Effect of Units for Population Aggregation on Calculation Precision of Road Distance to Regional Facilities

Abstract

The purpose of this article is to analyze the effect of units for population aggregation on calculation precision of the road distances from the residents to the nearest regional facilities. To this end, the distances from the central point of municipality subdivision areas were compared with the average distances from the central points of basic unit blocks in Japanese Census weighted by population in Kanagawa Prefecture. The results show that the error increases in the western part where the road network is sparse and that the relative error is high if the distance is less than one kilometer.

Analysis on accessibility to urban facilities using the flexible distance attenuation function

“…Sanuki and Yoshikawa pointed out the need to differentiate between the model in which the users select the nearest facility, and the model where the probability of facility choice is distributed among facilities; the selected model will depend on the purpose of the study. Interestingly, it has been shown that the facility distribution map based on the model where the nearest facility is selected is very similar to the map of the actual facility distribution 13 …”

“…Interestingly, it has been shown that the facility distribution map based on the model where the nearest facility is selected is very similar to the map of the actual facility distribution. 13 Here, we assume that the effect of the facility nearest to the residential area is sufficiently large compared to other facilities and adopt the accessibility of the nearest facility as facility accessibility. The reason for this is that the study focuses on the facilities that are very important in daily life, such as daily convenience facilities.…”

Evaluation of the location potential of commercial facilities as a place of refuge: A case study on facilities providing food in the Kii Peninsula

“…In the mountainous area and the coastal area, the detour rate, represented by the ratio of straight distance to road distance, tends to be higher than in the plains. 10 Thus, there is a substantial need for these areas to evaluate accessibility by road distance, as it is closer to the actual situation despite being a more complex calculation than the conventionally used straight distance.…”

“…While these areas are anticipated to suffer Tokai, Tonankai, and Nankai Coast Earthquakes, they are also characterized by a coastal area, where tsunami damage is anticipated, as well as a mountainous area with an estimated long distance to places of refuge. In the mountainous area and the coastal area, the detour rate, represented by the ratio of straight distance to road distance, tends to be higher than in the plains . Thus, there is a substantial need for these areas to evaluate accessibility by road distance, as it is closer to the actual situation despite being a more complex calculation than the conventionally used straight distance.…”