Fig. 4
From: Automated tracking of lava lake level using thermal images at Kīlauea Volcano, Hawai’i
Scatter plot of automated lava-level measurement, measured in pixels from the bottom of the image (Fig. 2f), with the lava lake level as measured by a laser rangefinder. Data collected between January and May 2014. The hourly mean of the automated measurement is used here. The laser rangefinder results show the depth of the lava lake below the Overlook crater rim, which was at about 1023 m elevation above sea level in 2014. The red line shows the best linear fit, while the green lines represent ±2 times the standard error