TAILIEUCHUNG - Advances in Sonar Technology 2012 Part 11

Tham khảo tài liệu 'advances in sonar technology 2012 part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | On the Benefits of Using Both Dual Frequency Side Scan Sonar and Optical Signatures for the Discrimination of Coral Reef Benthic Communities 183 Classification IKONOS data Side Scan Sonar data IKONOS side scan sonar data Medium resolution classification Sheet corals mainly Agaricia 1 16 43 43 Massive and encrusting corals 45 40 64 Dead coral Dead live coral cover 12 50 50 Green algae 50 algal cover 17 25 40 Bedrock and rubble with dense gorgonians 50 bare 23 40 33 Sand rubble with some algae 50 bare 25 40 40 Sand with some algae 50 bare 50 40 78 Sparse seagrass and algae 50 43 29 53 Medium density seagrass and algae 50 18 26 38 Dense seagrass and algae 50 100 22 38 Overall accuracy 29 34 52 Coarse resolution classification 1. Coral classes 0 78 78 2. Algal dominated 0 5 5 3. Bare substratum 58 52 76 4. Seagrass dominated 53 46 65 Overall accuracy 40 50 61 Table 10. Individual class user s accuracies and overall accuracies from the discriminant function analysis of the optical acoustic and combined datasets at the medium and coarse descriptive levels. The improvement in the discrimination of the dead coral class with the inclusion of the acoustic textural data is particularly significant for monitoring coral health. The results of the optical classification showed that diseased coral cannot be discriminated spectrally on the basis of IKONOS bands alone as due to their rapid colonization by macroalgae they are spectrally indistinguishable from macroalgal beds. This is evident in the misclassifications of the other classes seagrass sand with algae and massive coral classes into this class into the dead coral class Table 2 . Even after the inclusion of the sonar data the classification accuracy of this class is still not satisfactory 50 but the combination of the two datasets shows potential for improving the discrimination of diseased or dead coral. This may be attributed to the acoustic signatures of algae overlying dead coral

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