Abstract
Abstract. The orbiting cycle and frequent cloud contamination have limited the applications of the moderate-resolution remotely sensed data for detecting rapid land cover changes that are critical to the monitoring of wetlands. It is necessary to use multiple remotely sensed data sources that have different spatial resolution and temporal frequency, because both spatial and temporal details are important in understanding the mechanisms in wetland cover changes. This study examined the applicability of linear spectral mixture analysis to the blended reflectance that was generated by incorporating the enhanced spatial and temporal adaptive reflectance fusion model (ESTARFM). Nine TM and MODIS images of the Poyang Lake area, China acquired in 2004 and 2005 were used to blend the reflectance. In order to account for the spectral variations in materials, we incorporated the multiple endmember spectral mixture analysis (MESMA) in unmixing the blended reflectance. The average absolute differences between the land cover fractions derived from the blended image and those from the observed image were calculated as well as correlation coefficients. Our results demonstrated that MESMA could unmix the blended reflectance generated by ESTARFM. However, due to the existence of the blended pixels with large difference in reflectance from the observed reflectance, the land cover fractions derived from the blended reflectance did not match with those derived from the observed reflectance as well as expected. It is also suggested that the comprehensiveness of the endmember spectral libraries was another factor influencing the agreement.
Highlights
Taking advantage of regular orbiting intervals and extensive coverage, satellite remote sensing has been utilized as a practical and economical means to monitor and inventory different types of wetlands (Ozesmi and Bauer, 2002)
This study investigates the applicability of spectral mixture analysis (SMA) to the blended data generated with the enhanced spatial and temporal adaptive reflectance fusion model (STARFM) (ESTARFM) by Zhu et al (2010) using nine pair time-series imagery of Landsat-5 Thematic Mapper (TM) and TERRA Moderate Resolution Imaging Spectroradiometer (MODIS) covering the Poyang Lake area of China in 2004 and 2005
One TM and one MODIS images were utilized on the dates denoted by lower case letters, while one MODIS image was utilized on the dates denoted by upper case letters
Summary
Taking advantage of regular orbiting intervals and extensive coverage, satellite remote sensing has been utilized as a practical and economical means to monitor and inventory different types of wetlands (Ozesmi and Bauer, 2002). A wide variety of time-series remotely sensed data observed with differing sensor designs have been used for the mapping of wetland cover changes, previous studies have shown that wetland mapping using optical remotely sensed data is not as easy as the mapping of other ecosystems (Silva et al, 2008). This is because the spectra of wetland vegetation species show a high level of variability due to the species' structural, biochemical, and biophysical diversity, as well as the spectral confusion among individual wetland components described above (Adam et al, 2010).
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