Journal
ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION
Volume 10, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/ijgi10060355
Keywords
analyses; hyperspectral; nitrogen; PLSR method; soil properties
Funding
- Internal Grant Agency of Palacky University Olomouc [IGA_PrF_2021_020]
- Technology Agency of the Czech Republic [TA04020888]
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Soil is a significant natural resource composed of organic and inorganic material, with nitrogen being an essential element traditionally measured using laboratory methods. The development of hyperspectral imaging allows for cost-effective acquisition of both spectral and spatial information for detecting soil attributes. This study evaluates the suitability of airborne hyperspectral imaging for determining soil nitrogen content and producing a soil nitrogen map on a pixel-wise basis.
Soil is a significant natural resource composed of organic and inorganic material. Nitrogen, one of the essential elements, is traditionally measured using laboratory methods. The development of hyperspectral imaging enables the cost-effective acquisition of both spectral and spatial information for detecting physical, chemical, and biological attributes of the soil samples. The presented work evaluates the suitability of airborne hyperspectral imaging for determining soil nitrogen content and producing a soil nitrogen map on a pixel-wise basis. The measurement of spatial variability of the soil nitrogen content was taken at two fields located at Rudice, in northeast Brno, Czech Republic, using laboratory methods and a handheld spectrometer. The soil reflectance was also recorded using airborne-mounted imaging spectroscopy sensors. A partial least squares regression was used to develop a model for the calibration of the data collected with a portable spectrometer and to predict the total nitrogen in the soils based on hyperspectral images from airborne sensors. The determination factor for the PLSR model presented in this paper reached an R-2 of 0.44. The model's performance could be improved by using a handheld spectrometer with a wider spectral range, using the same acquisition period for field data collection and hyperspectral imaging, and enlarging the sample size.
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