EVO320 Lightweight Five Lens Oblique Camera

The EVO320 lightweight five-lens tilting camera features high integration, high precision and light weight, as detailed below：

• A large number of engineering examples verified that the cadastral survey and 1:500 topographic map and other high-precision measurement requirements
• With a weight of only 350g and a volume of only 105mm×105mm×80mm, it is the smallest and lightest five-lens on the market at present
• Automatic self-check and repair function of camera, no need for external software or keys to set, to avoid losing pieces
• Each camera is checked, calibrated and focused one by one
• Support image free control operation based on DJI high precision positioning
• Standard late data processing software, one-click to achieve photo filtering and other functions
• Developed through PSDK, it is perfectly compatible with DJI M300 and M210 series uav
• Innovative storage technology can realize the single memory card can be plugged, field work more fast and convenient

Table 1  Technical parameters Table

Name	Parameter	Name	Parameter
Weight	350g	Maximum overall dimension	105×105×80mm
Number of camera	5	Camera pixels	120 million
Camera format	APS-C	Sensor size	23.5×15.6mm
Pixel Size	3.9μm	Focal length	35mm/25mm
Minimum photo interval	0.6s	Operating environment temperature	-20℃ - +60℃
Shell material	Injection nylon	Data storage mode	Single card pluggable

 

2、Operational efficiency analysis

The M300 is equipped with EVO320 lightweight tilt photography with five lenses, and the operating efficiency is as follows:

Table 2  Work efficiency Table

Flight altitude	Flight speed	Course time	Course lamination rate	Lateral lamination rate	GSD	Operating area	Note
96m	11.9m/s	40min	80%	75%	1.5cm	0.44Km²	Precision requirements for farm house class I
192m	15m/s	37min	80%	75%	3cm	0.94km²	Farm house precision requirements of Class II
320m	15m/s	34min	80%	75%	5cm	1.42km²	Three kinds of precision requirements for farm buildings

3、Typical engineering applications

M300 UAV +EVO320 five-lens tilting camera can be used in a variety of different engineering cases, such as 1:500 topographic map survey, cadastral survey, earthwork mine survey, and real scene 3D GIS application.

a、1:500 topographic mapping and elevation mapping

Case 1: A 1:500 topographic map mapping and elevation mapping project for the beautiful rural construction in a mountain village in Fujian Province, covering an area of 0.3 square kilometers, with 1 aircraft for tilting photography flight, which met the accuracy requirement of 1:500 topographic map after acceptance by the owner.

FIG. 1  3d model of this project

FIG. 2  Results of 1:500 topographic map of this project

FIG. 3  Elevation measurement results of this project

Case 2: Surveying and mapping of digital topographic map of a natural village in Hainan Province, the construction planning project requires 1:500, with a total area of 183 mu, one tilting photographic flight operation, which, upon acceptance by the owner, meets the 1:500 topographic map accuracy requirement.

 

   FIG.4  3d model and 1:500 topographic map results of this project

b、Cadastral surveying and mapping

Fujian a county, a number of natural villages high precision cadastral mapping projects. Traditional manual measurement is time-consuming and laborious, the project cycle is long, the manual input is large, and the survey area houses are dense, so it is difficult to enter. The use of M300 UAV +EVO320 tilt photography five lenses, the average of each frame can complete 1 natural village cadastral precision tilt photography field acquisition, work efficiency is greatly improved, the final results meet the owner's accuracy requirements.

  

FIG.5  3d model of a village in this project

  

FIG.6  Collection process and final results of the project

 

Table 3 Error Calculation Table in this project (part)

No.	Detection point coordinates		Total station measurement		Coordinate error (m)		In the error⊿（m）
	x	y	x	y	⊿x	⊿y
1	518073.483	2761611.689	518073.483	2761611.689	0.000	0.000	0.000
2	518025.2401	2761628.872	518025.243	2761628.874	-0.003	-0.002	0.003
3	518150.2228	2761661.527	518150.222	2761661.524	0.001	0.003	0.003
4	518031.1913	2761633.008	518031.194	2761633.006	-0.003	0.002	0.003
5	518098.5078	2761619.996	518098.509	2761619.993	-0.001	0.003	0.004
6	518057.3311	2761559.722	518057.326	2761559.721	-0.005	-0.001	0.005
7	518040.2235	2761571.73	518040.224	2761571.737	0.000	-0.007	0.007
8	518063.9631	2761608.08	518063.957	2761608.084	0.006	-0.004	0.008
9	518220.6523	2761728.806	518220.644	2761728.805	0.008	0.001	0.008
10	518224.2341	2761716.849	518224.244	2761716.851	0.010	0.002	0.010

 

Table 4 Statistical table of error in this project 

Total number of detection points	s<5cm	5cm<s<10cm	s>10cm	Gross error
169	114	46	9	0
	67.49%	27.22%	5.33%	0.00%
Check the result：［⊿⊿］=∑⊿2=87.06，In the error:m=±SQRT(［⊿⊿］/2n)=±2.2，Maximum point position error：4.94 After inspection, the median error was ±2.2cm≤±5.0cm, and the maximum point position error was 4.94cm≥10.0cm, which met the accuracy requirements of second-level ground objects.

c、Surveying and mapping of river courses (highways)

A river course in Guangdong, river survey project.

FIG. 7 The ribbon route and the 3D model of this project

d、Earth mining survey

An open pit mine in Jiangxi province requires high precision earthwork calculation for construction management. The total area of the mining area is about 0.5 square kilometers, and the accuracy is required to be no less than 1:500. One frame of inclined photography operation is required to meet the accuracy requirements after acceptance by the owner.

FIG.8  Tilt 3D model of this project

  

FIG.9  Local details of the 3D model of this project

e、Application of real 3d GIS

Intelligent fire control construction project of a fire detachment in Shandong Province, covering the whole region of the administrative region and key petrochemical units. As the pilot model of intelligent fire fighting in the whole province, the precision of the model is required to be within 5cm, and the secondary development of GIS system is needed. The M300 uav is used for large-area tilt photography operations, which can collect nearly 10 square kilometers of area in a day.

 

FIG.10  3D model and final application of this project