期刊
REMOTE SENSING
卷 6, 期 12, 页码 11956-11976出版社
MDPI
DOI: 10.3390/rs61211956
关键词
qanats; extraction; archaeological traces; circular Hough transform; Google Earth; very high resolution
类别
资金
- National Natural Science Foundation of China [41271427]
- National Key Technology RD Program Grant [2012BAH27B05]
- Directorial Foundation for Doctoral Student Research from Institute of Remote Sensing and Digital Earth (RADI)
- State Administration of Cultural Heritage
Qanats in northern Xinjiang of China provide valuable information for agriculturists and anthropologists who seek fundamental understanding of the distribution of qanat water supply systems with regard to water resource utilization, the development of oasis agriculture, and eventually climate change. Only the tops of qanat shafts (TQSs), indicating the course of the qanats, can be observed from space, and their circular archaeological traces can also be seen in very high resolution imagery in Google Earth. The small size of the TQSs, vast search regions, and degraded features make manually extracting them from remote sensing images difficult and costly. This paper proposes an automated TQS extraction method that adopts mathematical morphological processing methods before an edge detecting module is used in the circular Hough transform approach. The accuracy assessment criteria for the proposed method include: (i) extraction percentage (E) = 95.9%, branch factor (B) = 0 and quality percentage (Q) = 95.9% in Site 1; and (ii) extraction percentage (E) = 83.4%, branch factor (B) = 0.058 and quality percentage (Q) = 79.5% in Site 2. Compared with the standard circular Hough transform, the quality percentages (Q) of our proposed method were improved to 95.9% and 79.5% from 86.3% and 65.8% in test sites 1 and 2, respectively. The results demonstrate that wide-area discovery and mapping can be performed much more effectively based on our proposed method.
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