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Poster Session 2
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Identification of Landuse in Songkhla Lake
from the Globesar Data
Dr.Suvit Vibulsresth1, Dr.Darasri Dowreang1, Miss Supapis Polngam1,
Mr. Weerapant Musigasan1, Mr.Marc D'Lorio1
1National Research Council of Thailand, 196 Phaholyothin Road
Chatuchak, Bangkok, 10900, Thailand
Tel. 662-579-0345, Fax. 662-561-3035
2Prince of Songkhla University, Box 2, Kohong, Hat Yai,
Songkhla, 90112, Thailand, Tel. 662- 74-212895 :
3Canada Centre for Remote Sensing, 588 Booth Street,
Ottawa, Ontario, KIA OY7, Canada,
Tel. 613-947-, 1350, Fax. 613-947-1385
E-mail : diorio@ccrs.emr.ca
Abstract
As part of the GlobeSAR program, the simulated Radarsat data with fine resolution and standard modeproducts were generated from the SAR data which were acquired by the Canada Centre for Remote Sensing convair 580 aircraft with C-band and HH-VV polarizations. The data were taken in November 1993 covering Songkla lake and Thalae Luang area. During the data acquisition an extensive ground truth - information was collected to support data analysis and interpretation. The results showed that serveral land use classes could be identified and differentiated. These classes include shrimp farm and other aquaculture activities, rubber plantation, paddy field and urban area. Espectially the shrimp farm was clearly displayed on the single image. So there seems to be a potential for this data to be ~ used as a tool for monitoring the expansion of shrimp farms. However, it was found difficult to separate mixed ~ orchard from swamp forest area because of volume scattering from various sizes of canopy which made them : appear very bright with coarse texture on the image for both cases. Future study will include the use of color composite of the radar data and Visible -Infrared data as well as another SAR data as could be more ,61 favorable for land use study than a single image.
Introduction
The Canada Center for Remote Sensing (CCRS) and the National Research Council of Thailand.(NRCT) have coorperated under The GLOBESAR project since 1993. The purpose of this cooperation is to promote the application of radarsat data by inviting researchers from involved organizations who wish to conduct research using the radarsat data.
Under this project; 8 test sites were defined by researchers, each test site addresses the potentials of .", using radarsat image. TH4 is one of those test sites covering Songkhla lake and Thalae Luang area, Southern r Thailand. On November 5, 1993, airborne radarsat image was acquired by The Canadian SAR Sensor System, r1 on boarded convair .580 aircraft,. which operated in C-band with HH and VV polarization's. During such time, the area was. occupIed by growing stage of paddy and on terrace, there were :artless of feature that ranged From bare soil prepared for rubber, young rubber, and productive rubber plantations.
2. Project Objectives
To study how radarsat data can be used as inputs for development planning and monitoring of the project area
3. Study Area
The study area covers most of Songkhla lake -Thalae Luang area. It lies approximately between latitude 6° 57' -8° 12'N and longitude 100° 12' -100 35'E. The area is 22 kilometers wide and 135 kilometers long. The physiography of the area can be described as follow: The eastern part is characterized as." a coastal plain which consists of long stretches of sandy beach, broken only by major rivers, and followd by a series of parallel beach ridges. Between the beach barriers and the oldest series of beach ridges are the Lagoons. They are extremely shallow (2 meters in most places) and clearly undergoing rapid sedimentation, the western part is swamp. Sediments, are from the numerous short rivers that no longer have direct access to "' the sea .The area is planted with coconuts, sugar palm, fruit trees and rubber plantation is contrast with paddy cultivation of the back swamp., The climate is defined as northeast monsoon and southwest monsoon (see figure 1 : The study area)
Figure 1 : Location of the studyarea, TH4
4. Data Acquisition
4.1 Satellite data
Data Holdings
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The Airborne radarsat image, C-band, with was deployed by the CCRS convair 580 aircraft at an altitude of 6 kilometers. The observation date was November 5, 1993, HH and VV polarizations, right look direction.
- Landsat-5 TM of path 128 row 55, acquired on September 10, 1992 and February 20, 1994.
- ERS-l SAR C-band, VV polarization, acquired on October 11, 1993
- Spot 2 HRV of K 265, J 336, and K 265, J 335 (2 scenes) acquired on January 01, 1994 and September 03, 1993 respectively
Data required
- JERS-l OPS and SAR data acquired in November 1993.
4.2 Field Information
Ground information collection was carried out during radar pass on November 5, 1993. The data collected from field observation include various ground objects and also personal interview with local farmers.
4.3 Topographic maps
Topographic maps at a scale I :250,000 and I :50,000 which were reproduced by the Royal Thai Survey Department
4.4 Thematic maps
Soil suitability map and existing land use map will be used for supporting image analysis
4.5 Other related research reports
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