Overlays on the map

Elevation (bluer means lower)

Colour-coded from the Geospatial Information Authority's 5m mesh elevation data. Musashi-Kosugi sits on lowland formed by the Tama River, and the area east of the station is noticeably lower. A difference of a few metres changes how water collects.

Note：Reference values from mesh data — not the exact elevation of any single point.

Sources： GSI elevation tiles

Meiji-era wetlands

Extracted by the Geospatial Information Authority from Meiji-era maps, showing rivers, wetlands, paddies and reed beds — areas considered closely related to soil liquefaction. The Kanto data comes from rapid survey maps of 1880–1886.

Places that are now housing or roads may have been water a century ago. GSI describes the data as useful for judging where reclaimed or filled land may have a high water table or loose ground.

Note：GSI notes that positional accuracy may be low, as the source maps predate modern geodetic control. Treat the boundaries as approximate.

Sources： GSI Meiji-era wetland data

Flood inundation forecast

Hazard map data published by MLIT, based on the largest rainfall considered possible — not the largest flood on record. For most rivers this exceeds a 1-in-1,000-year annual probability; for the Tama River it assumes 588mm over 48 hours.

Nakahara Ward is also exposed to the Tsurumi River system, not only the Tama. Distance from the Tama does not by itself mean safety.

Sources： MLIT Keihin River Office ／ Kawasaki City flood hazard map

Land use zoning

Zoning under the City Planning Act determines what may be built where. 127 zones around Musashi-Kosugi are shown, coloured by the conventional palette: green for low-rise housing, yellow for residential, red for commercial, blue for industrial.

Tap an area for its building coverage ratio and floor area ratio — the two figures that govern how large a building can be. You can see high-rise districts sitting directly alongside low-rise residential streets.

Note：This data is from FY2019. Zoning alone does not determine what can be built — height districts, fire prevention districts and district plans also apply. For any actual decision, check Kawasaki City's current city planning information.

Sources： MLIT National Land Numerical Information ／ Kawasaki City planning information

Building wind (simulated, for reference)

We ran a computational fluid dynamics (CFD) simulation of wind from 16 directions over the 3D building models of MLIT's PLATEAU, to see how much the wind strengthens at 1.5m above ground. Combined with the Japan Meteorological Agency's hourly wind records at Haneda (2016–2025), this gives an estimate of the wind for each month.

Colours follow the Wind Engineering Institute's assessment criteria, used in environmental assessments of building wind. Based on the mean wind speeds at 55% and 95% cumulative frequency, areas are graded A (residential level), B (low/mid-rise town level), C (mid/high-rise town level) and D (strong-wind level). Area A is left uncoloured. The criteria are meant for a whole year of wind; here they are also applied month by month to show seasonal differences.

A resident-participation field survey (2014–2016) recorded the strongest winds around City Tower Musashi-Kosugi. In the simulation, too, areas C and D cover about half of the ground within 100m of the tower over the year, far above the 1km-wide average of about 6%.

Note：These are simulated reference values, not measurements. Buildings are as of FY2022, so newer buildings, trees, walls and signs are not included. The ground is treated as flat and the resolution is 6m. Wind records from Haneda, about 11km away, are converted to upper-level wind, so gusts and local variations are not represented. As Haneda is on the coast, summer southerly sea breezes may be stronger in the data than they are inland at Musashi-Kosugi. Only the area within about 1km of the station is shown.

Sources： MLIT PLATEAU, Kawasaki (FY2022) ／ JMA historical weather data (Haneda) ／ Hongo et al., WEI wind environment criteria ／ Shirasawa et al., resident wind survey in Musashi-Kosugi

Traffic accidents

Accident locations from the National Police Agency's open data for the last three years, colour-coded by fatal and injury accidents. Overlaid on school routes or your daily commute, it highlights intersections worth extra care.

Sources： National Police Agency open data