HDI circuit board is a circuit board with high circuit distribution density using micro-blind and buried via technology.The HDI board is divided into inner layer circuit and outer layer circuit, and the internal connection of each layer circuit is realized by drilling and metallization.
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The two-tier management system based on family contract management and unified integration is the basic rural management system in China and the cornerstone of the party's rural policy. Due to the limitation of special historical conditions, most local land contracting has problems such as unrealistic land, unclear and unqualified land, which leads to many disputes and disputes. In 2013, the Central Document No. 1 "Notice on Determining the Pilot Area for the Registration of the National Rural Land Contracting Management Rights in 2013" clearly stated that "the rural land contracting management right registration and certification work will be basically completed in five years, and the contracted land for farmers will be properly solved. The block area is not accurate, and the four are unclear."
In order to ensure the smooth implementation of the registration and certification of rural land contractual management rights, it is necessary to do a good job in cadastral investigation and to ascertain the ownership, boundary, area and utilization of rural land. It must have detailed, true, accurate and current measurement. means. UAV aerial survey has been perfected with the development of science and technology, especially the development and improvement of IMU/DGPS system (Digital Differential GPS (DGPS), Inertial Measurement Unit (IMU)), flight control and other technologies. Photography can obtain high-precision photo center point coordinates (POS data), so that UAV aerial survey provides high-precision images for rural land contract management rights confirmation, making UAV aerial survey become in line with rural land contractual management rights. One of the technical means of determining power. The drone has the characteristics of maneuverability, high efficiency, fastness, accuracy, low operating cost, wide application range and short production cycle. It has obvious advantages in high-speed image acquisition in small areas and difficult areas.
1) Measured method
It is a method of acquiring or solving the coordinates of boundary points in the field by using instruments such as GNSS receivers and total stations.
In practice, the image map used in the second national land survey is generally used as the working base map. The field implementation requires a large number of field surveying and mapping personnel, and the cost is high, and the specific implementation will be greatly affected by the topography and climate. In the ownership survey stage, the basemap resolution is low, and the check effect after the vector image is set is poor. The problem of the block misclassification is prominent, and the effect is poor in the publicity process.
2) Graphic method
It is based on the measured large-scale aerospace digital orthophoto, cadastral map or topographic map, and the method of obtaining the coordinates of the boundary points by graphical calculation.
Due to the influence of factors such as the resolution, coverage and current situation of aerospace digital orthophotos, cadastral maps and topographic maps, there are fewer resources that meet the requirements for the determination of rural land contractual management rights, and the existing data are in rural areas. The utilization rate of land contractual management rights is low, and it is difficult to meet the regulatory requirements.
3) Aerial survey method
It is a method of collecting the coordinates of boundary points by aerial photogrammetry.
Compared with the other two measurement methods, it has great advantages, such as low cost, convenient execution, high automation, high accuracy, and high image point accuracy and base image resolution. Therefore, it is more feasible to use UAV aerial photography to obtain high-resolution image data in the registration and certification of rural land contractual management rights. Through field image control measurement, air three encryption, orthophoto production, internal vectorization can obtain the coordinates, shape, area and other plot information of each piece of land in the work area, reducing the workload of field work input.
4) Combination method
It is based on one of the above measurement methods, supplemented by other methods to supplement the investigation to determine the coordinates of the boundary points.
1) Maneuverable and flexible
UAV aerial photography is suitable for low-altitude flights, flight approval procedures are simple and easy to operate, and are less affected by weather factors. UAV aerial photography does not require airport take-off and landing, and has low requirements for landing and landing sites. It is suitable for urban and village mapping and can quickly reach the survey area. For alpine hilly areas where the distribution of land is relatively scattered, the cost of the field staff can be greatly reduced.
2) High efficiency
UAV aerial photography is not affected by the terrain, and can be captured in various complex areas. Whether it is forest land, plateau, basin or water area, photography can be carried out, the data is comprehensive and accurate, the effective shooting time is long, and the work efficiency is high.
3) High accuracy of results
The image base map obtained by the aerial photography of the drone has high plane position accuracy, and the error in the position is better than the aerial survey specification. The image resolution can be optimized according to the precision and scale required by the survey rules of the rural land contract management rights. Tian Hao has a clear location, distinctive features, and high efficiency in interpreting.
4) High recognition
Real-time, high-resolution, true-color full-digital orthophoto images obtained by UAV aerial photography are used as working maps. The outlines of plots and fields are clearly identifiable, and the contractor can quickly judge the image texture and basic orientation. The location information can quickly find the location of the parcel. When the parcel is confirmed, the indoor efficient parcel identification can be realized. Combined with the aerial survey internal vectorization interpretation vectorization, the coordinate, contour and area information of the contracted parcel can be directly extracted, thereby improving the position. Confirm the efficiency and quality of work.
The "Regulations on the Investigation of Rural Land Contract Management Rights" (NY/T2537-2014) stipulates that the registration and certification of rural land contractual management rights must produce a base map for the determination of the ownership of rural collective land from 1:500 to 1:5000. The error of the DOM feature point relative to the point of the same name in the field shall not exceed the requirements of Table 1:
Table 1: Aerial Positioning Accuracy Index of Aerial Survey Image Results 
Therefore, the higher the application of HDI technology, the higher the manufacturing level of the laminate. Ordinary HDI boards are laminated once, and high-end HDI uses two, three or more lamination processes, as well as electroplating fill holes, stack holes, laser direct drilling, etc.
Application of UAV in the Registration and Certification of Rural Land Contract Management Rights
The rural land contractual management right refers to the right to possess, use and benefit the collectively owned or privately owned rural land owned by the peasants collectively owned by the members of the rural collective economic organization or the units or individuals outside the rural collective economic organization.
Means of mapping and plotting land rights in rural areas
UAV aerial photography and traditional measurement methods
UAV aerial photography accuracy requirements
UAV aerial photography technology application examples