This ZIP compressed distribution file contains the original data related to manuscript "Drone-based electromagnetic survey system for geophysical applications" by Markku Pirttijärvi, Ari Saartenoja & Pekka Korkeakangas submitted to Open Research Europe (https://open-research-europe.ec.europa.eu/) in June 2021. The data, presented as simple column formatted text files, are put into two folders, Lintumaansuo and Ervastinranta. Lintumaansuo contains data related to Figs. 11-14 of the manuscript. Ervastinranta contains data related to Figs. 15-17 of the manuscript. Extra data provide background maps and digital elevation models (copyright National Land Survey of Finland, 2020) for Lintumaansuo and Ervastinranta survey sites. The data in this distribution originated in Horizon 2020 project, NEXT - New Exploration Technologies (Grant Agreement No. 776804 — H2020-SC5-2017). For more detailed information about the data, please, refer to the Readme*.txt file included with the distribution.