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

作者：Renata Barradas Gutiérrez

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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捕获信任证据至关重要。您能否解释一下约翰逊县如何使用激光扫描来记录和重建公共安全场景？

激光扫描使我们能够recreate crime scenes, so people step back into the crime scene in a digital reality. We use theLeica ScanStationto determine the spatial relationships, because crime scene photographs don't allow us to really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.

我们的犯罪现场调查人员精通使用Lica扫描仪和Leica Cyclone 3D点云后处理办公软件。我们可以创建不同的输出，例如旋风软件中的快照，并从扫描数据中显示不同类型的图片。我们也可以创建truviewlinks, 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比传统方法更精确手工进行测量。然后，当您进入我们可以使用数据时，它远远超过了任何其他方法。

我总是告诉人们：“您只有一次，一次机会在犯罪现场记录和收集和保存证据。那么，为什么在世界上您不想达到最高的准确性？”还有什么比使用Leica Geosystems 3D激光扫描仪更好的方法呢？

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Leica Geosystems软件如何支持您的需求？

传统方法仅允许我们创建2D图。有了旋风，你可以创建具有不同观点和平面图布局的3D模型。Withtruview本地人们实际上可以进入犯罪现场。truview允许我们与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, which I think would be 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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What were the features in Map360 that caught your attention?

MAP360似乎是一个easier workflow for shooting incident reconstructionand I really liked how you could使用点云来绘制场景您收集并捕获了。桌面软件允许用户创建法院就绪文件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？

在一种情况下，我们将扫描数据超出了平面图和场景的布局。该案的地方检察官说，枪击重建是整个案件的关键。被告说他们是自卫的，但是，使用旋风我们能够展示不同的观点并使用轨迹锥，从而提供了更多in depth look at the crime scene。It allowed the jury to see where the person was standing based on what we were able to show through Cyclone, ultimately discrediting the self-defence claim.

输出该软件可以帮助我们进行法庭展览。我们经常在大型海报板上有平面图布局，以解释我们发现了哪种证据以及在哪里。我们可以在3D激光扫描仪输出布局中显示，其中一切都在犯罪现场。这确实有助于将陪审团定为我们所谈论的内容以及我们在谈论的犯罪现场的何处。

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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.