If Noah Had a Drone
When the rain stopped falling and the ark stopped rocking, Noah sent out a bird to find signs of any plant life around him. Too bad he didn’t have a drone. Farmers looking at plant and field health are increasingly using drones to give them a leg up-especially after heavy rains and floods. Here’s what these UAVs can do in the hands of an experienced pilot.
More Than Eyes Above
After a wet week of wind and rain, the weather on the farm finally took a positive turn. It was time to check the crops. From the ground, the 600-acre cornfield looked uneven but alive. Some plants were standing up, others were bent and yellowing, and muddy rows made a close inspection nearly impossible on foot. There was no way to tell whether the entire crop was lost or whether part of the field could still be saved. The question was not simply which acres had flooded. It was which plants had suffered enough stress to threaten the entire crop harvest.
So they called us in, and we launched our drone.
Within minutes, we saw what they couldn't from the ground: a narrow rise running through the center of the field, where the crops were still alive, and a blocked drainage channel that was holding water over the lowest acres. We added flights with a multispectral camera which transformed the field into a map showing crop health. Healthy plants appeared in deep shades of green, indicating strong chlorophyll activity. But long red and yellow streaks exposed the hidden scars left by standing water; areas where oxygen-starved roots were struggling, even though the plants still looked acceptable from the field’s edge.
Armed with our imaging, the farmer could focus on drainage repairs, fertilizer, and follow-up inspections on the acres most likely to recover. The drone didn’t undo the flood. But it did show which plants were fighting to survive, and where quick action could still save the growing season.
The Results
Like tractors and plows, drones are fast becoming everyday tools on modern farms. Aerial drone data helps growers see crop stress, stand issues, and water problems early enough to act, which leads to better yields, smarter fertilizer and pesticide use, and more resilient operations. But how exactly are drones used in farming and what do farmers and drone operators need to know to take advantage of these modern tools?
How farms use drones today
Growers and field experts (agronomists) use drones for fast, repeatable “crop health snapshots” across whole fields. Instead of the traditional way of scouting only a few rows, they can scan hundreds of acres in minutes, then zoom into trouble spots on foot for confirmation and planning. Typical uses include:
Assessing emergence and stand counts to see where planting went well—or where replants might be needed.
Spotting areas of disease, insect problems, nutrient deficiencies, or herbicide damage long before they are obvious from the ground.
Evaluating irrigation performance, drainage, and compaction by comparing stress patterns across the field—especially during droughts and after floods.
Documenting storm damage for insurance and replant decisions.
Which Drones Are Best for Farming?
Both multirotors and fixed wing drones can work well in agriculture; the right choice depends on the field size, sensor availability and what the final deliverable is.
Multirotor Drones
This is the typical aircraft type you probably think of when you hear the word “drone”. They have four or more motors with props and usually come in a variety of camera configurations. Some of their advantages include:
The ability to launch and land vertically in small farmyards or field entrances—you don’t need a runway.
Excellent low‑speed handling and hover capabilities for close inspection and documentation of pivots, bins, or specific problem areas.
Ease of operation. These types are simpler to fly for new pilots, and easier to integrate with most mapping software.
Lower price for entry level models.
Among their disadvantages:
Shorter flight times, so larger areas require more batteries and flight segments.
Typically slower cruise speeds and more time in the air per acre.
Fewer payload and sensor options for lower-end models.
Fixed‑Wing Drones
These can look like typical airplanes with wings, propellers and sometimes, wheels. The advantages of fixed-wing drones include:
Longer flight times and faster coverage, ideal for large or spread‑out fields.
Often better suited for high‑altitude mapping of entire farms or watersheds in one mission.
Their disadvantages compared to multirotor drones:
Need more room for launch and landing. Even "Vertical Take-off and Landing" (VTOL) types need clear space and strong procedures.
Less flexible for detailed low‑altitude inspections.
Require more upfront training and planning.
Price. In general, a fixed-wing drone with a broadly comparable sensor, navigation, and mapping capabilities costs about 2–3 times as much as a multirotor. In some professional or specialized configurations, especially long-endurance VTOL systems, the premium can be 5–10 times more.
With these prices, many farmers opt to hire out for drone services or start small and build as they get more comfortable and the savings become more evident.
Which Camera/sensor Do You need?
Beyond the basic airframe, you'll have to decide what type of camera and sensor you want to fly. This all depends on what you want to find out from your missions.
Standard RGB. These are essentially “photo” cameras with limited capabilities for plant and field health. They capture what the human eye can see: color, texture, and structure. That can work well for documenting emergence, gaps, obvious damage and for creating high‑resolution maps for variable‑rate zones or soil sampling. They can also give a broader view of drainage issues before they become a problem.
Unfortunately, cameras with RGB sensors alone can miss early plant stress, because subtle changes in plant health often show up first outside the visible spectrum, so these cameras won’t show it. In addition, varying sunlight and shadows can make it harder to compare images over time unless flights are carefully planned.
Multispectral Sensors. Cameras with multispectral sensors capture several narrow bands of light (for example, green, red, red‑edge, and near‑infrared) instead of just the red, green, and blue of a normal photo camera. This allows you to gather data that translates into a degree of plant vigor, chlorophyll content, and stress before it’s visible to the human eye (and RGB sensors).
Beyond basic multispectral, there's also:
NIR (near‑infrared): Very sensitive to leaf structure and health.
Red‑Edge: Useful for detecting stress earlier, especially with thicker plants.
Blue Band: Helps correct for atmosphere and water in some analyses, and can be combined with other bands for more specific data.
Thermal: For checking irrigation uniformity, performance & leaks, and detecting plant water stress.
Ground Truthing
Even the best drone image is only half the story. The other part is what you see when you go stand in the problem area. Unfortunately, drone imaging doesn’t eliminate walking the field or “Ground Truthing” as it’s known. This means you’ll still have to visit the field to verify what the imagery is telling you by digging roots, scouting plants, and taking soil samples. Different stresses can look similar from the air; only in‑field checks can confirm what it actually is.
Drones are excellent at turning “I think there is a problem somewhere” into “here are the specific zones to inspect,” saving time and money on scouting. It's not about replacing the farmer’s eye or the agronomist’s experience. It's about giving them better, faster information across the entire farm. If you are looking for the next practical step in precision ag—beyond yield maps and autosteer—adding drone imagery to your toolbox might be one of the most effective moves you can make.
About the Author
Mike Sobola is a Private Pilot and Commercial Drone Pilot with Mid-Atlantic Drones and author of “How to Make Money with a Drone” available on Amazon. He has logged more than 3000 hours flying drones-many of those in the DC Metro area. Mid-Atlantic Drones specializes in Drone flights throughout the Washington, D.C. Airspace and the DC Flight-Restricted Zone.
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