{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,28]],"date-time":"2026-03-28T06:40:34Z","timestamp":1774680034315,"version":"3.50.1"},"reference-count":66,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2016,2,25]],"date-time":"2016-02-25T00:00:00Z","timestamp":1456358400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Seventh Framework Programme","award":["EUFAR contract n\u00b0 227159, Cost Action ES0903-EUROSPEC and ESA Grant D\/EOP\/rp\/2012\/48"],"award-info":[{"award-number":["EUFAR contract n\u00b0 227159, Cost Action ES0903-EUROSPEC and ESA Grant D\/EOP\/rp\/2012\/48"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The broadband albedo values retrieved from satellite sensors are usually compared directly to ground measurements. Some authors have noted the necessity of high spatial resolution albedo estimates to fill the gap between ground measurements and satellite retrievals. In this respect, hyperspectral airborne data with high spatial resolution is a powerful tool. Here, a new operational method for the calculation of airborne broadband apparent albedo over the spectral range of 350\u20132500 nm is presented. This new method uses the Hemispherical Directional Reflectance Factor (HDRF) as a proxy for the narrowband albedo, assuming a Lambertian approximation. The broadband apparent albedo obtained is compared to that estimated using theapparent albedo equation devised for the Moderate Resolution Imaging Spectroradiometer (MODIS). Airborne data were collected using the Airborne Hyperspectral Scanner (AHS). Field data were acquired at three sites: a camelina field, a green grass field, and a vineyard.  The HDRF can be used to approximate the narrowband albedo for all View Zenith Angle (VZA) values for flights parallel to the solar principal plane (SPP); for flights orthogonal to the SPP, discrepancies are observed when the VZA approaches \u221245\u00b0. Root Mean Square Error (RMSE) values in the range 0.009\u20130.018 were obtained using the new method, improving upon previous results over the same area (RMSEs of 0.01\u20130.03). The relative error in the albedo estimation using the new method is 12% for \u221236.2\u00b0 &lt; VZA &lt; 40.8\u00b0 in the case of flights parallel to the SPP and less than 15% for \u221213\u00b0 &lt; VZA &lt; 45\u00b0 and 45% for VZA = \u221245\u00b0 for flights orthogonal to the SPP. The good performance of the new method lies in the use of the at-surface solar irradiance and the proposed integration method.<\/jats:p>","DOI":"10.3390\/rs8030183","type":"journal-article","created":{"date-parts":[[2016,2,25]],"date-time":"2016-02-25T10:24:25Z","timestamp":1456395865000},"page":"183","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["A New Method for the Estimation of Broadband Apparent Albedo Using Hyperspectral Airborne Hemispherical Directional Reflectance Factor Values"],"prefix":"10.3390","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0536-9934","authenticated-orcid":false,"given":"Javier","family":"Calleja","sequence":"first","affiliation":[{"name":"Departamento de F\u00edsica, Universidad de Oviedo, Calvo Sotelo s\/n, 33007 Oviedo, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9813-6798","authenticated-orcid":false,"given":"Carmen","family":"Recondo","sequence":"additional","affiliation":[{"name":"\u00c1rea de Ingenier\u00eda Cartogr\u00e1fica, Geod\u00e9sica y Fotogrametr\u00eda, Departamento de Explotaci\u00f3n y Prospecci\u00f3n de Minas, Universidad de Oviedo, Gonzalo Guti\u00e9rrez Quir\u00f3s s\/n, 33600 Mieres, Spain"},{"name":"Instituto de Recursos Naturales y Ordenaci\u00f3n del Territorio (INDUROT), Universidad de Oviedo, Gonzalo Guti\u00e9rrez Quir\u00f3s s\/n, 33600 Mieres, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7551-2236","authenticated-orcid":false,"given":"Juanjo","family":"Pe\u00f3n","sequence":"additional","affiliation":[{"name":"\u00c1rea de Ingenier\u00eda Cartogr\u00e1fica, Geod\u00e9sica y Fotogrametr\u00eda, Departamento de Explotaci\u00f3n y Prospecci\u00f3n de Minas, Universidad de Oviedo, Gonzalo Guti\u00e9rrez Quir\u00f3s s\/n, 33600 Mieres, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8267-0371","authenticated-orcid":false,"given":"Susana","family":"Fern\u00e1ndez","sequence":"additional","affiliation":[{"name":"Departamento de Geolog\u00eda, Universidad de Oviedo, Jes\u00fas Arias de Velasco s\/n, 33005 Oviedo, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fernando","family":"De la Cruz","sequence":"additional","affiliation":[{"name":"Instituto T\u00e9cnico Agron\u00f3mico Provincial (ITAP), Pol\u00edgono Industrial Campollano, Avda.2\u00aa, No. 42B, 02007 Albacete, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jos\u00e9","family":"Gonz\u00e1lez-Piqueras","sequence":"additional","affiliation":[{"name":"Instituto Desarrollo Regional (IDR), Grupo Teledetecci\u00f3n y SIG, Universidad Castilla La Mancha, Campus Universitario s\/n, 02071 Albacete, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2016,2,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"263","DOI":"10.1016\/0168-1923(95)02265-Y","article-title":"Source approach for estimating soil and vegetation energy fluxes in observations of directional radiometric surface temperature","volume":"77","author":"Norman","year":"1995","journal-title":"Agric. 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