L A N T A W

initialising…
Building Marikina City block by block along its river, then draping real UP NOAH flood-hazard data over 36,795 rooftops - Metro Manila's most flood-prone city.
Experimental · Urban scale
Exploratory model - not an official hazard map. Flood layers are legacy DOST–UP DREAM / Phil-LiDAR 1 products published around 2017 and do not reflect later construction or flood-control works. Building heights are model estimates, not surveys. This shows hazard, not risk, and is not accurate for any individual building - verify with your LGU and current official maps before any decision.
LANTAW · URBAN

Marikina

The river city hit hardest by Typhoon Ondoy - every building along the Marikina River corridor, coloured by real flood-hazard data.

Flood return period
100-yr flood = ~1% chance each year (not “once a century”)
Time of day
Building height ×1.0
Flood depth (Phil-LiDAR)
High > 1.5 m
Medium 0.5–1.5 m
Low < 0.5 m
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Legacy Phil-LiDAR 1 hazard model · published c. 2017 · excludes later works
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About this scene

A block-scale experiment: every building footprint in a ~2.6 × 5.5 km window along the Marikina River, extruded in 3D and coloured by whether it floods.
Flood hazard - UP NOAH / DOST Phil-LiDAR 1 flood-hazard maps (10 m), served live from the DREAM LiPAD GeoServer as WMS tiles. 5 / 25 / 100-year return periods.
Buildings - 36,795 OpenStreetMap footprints, extruded with height estimates from Google Open Buildings 2.5D (Temporal, 2023; effective resolution ~4 m). 97% receive a model-estimated height (median ~5.5 m, capped near 90 m); the remainder use a footprint-size fallback. Google notes alignment drift, tiling artifacts and potentially larger height errors in the Global South.
Imagery - Esri World Imagery. Ground is flattened to the valley floor (30 m SRTM is too coarse under a dense city).
Story - On 26 September 2009, Tropical Storm Ondoy (international name Ketsana) dropped 455 mm of rain on Metro Manila in 24 hours - a PAGASA record - and sent the Marikina River over its banks. Almost the entire city went under, floodwater up to 10 feet deep in places; Provident Village, Tumana, Nangka and Malanday were hit hardest, and Marikina recorded 78 deaths, the highest of any Metro Manila city, out of 465 across the capital. The 100-year layer shows why: in this window, 92% of buildings sit in the floodplain - even the 5-year layer floods 78%.
Data: © OpenStreetMap contributors (ODbL) · Google Open Buildings 2.5D (CC BY 4.0 / ODbL) · Includes Copyrighted Material of Phil-LiDAR Program & DREAM, All Rights Reserved · Esri, Maxar. Prototype - not for operational use.
Flood: DOST–UP DREAM · Phil-LiDAR 1 (LiPAD), All Rights Reserved · Buildings: © OpenStreetMap contributors · Estimated heights: Google Open Buildings 2.5D · Imagery: Esri World Imagery