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  • The Status of Ecosystem Examined by Microwave Data

    Paper number

    IAC-08.B1.4.12

    Author

    Prof. Katarzyna Dabrowska-Zielinska, Institute of Geodesy and Cartography, Poland

    Coauthor

    Dr. Maria Budzynska, Institute of Geodesy and Cartography, Poland

    Coauthor

    Mrs. Wanda Kowalik, Institute of Geodesy and Cartography, Poland

    Year

    2008

    Abstract

    The aim of the study was to examine the use of radar data for describing the soil-vegetation parameters for agri–environment and wetland ecosystem. The backscattering coefficient was calculated from SAR and ASAR under various polarization and incidence angle. The most significant parameters for prediction of biomass under specific crop type and structure are: Leaf Area Index and soil moisture. During the Acquisition of ENVISAT ASAR data the extensive field measurements as soil moisture, Leaf Area Index, height of the vegetation, wet and dry biomass, and vegetation water content (VWC) have been carried out. Also the information concerning the crop type (winter and spring wheat, corn, barley, and sugar beet) and its actual development stage and growing conditions were recorded. The field measurements were carried out for agricultural region and wetland areas localized in Poland from April to August each year from 2003 - 2007. The measurements were carried out simultaneously to ENVISAT and ERS-2 satellite overpasses. The radar data used for the study varied with the swath type and polarization modes. The examinations of the influence of various descriptors of crop on backscatter coefficient under various soil conditions were examined. Among the considered swath type and polarisations, the best combination for calculation soil moisture differed with the vegetation cover. That’s why the first approach was to select different development stage of vegetation for agriculture area and different wetland vegetation habitats with various surface roughnesses. The backscatter varied with different soil-vegetation descriptors. For the tillering and jointing stage when still winter wheat did not cover fully the soil - the best results in obtaining the soil moisture was to apply IS4 VV, IS6 VV and ERS-2 VV. For full cover of soil with winter wheat for the development stage of heading, milk rape and maturity the best results in obtaining soil moisture was low incidence angle of IS2 and HH polarisation. Within the vegetation classified area the wetland humidity classes were distinguished using HH polarisation of IS2 and IS4. The backscatter of VH IS4 was sensitive to vegetation cover represented by LAI and HH IS2 sensitive to soil moisture. The ENVISAT ASAR mode with higher angles give better results, what could be noticed applying VV IS6 data for correlation between backscatter and LAI for dense vegetation. Soil moisture conditions at the study agriculture area in Poland varied, from low, less than 5% for agriculture area when there was drought and up to 30% and the sensitivity of recorded radar signal has been examined for dry and wet conditions. The study has been performed under ESA CAT-1 1427 project and AO-ID122.

    Abstract document

    IAC-08.B1.4.12.pdf

    Manuscript document

    IAC-08.B1.4.12.pdf (🔒 authorized access only).

    To get the manuscript, please contact IAF Secretariat.