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Radio Frequency Data Collection

Remote sensing with a difference. That’s what Ellen Christopherson, CEO and founder of clearGrid, is here to talk about.  Their unique way of collecting radio frequency (RF) data makes them a valuable partner for utility and energy companies that do any type of meter readings and billings. Ellen’s background in aviation engineering gives her an edge to see how technology can deliver efficiency in this space.

The Laborious Task of Collecting Meter Readings

It’s a massive task to get data from a meter back to the office in a format that the utility company then can use for their operations. Typically, there is a meter installed in a building (or somewhere that can send data), but the signal can be obstructed from different types of objects.  Sometimes the exact location of the meter is unclear.

Companies have two ways around these challenges:

Ground-Based Data Collection

Basically what this looks like is a person drives around and collects data. In order to do this successfully the signal from the meter needs to penetrate the built environment and make it to the road where the data can be collected from a vehicle. This model also assumes that the location of the meter is known in order to optimize the collection path but this is not always the case.

Mesh Network

The meters of the network talk to each other or a central node.  It takes years to set up a system like this, if at all possible because it’s only viable for utilities that have a denser population ̶ cities.  Electric utilities tend to look into this because of the capital required to set it up, especially on the IT side.  It needs an overhaul of the entire IT system to be able to handle that kind of data coming in.

Solution? Flying Drones to Collect Data

From 4500 feet above the ground, you get an entirely different viewpoint on a meter than you would from the ground with obstructions, buildings, or trees.  Planes pass by within a certain distance of an address and pick up readings.  The signals are then triangulated. Every time a meter is heard, the location and the signal strength are recorded, and a 3D map of that RF environment is created.  A physical address becomes less of a concern because its own coordinates are now established, and a smart flight route in 3D space can be planned to hear that meter.

What about All the Other RF Signals out There? Isn’t That Space Crowded Already?

Technology has made it possible to filter out signals and handle all of the meters chirping in at once.  Each meter has a unique identifier that’s attached to the rest of the data, making it easier to sort through it later.  Meters are categorized by their identifiers, and this becomes their data point to associate everything else with.  You can tie this back to a particular utility and keep the data separate if you need to.

The meters don’t have location data in them.  The guestimate on where the meter is located comes from the triangulation, grabbing the signal data from multiple angles. Not only does this pinpoint where the meter is, but it also reveals its environment and what’s potentially blocking it.  If it’s blocked, the signal can only come from straight above, while if it’s wide open, it’s possible to get a signal from 190km away. Triangulation gives data a powerful context.

What’s the Collected Data Like? What Can You Do with It?

After collection, you end up with a unique data set.  A set unlike other sets out there.  It provides a smart flight path so that next time the information can be collected as efficiently and quickly as possible.

You can also take the data and see what the RF environment looks like.  You get a detailed picture of a planned mesh network with specifics on potential interference.  You also get to see where the signals are not located and understand what buildings or structures are impeding RF signals in that area.

Do Environmental Conditions Affect the RF Environment?

Definitely. Changes happen all the time.  Other RF signals can enter your space.  For example, you keep adding more and more devices into your smart home, and eventually, you change the whole RF environment.  Or there could be temporary structures erected and taken down the next month.  Every time a flight takes place, these changes are recorded.

Surprisingly, foliage is not a big problem. Some RF signals can be affected by foliage, but with the ranges ClearGrid uses, it’s not an issue.

How Do the Meters Broadcast Signal?  On-Demand?

It depends on the meter.

Some transmit all the time, or at least at regular intervals, while others need to be pinged and woken up to transmit.  There are many types of meters and manufacturers out there, but ClearGrid is flexible and works with what’s given. It’s best to use the same type of meters for a system to be efficient and to avoid bottlenecks.

Can You Use This for All Utilities?

Data collection this way is applicable for all utilities, yes.  The only assumption is that the meters in place are all RF capable meters.  The system is agnostic, and therefore, it’s useful in so many other areas.

In the energy industry, anti-corrosion is a critical part of maintaining the infrastructure.  This technology can help cathodic protection systems on pipelines without sending people into dangerous and far away areas on foot to take measurements by hand.  Works with abandoned wells, too, via down wall monitoring and grabbing the data and tracking from the air.

Sensors can be customized and outfitted with communication devices that are used on our planes.  In a pipeline scenario, to get as much life out of the battery as possible, these customized industrial sensors are woken up to send signals when it’s time to collect data in the area. In the meantime, they are programmed to collect information at appropriate intervals and keep the data.

Isn’t a Mesh Network or Using the Internet of Things going to solve this problem in the future?

It could very well be in the future.  But for now, lack of connectivity is an issue, especially in rural areas.  It limits both mesh networks and IoT.

Another issue is that once you set up a mesh network, what do you do with the data that’s coming in, without overwhelming your system and your people? It’s not just a matter of connecting everything together. Your data has to be channeled and appropriately analyzed.  This is a huge roadblock, and a massive overhaul needs to be implemented on the IT side of your business so that the information collected is useful to the people sitting at your end.  Artificial Intelligence can be an excellent tool, but with utilities, it’s not there yet.

Is There a Drawback of Using Drones?

The biggest challenge is regulation.  Think about a utility service territory. It’s a vast area, it could even be nationwide, and you need to cover it every month. Regulations for drones vary from country to country.  Most of the time, it’s limited by line of sight.  If it’s not, then there is a further limitation to airspaces, international airport spaces, military zones, or flying along borders.  Drones are not welcomed in many airspaces right now.

On the technology side, you need a drone that can handle more extended missions and cover sizable areas of ground.  Larger drones can handle this. They have enough power to stay up in the air and accommodate the incoming data flows.  Diamond Aircraft (DA42) have full conversion kits to unmanned, and they’re capable of providing the power necessary for the task with ease.  Until they hit another regulatory roadblock or limited airspace, that is. However, the current regulations focus on small drones, so they face more regulatory challenges.

Isn’t This What Remote Sensing Companies Do?

Remote sensing is a vague definition.

It’s always best to narrow down the mission and not overwhelm people with the technology that’s delivering it.  The mission should be solving problems, not talking about technology.   People who aren’t in the remote sensing industry should understand what we offer, which is so much more than just collecting data.


Do you agree with Ellen’s visionary marketing strategy in drawing in non-tech GIS crowds to understand what problems they solve? As someone who loves all shiny and techy things, I tend to agree.  How else do you think we can make GIS more accessible to laypeople?

About the Author
I'm Daniel O'Donohue, the voice and creator behind The MapScaping Podcast ( A podcast for the geospatial community ). With a professional background as a geospatial specialist, I've spent years harnessing the power of spatial to unravel the complexities of our world, one layer at a time.

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