Single ignition point positioning method based on SRTM 90m DEM

Abstract

The invention discloses a single ignition point positioning method based on an SRTM 90m DEM, and the method comprises the following steps: obtaining the elevation data of the SRTM 90m DEM, and carrying out the preprocessing of the elevation data; when the monitoring equipment monitors a theoretical fire point on a mountain peak, the holder stops rotating, the camera shoots a current picture, and a straight line where an optical axis is located at the current moment is projected to a geodetic coordinate system from a mechanical horizontal coordinate system; obtaining a straight line where the theoretical fire point and the monitoring point are located; adopting a bilinear interpolation method to obtain elevation data of each step length point on the straight line; acquiring the height value of each step point on a straight line where the theoretical fire point and the monitoring point are located in the geodetic coordinate system, and when the height value is smaller than or equal to the elevation data of the point, judging that the position of the fire point is an actual fire point position; and correcting the actual fire point position according to experience. According to the method disclosed by the invention, the positioning precision can be improved, the construction investment is reduced, the coverage rate of monitoring equipment is increased, and the confidential problem is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of fire point location, in particular to a single fire point location method based on SRTM 90m DEM. Background technique [0002] The resources in the forest are one of our important natural resources, which play an important role in the development of human life and society. It can protect biodiversity, maintain water and soil, and maintain the carbon balance in nature. Therefore, protecting forests from fires has great social benefits. At present, fire monitoring has been greatly improved by using a combination of civil air defense and technical defense in ground monitoring, but how to accurately determine the location of the fire in the later stage of the fire has become one of the technologies that need to be researched next. . At present, manual observation and positioning, two-point intersection positioning, laser ranging positioning, high-precision DEM data perspective analysis and positioning are m...

AI Technical Summary

Problems solved by technology

[0003] The artificial lookout observation method needs to be familiar with the terrain of the monitoring area. During the forest fire prevention period, it is necessary to bring wireless communication equipment, handheld GPS, compass and other equipment to observe the fire situation and determine the location of the fire situation. It can determine the horizontal position but cannot accurately determine the distance and depth.

The positioning accuracy of two-point intersection can be guaranteed, but it cannot be realized at the edge of the monitoring area, and at least two monitoring devices need to achieve overlapping coverage within the area. The premise of improving positioning accuracy is to reduce the coverage of equipment, resulting in big investment

Laser ranging and positioning will increase the cost of equipment and the short effective distance cannot meet the needs of long-distance positioning

Using high-precision DEM data can realize high-precision spatial perspective analysis and calculate the location of the fire point, but it cannot effectively avoid issues such as confidentiality

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