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Aerial imagery is a common asset in military matters, but 3D maps can be difficult to collect on short notice without specialized equipment. This new photogrammetry technique from the Army Corps of Engineers, however, can make accurate 3D maps from ordinary aerial footage in just minutes.

Photogrammetry is the process of comparing multiple photos of the same location or item to produce a 3D map of it. It’s a well-known method but in some cases is still reliable on human intelligence to determine, for instance, which frames of a video should be used to produce the best results.

Ricky Massaro from the Army’s Geospatial Research Laboratory in Virginia has mitigated that problem and produced a highly efficient photogrammetric method that can turn aerial imagery into accurate 3D surface maps in near real-time without any human oversight.

This image shows the depth map as color – red being higher. It was created from combining multiple 2D images.

The system was tested by the 101st Airborne, which flew a drone over Fort Campbell in Kentucky and mapped a mock city used for training exercises. It was also deployed in Iraq for non-combat purposes. So this isn’t stuck in a lab somewhere — it’s been put to work, and is now being publicized because the patent filing is in and the Army is now negotiating to commercialize the system.

“Whether it’s for soldiers or farmers, this tech delivers usable terrain and intelligence products fast,” said Quinton King, a manager at TechLink, the Defense Department’s commercial tech transfer organization. “And I’m happy to help companies learn how they can leverage Dr. Massaro’s work for their own products or applications.”

The real-time photogrammetry wouldn’t replace lidar or ground-based mapping systems, but act in concert with them. Being able to produce accurate depth from ordinary aerial imagery, and without having to send tons of data to a central location or involve human experts, makes it adaptable to a variety of situations. If you’re curious about the specifics, you can check out the patent application here.


TechCrunch

After a Wall Street Journal investigation concluded that there are millions of fake business listings on Google Maps, the company has issued a response detailing the measures it takes to combat the problem.

According to estimates from online advertising experts surveyed by the WSJ, there are “roughly 11 million falsely listed businesses on any given day,” with hundreds of thousands more fake listings appearing every month. Many are placed by businesses that specialized creating fake listings for clients that want to boost their information above competitors in search results.

According to a search expert interviewed by the WSJ, a 2017 academic study paid for by Google that found only 0.5% of local searches researchers examined were fake was skewed by limited data.

In the company’s response, Google Maps product director Ethan Russell wrote that of the more than 200 million listings added to Google Maps over the years, only a “small percentage” are fake. He said that last year Google took down more than 3 million fake business profiles, including more than 90% that were removed before users could see them. Google’s systems identified 85% of the listings removed, while 250,000 were reported by users. The company also disabled 150,000 user accounts found to be abusive, a 50% increase from 2017.

Russell wrote that the company is “continually working on new and better ways to fight these scams using a variety of ever-evolving manual and automated systems,” but can’t share more details about them because otherwise scammers might find a way to get around them.

The WSJ report comes as another Google-owned service, YouTube, is under scrutiny for how it fights abuse at scale. YouTube released its first anti-abuse report last year, but problematic content, including hate speech, continues to be a major problem and the platform’s critics say it haphazardly enforces its own policies.

Along with Apple, Amazon and Facebook, Google’s parent company Alphabet is currently facing antitrust investigations by the Federal Trade Commission and Justice Department, and its search business is expected to go under scrutiny.


TechCrunch

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