The huge market targets known as Ground Control Points, or GCPs, deliberately place large marks on the ground in your region of interest. First, you must get the RTK GPS coordinates for the middle of each ground target if you plan to employ ground control points with your aerial map.
Drone mapping software then positions your map precisely about the surrounding world using the ground control points and their coordinates. Given that DroneDeploy is aware of the precise positions of each of these thumbtacks, it may be helpful to think of your GCPs as a series of pins put on your drone map. It might serve as a reference for their placements when it coincides with all the other map points.
Why could you employ GCPs?
GCPs significantly improve a map's absolute or overall accuracy. They ensure that any spot on your map's latitude and longitude precisely match the GPS coordinates. When accurate global mapping and precision mapping are required, this is crucial.
Find out more about increasing mapping accuracy here.
Find out more about sea levels, predictions, reference systems, and EPSG codes here.
How to map using drones after successfully capturing ground control points (GCPs).
GCPs collection:
- To get started, read over our GCP Request checklist first.
- At least four GCPs are necessary; you should distribute them as far and equally as you can around your site.
- Place markers close to any points of importance on your property, such as a stockpile or the foundation of a building, if you have any that you are particularly interested in.
- Try to set markers close to the site's highest and lowest points if significant topographical elevation differences exist.
- DroneDeploy advises leaving a 50-foot (15-meter) space between the edge of the map and the placement of the GCPs when setting them around the perimeter. This will guarantee that there is sufficient picture coverage for processing.
- By adding Checkpoints, you can verify your GCP maps' absolute and relative correctness. Use DroneDeploy: GCP Checkpoint to process them.
- Ask your surveyor what EPSG code they are using, or set your device to WGS84 / Code 4326 to ensure you know the EPSG code being used for your measurements.
GCPs capture
Flying GCP trips is the same as flying any other aircraft. The only change is that you are now using your images to record GCP targets, which will be used to improve the accuracy of your map in the future. Verify the focus and setup of your camera. The procedure will only produce the same levels of precision if the GCP targets are in the direction. Verifying that the place you will be flying to that day will have decent weather is always a smart idea. Flying and mapping might be challenging when strong gusts, dense clouds, or precipitation occur.
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Processing and uploading your photos:
DroneDeploy needs detailed information for your project to guarantee your GCPs process correctly and effectively. It can be difficult at first if you are unfamiliar with DroneDeploy and/or GCPs, but after that, it becomes simple. Please review the following articles for some advice:
- Processing GCPs with DroneDeploy is an article that details the upload and processing procedure for GCPs.
- Uploading GCPs all at once as a new project: Using GCPs to start a new project.
- Adding your GCPs to a map that has already been processed: GCPs being added to a processed map.
- You should make the following formatting adjustments in the browser tagging tool before submitting your GCPs: GCP. CSV File Formatting.
- If you're using AeroPoints, download the CSV of the data points you've gathered; DroneDeploy's CSV uploader will accept this file.
- The Coordinate Reference System (CRS) needs assistance creating a CRS for new and ongoing projects.
- Try searching our list of supported EPSG codes: EPSG Service if you need to help locating your EPSG code in DroneDeploy.
GC Access
Individual clients and Advanced, Teams, and Enterprise customers can purchase GCP processing ($49 per map). Contact support@dronedeploy.com if you are an existing Lite or Individual subscription customer and want to add GCPs. If GCPs are the best choice for your mapping project, we can assist in determining that as well.