The Department of Survey is submitting to the Ministry of Natural Resources and Environment to consider and propose the correction of textbooks and documents according to new data.
On June 26th, Mr. Phan Duc Hieu, Director of Department of Survey, Mapping and Geographic Information Vietnam has announced that this department is completing procedures to sate the results of altitude measurement of Fansipan peak at Hoang Lien Son range. The highest position of Fansipan peak has reached 3,147.3 meters, which is 4.3-meter higher than the result measured by the French in 1909.
The Department has used GNSS technology, combined measurement with international coordinatesin India, Australia, and the Republic of Korea; and Dien Bien, Lao Cai and Hanoi measurement coordinatesin Vietnam. The measurement is carried out continuously in 24 hours, the data transferred will be processed and synthesized by modern technology to produce results.
“This is a modern measurement methodology bringing about the highest accuracy. The determination of the height of Fansipan is to preserve the position and markers. We are submitting to the Ministry of Natural Resources and Environment for consideration and recommendation to correct textbooks, documents according to new data,” Mr. Hieu reported.
The Director of Department of Survey, Mapping and Geographic Information Vietnam said, 110 years ago, the French measured the high of the Fansipan peak by Barometer method, using manometer placed at the mountain peak and mountain foot to measure pressure difference. productivity. From pressure difference values, they created mathematics model to calculate the height.
According to Mr. Hieu, the two reasons that could lead to the height changing of Fansipan peak in comparison to 110 years ago. First was the limitation of measurement technology, as a result, there were errors compared to modern measurement methods. In addition, the Hoang Lien Son range is a continuation of the Himalayas, this range is 2-3 cm higher year by year, so that the Fansipan peak can be higher.
In the coming time, the Department will repeatedly monitor to determine the specific cause of the difference in the height of Fansipan peak.
Fansipan is the highest mountain in Indochina, located between Lao Cai and Lai Chau provinces in the northwest of Vietnam, and about 9 km from Sa Pa town (Lao Cai).