POINT_STATION_02【SR_PS20_2】

1. Regarding railway line names:

Mainly in JR, what is generally used as a line name is the operation system name. This name is different from the line name of the railway data published in the National Land Numerical Information, which requires careful consideration when being deployed. For example, the Yamanote line in fact includes 30 stations forming a ring shape such as Tokyo station and Shinbashi station, however only stations from Shinagawa to Tabata are registered (see the figure below). Other stations are registered on other lines, for instance Kanda station on Chuo line, Akihabara station on Soubu line, Ueno station on Touhoku line, etc., which is difficult to understand for average users.

Therefore, we have prepared two datasets, one that retains the line name (POINT_STATION_01) and one without the line name (POINT_STATION_02), so that you can choose the one that best suits your purpose of use.

When deploying both station and railway section data, please use either of the following combinations:

“POINT_STATION_01” and “POLYLINE_RAILWAY_01”

or

“POINT_STATION_02” and “POLYLINE_RAILWAY_02”.

2. Regarding station’s polyline data:

Polyline station is the polyline of the station “platform” in the pre-processed data.

In some railway data published in National Land Numerical Information, multiple station polylines may be linked to a single station.

The figure below shows the polylines of Shinjuku station.

The PODB table processes such polyline data by joining the polylines and consolidating them into a single record.

POINT_STATION_01 【Stations in Japan (with line names)】has spatial information in the following units, and multiple station lines on the same line are combined into a single record.

・Institution Type
・Operation Company
・Railway Line Name

Polyline of Shinjuku Station on the Yamanote Line of East Japan Railway Company (JR East) in POINT_STATION_01.

POINT_STATION_02 【Japanese station (no line name)】has spatial information in the following units, and multiple station lines of the same operator are combined into one record.

・Institution Type
・Operation Company

Polylines at Shinjuku Station of East Japan Railway Company (JR East) in POINT_STATION_02

3. Regarding station’s point data:

Since National Land Numerical Information does not contain point data of stations, we processed a representative point for each station by using the center point of station’s polyline for convenience. Therefore, when multiple target polylines are possessed, an event may occur where there is no point on the platform indicated by the polyline. (Figure below)

The polyline at the right bottom of the figure is where the Keio line and the Toei Shinjuku line overlap, and the central point becomes that of the Toei Shinjuku line.　Since there are two polylines on the Keio line, the representative point is displayed at the midpoint between them, which is off the polyline.

In addition, for attributes of prefecture and city/town/village linked to station data, we do not have official information from open data. Therefore, they are determined by using the location information of station points created by truestar. Please note that these data may not match the information  published in some records.