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- Title
Sentinel-2 for Mapping Iron Absorption Feature Parameters.
- Authors
van der Werff, Harald; van der Meer, Freek
- Abstract
Iron is an indicator for soil fertility and the usability of an area for cultivating crops. Remote sensing is the only suitable tool for surveying large areas at a high temporal and spatial interval, yet a relative high spectral resolution is needed for mapping iron contents with reflectance data. Sentinel-2 has several bands that cover the 0.9 m iron absorption feature, while space-borne sensors traditionally used for geologic remote sensing, like ASTER and Landsat, had only one band in this feature. In this paper, we introduce a curve-fitting technique for Sentinel-2 that approximates the iron absorption feature at a hyperspectral resolution. We test our technique on library spectra of different iron bearing minerals and we apply it to a Sentinel-2 image synthesized from an airborne hyperspectral dataset. Our method finds the wavelength position of maximum absorption and absolute absorption depth for minerals Beryl, Bronzite, Goethite, Jarosite and Hematite. Sentinel-2 offers information on the 0.9 m absorption feature that until now was reserved for hyperspectral instruments. Being a satellite mission, this information comes at a lower spatial resolution than airborne hyperspectral data, but with a large spatial coverage and frequent revisit time.
- Subjects
SOIL fertility; ABSORPTION; IRON; SOIL composition; FEATURE extraction; HYPERSPECTRAL imaging systems
- Publication
Remote Sensing, 2015, Vol 7, Issue 10, p12635
- ISSN
2072-4292
- Publication type
Article
- DOI
10.3390/rs71012635