ISSN:0143-1161    

DOI:10.1080/01431169408954113

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

This paper gives a status overview of ERS-1 product generation at the United Kingdom's Earth Observation Data Centre (EODC) operated by the National Remote Sensing Centre Limited (NRSC). The current product range available to Principal Investigators (PIs) and other customers is reviewed, the forthcoming new products and other services are mentioned. A description of the images used in the cover illustration is included.

ISSN:0143-1161    

DOI:10.1080/01431169408954114

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

This paper presents an overview of the development of the Earth Observation Data Centre (EODC) and its facilities for processing and archiving ERS-1 data. The hardware systems of the EODC and the implementation of product processing chains are described. The paper concludes with a look at the achievements of the EODC and a discussion of the problems encountered with a view to the lessons learnt for future developments.

ISSN:0143-1161    

DOI:10.1080/01431169408954115

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The Earth Observation Centre (EODC), located at Farnborough, has been developed to serve the needs of users of data from Earth remote sensing missions, beginning with the European Space Agency's ERS-1 spacecraft. To this end, the facilities of the ESA Processing and Archiving Facility (PAF) for ERS-1 reside within the EODC. With the exception of the core Synthetic Aperture Radar processing algorithms, the majority of the scientific processing chains for exploitation of data from ERS-1 at the EODC were designed and specified by a Science Team, consisting of specialists from UK universities, industry, and government research institutes. These designs were implemented by an industrial consortium. The Science Team was supported by an Algorithm Development Facility (ADF) during the processing chain development. The Science Team currently provide operational support using the EODC Calibration and Validation Facility (CVF). This consists of the verification, calibration, validation, and continuous assessment of products. This paper describes the work and structure of the Science Team, the ADF and the CVF. The methodology adopted is evaluated, and implications for future projects of this kind are considered in the light of the lessons learned.

ISSN:0143-1161    

DOI:10.1080/01431169408954116

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The Earth Observation Data Centre (EODC) SAR processor has now been in operational use at the U.K. Processing and Archive Facility for over a year, generating well over a thousand high quality ERS-1 SAR images in support of the ERS-1 ground segment. In this paper we discuss the characteristics of the EODC SAR processor and the images that it generates.

ISSN:0143-1161    

DOI:10.1080/01431169408954117

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

This paper describes a ‘segmentation’ algorithm, which has been designed for Synthetic-Aperture Radar (SAR) sea-ice images as part of the U.K. Earth Observation Data Centre (EODC) Science Team activity. The segmented sea-ice product consists of distinct, statistically-homogeneous regions of ice and water from which various atttributes can be determined, such as area, centroid position, mean intensity and standard deviation, shape, orientation and texture. Such attributes are important in providing a template from which it is possible to derive information such as ice type, concentration and dynamics, the position of the ice edge, and the characteristics of leads and polynyas. Although the method has been developed for processing ERS-1 data, it is demonstrated in this work using both simulations and SAR sea-ice data obtained from the Seasat campaign of 1978, as ERS-1 data were not yet available at the t ime of implementation.

ISSN:0143-1161    

DOI:10.1080/01431169408954118

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Precise global measurements of sea surface temperature (SST) are of great importance for climate research and our ability to model the ocean/ atmosphere. The ATSR instrument is anAnnouncement of Opportunityexperimental package on the ERS-1 satellite, and it is designed to measure global SST with the accuracy levels (better than 0·5 K) that are required by modern climate models. The ATSR instrument's ability to meet its demanding performance objectives depends critically upon a number of novel design features. The way in which these features enable ATSR to achieve its measurement objectives are outlined, and the main tasks of the data processing scheme developed for the U.K. Earth Observation Data Centre are described, including in particular, the ways in which the telemetry data are decoded, the brightness temperature images are geolocated, and the scientific products are derived.

ISSN:0143-1161    

DOI:10.1080/01431169408954119

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The microwave radiometer on board ERS-1 developed at CRPE has two channels at 23·8 and 36·5 GHz. It is a nadir pointing sensor, aimed at the correction of the altimeter tropospheric path delay. It also provides the precipitable water and cloud liquid water over oceans along the satellite track. However, the measured brightness temperatures can be used to characterize polar ice and land surface properties. This paper summarises the characteristics of the instrument, describes the scientific requirements for data processing and presents its first results after launch.

ISSN:0143-1161    

DOI:10.1080/01431169408954120

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

This paper describes a system for processing microwave sounder data from the passive two channel ERS-1 Microwave Sounding Radiometer. The primary purpose of the instrument is to provide tropospheric data to correct the atmospheric path length of the ERS-1 altimeter. The system described here was implemented at the EODC to provide direct support to altimeter processing and is separate from that at the F-PAF. It produces three products including the total water vapour and liquid water product required for the correction in addition to quality reports. The areas given particular attention are those peculiar to the implementation at the EODC such as routine quality assessment, geolocation and the proposed sea ice edge product.

ISSN:0143-1161    

DOI:10.1080/01431169408954121

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

ERS-1 carries the fifth radar altimeter to be launched into Earth orbit. Although similar in concept and design to earlier altimeters, it is the first to include operation over non-ocean surfaces as one of its design requirements. The increased capabilities of the instrument allow for the generation of a variety of data products. The generation of these products calls for an extensive suite of software covering the processing of the raw data into basic ‘waveform products’, and the subsequent generation of higher level, geophysical products covering ocean, sea-ice, land-ice, land and lakes. This paper gives an overview of the ERS-1 altimeter data processing carried out at the U.K. Earth Observation Data Centre (EODC) at Farnborough. Besides processing the data from the satellite, a significant quantity of support data also have to be acquired and processed (e.g., improved orbit ephemerides, meteorological data, ionospheric data, etc.). The initial low-level processing of the raw data into the Waveform Foundation Product is common to all altimeter data products and is described in detail.

ISSN:0143-1161    

DOI:10.1080/01431169408954122

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor