约翰逊县如何通过激光扫描来重现犯罪现场

Author:Renata BarradasGutiérrez

If a picture says thousand words, imagine how 3D laser scanning augments perception to find truth in a crime scene investigation. Johnson's County Sheriff Office in Kansas, USA, has been using Leica Geosystems laser scanning technology for eight years. Reporter caught up with Andrea Reed from Johnson's County Sheriff Office criminalistics laboratory during HxGN LIVE 2018 to learn how laser scanning solutions from Leica Geosystems is bringing people back to any crime scene.

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Capturing trusting evidence is critical. Could you please explain how laser scanning is used by Johnson's County to document and reconstruct scenes for public safety?

Laser scanning allows us to重现犯罪现场，因此人们在数字现实中回到了犯罪现场。我们使用Leica ScanStationto determine the spatial relationships, because crime scene photographs don't allow us to reallyshow the spatial relationship between items and evidence。

在美国堪萨斯州约翰逊县的代理机构中，我们使用激光扫描记录主要犯罪现场 - 无论是凶杀，可疑死亡，涉及军官枪击事件还是任何枪击场景杆。

Our crime scene investigators are proficient in using Leica ScanStations andLeica Cyclone 3Dpoint cloud post-processing office software. We can create different outputs, such as snapshots in Cyclone software and show different types of pictures from the scanned data. We can also createTruView链接，使人们能够以虚拟的方式进入犯罪现场。

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How does Leica Geosystems 3D laser scanners and software provide a forensic tool over traditional methods of crime scene mapping?

激光扫描取出任何类型错误的人为因素。3D激光扫描超越磁带测量，量角器和激光测量设备，并且更准确，并且more precise than traditional methodsof taking measurements by hand. And then when you go into what we can do with the data it far exceeds any other methods.

I always tell people, “You only have one time, one chance, to document and collect and preserve evidence at a crime scene. So why in the world would you not want to do it to the highest level of accuracy that you can?” And what better way than with a Leica Geosystems 3D laser scanner?

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How is Leica Geosystems software supporting your needs?

Traditional methods only permit us to create 2D diagrams. With Cyclone you cancreate 3D models with different perspectives and floor plan layouts。和TruView Localpeople can actually step into a crime scene. TruView allow us toshare point cloud data with an internet link to see a virtual and photo-realistic view of the sites。在某个案例中，我们使用了一次蝇头，表明被告有机会从门口退出，但继续向前犯下凶杀案。我们能够通过扫描数据显示该人通过出口的路径。

During the conference I've heard about the Leica Geosystems Incident Mapping Software,Leica Map360，我认为这对我们回到实验室和犯罪现场部门将非常有利。我真的很高兴回去和老板交谈，并解释说：“这是我认为我们应该使用的，这是它的优势，这就是我们可以使用它的方式”我们的游戏。

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What were the features in Map360 that caught your attention?

Map360 seemed like an更容易拍摄事件重建的工作流程我真的很喜欢你怎么能通过使用th图出场景e point cloudsyou collected and captured. The desktop software allows users tocreate court ready documents并使犯罪现场的视觉表现更加视觉表现。

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Could you provide an example on how data captured with laser scanning helped Johnson's County Sheriff Office to solve a case?

There is one case where we used the scan data beyond a floor plan and a layout of the scene. The District Attorney for the case said that the shooting reconstruction was key to the entire case. The defendant was stating they had acted in self-defence, however, using Cyclone we were able to show the different perspectives and use the trajectory cones, providing a more深入了解犯罪现场。它使陪审团可以根据我们能够通过旋风展示的东西来了解该人的位置，最终抹黑自卫主张。

The output ofthe software helps us to do court exhibits。We often have floor plan layouts in large-size poster boards to explain during our testimony about what kind of evidence was found and where. We can show on our 3D laser scanner output layout where everything was within the crime scene. This really helps to orientate the jury as to what we are talking about and where in the crime scene we are talking about.

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您在HXGN Live学到了什么，可以改善您的工作？

I took a session onLeica Cyclone REGISTER 360。我们没有意识到我们可以使用它，现在我知道我们已经有360册作为许可的一部分，我们可以提供更有用的工作流程和额外的输出。

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What is the major take away for you at HxGN LIVE 2018?

知道该技术存在，它将继续变化，使事情变得更好并改善我们的工作流程。