Fig. 3
From: Automated tracking of lava lake level using thermal images at Kīlauea Volcano, Hawai’i
Comparison of automated lava-level estimate (blue) with manual measurements (red). a. Lava level from April 1 to June 5, 2014. The measurements are done in terms of image pixels, and the hourly mean of the automated measurement is used here for comparison. The automated measurements are reasonably effective at following the actual lava level, with minor errors. b. Histogram of the difference between corresponding automated and manual measurements from the thermal images, calculated using one year of data (June 2013 to June 2014)