This paper gave a brief of basic principles of neural network, analyzed the BP algorithm applications in
the neural network, and introduced the BP algorithm machinery. Based on BP algorithm, takes Karst
rocky desertification in Du'an country of Guangxi province as example, proposed the neural network
Karst rocky desertification early warning model structure which can realize the rocky desertification
warning analysis, calculate the rocky desertification fatalness indexes, and expresses the rocky
desertification early warning levels in the thematic map. The result verifies the credibility and the
possibility of the early warning analysis model with BP algorithm.
Now most of distributed virtual geographic environments (DVGE) applications still adopt the centralized pattern, which
brings the network congestion or single point of failure to the side of center server. But the P2P technique takes away the
bottleneck in data transmission exists in traditional C/S model by virtue of its multilink self-adaptive mechanism of the
data transmission, which has a magnitude meaning for researches on the spatial data delivering in distributed virtual
geographic environment. As the spatial data has the characteristic of the massive volumes and client change the
interesting spatial area in virtual scene so frequently that the spatial application efficiency is sharply decreased, the
author brought forward a layered P2P architecture of the spatial data interoperation and flexible group mode in P2P
network. A mechanism of layered query of oriented suit (LQOS) and the self-adapted cache mode were introduced to
adjust the peer loading and the link numbers for the reliable data capture. In this way, we provide DVGE the rapid data
transmission speed among peers, the great data transmission reliability and the better user experience. A DVGE
prototype was developed and it proved the efficiency of this P2P DVGE framework. At last the futures of involved
techniques and methods are concluded.
Now most of the spatial information service applications still adopt the centralized pattern, which brings the network
congestion or single point of failure to the side of center server. But the P2P technique takes away the bottleneck in data
transmission exists in traditional C/S model by virtue of its multilink self-adaptive mechanism of the data transmission,
which has a magnitude meaning for researches on the spatial information service delivering. As the spatial data has the
characteristic of the massive volumes and client change the interesting spatial area so frequently that the spatial
application efficiency is sharply decreased, the author brought forward a layered P2P architecture of the spatial data
interoperation and flexible group mode in P2P network. A mechanism of the layered query queue of the oriented
association and the self-adapted cache mode were introduced to adjust the peer loading and the link numbers for the
reliable data capture. In this way, we can provide the each peer the rapid data transmission speed, the great data
transmission reliability and the better user experience. A prototype was developed and it proved the efficiency of this
P2P spatial information service framework. At last the futures of involved techniques and methods are concluded.
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