Freeze it while it’s hot!

Forensic photographer, and crime and fire scene visualisation expert, Jason Mellström shares his passion for the unique technical and procedural challenges of fire scene investigations.

出生在一个家庭的摄影师,杰森Mellström has a passion for the perfect image in his DNA. “But normal photography quickly hits its limits on a crime or fire scene because everything is black. So how do you get a meaningful image?” That’s the question that Jason was asking at the National Forensics Centre in Sweden when he began contributing to the development of 3D technology for forensic documentation.

Jason Mellström, Business Developmen Manager Public Safety Nordics - Leica Geosystems

“When I first got my hands on the Leica RT360 technology package, it reminded me of getting my first EOS digital camera and Photoshop; a whole new world opened to me. Suddenly I could work seamlessly and tell visual stories in completely new ways. The RT360 laser scanner is a similar thrilling discovery. It allows you to combine point cloud data and photographic images and other data to visualise and reconstruct the stories of fires or explosions and then share them with stakeholders in a seamless workflow” explains Jason.

碳线索

“In fire and explosion investigations we have a variety of clues. For example, which side of a doorpost is burnt darker? That tells you which direction the fire was going. Or what color is the melted metal? That tells you the fire temperature. There are also phenomena like heat shielding or debris patterns that contain important information. During fires you often get things collapsing and during explosions there are a lot of scattered parts. Often these objects are blocking access to crucial evidence that the investigator needs to examine. And they are carbonized, meaning they break when you touch or tread on them. That is why you need to be very careful in the way you approach the scene.” explains the veteran investigator.

Leica Geosystems RTC360激光扫描仪在火灾调查中

“To secure the vulnerable evidence, you need to freeze the location as soon as possible after the fire – while it is still ‘hot’. The goal is to preserve the scene as accurately as possible during the first walk-through in a Forensic Digital Twin. This is a 3D real-time virtual representation of a physical location. Once you have captured the scene data in this way, you can start shifting things to see what’s behind or underneath. Leica Geosystems’ fire investigation solutions are a response to all these challenges,” says Jason Mellström with conviction.

无妥协的综合数据

首先，使用RTC360，您可以快速工作而无需妥协解决方案。您可以通过高质量的3D扫描来记录和可视化位置at a每秒最高200万点。That allows you to capture3Dcolor在不到2分钟内的点云。其次，它是全面的：视野是一个慷慨的360°水平and300° verticalfield and you can attach additional information like images, text or geodata to the scans. Thirdly, you don’t have to worry about the light: you can scan in pitch darkness and still get accurate results as the RTC360’s Class 1 laser works with 1550 nm light that is invisible to the human eye.

For field operations, a light, compact and robust system are also very important factors. The RTC60 is IP54 rated for dust and water protection and can be paired with a dedicated lightweight tripod to offer a highly portable and versatile system. A single user can carry it from setup to setup and access tight spots as needed – all day long and without fatigue. This is a huge advantage because the less people are involved, the easier it is to avoid disturbing the fragile post-fire scene evidence.

在救援或清理阶段,反应小组safety is also an important topic. But Leica has that covered too. The fire brigade can monitor the structural stability of the burnt building using a Leica Total Station. If the structure starts to move, the device gives visual feedback right away and sounds an alarm. This allows the commander to order an immediate evacuation before anyone gets hurt.

All these features allow investigators to work effectively and leave the site confident that they have all the necessary data. After all, for most fire or explosion investigations, returning to the site just because someone missed an important piece of evidence is not an option.

与利益相关者无缝共享

All fire investigations start with the work of the fire brigade. If someone was hurt or there is a suspicion of arson or fraud, then the police get involved. Otherwise, it is usually private investigators working on behalf of insurance companies. For example, the investigation could be about looking at the remains to see if the value of the claim is plausible. Or it could be about finding the origin of the fire to determine if negligence or an accident was the reason for the fire.

加快调查的最佳方法是研究人员是否有无缝的3D文档和可视化解决方案。然后，您可以创建法医数字双胞胎，并允许所有利益相关者沉浸式地探索原始场景的不变记录。最终，它有助于他们做出扎实，明智的决定。

杰森解释说：“与公共安全社区和世界各地的客户共享新技术的开发和共享确实激发了我的动力。”

“过去几年的技术开发使激光扫描仪更快，更准确，更易于使用，从而使扫描数据在现场更有效，更有趣。RTC360在各种条件下提供了HI-PRECIS，准确性和可靠性的结合。没什么东西跟它一样了。”

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3 good reasons to choose theLeica RT360激光扫描仪

IMMERSIVE
The Forensic Digital Twin created on a fire scene allows investigating parties to do as many virtual site walk-throughs as they want, looking at the scene and evidence from different angles.

决定性
The resolution of a Digital Forensic Twin data created by the Leica RT360 laser scanner allows the investigator to capture and retain important information about the scene that can be important in reconstructing the story of the fire decisively.

PROTECTIVE
Leica Geosystemsfire and explosion investigation technology can also be used to monitor structural stability during the rescue, inspection, or clear-up phases thus protecting lives.