Mapping the Impacts of Typhoon Goni inAlbay
Geomatics for Environment and Development
MANILA OBSERVATORY
November 9, 2020

Summary• Low-lying municipalities (with elevation less than 10 meters
above sea level) were flooded due to rainfall exceeding 150
mm during the onslaught of Typhoon Goni.
• Buildings in different parts of the province were damaged. The
typhoon damaged a total of roughly 50,000 houses.

Low-lying Areas in Albay

Typhoon Goni (Nov. 1, 2020)

Low-lying municipalities:
LibonMalinaoBacacay
Legazpi City
Rapu-Rapu
Tabaco CityTiwiOas
Pio DuranManitoLigao City
Malilipot

SantoDomingo
Polangui
JovellarFlooded Areas in Albay (Nov. 1 and Nov. 5, 2020)

Typhoon Goni (Nov. 1, 2020)24-hour Total Rainfall
Global Precipitation Measurement (GPM)
31 Oct 8 PM – 1 Nov 8 PM
http://sharaku.eorc.jaxa.jp/GSMaP_NOW/index.htm• Highlighted in blue are the observed flooded areasin Albay after >150 mm of rain due to Typhoon
Goni on Nov. 1, 2020.
• Flood extent was detected by thresholding the difference ofpixel values of Sentinel-1 SAR image taken on Nov. 1, 2020and Oct. 2, 2020 in Google Earth Engine.
• Please note that flood extent could be underestimated inurban areas due to complex backscattering over built
surface.
• Note also that no ground validation was done for this map.

Flooded municipalities in Albay
Tiwi
Guinobatan
Pio Duran
Ligao City
Tabaco City
Bacacay
Jovellar•Camalig
Malinao
DaragaLegazpi CityOasMalilipot
PolanguiSAR – Synthetic Aperture Radar

Santo Domingo
ManitoLibon

Flooded Population in Albay

Typhoon Goni (Nov. 1, 2020)••

PSA – Philippine Statistics Authority
SAR – Synthetic Aperture RadarAffected Population in Albay as of Nov. 8, 2020

Typhoon Goni (Nov. 1, 2020)• NDRRMC reported that Goni affected atotal of 339,529 persons in Albay.
• Legazpi City, Tabaco City, Bacacay,Daraga, and Oas have the highest
number of affected population(>20,000 persons).
•NDRRMC – National Disaster Risk Reduction and Management Council

Damaged Buildings in Albay

Typhoon Goni (Nov. 1, 2020)• Highlighted in yellow are the location ofbuildings and in red the possible location ofbuilding damage due to inundation and strong
winds of Typhoon Goni.
• NDRRMC reported a total of 49,605 damaged
houses of which 8,289 were totally damaged
and 41,316 were partially damaged.
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•
•
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Building locations were from OSM.
Damaged areas were detected using synthetic aperture radar dataof Sentinel-1 of European Space Agency by ARIA-SG team of Earth
Observatory of Singapore (EOS) in collaboration with NASA-JPL andCaltech.
Please note that no ground validation was done for this data.
NDRRMC – National Disaster Risk Reduction Management CouncilOSM – Open Street Map
AI – Artificial IntelligenceNASA - National Aeronautics and Space Administration
JPL – Jet Propulsion Laboratory

Damaged Houses in Albay

Typhoon Goni (Nov. 1, 2020)• NDRRMC reported that Goni damageda total of 49,605 houses in Albay.
• Tabaco, Oas, Malilipot, and Santo
Domingo have the highest number ofdamaged houses (>3,000 houses).
•NDRRMC – National Disaster Risk Reduction and Management Council

Affected land cover in Albay

Typhoon Goni (Nov. 1, 2020)

Typhoon Goni (Nov. 1, 2020)

Typhoon Goni (Nov. 1, 2020)

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