How Johnson's County is recreating crime scenes with laser scanning

作者：Renata BarradasGutiérrez

如果一张图片说成千上万的话，请想象一下3D激光扫描如何在犯罪现场调查中找到真相。美国堪萨斯州的约翰逊县警长办公室使用Leica Geosystems激光扫描技术已有八年了。记者在HXGN Live 2018期间与约翰逊县警长办公室犯罪实验室的安德里亚·里德（Andrea Reed）联系，以了解Leica Geosystems的激光扫描解决方案如何将人们带回任何犯罪现场。

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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 torecreate crime scenes，因此人们在数字现实中回到了犯罪现场。我们使用Leica扫描仪确定空间关系，因为犯罪现场照片不允许我们真正显示项目与证据之间的空间关系。

In our agency, in Johnson County, Kansas, USA, we use laser scanning to document major crime scenes – whether it's a homicide, a suspicious death, officer-involved shootings, or any shooting scenes where we can do some reconstruction or use the ballistics rods.

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 createTruViewlinks, which allow people to step into the crime scene in a virtual way.

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Leica Geosystems 3D激光扫描仪和软件如何提供有关传统犯罪现场映射方法的法医工具？

Laser scanning takes out the human factor of any type of error。3D laser scanning goes above and beyond tape measures, protractors, and laser measuring devices and it's much more accurate and比传统方法更精确of 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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Leica Geosystems软件如何支持您的需求？

Traditional methods only permit us to create 2D diagrams. With Cyclone you can创建具有不同观点和平面图布局的3D模型。WithTruView Localpeople can actually step into a crime scene. TruView allow us to与Internet链接共享点云数据，以查看网站的虚拟和照片现实视图。There was a case where we used a fly-through that showed the defendant had the opportunity to exit through a doorway but instead continued ahead to commit a homicide. We were able to show through scan data the path this person took, passing by an exit.

在会议期间，我听说了Leica Geosystems事件映射软件，Leica Map360,我认为这将是extremely advantageous to us back at our laboratory and in our crime scene unit. I'm really excited to go back, and talk to my boss, and explain “this is what I think we should be using, here are the advantages to it, and this is how we can use it”, and just really step up our game.

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MAP360中引起您注意的功能是什么？

Map360 seemed like an射击事件重建的更轻松的工作流程我真的很喜欢你怎么能diagram out scenes by using the point cloudsyou collected and captured. The desktop software allows users to创建法院就绪文件and make an even more visual representation of a crime scene.

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您能提供一个示例，说明如何通过激光扫描捕获数据帮助约翰逊县警长办公室解决了案件？

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 morein depth look at the crime scene。它允许陪审团见人的地方standing based on what we were able to show through Cyclone, ultimately discrediting the self-defence claim.

The output of该软件可以帮助我们进行法庭展览。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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What have you learned at HxGN LIVE that will improve your work?

我参加了一次会议Leica Cyclone寄存器360。We didn't realise that we had it at our disposal and now that I know that we have REGISTER 360 as part of our licensing, we can provide a more useful workflow and additional output.

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在HXGN Live 2018上，您的主要收入是什么？

Knowing the technology is there and it is going to keep changing, making things better and improving our workflow.