Visual photographs taken during a helicopter overflight of Halema'uma'u crater on January 7, 2021 are used to create a 3D model of the crater. This technique is called structure-from-motion photogrammetry and uses the multiple perspectives captured in dozens of photos to reconstruct the crater shape on a computer. HVO scientists use these models to help calculate erupted volume, eruption rate, and measure the size of features in the crater. This video is a computer-generated fly-through of the J