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ISPRS Int. J. Geo-Inf. 2017, 6(3), 69; doi:10.3390/ijgi6030069

The Analysis of Task and Data Characteristic and the Collaborative Processing Method in Real-Time Visualization Pipeline of Urban 3DGIS

1
National Engineering Research Center for E-Learning, Central China Normal University, 152 Luoyu Road, Wuhan 430079, China
2
College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China
3
Office of Scientific Research and Development, Wuhan University, Wuhan 430072, China
4
Institute of Technology Innovation, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230038, China
*
Author to whom correspondence should be addressed.
Academic Editors: Zhao-Liang Li, Jose A. Sobrino, Chao Ren and Wolfgang Kainz
Received: 18 November 2016 / Revised: 23 February 2017 / Accepted: 24 February 2017 / Published: 2 March 2017
(This article belongs to the Special Issue Recent Advances in Geodesy & Its Applications)
View Full-Text   |   Download PDF [1789 KB, uploaded 2 March 2017]   |  

Abstract

Parallel processing in the real-time visualization of three-dimensional Geographic Information Systems (3DGIS) has tended to concentrate on algorithm levels in recent years, and most of the existing methods employ multiple threads in a Central Processing Unit (CPU) or kernel in a Graphics Processing Unit (GPU) to improve efficiency in the computation of the Level of Details (LODs) for three-dimensional (3D) Models and in the display of Digital Elevation Models (DEMs) and Digital Orthphoto Maps (DOMs). The systematic analysis of the task and data characteristics of parallelism in the real-time visualization of 3DGIS continues to fall behind the development of hardware. In this paper, the basic procedures of real-time visualization of urban 3DGIS are first reviewed, and then the real-time visualization pipeline is analyzed. Further, the pipeline is decomposed into different task stages based on the task order and the input-output dependency. Based on the analysis of task parallelism in different pipeline stages, the data parallelism characteristics in each task are summarized by studying the involved algorithms. Finally, this paper proposes a parallel co-processing mode and a collaborative strategy for real-time visualization of urban 3DGIS. It also provides a fundamental basis for developing parallel algorithms and strategies in 3DGIS. View Full-Text
Keywords: task parallelism; data parallelism; real-time visualization; 3D GIS; visualization pipeline task parallelism; data parallelism; real-time visualization; 3D GIS; visualization pipeline
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Zhou, D.; Jiang, G.; Yu, J.; Liu, L.; Li, W. The Analysis of Task and Data Characteristic and the Collaborative Processing Method in Real-Time Visualization Pipeline of Urban 3DGIS. ISPRS Int. J. Geo-Inf. 2017, 6, 69.

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