Contents of technical work on flood supervision by remote sensing technology in Vietnam

Contents of technical work on flood supervision by remote sensing technology in Vietnam 

According to the Circular, the contents of the technical work on flood supervision by remote sensing technology in Vietnam

-  Preparation. 

-  Processing of remote sensing images. 

- Extraction of data on flood supervision from the national geographic database. 

- Extraction of information on floods. 

- Flood information edit. 

- Establishment of flood supervision maps. 

- Inspection and assessment of the reliability of flood supervision maps. 

- Development of reports on flood supervision. 

- Submission and delivery of products. 

Technical regulations on extraction of data on flood supervision from national geographic database 

According to the Circular, regulations on the extraction of data on flood supervision from the national geographic database by remote sensing technology are as follows: 

- National land borders and administrative boundaries. 

-  Headquarters of People’s Committees of provinces, districts, and communes. 

- National railways, expressways, highways, provincial roads, district roads, and airports. 

- Regional hydrological objects with an area larger than 15 mm2 according to the scale of the map to be established; line-shape objects with a length greater than 2 cm according to the scale of the map to be established. 

Extraction of information on floods by remote sensing technology 

Extraction of information on floods:

- Selection of image polarization in the following order of priority: HH, VH, HV, and VV. 

- Determination of radiation value threshold of water objects on images.  

- Separation of flooded areas. 

- Export of flood area boundaries to vector form. 

See more details in Circular No. 12/2023/TT-BTNMT, effective as of December 1, 2023. 

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