Ground Control Points (GCP) & Check Shots in Pix4D
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This video explains the difference between Ground Control Points (GCP) and check shots and how to use both of them within Pix4D Pro Mapper software to obtain survey grade accuracy Attributes of GCPs and Check Points GCPs are used to rotate, scale and orientate the project in a real world location or in some cases in a “Local Coordinate System) GCPs are typically statically placed around the outside edge of the project with at least one GCP in the interior of the project GCPs should not be more than 1,000-1,500 …
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Drone Mapping Accuracy – Part I – Ground Control Points (GCP)
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In the business of UAV mapping, accuracy is everything. As my surveyor partner indicates, “If you don’t have an accurate project, it’s nothing more than a pretty picture…”. Close enough is great if you are playing horseshoes or tossing hand grenades. However, if you are doing UAV mapping, being “close enough” is a waste of your time and your clients’ money. So, how do you obtain the highest amount of accuracy in your drone mapping project? The most common method is to use Ground Control Points. (Another method, Real Time …
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What are Ground Control Points (GCPs)?
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They are precisely known fixed points used to: Adjust a mapping project to these known fixed coordinates in order to obtain absolute accuracy in latitude, longitude and altitude. They will: Correctly locate the project on the earth Correctly scale the project in all three axes Enable better measurements, volume calculations, … Read More

Drone Mapping Accuracy – Part II – Real Time Kinematics (RTK)
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In an earlier post, we discussed Ground Control Points as a primary method of obtaining survey grade accuracy from drone mapping. The photogrammetry/mapping software (such as Pix4d Pro Mapper) uses these GCP to make adjustments to the project to obtain survey grade accuracy. However, this method requires laying out and precisely geolocating numerous control points (approximately every 1000 to 1500 feet). Depending on the terrain and/or the size of the project, the GCP method could be very impractical, difficult and time consuming. Another, arguably more advanced method, is referred to …
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Presentations
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PRESENTATIONS Various training presentations created either by Vertical Aspect or other sources (Available for downloading and viewing) (Vertical Aspect) UAV Mapping & Modeling Overview Presentation (Vertical Aspect) Mapping on a Budget (Vertical Aspect) Launching Drone Services (Vertical Aspect) Ground Control Points (UAV Coach) How to Get Liability Insurance Coverage (UAV … Read More

UAV Mapping Apps & Links
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Here’s a handy list of Apps, desktop and web-based software and useful Web sites…  Contact Us if you have any suggestions to add to the list… MAPPING CAPTURE APPS The apps are necessary to control the DJI multirotor mapping.  They’re used for developing the flight plan and transmitting it to … Read More

Can I get survey-grade accuracy from UAV mapping?
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Yes, you can generate absolute accuracy to within 1/10 of a foot providing you either use Ground Control Points or use an RTK (Real Time Kinematics) equipped aircraft. We have a slide deck on Ground Control Points on our presentations page page that provides additional information. Yes, you can generate … Read More

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