SUB-PIXEL IMAGE CLASSIFICATION OF HYPER-SPECTRAL DATA FOR VEGETATION AND SOIL MAPPINGIN SEMI-ARID ENVIRONMENT
| Main Author: | Perpustakaan UGM, i-lib |
|---|---|
| Format: | Article NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2009
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/27760/ http://i-lib.ugm.ac.id/jurnal/download.php?dataId=10823 |
Daftar Isi:
- The HyMap hyper-spectral data was used to classify photosynthetic vegetation (PV), non-photosynthetic vegetation (NPV), and exposed soils in a semiarid savannah environment of McKinlay, northern Queensland, and Australia. This study aimed to understandhow effective the sub-pixel classificationapproach applied on hyper-spectral data to distinguish the vegetation and soil features in semi-arid environment. In contrast to the per-pixel approach this approach treats the pixel value as reflectance sum of its composite features, and shows its component abundance. The most commonly used sub-pixel classification technique was used in this research, namely Linear Spectral Unmixing (LSU). End members were used as the input class, and the result was compared with the standard maximum likelihood classification (MLC) using post-classification comparison method The result of this study shows that LSU produced a patchy distribution of classes throughout the image. The brown soil tends to be over-estimated with respect to other classes. PV features were relatively well-mapped compare to other classes. NPV features have problem with domination of exposed soil reflectance. This is equivalent to the previous studies result that background soil dominates the spectral reflectance in this environment. According to the qualitative accuracy assessment, LSU has higher accuracy in representing PV and NPV compare to the traditional MLC classification.