Investigation into Historical Change of River Basin Assisted by Integrated Spatial Information System

在大阪工业大学所在的宜户河下游，研究人员试图利用基于地理信息系统和CAD/CG系统的集成空间信息系统来考察大阪大都市区自然环境和社会环境的历史变迁。他们还试图想象未来的Yodo河流域。具体地说，他们用这个系统可视化了从江户时代到现在的城市景观、桥梁逃生和Yodo河的航道的变化。他们还阐明了Yodo对工业活动的影响和因素。首席调查员Yoshikawa开发了一个系统，从在当前地图上进行几何校正的历史地图生成3D城市模型。然后，他将大阪在元老时代的典型城市景观和桥下逃生还原为3D-CG模型。尤其是他保存了中野岛周围的逃生遗迹，作为数字档案馆，传承了优良的历史环境。天马桥、天津桥、纳尼瓦桥、小井桥、大河桥、约多亚桥的CG模型是在每个时代都产生的，并以过渡的方式可视化。他还选择了平方-Stage，其中保留了江户的品味，并生成了目前的CG模型作为第一步。现在，他正准备通过互联网向公众开放这些数据。调查员阿亚利用De Rijke在明治时代早期发布的勘测图纸恢复了Yodo的河流环境。他收集了现代测量技术建立后发布的测量图和地形图，并澄清了河流的变化。另一位调查者岩崎阐明了水运系统和港口分布的历史变化，这些变化帮助了Yodo上的工业。并对目前作为城市游憩空间的河流保留地进行了调研，明确了改进任务。

In the lower reaches of the Yodo River where Osaka Institute of Technology is located on, the investigators tried to examine the historical changes of the natural environment and the social environment of Osaka metropolitan area by using the Integrated Spatial Information System based on GIS and CAD/CG system. And they tried to image the future Yodo River Basin, too. Concretely, they visualized changes of the cityscapes, bridgescapes, and the course of the Yodo River from Edo period up to the present with this system. Also, they clarified the effects and factors of the Yodo on industrial activities.The head investigator, Yoshikawa developed the system generating 3D urban models from the historical map corrected geometrically on the present map. Then he restored the typical cityscapes and bridgescapes of Osaka in Genroku era as 3D-CG models. Especially he preserved the bridegescapes around Nakanoshima for the inheritable excellent historical environment as the digital archives. The CG models of bridges, Tenma, Tenjin, Naniwa, Kohrai, Ohe, and Yodoya, were generated in every era, and visualized transitionally. He also selected Hirakata-stage where; the Edo taste is left in, and generated the present CG models as the first step. Now he is preparing to open these data to the public through the Internet.The investigator, Aya restored the river environment of the Yodo by using De Rijke's survey drawings issued in early years of Meiji era. He collected survey drawings and topographical maps issued after the modem survey techniques had been established, and clarified the river changes. Another investigator, Iwasaki clarified the historical changes of the water transportation system and the ports distribution assisting the industries on the Yodo. And he investigated the river reservations as the urban recreation space at present, and clarified the improvement tasks.