Visualization of Road Slope Aspect for Fixed Property Appraisal of Lands Using Dem

In order to estimate proper current land price, various factors such as environment, communication, regulation of land use and so on are established by local government. Road slope is one of the land price factors for land form, and land price is corrected by road slope aspect based on road slope for the north. For example, road slope aspect is corrected so that land price face to northern slope road is able to become cheaper, or land price face to south slope road is able to become higher. Therefore, road slope aspect correction is one of important factors for local government where locate undulate area. However, the road slope aspect is appraised by primitive method with great time and labor, such as using contour map or field investigation using surveyor’s level.On the other hand, airborne laser surveying has been receiving more attention as a useful tool for real-time 3D data acquisition, and many applications such as city modeling, DTM generation, monitoring electrical power lines and detection of forest areas were proposed. Therefore, it is expected that DEM which is generated by airborne laser surveying is enormously contribute to generate road slope map so that land price estimation can be performed effectively.With these motives, generation of road slope map and visualization of road slope aspect for fixed assets appraisal of lands using DEM were investigated in this paper. 1. INTORODUCTION Japanese local government tax the fixed property tax based on appraisal of Real-estate such as lands, houses, depreciable properties. Appraisal of Real-estate is performed every three years, and investigation of streets for appraisal of land is performed since the property values of land are appraised by street value (Fixed property tax study group, 2007). On the other hands, Investigation of streets for appraisal of land consists of various factors (Reserch Center for Property Assessment System, 1997) such as environmental conditions (residential density, store density), traffic conditions (accessibility of station, accessibility of public facilities), street conditions (width of road, paved of road condition), and regulation by statute (use district, ratio of building volume). Here, correction of road slope aspects is one of the appraisal of land factors in the street conditions (Reserch Center for Property Assessment System, 2005). For example, road slope aspect is corrected so that land price face to northern slope road is able to become cheaper, or land price face to south slope road is able to become higher from the viewpoint of sunshine. Therefore, road slope aspect correction is one of important factors for local government where locate undulate area. However, the road slope aspect is appraised by primitive method with great time and labor, such as using contour map or field investigation using surveyor’s level. In these circumstances, it is expected that DEM is enormously contribute to generate road slope map so that appraisal of land can be performed effectively. This paper describes generation of road slope map and visualization of road slope aspect for fixed property appraisal of lands using DEM. 2. DATA AQUISITION 2.1 Case study area In order to generate of road slope map for fixed property appraisal of lands, residential area of Tokyo metropolitan region including flat and slope area was selected as case study area in this paper. The residential area is 2km in East-West and 1.5km in north. Figure 1 shows the aerial photograph of case study area. Figure 1. Case study area (Aerial photograph)