Ground Control Points - An Overview

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Ground control is just one of one of the most crucial aspects of an aerial mapping job because it guarantees accuracy. RTK- or PPK-enabled drones are experienced airborne, but their precision does not automatically convert to precision on solid ground. In drone surveying, ground control points (or GCPs) are factors on the ground with recognized coordinates that a property surveyor can specifically identify, and with these, you have the ability to accurately map huge areas with a drone.

Aero, Points are wise GCPs that you can place about your website to catch vital ground control information. Propeller sells them in sets of ten for better outright precision and to conserve time on aerial surveying. The big question is: where should you place them? Assume concerning pinning down the entire survey of your website, like bearing down a tarp over an item.

The picture listed below is just how you may establish up a website, applying that thinking. Notice that just 9 of the Aero, Points are being made use of, as well as they're not bordering the entire site.

The areas with bad GCP coverage really draw the sections with great insurance coverage misplaced, making the whole model unusable. Since this study can not be appropriately corrected, it results in mistake. This suggests you'll likely have to refly the site as well as possibly miss out on the chance to record the site in its present state.

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Right here's the exact same site once again, however currently with GCPs distributed with optimum geometry. All 10 Aero, Details are made use of in this example.

A good write-up to follow this would be the Finest Practices for Ground Control Positioning. Past this, Propeller additionally provides industry leading customer assistance as well as customer success teams that ensure that you have the resources you need to make sure that your group fully understands as well as maximizes their ground control placement for the greatest degree of study accuracy feasible.


We suggest a barrier zone between the edges of your map and any ground control factors. A greater overlap creates more images and also typically requires less barrier area.

Ground Control Information (GCPs) are big image recognizable targets that are positioned on the ground within the boundary of your drone study. GCPs are the not so secret weapon that turn maps from inexpensive consumer drones right into study grade items. The resulting data can be utilized for engineering design, construction progress surveillance and also accurate mapping applications.

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The relative elevation of an accumulation will be accurate, but the outright placement of that exact same stockpile or item will depart concerning 5m (15) flat as well as 20m (60) up and down from it holds true location. The high relative precision allows you to calculate good stockpile volumes or measure the length of an area within a few percent.

Black as well as white jobs accurately as well as has been a criterion for a long period of time, Orange spray paint is extremely visible, White V shapes work well Exemptions include snowy winter months procedures which call for clearing up snow and using shades that stand out. The black on a black and also white checker pattern works well even in winter, provided it isn't snow covered! Mounting irreversible ground control factors is a huge time and price savings for jobs that are flown repetitively or where you may not have accessibility to study quality GPS whenever you do a drone trip.


You wish to begin by putting a GCP at a corner or sharp adjustments of instructions in your project location. Nevertheless, if a gust of wind catches your tarpaulin the center can conveniently blow up in the wind. The specific very same point can occur with a drone map. It's called doming.

The efficiency of a GCP is inversely symmetrical to the range from a GCP. The area near a GCP will certainly be really accurate, the additional from the GCP the much less precise the results. It can be advantageous to attract an imaginary line circle each GCP with a 200m span.

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Secret attributes of this GCP format. GCPs are set at the highest possible and least expensive points of the website.

The example GCP layout listed below has 13 GCPs spread out throughout the site. drone imagery services. The edge and also corners are well defined with GCPs, but keep in mind that the GCPs are all set a little inwards on the task location to ensure that they reveal ground control points up in adequate images when flying. Mapping passages is somewhat various from mapping areas.

Alternative sides of the corridor, Place a GCP every 200 300m along the corridor. The example below programs a straight one mile long roadway section with 9 GCP places distributed along the length of the roadway.

Affordable drones combined with the need for better insights is leading several crushed rock pits, garbage dumps as well as building sites to establish up their own reduced price drone programs. The GPS systems to survey the GCPs can cost anywhere from $5,000 to $50,000 USD. For routine site specific drone procedures we recommend missing the acquisition of study GPS.

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Try various numbers of GCPs. It can be extremely valuable to check even more GCPs than you prepare on processing with, and also using the continuing to be GCPs for independent checks to guarantee data top quality.

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