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Abstract:

The spatial sampling interval, as related to the ability to digitize a soil profile with a certain number of features per unit length, depends on the profiling technique itself. From a variety of profiling techniques, roughness parameters are estimated at different sampling intervals. Since soil profiles have continuous spectral components, it is clear that roughness parameters are influenced by the sampling interval of the measurement device employed. In this work, we contributed to answer which sampling interval the profiles needed to be measured at to accurately account for the microwave response of agricultural surfaces. For this purpose, a 2-D laser profiler was built and used to measure surface soil roughness at field scale over agricultural sites in Argentina. Sampling intervals ranged from large (50 mm) to small ones (1 mm), with several intermediate values. Large- and intermediate-sampling-interval profiles were synthetically derived from nominal, 1 mm ones. With these data, the effect of sampling-interval-dependent roughness parameters on backscatter response was assessed using the theoretical backscatter model IEM2M. Simulations demonstrated that variations of roughness parameters depended on the working wavelength and was less important at L-band than at C- or X-band. In any case, an underestimation of the backscattering coefficient of about 1-4 dB was observed at larger sampling intervals. As a general rule a sampling interval of 15 mm can be recommended for L-band and 5 mm for C-band.

Registro:

Documento: Artículo
Título:Effects of spatial sampling interval on roughness parameters and microwave backscatter over agricultural soil surfaces
Autor:Barber, M.E.; Grings, F.M.; álvarez-Mozos, J.; Piscitelli, M.; Perna, P.A.; Karszenbaum, H.
Filiación:Grupo de Teledetección Cuantitativa, Instituto de Astronomía y Física del Espacio (IAFE, CONICET-UBA), Int. Guiraldez 2700, Buenos Aires, 1428, Argentina
Departamento de Proyectos e Ingeniería Rural, Universidad Pública de Navarra, Campus de Arrosadía, Pamplona, 31006, Spain
Cátedra de Conservación y Manejo de Suelos, Facultad de Agronomía, Universidad Nacional del Centro de la Pcia. de Buenos Aires (UNICEN), Gral. Pinto 399, Tandil, 7000, Argentina
Palabras clave:Correlation length; Height standard deviation; Laser profiler; Radar applications; Scattering models; Surface soil roughness; Agriculture; Backscattering; Parameter estimation; Soils; Surface roughness; Correlation lengths; Laser profilers; Radar applications; Scattering model; Standard deviation; Surface soil; Soil surveys
Año:2016
Volumen:8
Número:6
DOI: http://dx.doi.org/10.3390/rs8060458
Título revista:Remote Sensing
Título revista abreviado:Remote Sens.
ISSN:20724292
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20724292_v8_n6_p_Barber

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Citas:

---------- APA ----------
Barber, M.E., Grings, F.M., álvarez-Mozos, J., Piscitelli, M., Perna, P.A. & Karszenbaum, H. (2016) . Effects of spatial sampling interval on roughness parameters and microwave backscatter over agricultural soil surfaces. Remote Sensing, 8(6).
http://dx.doi.org/10.3390/rs8060458
---------- CHICAGO ----------
Barber, M.E., Grings, F.M., álvarez-Mozos, J., Piscitelli, M., Perna, P.A., Karszenbaum, H. "Effects of spatial sampling interval on roughness parameters and microwave backscatter over agricultural soil surfaces" . Remote Sensing 8, no. 6 (2016).
http://dx.doi.org/10.3390/rs8060458
---------- MLA ----------
Barber, M.E., Grings, F.M., álvarez-Mozos, J., Piscitelli, M., Perna, P.A., Karszenbaum, H. "Effects of spatial sampling interval on roughness parameters and microwave backscatter over agricultural soil surfaces" . Remote Sensing, vol. 8, no. 6, 2016.
http://dx.doi.org/10.3390/rs8060458
---------- VANCOUVER ----------
Barber, M.E., Grings, F.M., álvarez-Mozos, J., Piscitelli, M., Perna, P.A., Karszenbaum, H. Effects of spatial sampling interval on roughness parameters and microwave backscatter over agricultural soil surfaces. Remote Sens. 2016;8(6).
http://dx.doi.org/10.3390/rs8060458