Fengshan county undertakes the aerial photography project of 30km power line in Changdu_Other electronic measuring instruments_Electronic measuring instrument_Instruments and Apparatuses_Products

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Fengshan county undertakes the aerial photographing project of 30km power line in Changdu
Jiangda county is subordinate to Changdu City, Tibet province
It is located in the north of Tibet Autonomous Region and the northwest of Changdu city
The terrain of Jiangda County tilts from northwest to Southeast
It is the valley of Jinsha River Basin, with a minimum altitude of 2800m and a maximum altitude of 5436m
The average altitude is about 3800 meters, and the height difference is 2636 meters
A large area of forest grows in the southeast agricultural area at a lower altitude
It is an advantageous area for diversified agriculture, forestry and animal husbandry
It is in the east of China's snowy plateau and in the high mountains and valleys of Hengduan Mountains
The survey area has high altitude, high cold and hypoxia
The work is very difficult
First, the staff should not work in the field for a long time
Second, the terrain elevation difference is large, and the flight work is difficult
The total length of the survey area is 30 km, with a total of 1 sortie flown
The set course overlap is 85%, the side overlap is 60%, the image size is 7360 * 4912, 443 effective images and 8 image control points

This aerial photography uses pix4uav technology and regional network adjustment technology to automatically calibrate the image
The software automatically generates the accuracy report, which can quickly and correctly evaluate the quality of the results
It provides detailed and quantitative automatic space three, regional network adjustment and the accuracy of ground control points

Automatically generate orthophoto images, automatically mosaic and uniform color, and splice all data into a large image
The image results can be displayed by GIS and RS software
Provide Dom and DSM data
Field image control point for 2 days, aerial photography for 1 day, and indoor mapping for 1 day, totaling 4 days

In December 2017, Changsha Qunli surveying and Mapping Technology Co
, Ltd
undertook the topographic map aerial survey project of changdejin municipal engineering
Tianjin is located in the lower reaches of Lishui and the northern border of Hunan
It is a transition zone from the remaining vein of Wuling mountain to Dongting Lake Basin
The terrain takes Lishui as the natural boundary, the remaining vein of Wuling Mountain is on the southwest Bank of Lishui, and the Northeast bank is the edge of the plain in the middle and lower reaches of the Yangtze River, The whole terrain tilts from south to northeast
The surface difference is obvious
The survey area is mainly urban area, the survey area is expanded along the river, and the road crosses the survey area
The vegetation is mainly grass and trees on the Bank of the river
The survey area is about 0
25 square kilometers, with course overlap of 80%, side overlap of 60%, image size of 7360 * 4912 and 832 effective images

The voyage took one day of aerial photography, one day of aerial three-dimensional data collection, and three days of topographic mapping

Before the elevation survey, it is necessary to observe and select the location where the panorama of the elevation can be seen as much as possible
The assumed coordinate system and free station setting are adopted, and the angle orientation is set to zero in the north direction; After the station setting is completed, use the total station without prism to carry out step-by-step measurement: first, collect the data of each detail point on the facade, including the horizontal position feature points of details such as doors and windows, columns and eaves, the corresponding point number of detail points, the number of coincidence point pairs, and record in detail when sketching and take photos for reference in the office The vertical spacing between windows, the height of doors and windows and the height of buildings are obtained by total station prism free height difference measurement, and the field height difference is directly solved through addition and subtraction calculation on site; Correct the detailed point data on the elevation to the front elevation after the exhibition point of AutoCAD software (due to the free station setting, the detailed point data of the elevation is not the front elevation after the exhibition point of AutoCAD software): select two points on the same projection line as the axis of the elevation, and the distance between the two points is the largest as far as possible (the points at both ends of the building), and take one of them as the rotation base point, Use the orthogonal function to correct all points, and the axis coincides with the coordinate axis Y axis after correction; Referring to the elevation photos, the elevation is drawn according to the point number of the field sketch and the point number on the front elevation obtained in step 4
The vertical data is obtained according to the calculation results of the field height difference

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