This dataset supports the research study "Towards spatio-temporal estimation of evapotranspiration using electrical resistivity tomography in forests" by B. Loiseau, N. K. Martin-StPaul, D. Jougnot, C. Champollion, A. Olioso, V. Mercier, O. Marloie, L. Martin, H. Cochard, G. Simioni, L. Veuillen and S. D. Carrière We provide here the data that are not already publicly available online: Evapotranspiration data modeled with SimpKcET for the Larzac site. Electrical resistivity tomography (ERT), sap flow, soil water content, and soil temperature data for the Font-Blanche site. Below are links to other data used in this study that are already publicly available online: Field data used for the Larzac site: Sap flow and electrical resistivity tomography (ERT) data are freely available from the H+ database: DOI under preparation Soil water content and soil temperature data are freely available online via the OREME data portal: https://data.oreme.org/gek/gek/soil Meteorological data (precipitation) are freely available from Météo-France (Millau-Larzac station, Aveyron, France): https://meteo.data.gouv.fr/ Field data used for the Font-Blanche site: Meteorological data (precipitation) and eddy covariance data are available from: Simioni, G., Marloie, O., Martin - Saint Paul, N. (2026). Fluxnet Product from Font-Blanche, 2007-12-31–2024-12-31, FLUXNET, https://hdl.handle.net/11676/JO0ATz4S-kZYGBHshgmlVP3K