Pervious surfaces are expected to contribute to the air temperature reduction against an urban heat island phenomenon. In this study, we tried to extract the spatial continuity of pervious surface distributions on a basis of the area of pervious surfaces. The impervious surface distributions derived from detailed land cover data were applied to spatial autocorrelation analysis so as to extract the spatial continuity. In addition, the relationship between the extracted results and the meteorological observation data was discussed. It was obvious that nighttime air temperatures around spatially continuous pervious surfaces tended to be lower than those in a reference range when the area of the pervious surfaces was larger than 9 ha.

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 The GIS data of sewerage system are made by map digitization. The map digitization could utilize the drawings registers on pages effectively and make the GIS data at low cost. But the map digitization could not get higher precision than the original drawings registers, and the survey method of original drawings registers might be the low precision method that is out of the general standard of operation specifications for public surveys. Authors considered the high precision 3D data consistent with feature to be needed. Therefore, authors made the 3D coordinate values of feature, that were surveyed from the detail survey (map information level 250) utilized the control points produced from the 4th class control point survey, into the high precision 3D vector data using GIS. It was investigated the validity of positional precision surveyed from the detail survey and the control point survey through the discrepancy between the centers of manhole, one is the detail survey result, other one is the geometrically corrected drawings register. Further, it became possible the underground space such as the earth covering and slope of pipe to be grasped visually by using the 3D expression in GIS.

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 In the process of underground space development, enormous information is collected in each developing stage, such as investigation, plan, design and construction. It is important to properly feed back these information to design and construction in order to realize rational design and construction of an underground space. And more, these information also become basic data in a plane of structure management. However, it is almost impossible that it is controlled in the individual ability, since collected information quantity is too enormous.
 For the purpose of intuitively controlling and processing these enormous information, we devised the system for the data management by freely moving in virtual reality space. In this paper, the basic structure of the system constructed by adopting WEB 3D and RDBMS, is described, and the practicability is verified.

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 This paper describes a novel voice guidance system for understanding the situation of road infrastructures, such as bridges, road surface, etc combined with the high-performance mobile phone function and a big database system related to the road facilities maintenance in Yamaguchi prefectural government. The proposed system is possible to use as a real-time forecasting system by voice announcement about the damage state of road infrastructures for inspectors during daily patrol time. By applying the system to an actual road network in Yamaguchi prefecture area as a specific example, the results show that the system helps high effectively road infrastructure administrators not only to find the sign of early stage road facility damages but also to establish the rational maintenance strategies for deteriorating road infrastructures.

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