International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004
) 2 | 8 /
1999). The ESRI geo-database framework also provides a
foundation to implement versioning and multi-user access
support. The Invalidated-Area mechanism provides an efficient
and elegant way to detect changes to terrain measurements, and
enables local updating.
The Massachusetts example presented in this paper, and other in
house testing cases, have demonstrated the capability and
efficiency of the proposed approach. The approach may also
benefit the user who can now contract out for the source
measurement data and handle it in an efficient and flexible
manner for many applications, as opposed to contracting out a
GRID model that is limited.
There are, however, several tasks that still require further
research and development. These include 1) a better vertical
indexing mechanism for line and area features, 2) on-the-fly 3D
generalization of line and area features, and 3) “horizontal”
multi-resolution queries involving line and area features.
The current design and implementation of the system has
introduced some storage overhead in order to support tiling and
vertical indexing. Efforts are also needed in order to minimize
or eliminate the impact of this overhead.
REFERENCES
Floriani, D., “Multiresolution modeling in geographical
information systems”, Unpublished paper Presented at
GISRUK '95, University of Newcastle: Newcastle-upon-Tyne,
UK. (1995)
Gottshalk, H.J, "Die Generalisieerung von Isolinien als
Ergebnis der Generalisierung. von Flächen”, Zeitschrift für
Vermessungswesen, Vol. 97, No. 11, pp. 489-494. (1972)
Heller, M., “Triangulation Algorithms for Adaptive Terrain
Modeling”, proceedings of the Fourth International Symposium
on Spatial Data Handling, Zurich, Vol. 1, pp. 163-174. (1990)
Hoppe, H., “Smooth View-Dependent Lecel-of-Detail Control
and its Application to Terrain Rendering”, IEEE Visualization,
October 1998, pp. 35-42. (1998)
Johns, C.B. and Abraham, I.M., “Line Generalization in a
Global Cartographic Database”, Cartographica 24: pp. 32-45.
(1987)
Kalvin, A.D., “Superfaces: Polygonal Mesh Simplification with
Bounded Error”, IEEE Computer Graphics and Applications,
May 1996, pp. 64-77. (1996)
Kiduer, DVD. "Ware, JM, Sparkes AJ, Jones ‘CB.
"Multiscale Terrain and Topographic Modelling with the
Implicit TIN”, in Transactions in GIS (eds J.P. Wilson, A.S.
Fotheringham, P. Forer), Vol. 4, Issue 4, October 2000, pp. 379-
408. (2000)
Lee, R.W., "Who Says Can't Teach an Old New Tricks",
IMAGE Conference, Scottsdale, Arizona, August 2-7, 1998, 5p.
(1998)
Loon, J.C., "Cartographic Generalization of Digital Terrain
Models”, Doctoral dissertation, The Ohio State University. Ann
Arbor, Michigan: University Microfilms International, UMI 79-
02171. (1978)
286
Peng, W., "Database Generalization: Concepts, Problems, and
Operations”, proceedings of the XZX /SPRS Congress, July 16-
23, 2000, Amsterdam, The Netherlands, 8p. (2000)
Peng, W., *Automated Generalization in GIS", PAD Thesis,
Wageningen Agricultural University and ITC, The Netherlands,
188p. (1997)
Peng, W., Pilouk, M., Tempfli, K., “Generalizing Relief
Representation Using Digital Contours", proceedings of the
XVII ISPRS Congress, July 9-19, 1996, Vienna, Austria, 8p.
(1996)
Reinhard, K., *Multiresolution Representations for Surfaces
Meshes Based on the Vertex Decimation Method", Computer &
Graphics, Vol. 22, No. 1, pp. 13-26. (1998)
Weibel, R., “Models and Experiments for Adaptive Computer-
Assisted Terrain Generalization”, Cartography and Geographic
Information Systems, Vol. 19, No. 3, pp. 133-152. (1992)
Weibel, R., “Konzepte und Experiment eur Automatisierung der
Reliefgeneralisierung", Doctoral dissertation, Geo-Processing
Series, Vol. 15, Department of Geography, University of
Zurich. (1989)
Wolf, G.W., *Generalisierung topographischer Karten mottels
Oberflächengraphen”, Doctoral dissertation, Department of
Grography, University of Klagenfurt. (1988)
Wu, H, “Prinzip und Method der automatischen
Generalisierung der Reliefformen", Nachrichten aus dem
Karten-und Vermessungswesen, series I, Vol. 85, pp. 163-174.
(1981)
Yocli, P., "Entwurf einer Methodologie fur computergestütztes
kartographisches | Generalisieren topographischer Reliefs”,
Kartographisches Generalisieren, Swiss Society of Cartography
(ed.), (Cartographic Publication Series, Vol. 10, Zurich. (19903,
Zeiler, M., “Modeling Our World — The ESRI Guide to
Geodatabase Design”, ESR/ Press. (1999)
Zoraster, S., Davis, D., and Hugus, M., “Manual and Automated
Line Generalization and Feature Displacement", ETL-Report,
Vol. ETL-0359 (plus ETL-0359-1). Fort Belvoir, Virginia: U.S.
Army Corps of Engineers, Engineer Topographic Laboratory.
(1984)
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