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Hydrological survey form
Help us record the current condition of Xinyi District's watercourses and your environmental observations.
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Layer guide
What each layer on the map shows and how to use it.
🕰️ Historical Maps
Historical maps from different periods, tracing changes in Xinyi District's hydrology:
- • 1904 Taiwan Baotu (cadastral survey) - A topographic map from the early Japanese colonial period, showing major watercourses such as the Liu-kong-tsun Canal.
- • 1921 Topographic Map - A survey from the mid-colonial period, by which time irrigation infrastructure had become more established.
- • 1939 Liu-kong-tsun Irrigation District Map - A detailed record of the Liu-kong-tsun Canal's irrigation area, showing the layout of its watercourses.
- • 1944 US Military Topographic Map - A wartime topographic survey recording the hydrological conditions of the time.
- • 1989 Topographic Map - Topography after modern urbanisation, by which point many watercourses had been culverted or rerouted.
Observations on hydrological change:
Comparing maps from different periods shows how Xinyi District's hydrological system gradually changed from natural waterways into a modern drainage network. Winding watercourses were straightened and many ponds were filled in, reflecting the profound impact of urbanisation on the hydrological environment.
🛰️ Satellite imagery
Live satellite imagery and environmental indices:
• Esri satellite imagery
High-resolution satellite imagery showing the actual landscape.
• Sentinel-2 true colour
The most recent true-colour satellite imagery, close to what the eye would see.
• Sentinel-2 vegetation index (NDVI)
Measures vegetation health and density. Colours correspond to:
• Sentinel-2 moisture index (MOISTURE-INDEX)
Measures moisture content in soil and vegetation. Colours correspond to:
🌳 Open data layers
Taipei City open data:
- • Street tree shade - Street tree canopy coverage (roadside trees only, not including parks)
- • Parks and woodland - Area-based green space such as parks, grassland and woodland, filling the gaps in the street tree dataset — including Xiangshan (Elephant Mountain) and the district's parks.
- • Pavement extent - Walkable pavement areas
- • Urban planning zones - Xinyi District's urban planning zones
🌡️ Temperature layer
A live temperature distribution map showing the urban heat island effect and temperature variation across Xinyi District.
🚶 Routes and stops
Four guided hydrology routes:
- • Route 1 - Liu-kong-tsun Canal
- • Route 2 - The Source of Xinyi
- • Route 3 - Wufenpu Branch Line
- • Route 4 - The Three Main Drains
信水義河: History and change
Xinyi District has a long hydrological history. From the early Liu-kong-tsun Canal to today's drainage systems, every watercourse bears witness to the city's growth.
The era of the 1904 Taiwan Baotu survey
At that time, the Xinyi area was largely paddy fields and ponds, with watercourses following their natural, winding paths.
The impact of modern urbanisation
As urban development progressed, many watercourses were covered over to become roads or underground drainage culverts.
Changelog
信水義河 Interactive Map · Version history
信水義河 Waters of Xinyi · NTU GIBP × Xinyi Community College