This Supplementary File accompanies the manuscript, 
Vásconez Müller, A., Bernard, B. and Vasconez, F. J. (2024) “Near-real-time ash cloud height estimation based on GOES-16 satellite imagery: A case study of the 2022–2023 eruption of Cotopaxi volcano, Ecuador”, Volcanica, 7(1), pp. 405–419. doi: 10.30909/vol.07.01.405419.
 
Supplementary Material 1: Sample images captured by five and seven webcams located around Cotopaxi volcano on 26 February and 5 July 2023, respectively. The 46 images from February found in folder 26-02-2023 show an ash emission as captured by the five operative cameras approximately between 13:20 and 13:45 UTC, while the folder 05-07-2023 contains 58 images from all seven webcams capturing an ash emission in July between 12:10 and 12:35 UTC. Each image name denotes the camera name acronym, as well as the image date (yyyymmdd) and time (hhmm) in UTC. In addition, each image is included once without and once with the stencil overlay. The acronyms correspond to the following camera names as listed in the manuscript in Table 1: BRALTA = Barranca Alta, LMRCD = La Merced, rumhvis = Rumiñahui, snchlg = Sincholagua, tmb = Tambo, wiraVIS = WIRA.
 
Supplementary Material 2: Spreadsheet with formulas described in the Data and Methods section of the manuscript to estimate ash cloud height and speed based on the direction and brightness temperature of the ash emissions, with three example calculations, one for 26 February and two for 4 May, 2023. This supplementary file includes two folders with input data for both examples. Input data includes the RGB and BT GOES-16 images, as well as the READY Sounding atmospheric profiles used for the example calculations, in addition to the corresponding Washington VAAC advisory files.
 
Supplementary Material 3: Compilation of scatter plots of ash cloud heights obtained via the six different methods plotted against each other, to complement the scatter plots shown in the manuscript in Figure 6.