Five Weather Conditions Affecting UAV Drone Mapping

In UAV drone mapping, the drone transforms from capturing images to collecting information, thereby generating 2D/3D models. UAV mapping significantly improves efficiency and shortens mapping time compared to traditional mapping. So how is data accuracy guaranteed? Is it affected by weather conditions?

UAV operators typically use RTK drones or LiDAR drones for surveying and mapping. High-precision drones capture images with clear location information, so why are there gaps, artifacts, and accuracy issues when generating point clouds later?

Here, we will explain the impact of weather conditions on surveying and mapping results.

What kind of weather is best for UAV drone mapping?

First, high-performance drones are more resistant to wind, rain, humidity, and high temperatures than most pilots imagine. The weather resistance of drones is not only reflected in IP43 or IP55 ratings, but also in the verification of actual operational projects.

UAV Drone Photogrammetry on Cloudy Days

While the best weather for drone photography is clear mornings and evenings, UAV photogrammetry is more suitable for cloudy days.

In UAV drone photogrammetry, light and shadow are essential considerations. Overcast skies prevent the measurement of buildings/structures from casting shadows, which become dark spots in data processing, ultimately leading to sparse areas, artifacts, and accuracy issues in the measurement results.

Of course, not every UAV drone photogrammetry operation is conducted on overcast days. If you are conducting UAV mapping on a sunny day, it's best to choose midday, when the sun's angle is highest and shadows are shortest.

Dust and Smoke Under the Lens

When conducting UAV mapping at large construction sites and mines, the air at the work site is always filled with dust and smoke. If you are conducting low-altitude mapping, this dust or smoke will obscure your UAV lens, making the images blurry and resulting in numerous artifacts in the subsequent mapping software output, rendering the results unreliable.

The UAV's defogging mode only affects the internal processing of the captured images and cannot address results caused by external environmental factors. The lower the altitude, the greater the sharpness, but the larger the generated file, and the more susceptible it is to the influence of dust and smoke at the construction site.

Typically, the optimal altitude for drone mapping is 50 to 120 meters (160 to 400 feet) above the ground, but this depends on the required ground resolution (GSD), lens and sensor size, terrain limitations, and applicable regulations. In the United States, drone flight altitudes are generally limited to below 400 feet.

Water, ponds, swamps, and glass structures: Low-reflectivity objects

In drone photogrammetry, richer visual texture makes it easier to recreate features during modeling. Swamps, ponds, lakes, and glass structures have weak visual texture, making it difficult for post-processing mapping software to find commonalities between overlapping images to stitch the dataset together.

However, drones perform better than drones in mapping winding rivers compared to areas with large open bodies of water.

Flying drones in rain, snow, and thunderstorms

Rain, snow, thunderstorms, and hail are all unsuitable for drone flights, let alone drone mapping.

Whether it's drone photogrammetry or LiDAR mapping, drone-captured data is highly susceptible to the reflectivity of water droplets and snowflakes in the air, producing artifacts in the final results. Furthermore, drones are inherently unsuitable for flight in harsh weather conditions such as rain, snow, and thunderstorms.

Flying Drones in High Winds

Whether it's a consumer or industrial drone, wind resistance is a major factor influencing your purchase decision.

Drone mapping in high winds significantly impacts your drone's flight time. For a drone to fly in windy conditions, it must overcome wind resistance, affecting its thrust. Drone operators need to carry extra battery accessories as a precaution.

Photogrammetric drones typically feature mechanical shutters and three-axis gimbal-stabilized cameras, preventing camera instability and blurry images caused by wind.

Captain's Decision

Performing thorough pre-flight checks is crucial for every drone mapping mission. Weather conditions not only affect the drone's flight performance but also the accuracy of point cloud model generation and Gaussian Splatting.

If you're building a drone mapping project, purchasing an RTK drone is essential. Start your surveying and mapping project with an Autel Mapping drone!