Comparison between Instagram Data and New Water Quality Index Showing the Level of Activity along the Rivers

Abstract

 To simply analyze the characteristic of new water quality index, which shows the level of activity along the rivers, Instagram data was used. Firstly, we grasped the relevance between the index and the observed number of river users. Secondly, rank weight of new index was estimated from relevance obtained. Finally, relation between estimated new index and Instagram data was verified. As a result, new index was related to the number of people playing in the water and at the waterside. “Putting face in the river easily” was four or five times worth than “playing in the river easily”, “impossible to enter the river but possible to approach the river” and “approaching the river difficulty”. In relation between posts including a word such as “fishing” and the new index, if the fish like “bass”, which can live in the bad quality water, is caught, the new index is lower. On the other hand, it is necessary to pay attention to the relation the posted point and investigation spot of the new index.