Coral Cover: Chagos #1 2015

Shaded value = in the CV mean (shade deepens with cover) Grey italic = shown for comparison but left out of the CV mean: the gold standard and manual CoralNet annotations (human 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 · 1,324 photos

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

Site	Date	Claude	Gold standard	Manually annotated in CoralNet	CoralNet	DINOv3	Coralscapes v1	Coralscapes v2	CoralSCOP	Mean ± SD of CV	Range
BICA01	2015-03-09	0.0n=1	4.6	0.0n=1	—	3.3n=1	1.3n=1	0.4n=1	0.3n=1	1.2 ± 1.8	0.0–3.3
BIEG02	2015-03-10	18.2n=21	31.8	25.5n=21	—	23.7n=21	31.1n=21	34.5n=21	23.7n=21	21.9 ± 3.2	18.2–23.7
BIEG03	2015-03-10	16.6n=36	37.3	23.9n=36	—	18.4n=36	31.5n=36	34.0n=36	25.7n=36	20.2 ± 4.8	16.6–25.7
BIEG04	2015-03-10	25.9n=19	29.2	33.9n=19	—	35.1n=19	36.4n=19	38.7n=19	28.2n=19	29.7 ± 4.8	25.9–35.1
BIEG05	2015-03-11	39.1n=59	46.7	40.7n=35	57.8n=24	40.2n=59	61.2n=59	63.6n=59	41.4n=59	44.6 ± 8.8	39.1–57.8
BIEG06	2015-03-11	31.6n=30	43.5	—	44.2n=30	34.0n=30	46.0n=30	46.5n=30	22.6n=30	33.1 ± 8.9	22.6–44.2
BIEG07	2015-03-11	28.5n=8	47.5	40.6n=8	—	56.7n=8	30.9n=8	33.5n=8	26.8n=8	37.3 ± 16.8	26.8–56.7
BIDI08	2015-03-12	35.2n=35	59.0	—	36.4n=35	29.1n=35	50.2n=35	53.1n=35	38.9n=35	34.9 ± 4.2	29.1–38.9
BIDI09	2015-03-12	33.6n=30	37.7	—	38.0n=30	23.6n=30	56.2n=30	61.0n=30	32.2n=30	31.9 ± 6.0	23.6–38.0
BIDI10	2015-03-12	22.5n=13	23.0	—	27.1n=13	16.2n=13	44.2n=13	49.4n=13	32.9n=13	24.7 ± 7.1	16.2–32.9
BIDI12	2015-03-13	2.9n=14	4.2	—	10.4n=14	11.0n=14	8.2n=14	10.0n=14	17.9n=14	10.6 ± 6.1	2.9–17.9
BIDI13	2015-03-13	17.8n=11	7.8	—	20.5n=11	18.2n=11	22.0n=11	23.5n=11	24.9n=11	20.4 ± 3.3	17.8–24.9
BIDI14	2015-03-13	19.2n=9	15.2	—	23.5n=9	21.9n=9	26.7n=9	26.2n=9	30.3n=9	23.7 ± 4.7	19.2–30.3
BIDI15	2015-03-14	36.4n=9	20.1	—	24.6n=9	37.0n=9	45.3n=9	48.3n=9	20.6n=9	29.6 ± 8.3	20.6–37.0
BIDI16	2015-03-14	24.4n=13	30.4	—	25.6n=13	22.3n=13	32.2n=13	35.6n=13	30.9n=13	25.8 ± 3.7	22.3–30.9
BIDI16.5	2015-03-14	26.3n=11	45.6n=13	—	38.7n=11	41.8n=11	37.2n=11	39.4n=11	29.7n=11	34.1 ± 7.3	26.3–41.8
BIEA18	2015-03-15	17.7n=35	20.7	—	22.3n=35	14.6n=35	32.9n=35	32.4n=34	28.1n=35	20.7 ± 5.9	14.6–28.1
BIEA19	2015-03-15	30.8n=14	27.5	—	27.2n=14	25.5n=14	41.9n=14	44.8n=14	39.2n=14	30.7 ± 6.1	25.5–39.2
BIEA20	2015-03-15	22.2n=19	10.8	—	24.6n=19	16.0n=19	30.8n=19	35.4n=19	27.1n=19	22.5 ± 4.8	16.0–27.1
BIEA22	2015-03-16	30.8n=23	21.6	—	49.2n=23	44.8n=23	44.0n=23	46.1n=23	50.0n=23	43.7 ± 8.9	30.8–50.0
BIEA23	2015-03-16	28.5n=24	24.6	—	35.7n=24	28.8n=24	43.8n=24	49.2n=24	39.5n=24	33.1 ± 5.4	28.5–39.5
BIEA24	2015-03-16	37.4n=11	12.7	—	40.6n=11	41.2n=11	48.5n=11	49.3n=11	39.2n=11	39.6 ± 1.7	37.4–41.2
BIEA24.5	2015-03-16	15.2n=5	—	—	19.6n=5	20.7n=5	20.3n=5	22.0n=5	21.2n=5	19.2 ± 2.7	15.2–21.2
BIEA25	2015-03-17	16.4n=19	15.7	—	29.5n=19	25.6n=19	31.1n=19	32.8n=19	29.8n=19	25.3 ± 6.2	16.4–29.8
BIEA26	2015-03-17	14.5n=30	21.0	—	21.0n=30	14.1n=30	23.3n=30	28.4n=30	27.2n=30	19.2 ± 6.2	14.1–27.2
BITB27	2015-03-17	23.8n=16	36.6	—	34.5n=16	24.4n=16	45.9n=16	47.8n=16	37.5n=16	30.1 ± 7.0	23.8–37.5
BITB28	2015-03-18	18.5n=43	28.5	—	26.9n=43	20.2n=43	33.5n=43	37.5n=43	29.0n=43	23.6 ± 5.1	18.5–29.0
BITB29	2015-03-18	18.5n=49	30.2	—	29.6n=49	23.7n=49	39.5n=49	42.1n=49	25.9n=49	24.4 ± 4.6	18.5–29.6
BITB30	2015-03-18	14.0n=12	42.5	—	29.9n=12	18.3n=12	33.9n=12	38.2n=12	30.3n=12	23.1 ± 8.2	14.0–30.3
BITB32	2015-03-19	11.7n=19	30.3	—	16.7n=19	11.8n=19	17.9n=19	19.8n=19	19.9n=19	15.0 ± 4.0	11.7–19.9
BITB33	2015-03-19	7.9n=27	18.5	—	20.3n=27	11.5n=27	18.4n=26	17.5n=26	22.3n=27	15.5 ± 6.9	7.9–22.3
BITB34	2015-03-19	37.0n=11	61.1	—	41.4n=11	34.5n=11	56.5n=11	66.7n=10	46.6n=11	39.9 ± 5.3	34.5–46.6
BITB34.5	2015-03-19	21.9n=3	—	—	47.2n=3	53.3n=3	29.2n=3	28.6n=3	33.4n=3	39.0 ± 14.1	21.9–53.3
BICC35	2015-03-20	6.7n=15	13.8	—	17.0n=15	13.1n=15	21.0n=15	23.9n=15	20.5n=15	14.3 ± 5.9	6.7–20.5
BICC36	2015-03-20	6.4n=15	5.8	—	19.4n=15	18.2n=15	21.0n=15	26.5n=15	24.7n=15	17.2 ± 7.7	6.4–24.7
BITB37	2015-03-20	29.0n=56	38.8	—	37.3n=56	29.6n=57	51.2n=55	54.5n=55	42.4n=57	34.6 ± 6.4	29.0–42.4
BITB38	2015-03-21	26.3n=44	56.0	—	33.7n=44	28.1n=44	54.1n=44	56.3n=44	31.5n=44	29.9 ± 3.3	26.3–33.7
BITB39	2015-03-21	36.7n=60	50.3	—	40.1n=60	31.7n=61	53.3n=59	57.5n=59	44.4n=61	38.2 ± 5.4	31.7–44.4
BITB40	2015-03-21	23.6n=5	44.9	—	28.5n=5	22.7n=5	39.7n=5	45.7n=5	30.8n=5	26.4 ± 3.9	22.7–30.8
BITB41	2015-03-22	24.9n=13	41.9	—	31.8n=13	31.8n=13	40.3n=13	42.0n=13	39.5n=13	32.0 ± 6.0	24.9–39.5
BITB42	2015-03-22	22.6n=49	36.2	—	31.1n=49	24.4n=51	39.5n=50	42.8n=51	35.4n=51	28.4 ± 5.9	22.6–35.4
BITB43	2015-03-22	22.3n=12	28.7	—	35.9n=12	14.7n=12	46.7n=12	50.3n=12	36.6n=12	27.4 ± 10.7	14.7–36.6
BITB44	2015-03-23	26.9n=36	40.5	—	33.2n=36	29.4n=36	44.2n=36	47.0n=36	38.7n=36	32.0 ± 5.1	26.9–38.7
BITB45	2015-03-23	33.3n=13	45.6	—	44.5n=13	39.2n=13	50.5n=13	51.9n=13	36.1n=13	38.3 ± 4.8	33.3–44.5
BITB46	2015-03-23	18.4n=11	25.8	—	27.5n=11	15.2n=11	34.5n=10	37.7n=10	31.3n=11	23.1 ± 7.5	15.2–31.3
BITB47	2015-03-24	25.5n=2	53.7	—	43.0n=2	35.0n=2	46.0n=2	45.2n=2	33.2n=2	34.2 ± 7.2	25.5–43.0
BICC50	2015-03-25	15.7n=11	12.1	—	29.4n=11	30.0n=11	36.9n=11	48.0n=11	28.8n=11	26.0 ± 6.9	15.7–30.0
BICC51	2015-03-25	20.7n=17	15.4	—	21.9n=17	24.1n=17	26.9n=17	28.4n=17	27.5n=17	23.6 ± 3.0	20.7–27.5
BIEA52	2015-03-25	34.5n=22	34.1	—	38.1n=22	21.8n=22	49.6n=22	50.0n=22	39.1n=22	33.4 ± 8.0	21.8–39.1
BITB53	2015-03-26	23.4n=22	36.7	—	35.2n=22	30.8n=22	40.7n=22	42.0n=22	27.4n=22	29.2 ± 5.0	23.4–35.2
BITB54	2015-03-26	29.8n=99	49.5	—	34.3n=99	20.8n=99	50.0n=97	53.9n=97	30.9n=99	28.9 ± 5.8	20.8–34.3
BITB55	2015-03-26	33.2n=14	47.6	—	43.3n=14	33.8n=14	47.1n=14	51.0n=14	38.3n=14	37.1 ± 4.7	33.2–43.3
BITB56	2015-03-27	19.4n=13	21.3	—	19.9n=13	20.3n=13	25.0n=13	26.2n=13	18.0n=13	19.4 ± 1.0	18.0–20.3
BITB57	2015-03-27–28	43.4n=111	40.1	—	44.0n=111	33.2n=111	65.6n=111	67.8n=111	36.4n=111	39.2 ± 5.3	33.2–44.0
BITB58	2015-03-28	31.0n=1	67.0	—	31.0n=1	40.0n=1	28.1n=1	32.6n=1	29.9n=1	33.0 ± 4.7	29.9–40.0
All sites (unweighted mean)		23.6	—	—	—	26.4	37.5	40.3	30.8	26.9 ± 3.6	23.6–30.8

Notes for Chagos #1 2015 (14)

[a] Value read from cv_method_tables.json (injector output, generated 2026-09-28 22:33); the scope text there gives denominator and frame set.
[b] Gold = LOF in-water diver transect (Mayfield & Dempsey 2026, Oceans 7:1, suppl. S1): 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 (CRD AI/chagos_cv_2026-09/chagos_dinov3_point_predictions.csv, 2,500 frames).
[e] Coralscapes (v1 EPFL-ECEO/coralscapes-vit-b-dpt; v2 coralscapesv2-dinov3-vitb-lora-dpt) is not trusted (Anderson): shown, never averaged. Area fraction, not a point count.
[f] GENUINELY NOT RUN: only the EDITED website photos were staged for CoralSCOP (Chagos_coralscop_20260920, 2,498 ok); no unedited Chagos CoralSCOP run exists (wide search 2026-09-29).
[g] 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.
[h] Claude arm chagos_claude_arm COMPLETE (2,500/2,500 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), Unk kept.
[i] Anderson's own CoralNet points on the ground-truth frames at this site (30 − WATER − FISH, Unk kept).
[j] No LOF transect at this site: the gold cell is Anderson's own CoralNet points (frames manually annotated in CoralNet) instead.
[k] No gold standard exists for this region.
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 but never averaged (*).
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.

All regions

This trip: what has run, photo basis and photo counts

Trip	Dives	Photos	Reference / transects	Manual points	CoralNet	Claude	DINOv3	Coralscapes v2	Coralscapes v1	CoralSCOP	Table
Chagos #1 2015	60	1,751 (101 dataless)	LOF GRE in-water transects	(120 frames at #1 sites)	(1,200 at #1 sites)	(1,320 at #1 sites)	(1,324 at #1 sites)	(1,314 at #1 sites)	(1,315 at #1 sites)	(1,324 at #1 sites)	included