Visualization of Coral Reef Cover with Photogrammetry Method at Coastal Waters of Lemon Island, Manokwari, Indonesia

Abstract

Lemon Island waters are an island that has a diversity of coral reef ecosystems. The coastal areas of Lemon Island have different coral reef structures, so it is necessary to conduct research using underwater photogrammetry to visualize the condition of coral reefs. Photogrammetry is a process of obtaining information about an object through measurements made from photographs. The use of underwater photogrammetry in visualizing coral reefs can also be used to extract coral conditions such as size, condition, and percentage of coral colony cover. This study aims to determine the shape and condition of the visual life form of coral reefs in the waters of Lemon Island. The method used in this research is the photogrammetric method which is then analyzed using CPCe, using the number of random points used to analyze 30 photos for each frame. Based on the results obtained, it can be seen 6 forms of coral growth found in the waters of Lemon Island, namely, Acropora Branching, Acropora Submassive, Coral Branching, Coral Massive, Coral Submassive and Coral Mushroom. The total percentage of coral reef cover is 45.84%, so it is categorized in moderate condition.