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105/11/29 14:00 成功大學地球科學系劉正千教授 演講
演講公告
張貼人：網站管理員 ╱ 公告日期：2016-11-25演 講 公 告
主講人：劉正千 教授
地點：中央大學科學一館S-325教室
摘要：
講題：A web-based public-domain platform of sea surface currents derived from geostationary ocean colour imagery
主講人：劉正千 教授
成功大學地球科學系
時間：11月29日（星期二）下午2點
地點：中央大學科學一館S-325教室
摘要：
Lifting up from a sun-synchronous orbit (several hundred kilometres) to a geosynchronous orbit (35,786 kilometres), successful launch and operation of geostationary ocean colour imager (GOCI) in 2010 has not just increased the temporal resolution from a few days to every one hour, but also enhanced the spatial resolution to 500m (Faure, Coste, and Kang 2008; Ryu et al. 2012), comparing to the widely used SeaWiFS, MODIS or MERIS data. With a clear mission statement of detecting, monitoring and predicting short term biophysical phenomena as well as noxious/toxic algal blooms of notable extension, GOCI provides an unprecedented set of ocean colour observations that produces an improved marine fisheries information to the fisherman communities and benefits coastal zone and resource management. Furthermore, the hourly changes of earth surface revealed by GOCI has also raised a lot of interests and opened a new gate to deriving sea surface currents (Yang et al. 2014; Sun et al. 2016). However, this application has been turned into an operational product. More possible applications of GOCI hourly data should have been exploited, but even the experienced users are impeded by tedious data downloading, decompressing and processing of huge amount of GOCI hourly data before they can actually see just one image. It is therefore still not possible for the general public to browse the most up-to-date and historical GOCI images of their regions of interest (ROI) at full-spatiotemporal-resolution from all kinds of devices. As a result, all available GOCI products so far are basically the same as the products of other sun-synchronous satellites, such as SeaWiFS, MODIS, MERIS, except for giving eight more choices of GOCI products from 9:00am to 3:00pm in one day.
Based on the experience attained and the technique developed for processing Formosat-2 (Liu 2006) and Landsat-8 imagery (Liu et al. 2016), this research is aimed at providing all GOCI hourly data in the format of browsable image tiles and the product of sea surface currents through a web-based public-domain platform, namely open access satellite image service of GOCI (OASIS-GOCI). With the capability of screening the entire archive, users are able to select their ROI, browse any GOCI hourly data at full-spatiotemporal-resolution, and identify the space and time slots that tend to produce more reliable surface currents. OASIS-GOCI facilitates the general public to explore more possible applications by displaying the GOCI hourly data in sequence of time. The sea surface current is also the first time-derived product that makes the advantages of geostationary observation. OASIS-GOCI provides a comprehensive archive of sea surface current that would benefit the related researches, such as the transportation of terrestrial materials in Taiwan Strait. Experience obtained from this work would also benefit the future satellite missions of ocean colour observation with the similar geostationary orbit, such as GOCI-II/KARI/KIOST, GISAT-1/ISRO, and GEO-CAPE/NASA.
最後修改時間：2016-11-25 AM 9:03
