Table 2 Image sources used in this studys and their characteristic camera locations, Crater Lake views, and overall image qualities. High quality images had relatively high pixel resolution and captured the entire lake surface, providing confidence that all lake observations were identified correctly. Medium quality images showed most of the lake, but had relatively low pixel resolution, resulting in a moderate possibility that lake observations were missed. Low quality images only showed small areas of the lake and had relatively low pixel resolution, and thus were generally not catalogued
Image source | Dates taken | Camera location(s) | View of Crater Lake | Image quality |
|---|---|---|---|---|
This study | 2021 | Dome | Low angle | High |
GNS Science gas flight | 2003 – 2022 | Fixed wing aircraft | Low angle | High |
GNS Science sampling trip | 1960 – 2022 | Helicopter, Crater Lake outlet | High, and very low angle | High |
Ngāti Rangi, a local Māori tribe | 2014 – 2016 | Dome | Low angle | Moderate |
Department of Conservation (DOC) | 1995 – 2018 | Helicopter, Fixed wing aircraft, Dome, Crater Lake outlet | High, low, and very low angle | Moderate-high |
Hikers | 1902 – 2020 | Tahurangi Peak, Dome, Crater Lake outlet and rim | Medium, low, and very low angle | Low–high |
Literature | 1926 – 2008 | Helicopter, Fixed wing aircraft, Dome, Crater Lake outlet and rim | High, medium, and low angle | Low-medium |