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Using Reach RS+ for the Road Maintenance Project in Mexico

In March 2019, Mexican CoatzaDrone conducted a topographic survey of the “Las Choapas-Cárdenas” road section in Tabasco, Mexico using Reach RS+. The goal was to create a detailed 3D model and an orthomosaic as part of the road maintenance project.

Emlid Reach RS+ at work for CoatzaDrone
CoatzaDrone surveyor is capturing a GCP with Reach RS+

An area of 4.7 ha was mapped with a DJI Phantom 4 Pro and a Mavic 2 Pro.

The CoatzaDrone team set seven ground control points (GCPs) at the project site.

All GCPs were captured with a Reach RS+ rover. Corrections were acquired from an RS+ base in RTK mode. This whole process took less than thirty minutes.

DJI Phantom4 with Reach RS+ base
DJI Phantom 4 Pro lands at the end point of the mission

The raw logs were then post-processed using the geospatial analysis software. This was done in order to double check GCPs’ coordinates measured in RTK mode in the field.

Once the GCPs’ coordinates had been checked, CoatzaDrone engineers imported the point coordinates to Pix4D along with the images captured by a drone. Some images demonstrating the workflow are in the slideshow below.

  • CoatzaDrone Emlid Google Earth 1

In order to compare 3D models of the road, the data was processed using Agisoft Metashape photogrammetric software. Watch the video of the process on Facebook.

Agisoft Project with Reach GCP by CoatzaDrone
3D road model in Agisoft

There is a great advantage in using Reach RS+ for placing GCPs. It allows us to spend fewer man-hours than on a traditional survey. And because of optimizing the resources of the team, we can deliver the best quality data to our clients promptly. What I also like about Reach is that it’s very easy to configure and use.

Alvaro Ruiz, Head of Operations at CoatzaDrone

Reach RS+ for placing GCPs

With a set of Reach RS+ communicating via built-in LoRa radio, you can set as many GCPs in RTK mode as it is required. The process is quick and does not require an Internet connection. Control points locations are recorded with ReachView app available for iOS and Android. After the fieldwork is done, you can export data to your preferred mapping software in CSV, GeoJSON, DXF or ShapeFile formats.

Emlid Reach RS+ Survey Kit