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FAO FISHERIES TECHNICAL PAPER 459
Mapping Coastal Aquaculture and Fisheries Structures by
Satellite Imaging Radar:
Case Study of the Lingayen Gulf, the Philippines
by
Carlo Travaglia
Environment and Natural Resources Service
FAO Sustainable Development Department
Rome, Italy
Giuliana Profeti
SAR Image Processing
Florence, Italy
José Aguilar-Manjarrez
Inland Water Resources and Aquaculture Service
FAO Fisheries Department
Rome, Italy
and
Nelson A. Lopez
Bureau of Fisheries and Aquatic Resources
Manila, the Philippines
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FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
Rome, 2004
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Table of Contents
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Cover image:
Fish cages, fish traps and fish ponds in the Lingayen Gulf
area, northern Luzon, the Philippines. RADARSAT 1 SAR fine resolution image
(acquired 4 February 2001).
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or concerning the delimitation of its frontiers or boundaries.
ISSN 0429-9345
ISBN 92-5-105114-3
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© FAO 2004
Travaglia, C.; Profeti, G.;
Aguilar-Manjarrez, J.; Lopez,
N.A.
Mapping coastal aquaculture and fisheries structures by
satellite imaging radar.
Case study of the Lingayen Gulf,
the
Philippines.
FAO Fisheries Technical Paper. No. 459. Rome, FAO.
2004. 45p.
ABSTRACT
Inventory and monitoring of coastal aquaculture and fisheries
structures provide important baseline data for decision-making in planning and
development, including regulatory laws, environmental protection and revenue
collection. Mapping these structures can be performed with good accuracy and at
regular intervals by satellite remote sensing, which allows observation of vast
areas, often of difficult accessibility, at a fraction of the cost of
traditional surveys.
Satellite imaging radar (SAR) data are unique for this task
not only for their inherent all-weather capabilities, very important as
aquaculture activities mainly occur in tropical and subtropical areas, but
essentially because the backscatter from the structure components allows for
their identification and separation from other features.
The area selected and object of the study has been Lingayen
Gulf, sited in Northwestern Luzon Island, the Philippines, where all these
structures of interest occur.
Field verification of the methodology resulted in the
following accuracy: fishponds 95 percent, fish pens 100 percent. Mapping
accuracy for fish cages was estimated at 90 percent and for fish traps at 70
percent.
The study is based on interpretation of SAR satellite data and
a detailed image analysis procedure is described. The report aims at the
necessary technology transfer for an operational use of the approach indicated
in other similar environments.
Keywords: Aquaculture; Fisheries structures; Geographic
Information Systems; Lingayen Gulf; Philippines; Remote Sensing; SAR; Satellite
imaging radar.
Foreword
Acknowledgements
1.
Introduction
1.1 Background: the Sri Lanka
experience on mapping inland aquaculture farms
1.2 Objective of the present
study
1.3 Description of the test
area
1.4 Description of the structures:
fish pens, cages and traps
2. Methodology
2.1 Data and software
used
2.2 Preparation of the vector
database
2.3 Mapping aquaculture and fisheries
structures by satellite imaging radar
2.4 Image pre-processing
procedure
2.5 Digitalization of the
shoreline
2.6 Mapping procedures
3. Results
3.1 Fishponds
3.2 Fish pens
3.3 Fish cages
3.4 Fish traps
3.5 Land cover changes
3.6 Field verification
exercise
4. Discussion
4.1 RADARSAT fine beam
4.2 ERS SAR
4.3 Final considerations and
recommendations
5. Glossary
References
Recommended further
reading
Appendix: Map of coastal aquaculture
and fisheries structures in Lingayen Gulf, the Philippines
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