The mysterious Apple minivans roaming the roads in California, Florida and elsewhere are generally assumed to be self-driving cars, but they are not. They are almost undoubtedly collecting data for maps.

They are “almost certainly a mapping vehicle,” said Paul Godsmark, chief technology officer with the Canadian Automated Vehicles Centre of Excellence, who examined photos of the mystery vehicles at Cult of Mac’s request.

Spotted around the country in recent weeks, the mysterious minivans jump-started the rumor mill with regard to a possible Apple car rolling out in the future. Since then, a steady string of reports have lent credence to the possibility that Cupertino has its eye on transforming the automotive industry just as it did with computing and mobile devices.

Godsmark is an autonomous vehicle specialist who co-founded CAVCE, a nonprofit consultancy that promotes autonomous vehicles in Canada. A civil engineer by trade, he also designed roads.

“I know about how roads are designed, built, maintained and operated,” he told Cult of Mac, adding that LIDAR mapping is becoming increasingly popular for a range of activities, from road maintenance to asset management.

Godsmark said the giveaway on the mysterious Apple vans is the placement and angle of the LIDAR gear (which he thinks to be Velodyne HDL-32E units) on the roofs of the vehicles.

LIDAR is an extremely accurate range-finding technology that bounces laser light off objects and measures the light bouncing back, hence the name, “Laser Illuminated Detection and Ranging.”

On mapping vehicles, the LIDAR units are usually mounted high, to get the necessary height for modeling, and tilted down. As the vehicle drives along the road, the LIDAR units capture a 3-D model of the road and its surroundings. It is “effectively building the model by taking slices as the vehicles moves,” Godsmark said.

He pointed to other mapping vehicles, like this TomTom vehicle with LIDAR on the back, these Mandli mapping cars and this Verus Geomatics truck, which is typical of vehicles used for asset-management purposes.

LIDAR is also used in autonomous vehicles like Google’s prototype car, but for those purposes the units are usually mounted horizontally, as in Google’s first self-driving vehicle, Bosch’s autonomous vehicle, this self-driving Land Rover and Nissan’s self-driving cars.

The LIDAR units are mounted horizontally to maximize the sensor range, Godsmark said. “I am fairly certain that the vehicle in your photo is not an autonomous one, but that it is being used for mapping,” he concluded.

Professor Ümit Özgüner, an expert in intelligent transportation systems at Ohio State University, also said the vehicles are likely being used for mapping purposes.

“There is nothing to indicate autonomous driving. The only thing you see are the sensors — LIDAR, cameras — and the GPS antenna on the top.”

“There is nothing to indicate autonomous driving,” he said. “The only thing you see are the sensors — LIDAR, cameras — and the GPS antenna on the top. So I would first say 3-D modeling/mapping is going on.”

The notion that the mysterious minivans are autonomous came from the original CBS report. Analyst Rob Enderle floated the suggestion that they were self-driving cars — because they have too many cameras! — and the idea spread from there. Subsequent reports that Apple has thousands of engineers working on project Titan added fuel to the fire.

However, autonomous cars are licensed for testing in only four states and the District of Columbia. Apple hasn’t been issued a test permit in California, where a couple of the vehicles have been spotted, according to the state’s Department of Motor Vehicles.

Why is Apple getting into detailed street-level mapping? Adding data to its Maps app is the likeliest reason. Google Maps’ Street View is a popular product, and Apple has been ramping up its mapping efforts to match those of its rival. Apple already offers photorealistic bird’s-eye views in its Map software, but nothing at street level. The mystery minivans also appear to have cameras at each corner, making this seem plausible.

However, a comprehensive mapping effort would require fleets of the vehicles, deployed all over the world. So far, the mystery vans have been spotted in a handful of states (including New York, where there’s no provision for self-driving cars), but they might be prototypes being tested before a bigger effort is launched.

There could also be other reasons for the mystery vans. Vehicles bristling with LIDAR sensors can also be used for:

Street view inventory: How many businesses are operating along a certain road? What kind of road signs are there? How many light poles are there? All this data — and even details like the number of cafes with outside tables and chairs — are easily extracted from LIDAR maps, Godsmark said. The data might even be used to supplement Siri’s knowledge of the world. “This could be Siri on steroids,” he said.

How many businesses are operating along a certain road? What kind of road signs are there? How many light poles are there? All this data — and even details like the number of cafes with outside tables and chairs — are easily extracted from LIDAR maps, Godsmark said. The data might even be used to supplement Siri’s knowledge of the world. “This could be Siri on steroids,” he said. Real estate planning: Physical location, accesses, proximity of competing businesses. Maybe Apple is scouting locations for new stores (or Apple Watch stores). The company is known to plan its locations using a ton of data, including neighborhood median income and proximity to freeway exits.

Physical location, accesses, proximity of competing businesses. Maybe Apple is scouting locations for new stores (or Apple Watch stores). The company is known to plan its locations using a ton of data, including neighborhood median income and proximity to freeway exits. Video games: Driving simulations could be set in photorealistic real-world locations.

Driving simulations could be set in photorealistic real-world locations. Autonomous driving: In anticipation of self-driving cars, some companies and even the state of Utah are beginning to build base maps that would aid autonomous vehicles in the future. Godsmark said Apple has been employing people with autonomous driving and machine-vision backgrounds since at least 2009, but didn’t provide further details.

Brett Davis, vice president of communications and publications at the Association for Unmanned Vehicle Systems International, declined to guess what the mysterious Apple vans are all about.

“Unfortunately we don’t have enough information on these to speculate, and we don’t want to steer you wrong,” he said. “Sorry for the pun.”