
BITB53	2015-03-26	33%transect	23^a,gn=22	33^a,b	—	35^a,cn=22	31^a,dn=22	41^a,en=22	42^a,en=22	27^a,fn=22	29 ± 5.0	23–35
BITB54	2015-03-26	56%transect	30^a,gn=99	56^a,b	—	34^a,cn=99	21^a,dn=99	50^a,en=97	54^a,en=97	31^a,fn=99	29 ± 5.8	21–34
BITB55	2015-03-26	51%transect	33^a,gn=14	51^a,b	—	43^a,cn=14	34^a,dn=14	47^a,en=14	51^a,en=14	38^a,fn=14	37 ± 4.7	33–43
BITB56	2015-03-27	25%transect	19^a,gn=13	25^a,b	—	20^a,cn=13	20^a,dn=13	25^a,en=13	26^a,en=13	18^a,fn=13	19 ± 1.0	18–20
BITB57	2015-03-27–28	43%transect	43^a,gn=111	43^a,b	—	44^a,cn=111	33^a,dn=111	66^a,en=111	68^a,en=111	36^a,fn=111	39 ± 5.3	33–44
BITB58	2015-03-28	67%transect	too few photos (n=1)^a,g,h	67^a,b	—	too few photos (n=1)^a,c,h	too few photos (n=1)^a,d,h	too few photos (n=1)^a,e,h	too few photos (n=1)^a,e,h	too few photos (n=1)^a,f,h	—	—

Notes for Chagos #1 2015 (16)

[a] Value from the map's computer-vision method tables (denominator and photo set as on the site's page).
[b] Gold = LOF in-water diver transect, the mean of all of the station's transects: a different instrument, site-level only, never within 200 m of the frames.
[c] CoralNet robot labels (the cover set), same denominator.
[d] DINOv3 point predictions at the same CoralNet points (2,500 frames).
[e] Coralscapes (v1 EPFL-ECEO/coralscapes-vit-b-dpt; v2 coralscapesv2-dinov3-vitb-lora-dpt) is not considered reliable for these photos: shown, never averaged. Area fraction, not a point count.
[f] 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.
[g] Claude run complete (2,500 of 2,500 frames; 2,495 assigned to these 104 site rows): blind calls at 30 CoralNet points on the EDITED website photos, HC+BL / (30 − WATER − FISH), unknown points kept.
[h] Too few photos (under 10) at this site for a value: not shown and not averaged (photo-count rule: 10 or more photos for a value, 20 or more for a confident one).
[i] The author's own CoralNet points on the ground-truth frames at this site (30 − WATER − FISH, unknown points kept).
[j] No LOF transect at this site: the gold cell is the author's own CoralNet points (frames manually annotated in CoralNet) instead.
[k] No LOF transect at this site.
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.
* The site's headline coral cover rests on only 10–19 reef-habitat photos; this estimate is less certain.
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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