Proceedings of the Symposium on Global and Environmental Monitoring: Proceedings of the Symposium on Global and Environmental Monitoring

Bibliographic data

Multivolume work

Persistent identifier:: 856665355

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts ; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856665355

Language:: English

Document type:: Multivolume work

Volume

Persistent identifier:: 856669164

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Scope:: XIV, 912 Seiten

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856669164

Illustration:: Illustrationen, Diagramme, Karten

Signature of the source:: ZS 312(28,7,1)

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [TP-3 OCEAN/COASTAL ZONE MONITORING]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: MONITORING THE OCEANS WITH SATELLITE ALTIMETRY TECHNIQUES. Demitris Delikaraoglou, Nicholas Christou and Mario Berube

Document type:: Multivolume work

Structure type:: Chapter

addition to observational capabilities from the polar platforms, the Eos program will be supplemented by moderate-cost Earth Probe missions, each of which will be characterized by a choice of orbit and spacecraft design capable of achieving a particular objective. CANADIAN PLANS FOR Eos Long-term Plans There are currently a number of research initiatives within various Canadian Government Departments aimed at addressing the role of satellite observations to give a better understanding of the Canada’s northern environment including the land and ice components, and the surrounding oceanic areas. Two major initiatives are particularly worth mentioning: (a) As an associate member of the European Space Agency, Canada is a contributor to the ERS-1 mission. Access to the ERS-1 data is a major reason for Canada’s participation in the ERS-1 program. National requirements for ERS-1 have been derived from a number of requirements based on the extension of remote sensing programs within various government departments (notably Canada Centre for Remote Sensing (CCRS), Canada Centre for Surveying (CCS) and the Geological Survey of Canada; Atmospheric Environment Service (AES); and Fisheries and Oceans), and interested industry and university groups. The national objectives represent four major areas: oceans, land resources, geology and ice, as well as specific scientific and application priorities. Overall, Canada’s highest priority is for regular guaranteed acquisition of SAR imagery, as well as ERS-1 Radar Altimeter, Scatterometer and Along Track Scanning Radiometer sensor data. Canada plans to operate two ground stations for acquisition of ERS-1 SAR image data, as well as global low bit rate data such as altimetry. These data and fast delivery products will be distributed to Canadian users using national data networks. (b) In a similar cooperative effort, an Eos interdisciplinary program for use of a Cryospheric System (CRYSYS) to monitor global change in Canada has recently completed its definition phase (McNutt et al., 1988). At the time of this writing, pending final NASA approval, CRYSYS will soon enter its ten year-long execution phase (Simard et al., 1990). There are several objectives for this work which follow from the preparatory work for ERS-1 and Canada’s own RADARSAT satellite programme; namely: • to continue to develop and implement algorithms necessary to extract geophysical information related to the cryosphere, to validate the results of regional models, and to use the regional information to initialize and validate polar models; • to maintain an extensive array of field sites in critical areas; • to access information from other related databases, especially in Canada, so that a complete record of information (including historical, operational and future products) on cryospheric processes can be obtained; and • • to use this information in models to examine the effects of global change as manifested in cryogenic processes, Figure 1 - Satellite Altimetry Mode Geometry and to deliver this information for use, via the Eos Data Information System (EosDIS), in the verification of global climate models. Current Developments in Satellite Altimetry Satellite altimetry is a technique that uses a microwave radar pulse sent from a satellite orbiting at a height of approximately 1000 km (cf. Figure 1). This pulse interacts with the sea surface and part of the incident radiation reflects back to the satellite. The two-way travel time of the pulse reflected from the ocean (or ice) surface is measured with great precision, the equivalent of a few centimeters (< 8 cm for the ERS-1 altimeter) in one-way path length. From these observations, near-surface wind and significant wave height can be determined from the power and the shape of the returned signal. The marine geoid is recovered by carefully editing the sea surface height data, and correcting for time dependent phenomena such as ocean currents, tides, and seasonal variations. In an inverse procedure, the latter can also be extracted and studied. Sea ice can be a problem when using satellite altimeter data to recover precise geoid and gravity field information. Nevertheless, special algorithms which utilize the altimeter signal’s scattering signatures can yield information about the presence of ice within the altimeter’s footprint, as well as infer the position of ice shelf edges, ice-sheet averaged surface gradients and thickness. During the ERS-1 mission, large portions of the arctic areas overflown by ERS-1 will be ice-free during late summer and early autumn. This means the Canadian experiments scheduled then will provide for the first time large amounts of much anticipated altimetry data in the near-polar regions. The altimetry measurements for oceanographic purposes, useful for monitoring time-variable oceanic events of interest to global environmental monitoring, pose quite stringent requirements. For instance, measurements of time-variable surface currents require observations with a 83

Access restriction

Copyright

fullscreen: Proceedings of the Symposium on Global and Environmental Monitoring (Part 1)

Multivolume work

Volume

Chapter

Chapter

Table of contents

Cite and reuse

Volume

Chapter

Image

Image fragment

Citation links

Citation recommendation