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

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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:: [THP-2 GIS INTEGRATION]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: INFORMATION EXCHANGE VERSUS DATA TRANSLATION. Dr. Pamela Sallaway

Document type:: Multivolume work

Structure type:: Chapter

615 DATA TRANSLATORS Most translators work at the data format level. They usually convert points and lines. They less often convert matrices; may convert non-graphic attributes and seldom convert any interrelationship tables - except possibly a key linking features to non-graphic attributes. They do not convert models. To transfer a GIS construct, the lowest level of information is converted, and the accepting system is then used to produce the required construct. This is often ineffective. The raw data required to produce a construct in one system may not adequately meet the criteria of another system. For example, as computers tend to be precise, there is a common requirement for lines to meet exactly at intersections. The cost of this precision is very high. Therefore, most systems accept some degree of deviation. Using the above process, problems occur when the deviations tolerated by the source system differ from those allowed in the target system. The imported data may require additional interactive processing before the GIS construct can be produced. STANDARDS The idea of a standard format for GIS data is excellent. Then, each vendor could write a single translator to and from the standard, and communication issues would be easily resolved. The problem with the idea is that it lacks practicability. For example, regarding the three models for polygonal covers: how could a standard deal with the conversion of polygonal covers between models? One alternative would be to choose a single model and have vendors of systems using other models convert to it. The difficulty with this approach is that it is unlikely that originators of a standard could achieve vendor consensus as to the preferred standard model. The other solution is to have the standard provide the means for storing all models. There could be a standard means of: pointing to lines identifying boundary; associating left and right polygons with a line; storing a raster of pointers to polygons. While this would permit vendors to convert between their internal format and the standard format, it would not resolve the issue of data exchange. It would not provide an easy means of converting polygonal covers between systems using different models. As with translators, most standards address the problem at the Data Format level.

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