To prepare the land and space master plan for the next fifteen years (2020-2035) for the Dazi District of Lhasa City, Tibet Autonomous Region, CW-15 participated in their surveying plan recently.
Due to the harsh climatic conditions at high altitudes, natural resources such as forestry, wetlands and waters are also extremely vulnerable. How can we sustainably obtain the gifts given by the land under our feet, instead of squeezing resources vigorously, has become the core of this master plan.
"The city is constantly changing, with new buildings, new roads... The planning must be made on the latest and clearest base map." said Tian Chao from the Institute of Aerial Survey and Remote Sensing.
The JOUAV CW-15 UAV followed the First Aerial Survey and Remote Sensing Institute of the Ministry of Natural Resources to Dazi District, Tibet, to obtain the 1:2000 scale digital orthophoto results with a resolution of 20 cm.
Scope of measurement area
The 1:2000 surveying and aerial photography of 120 square kilometers in Dazi District, Tibet. The surveying areas are distributed in valleys and rivers, and the actual flying area is more than 300 square kilometers.
Flight route planning
According to the actual situation, the survey area is divided into 18 small areas with different altitudes. The route design is basically along valleys and rivers. Due to the large mountainous terrain, the side overlap is greater than 50%, and the course overlap is greater than 75%.
Ground control points
The measurement area is a high-altitude area, and the mountains are high and deep, and it is difficult to measure the image control points. In order to reduce the difficulty of field measurement points, the image control points are arranged evenly along the measurement area, and are arranged in the easy-to-reach area. A total of 198 image control points and 42 inspection points were arranged in the survey area.
During operation, the JOUAV CW-15 UAV take-off at altitude of 4,500 meters, and flexibly flew through valleys with complex terrain.
The institute obtained DOM, DEM, DSM, DLG and other data results after completing aerial mission.