Photo review
Field photographs
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Model color relief
Colors distinguish relative surface relief in the model and are paired with hillshade. No validated elevation scale or tidal-datum tie is published here.
Site assets
Photo review
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GPS ledger
Each value belongs to one GPS row; it is not a single elevation for the site. The CSV distinguishes local-datum height from receiver altitude.
| ID | Lat | Lon | Point height | V. accuracy |
|---|---|---|---|---|
| Matai Beach | -20.017516108 | -158.1021263385 | 6.26 | 0.179 |
| Matai base | -20.017516738135 | -158.10212767323 | 6.28 | 0.088615 |
| Matai base | -20.01751652985 | -158.102127040127 | 6.20 | 0.054475 |
| Matai base | -20.0175165797758 | -158.102126932172 | 6.22 | 0.05214 |
| Matai base | -20.0175166530408 | -158.102126950689 | 6.20 | 0.056825 |
| GCP3 Matai Base | -20.0175167098617 | -158.102126775828 | 6.23 | 0.05452 |
| GCP4 | -20.0180751462475 | -158.103190012492 | 6.28 | 0.05701 |
| GCP1 | -20.0179752552533 | -158.102836567138 | 5.54 | 0.05632 |
| GCP5 | -20.0175945489442 | -158.102003967099 | 7.02 | 0.054025 |
| GCP7 | -20.0178880196917 | -158.102575710217 | 5.83 | 0.06388 |
| HS101B | -20.0178937422375 | -158.102573955918 | 5.25 | 0.06226 |
| HS101C | -20.0179711450208 | -158.102687899127 | 4.66 | 0.065515 |
| HS101D | -20.0180048309517 | -158.102813597194 | 4.74 | 0.059385 |
| HS101E | -20.0180056357 | -158.102913098504 | 7.19 | 0.06013 |
| HS101F | -20.0178821822558 | -158.103010965466 | 8.49 | 0.075675 |
| HS101G | -20.0176262088417 | -158.102564568839 | 8.57 | 0.069425 |
| HS101A | -20.0178681814425 | -158.102424835467 | 4.33 | 0.068275 |
| Matai base RCC point a | -20.0175168005367 | -158.102127672683 | 6.21 | 0.083874 |
Samples
| Sample | Type | Time CKT | Position | Photos |
|---|---|---|---|---|
| HS101A | Fossilized coral | 2026-05-26 13:33 | -20.017868, -158.102425 4.333 m |
|
| HS101B | Fossilized coral | 2026-05-26 12:58 | -20.017894, -158.102574 5.252 m |
|
| HS101C | Fossilized coral | 2026-05-26 13:04 | -20.017971, -158.102688 4.663 m |
|
| HS101D | Fossilized coral | 2026-05-26 13:11 | -20.018005, -158.102814 4.736 m |
|
| HS101E | Fossilized coral | 2026-05-26 13:16 | -20.018006, -158.102913 7.188 m |
|
| HS101F | Fossilized coral | 2026-05-26 13:24 | -20.017882, -158.103011 8.491 m |
|
| HS101G | Fossilized coral | 2026-05-26 13:27 | -20.017626, -158.102565 8.573 m |
|
Raster data
The map’s DEM layer is a hillshade visualization. These links provide the source elevation raster and orthophoto as GeoTIFFs for local analysis. The DEM uses the island-specific datum.
SHA-256 checksums are included in the public manifest for reproducibility.
DEM transects
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No vertical exaggeration. Profiles run southeast to northwest across the DEM raster.
Animated geology plate
Atiu, Cook Islands
Surveyed 2026-05-26
Explore Matai’s lower, beach-facing branching-coral exposure with one close view and its matching field photograph.
Field photographs show upward branching coral fabric in the lower, beach-facing exposure. The 26 May field record describes large colonies in growth position, branches up to about 1 cm and corallites about 2 mm. The original photograph is registered to this model exposure using rock landmarks; it carries finer fabric detail than the reconstruction. The field notes report no clear separating sand layer or hiatus. No age, hiatus, precise taxon or sea-level datum is assigned. Vegetation hides much of the landward surface; roadside material may include moved boulders. Moving water and field gear are not geological evidence. All 417 cameras are aligned in one reviewed natural-tie network. A questionable unpinned control projection remains unedited. Reviewed sections and source-photo comparisons showed no broad doubled exposed surface; this is not a whole-site accuracy certification. Gray sides and backing are artificial presentation geometry. Original retained geometry, UVs and 18 diffuse plus 18 normal 8K maps are preserved.
F1 · Lower branching coral: field photograph (opens in a new tab)Explore further to begin the guided tour.