A GIS-Based Analysis for Mapping the Distribution of Seaweed Cultivation Area in East Lombok Southern Coastal Waters

The analysis employed in geographic information systems is an analysis using GIS (Geographic Information Systems) software as in land mapping or the like. GIS-based analysis can provide information that the potential distribution of seaweed cultivation area owned by the local territory is assuredly propitious; and for that reason, it needs to be maintained wisely for the people welfare. The objectives of this study are to find out the distribution of the potential seaweed cultivation area and to obtain the database on the suitability of seaweed cultivation area in the south waters of East Lombok. This research employs survey approach since it utilizes the existing data for gaining the problem solution rather than hypothesis testing. The instruments deployed in the process of the research are some equipment such as ships, GPS, current kites, measuring signals, thermometer, geological compasses, stopwatch, secchi disk, basic diving equipment, salinometer, and a GIS-based analysis software. The data of the research are carefully collected through observation method, documentation, and experiments. The result of the study shows that the total area of 606.936 ha are classified into suitable category (S2) 47.27%, not suitable area (N) 46.37% and highly suitable area (S1) 6.36%.

Precise pointing knowledge for SCIAMACHY solar occultation measurements

We present a method to precisely determine the viewing direction for solar occultation instruments from scans over the solar disk. Basic idea is the fit of the maximum intensity during the scan, which corresponds to the center of the solar disk in the scanning direction. We apply this method to the solar occultation measurements of the satellite instrument SCIAMACHY, which scans the Sun in elevation direction. The achieved mean precision is 0.46 mdeg, which corresponds to an tangent height error of about 26 m for individual occultation sequences. The deviation of the derived elevation angle from the geolocation information given along with the product has a seasonal cycle with an amplitude of 2.26 mdeg, which is in tangent height an amplitude of about 127 m. The mean elevation angle offset is −4.41 mdeg (249 m). SCIAMACHY's sun follower device controls the azimuth viewing direction during the occultation measurements. The derived mean azimuth direction has an standard error of 0.65 mdeg, which is about 36 m in horizontal direction at the tangent point. We observe also a seasonal cycle of the azimuth mispointing with an amplitude of 2.3 mdeg, which is slightly increasing with time. The almost constant mean offset is 88 mdeg, which is about 5.0 km horizontal offset at the tangent point.

Precise pointing knowledge for SCIAMACHY solar occultation measurements

We present a method to precisely determine the viewing direction for solar occultation instruments from scans over the solar disk . Basic idea is the fit of the maximum intensity during the scan, which corresponds to the center of the solar disk in the scanning direction. We apply this method to the solar occultation measurements of the satellite instrument SCIAMACHY, which scans the sun in elevation direction. The achieved precision is in most case below 0.6 mdeg, which corresponds to an tangent height error of about 34 m for individual occultation sequences. The deviation of the derived elevation angle from the geolocation information given along with the product has a seasonal cycle with an amplitude of 2.02 mdeg, which is in tangent height an amplitude of about 114 m. The mean elevation angle offset is −4.7 mdeg (266 m). SCIAMACHY's sun follower device controls the azimuth viewing direction during the occultation measurements. The mean azimuth direction has an error of about 1.5 mdeg, which is about 84 m in horizontal direction at the tangent point. We observe also a seasonal cycle of the azimuth mispointing with an amplitude of 2.4 mdeg, which is slightly increasing with time. The almost constant mean offset is 88 mdeg, which is about 5.0 km horizontal offset at the tangent point.