Development of a landslide risk area display system by using the geospatial technology with daily rainfall data via the internet network in the Northern region of Thailand

Abstract

The results showed that the areas with the lowest landslide risk were 50,813.832 square kilometers (sq. km) (54.236 %). The moderate landslide risk areas of ​​20,924.511 sq. km (22.334 %) are located in Chiang Mai, Chiang Rai, and Mae Hong Son provinces. The most high-risk area was 21,952 sq. km (23.431 %) in the districts of Chiang Dao, Chai Prakan and Wiang Haeng in Chiang Mai. The risk areas of Nan province are shown in the districts of Chaloem Phra Kiat and Chiang Klang. The risk areas of Chiang Rai province are in the district of Mae Fah Luang, Mae Chan and Mae Suai. The risk area of Uttaradit Province is located in the district of Nam Pat. The risk areas of Phrae province are located in the Muang District. The risk area of Lampang province is located in the Wang Nuea District. The risk areas of Mae Hong Son province are located in the district of Pai and Mae Sariang. The high to the highest landslide risk areas are located in Nan province with the areas of 3,415.30 sq. km (29.77 %). Phayao province has 1,475.32 sq. km (23.29 %). Lampang province has 1,821.13 sq. km (14.53 %). Lamphun Province has covered 937.98 sq. km (20.82 %). Uttaradit province has covered 2,522.97 sq. km (32.19 %). Chiang Rai province has covered 3,917.91 sq. km or (33.55 %).  Chiang Mai province has covered 4,958.91 Sq.Km. (24.66 %). Phrae province has covered 1,912.30 sq. km (29.25 %). Mae Hong Son province has covered 990.84 sq. km (7.81 %). The visualization of landslide risk areas has multiple accessed the channels via mobile phone and computer via with internet network https://landslide.gis-cdn.net/. It showed the distribution of water with the cumulative rain for 6 different tones with less than or equal to 5, 5-20, 20-35, 35-60, 60-90, and more than 90 millimeters per day in the province, district, and sub-district levels