a brief introduction to the characteristics of the scene, scene photography purpose and effect analysis of the current scene of the problem in photography, digital photography and drawn alarm system, combined with the feasibility and couplets with the system need to be resolved problems and measures put forward his views, and lists the cause of the of the system in solving the investigation of several major problems. key words alarm survey photography device 1 introduction recent years, with the continuous development of science and technology, all kinds of s, particularly in high-tech household appliances production and people's lives increasing occurrence of accidents, ji investigators work to increase a certain amount of difficulty, yin ci investigation of the photography has become increasingly important. scene photography is evidence of a technology according to the law, now, with the rapid development of technology, most provinces of china forces the use of digital p hotography, digital photography over traditional methods of photography in the form of images and storage have changed the way the image does not change the true reliability, while the code as a new photography photography technology, its legal credibility questioned by some people at home and abroad, the question is based on the most fundamental process in digital photography with the participation of people . we can be the digital photography and the alarm system in conjunction with, the alarm system activated at the same time start the digital photography system, a certain time interval a set of image acquisition, the process of recording the initial , provided for the cause of the investigation evidence, so digital photography combined with the alarm system, a there in the broad application prospects. 2 scene photography purpose and role 2.1 characteristics of the scene to destroy evidence in itself destructive. biomass burning, explosion itself is a kind of damage, left the scene after the fighting is the destruction of a site. people to put out s, rescue materials, is easy to trace evidence of destruction of the water used in fighting, foam, dry powder, etc. extinguishing agent on-site with great destructive effect, eliminate the "residual " damaged goods when they really are, and personnel during fighting to as soon as possible, rescue personnel, evacuation supplies, be operated rescue the building, so that the scene objects the original state and traces the spread of , smoke traces of collapsed houses and the material traces of kindling has been some damage and other physical evidence. explosive, chemical products, extensive application of polymer composite materials, , burning increased participation in the complexity of the scene. scene of the there is often a result of multi-cause of the . such as electrical, spontaneous combustion , human, and lightning are likely to cause a , and sometimes the interaction of several reasons. is bou nd to cause a scene objects change the objective necessity. 2.2 scene photography scene photography is an essential cause of the investigation is an effective means of investigation, it is the record of the scene, showing traces of , a measure of fixed physical evidence, but also the scene of the picture, site , point, a comprehensive system which realistically reflected that people can be clear about the , and help investigators in the identification of causes, identified responsibility to determine the facts of the crime is highly persuasive. 2.3 purpose of the scene photography scene photography aimed at the scene through the photos reflect the position and orientation, revealed traces of occurrence and spread of "fixed" in the cause of the scene evidence and the investigation of the scene, analyze the causes and evidence of inspection, identification of fire reasons, provide a legal basis and accurate information on the evidence.
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