Satellite-Detected Flood Waters in Quezon Province, Philippines, November 2020

About 20 km² of land appears to be flooded in Calauag and Lopez municipalities, as detected by Sentinel-1 radar imagery from 12 November 2020. The United Nations Satellite Centre (UNOSAT) produced this preliminary analysis, which estimates about 8,300 people are potentially exposed to the flooded areas. The data is provided in SHP and GEODATABASE formats.

Use Cases

• Mapping flood extent based on satellite-detected surface waters.
• Estimating population exposure based on WorldPop data and detected waters.
• Conducting preliminary damage assessment for the analyzed area of about 260 km².

Strengths

• Provides a specific flood extent estimate of about 20 km².
• Includes a population exposure estimate of about 8,300 people.
• Based on a specific Sentinel-1 image acquisition on 12 November 2020 at 05:38 local time.

Limitations

• Analysis is preliminary and has not been validated in the field.
• Flood detection may underestimate standing water in built-up and densely vegetated areas.
• Column-level documentation is absent; field semantics must be inferred after download.

Provenance

Source

United Nations Satellite Centre (UNOSAT)

Collection Method

Satellite radar image analysis from Sentinel-1.

Time Range

12 November 2020

Freshness

Last updated 2026-06-14 10:51:07.139654; freshness should be verified.

Geography

Calauag and Lopez municipalities, Quezon Province, Bicol Region (Region V), Philippines