Time-lapse photography with drone parts

Let’s say you’re a journalist and you want to record an important event taking place over an extended period, say 12 to 72 hours. Or even a week, or longer. If you want to record the event with video, that’s far too long to expect anyone to watch it in its entirety.

You can, however, record the whole thing and use some kind of time compression in post-production software. But if you’re recording on high definition video, you can only expect to record about four hours on a 32 gigabyte SD card. Even if you manage to capture 12 or 72 hours of high-definition video using a hard drive, it’s going to be hard to work with such a big file.

The solution is time-lapse photography, which simply means taking photos at regular intervals and turning them into individual frames on a video. During hurricane Sandy, a number of news sites and tech-savvy citizens used a time-lapse photography to document the storm's impact on New York City (below). If you’re not in a hurricane-prone area, you can find other weather-related applications for this technique, such as recording a flood-prone area during a storm.



Of course, you could just as easily record important non-weather events, such as big construction projects, or traffic on a bottlenecked road. Compressing these large-scale but slow-moving events into a one or two-minute clip makes for dramatic video.

At its most basic, you only need two things to pull off a time-lapse video. You’ll at least need a camera equipped with an intervalmeter (a fancy way of saying it can be programmed to take photos at regular intervals), and software to turn the photos into videos.

A camera battery will only last so long, though. If you’re hoping to capture an event longer than three hours, you’ll probably have to rig up an external power supply. This power supply can be as simple as a motorcycle battery hooked up to a voltage regulator, or it can be a sophisticated, computer-controlled lithium polymer setup with photovoltaic (solar) cells. Then there’s the matter of finding a memory card of sufficient size, and a mounting solution with sufficient stability.

Simple is better. If you’ve got drone journalism equipment lying around as I do, you likely already have all the requisite components to make a great time-lapse video. The following is a breakdown of my own experiment in time-lapse photography, which you can replicate or modify to suit your own needs.

Canadian International Council and a year-end status report

Earlier this month, the Canadian International Council wrapped up its "Drone Week," which pooled the writings from national policy and technology experts, to help understand how drones could change the air and ground in three different contexts: Kill, Watch, Aid.

Much of this conversation revolved around the proliferation of drones as weapons. As I wrote in my own CIC piece for Opencanada.org, "Drones for Good," given the history of media's relationship with technology, this was only to be expected:

If we’re being dictionary-accurate, though, “drone” merely means an airplane or boat guided remotely. The first drone was invented by Nikola Tesla, who wowed audiences in New York City’s Madison Square Garden with a radio-controlled boat in 1898. His audience, baffled and scared by the demonstration, likely had little or no previous exposure to radio technology. It would be nearly a decade until the first public radio broadcast, a live transmission from the Metropolitan Opera House.

A New York Times reporter asked the question that would dog the technology from that day on: What of the military applications for the tiny electric boat? “You do not see there a wireless torpedo,” Tesla replied, offended by the reporter’s suggestion. “You see there the first of a race of robots, mechanical men who will do the laborious work of the human race."

 Combine the public perception of drones with the public perception of the media and journalists, and it's easy to see how drone journalism faces and uphill battle. But, I wrote, limiting domestic drone use would have consequences.

In other news, weather has been particularly miserable for flying drones as of late here in central Illinois.

The cold really isn't the limiting factor here, either. Cold temperatures make it difficult for small gas motors to operate (they rely on glow plugs to ignite the compressed mixture of air and fuel, which requires heat). But lithium polymer batteries are actually fairly resilient to the cold.

The autopilot might be the limiting factor in cold weather, as I'm finding out the ceramic resonator that keeps the autopilot microcontroller in sync can be thrown off by extreme temperatures. However, it's much easier to warm something up than cool something off from an electrical standpoint. Cold isn't fun, but it's not ultimately a deal-breaker.

Wind actually is the biggest problem. It's hard to fly my current fleet of drones in 15mph winds. It's not impossible to fly a drone in that kind of wind, it just requires a bigger drone (an 8 foot wingspan would be nice).

While I'm waiting for the weather to improve, I'm focusing on using drone equipment for other data-gathering applications, and working on drones that I can actually fly indoors. More on that in 2013.

An introduction to small drones - from the AMA

Go back just one or two years in the world of drones, and you'll notice a distinct separation between the price of these small, remotely-guided aircraft. At the top end, you had systems like the Gatewing X100 and the DraganFly X6 which cost $20,000 and up, with some models . These units were generally designed for commercial or government use, and with adequate training, can be flown "out of the box."

But for hobbyists and members of the DIY/Maker movement, similar products could be hacked together from GPS and gyro-equipped microcontrollers, RC electric motors, and RC radio equipment for about $1,000.

This price point has made drones very attractive to "hacktivists," or activists with a great deal of technical ability who use that expertise to further the goals of a political cause. Think Tim Pool and the Occucopter, anti-ACTA protestors in Estonia, N8 protestors in Argentina, or SHARK and its Angel Drone (recently shot down for the fourth time).

The video obtained from these aerial platforms have proved useful in rallying support and attention to political movements. Journalists would do well to take notes from how the hacktivists have deployed drones around the world -- because these methods can be easily transplanted into journalism.

The cost of drones has dropped considerably in recent years, now opening up a nice $2,000 - $15,000 range of drones that don't require much hacking experience at all. But there's just one big problem: regulations. There's currently not a place in the FAA regulations for a viable commercial pursuit of drones, and that includes commercial journalism.

There is, however, a place for government and research institutions to use drones. That place is called a Certificate of Authorization, or COA (pronounced "Koh-ah" in the industry).

But let's say you're not a government institution, and still want to fly a drone. There is still a place for you to fly a drone, albeit as a hobbyist.

The FAA regulation AC 91-57 allows anyone to fly a remote-controlled vehicle, for recreation, so long as the aircraft is not flown above 400 feet AGL (above ground level), or within 3 miles of an airport. You must also give way to full scale airplanes, should they enter your airspace (but that really shouldn't happen, given that the lowest legal limit for an airplane to fly is 500' AGL).

Since you're flying as a hobbyist, you should get to know the Academy of Model Aeronautics. The AMA dates back to 1936, and it's the largest association of its kind in America. Club members have years of experience dealing with nearly the exact same kind of controls, radio equipment and motors that make the majority of the $15,000-and-under drones work.

And as a paid member, you get $2.5 million in liability coverage, should your drone have an unfortunate series of events. Keep in mind that coverage is only valid if you follow AMA guidelines.

The latest issue of Model Aviation, which is AMA's official magazine, has quite a few pages devoted to drones. Apparently quadrotors are the biggest growth area for the entire RC hobby. Hobbyists are especially captivated by the aerial video capability of these drones (seeing a theme here?).

The December issue has a great write-up that's a good introduction into multi-rotor drones meant for hobbyists, but it's great for journalists as well.

An excerpt from the article:

Multicopters come in all shapes and sizes. Although there are configuration differences, they all have the same basic components: pilot command and control, motors, propellers, ESCs, a frame, and a flight control module.

Depending on how advanced you want to be, multicopters may also have video cameras, GPS, compasses, barometers, sonar sensors, and telemetry. Often, many of the sensors and secondary options are built into the flight controller, which also houses the electronic gyros and accelerometers found on most multicopters.

 The article also includes some interesting historical background on the origin of multicopters and similar aircraft. Read "Rise of the multicopter" here.