HESS Hydrology and Earth System Sciences HESS Hydrol. Earth Syst. Sci. 1607-7938 Copernicus Publications Göttingen, Germany 10.5194/hess-13-833-2009 EAGLE 2006 – Multi-purpose, multi-angle and multi-sensor in-situ and airborne campaigns over grassland and forest Su Z. 1 Timmermans W. J. 1 van der Tol C. 1 Dost R. 1 Bianchi R. 2 Gómez J. A. 3 House A. 4 Hajnsek I. 5 Menenti M. 6 Magliulo V. 6 Esposito M. 6 Haarbrink R. 7 Bosveld F. 8 Rothe R. 8 Baltink H. K. 8 Vekerdy Z. 1 Sobrino J. A. 9 Timmermans J. 1 van Laake P. 10 Salama S. 10 van der Kwast H. 11 Claassen E. 12 Stolk A. 13 Jia L. 14 Moors E. 14 Hartogensis O. 15 Gillespie A. 16 International Institute for Geo-information Sciences and Earth Observation, Department of Water Resources, P.O. Box 6, 7500 AA, Enschede, The Netherlands European Space Agency, Earth Observation Center, Via Galileo Galilei, 00044 Frascati, Italy Instituto Nacional de Técnica Aeroespacial, Area de Teledetección, Dpto. de Observ. de la Tierra, Teledetección y Atmósfera, Carretera de Ajalvir, p.k. 4 – 28850 Torrejón de Ardoz, Madrid, Spain ITRES Research Limited, Suite 110, 3553 – 31st Street NW, Calgary, Alberta, Canada German Aerospace Center, Microwaves and Radar Institute, P.O. Box 11 16, 82230 Wessling, Germany National Research Council (CNR), Institute for mediterranean agriculture and forest systems (ISAFoM), Via Patacca 85, 80056 Ercolano (NA), Italy MIRAMAP, ESA/ESTEC (TEC-ST), P.O. Box 299, 2200 AG, Noordwijk, The Netherlands Royal Netherlands Meteorological Institute, P.O. Box 201, 3730 AE, De Bilt, The Netherlands Universidad de Valencia, Faculty of Physics, Department of Thermodynamics, Global Change Unit, c/Dr. Moliner, 50, 46100 Burjassot, Spain International Institute for Geo-Information Science and Earth Observation, Dept. of Natural Resources, P.O. Box 6, 7500 AA, Enschede, The Netherlands Utrecht University, Department of Physical Geography, Faculty of Geosciences, P.O. Box 80.115, 3508 TC, Utrecht, The Netherlands FUGRO-Inpark B.V., Dillenburgsingel 69, 2263 HW Leidschendam, The Netherlands National Institute for Public Health and the Environment, P.O. Box 1, 3720 BA, Bilthoven, The Netherlands Wageningen University and Research Centre, Alterra P.O. Box 47, 6700 AA Wageningen The Netherlands Wageningen University, Meteorology and Air Quality Group, P.O. Box 47, 6700 AA Wageningen, The Netherlands University of Washington, Johnson Hall 070, P.O. Box 351310, 4000 15th Avenue NE, Seattle, WA 98195-1310, USA 18 06 2009 13 6 833 845 Copyright: © 2009 Z. Su et al. 2009 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://hess.copernicus.org/articles/13/833/2009/hess-13-833-2009.html The full text article is available as a PDF file from https://hess.copernicus.org/articles/13/833/2009/hess-13-833-2009.pdf

EAGLE2006 – an intensive field campaign for the advances in land surface hydrometeorological processes – was carried out in the Netherlands from 8th to 18th June 2006, involving 16 institutions with in total 67 people from 16 different countries. In addition to the acquisition of multi-angle and multi-sensor satellite data, several airborne instruments – an optical imaging sensor, an imaging microwave radiometer, and a flux airplane – were deployed and extensive ground measurements were conducted over one grassland site at Cabauw and two forest sites at Loobos and Speulderbos in the central part of the Netherlands. The generated data set is both unique and urgently needed for the development and validation of models and inversion algorithms for quantitative land surface parameter estimation and land surface hydrometeorological process studies. EAGLE2006 was led by the Department of Water Resources of the International Institute for Geo-Information Science and Earth Observation (ITC) and originated from the combination of a number of initiatives supported by different funding agencies. The objectives of the EAGLE2006 campaign were closely related to the objectives of other European Space Agency (ESA) campaign activities (SPARC2004, SEN2FLEX2005 and especially AGRISAR2006). However, one important objective of the EAGLE2006 campaign is to build up a data base for the investigation and validation of the retrieval of bio-geophysical parameters, obtained at different radar frequencies (X-, C- and L-Band) and at hyperspectral optical and thermal bands acquired simultaneously over contrasting vegetated fields (forest and grassland). As such, all activities were related to algorithm development for future satellite missions such as the Sentinels and for validation of retrievals of land surface parameters with optical and thermal and microwave sensors onboard current and future satellite missions. This contribution describes the campaign objectives and provides an overview of the airborne and field campaign dataset. This dataset is available for scientific investigations and can be accessed on the ESA Principal Investigator Portal <a href="http://eopi.esa.int/" target="_blank">http://eopi.esa.int/</a>.

 References DLR: AGRISAR 2006 – Agricultural Bio-/Geophysical Retrievals from Frequent Repeat SAR and Optical Imaging, Final Report, <a href="http://earth.esa.int/campaigns/DOC/AGRISAR_Final_Report.pdf">http://earth.esa.int/campaigns/DOC/AGRISAR_Final_Report.pdf</a>, 2008. ESA: The Changing Earth: New Scientific Challenges for ESA's Living Planet Programme, ESA SP-1304, 83 pp., 2006. ESA: AgriSAR and EAGLE Final Workshop, ESA-ESTEC Noordwijk, 15–16 October 2007, The Netherlands, Proceedings WPP-279, 2007. Foken, T., Wimmer, F., Mauder, M., Thomas, C., and Liebethal, C.: Some aspects of the energy balance closure problem, Atmos. Chem. Phys., 6, 4395–4402, 2006. GEO, The Global Earth Observation System of Systems (GEOSS) 10-Year Implementation Plan, Reference document, GEO 204/ESA SP-1284, ISBN No.:92-9092-986-3, 93 pp., 2005. Sobrino, J. A., Jiménez-Muñoz, J. C., Sòria, G., Gómez, M., Ortiz, A. Barella, Romaguera, M., Zaragoza, M., Julien, Y., Cuenca, J., Atitar, M., Hidalgo, V., Franch, B., Mattar, C., Ruescas, A., Morales, L., Gillespie, A., Balick, L., Su, Z., Nerry, F., Peres, L., and Libonati, R.: Thermal remote sensing in the framework of the SEN2FLEX project: field measurements, airborne data and applications, Int. J. Remote Sens., 29(17), 4961–4991, 2008. Su, Z., Timmermans, W. J., Gieske, A., Jia, L., Elbers, J. A., Olioso, A., Timmermans, J., Van Der Velde, R., Jin, X.,Van Der Kwast, H., Nerry, F., Sabol, D., Sobrino, J. A., Moreno, J., and Bianchi, R.: Quantification of land-atmosphere exchanges of water, energy and carbon dioxide in space and time over the heterogeneous Barrax site, Int. J. Remote Sens., 29(17), 5215–5235, 2008. Timmermans, J., van der Tol, C., Verhoef, W., and Su, Z.: Contact and directional radiative temperature measurements of sunlit and shaded land surface components during the SEN2FLEX 2005 campaign, Int. J. Remote Sens., 29(17), 5183–5192, 2008c. Timmermans, J., Verhoef, W., Van der Tol, C., Su, Z.: Retrieval of canopy component temperatures through Bayesian inversion of directional thermal measurements, Hydrol. Earth Syst. Sci. Discuss., submitted, 2009b. Timmermans, W. J., Bertoldi, G., Albertson, J. D., Olioso, A., Su, Z., and Gieske, A. S. M.: Accounting for atmospheric boundary layer variability on flux estimation from RS observations, Int. J. Remote Sens., 29(17), 5275–5290, 2008b. Timmermans, W. J., Dost, R., and Su, Z.: EAGLE 2006 – EAGLE Netherlands Multi-purpose, Multi-Angle and Multi-sensor In-situ, Airborne and Space Borne Campaigns over Grassland and Forest, Final report, <a href="http://earth.esa.int/campaigns/DOC/EAGLE_Final_Report.pdf">http://earth.esa.int/campaigns/DOC/EAGLE_Final_Report.pdf</a>, 2008a. Timmermans, W. J., Su, Z., and Olioso, A.: Footprint issues in scintillometry over heterogeneous landscapes, Hydrol. Earth Syst. Sci. Discuss., 6, 2099–2127, 2009a. Ulden A. P. V. and Wieringa J.: Atmospheric boundary layer research at Cabauw, Bound.-Lay. Meteorol., 78, 39–69, 1996. van der Tol, C., van der Tol, S., Verhoef, A., Su, B., Timmermans, J., Houldcroft, C., and Gieske, A.: A Bayesian approach to estimate sensible and latent heat over vegetation, Hydrol. Earth Syst. Sci. Discuss., 6, 2337–2365, 2009.