PPK mapping with centimeter accuracy.

Use fewer GCPs Why camera synchronization is so important?

Usually autopilot triggers the camera and records the coordinate it has at that moment. When the drone is flying at 20 m/s and GPS works at 5 Hz, that means your autopilot will have position readings only each 4 m, which is not suitable for precise georeferencing. In addition, there is always a delay between the trigger and the actual moment the photo is taken.

Reach eliminates the delay

Reach solves the problem of positioning by connecting directly to the camera hot shoe port, which is synced with the shutter. The time and coordinates of each photo are logged with a resolution of less than a microsecond. This method allows GCPs to be used only to check your accuracy.

1.Connect Reach to a hot shoe port on a camera

Every time a photo is taken camera produces a pulse on a flash hot-shoe connector which is synced to a shutter opening.

2.Fly a drone, Reach will record photo events

Reach captures flash sync pulses with sub-microsecond resolution and stores them in a raw data RINEX log in the internal memory.

3.Download logs from Reach and base station

After the flight, get the RINEX logs from your airborne Reach module and a base station (Reach RS, CORS or another receiver).

4.Process logs and get a file with geotags of photos

Process RINEX files using free RTKLIB software. The produced file with precise coordinates of the photos can be used for georeferencing.

NTRIP or another Reach as a base station

To calculate centimeter-precise coordinates in PPK and RTK, Reach needs corrections from a base station. It could be either another Reach receiver or an NTRIP service. VRS is also supported.

Compatibility

Reach M2 works seamlessly with other Reach receivers over any link and are compatible with any other receiver that supports RTCM3 and NTRIP.

Comes with the Emlid Flow app and cloud-based service Emlid Flow 360

Emlid Flow is a mobile app for iOS and Android. The app handles all the fieldwork—receiver settings and data collection. All survey data is in sync with cloud-based service Emlid Flow 360, which allows you to access your projects from the browser and manage survey data.

Logging in RINEX

Logs are automatically recorded in the RINEX format for further post-processing. View a list of the logs and download them using the Emlid Flow app.
For PPK, you can use our free software Emlid Studio.

Data monitoring

Emlid Flow shows current satellite levels and your location on a map. It allows you to easily access full information about the receiver: battery charge, type of Internet connection, and receiver solution status.

Work with different background maps

Upload topographic maps, cadastral plans, and aerial imagery from WMS and WMTS sources or work with a built-in satellite map.

Managing projects in the cloud

The Emlid Flow app is synchronized with the Emlid Flow 360 service. This allows you to create and access survey projects, manage coordinate systems, and export and import data using both the mobile app and the cloud service at flow360.emlid.com.

Reach in action

3DroneMapping completes PPK trials with the average zero mean error in all axes

Luke Wijnberg, 3DroneMapping

As a brief synopsis of the results, the maximum deviation of points was no more than 0.09m in all axes. This is an incredible result given the fact that the average pixel size of the resulting imagery was 0.045m. The average mean error in all axes is just few mm!

Tuffwing gets 4cm precision without GCPs with Emlid Reach RTK

Brian Christal, Tuffwing

Tuffwing recently performed integration of Emlid Reach RTK to enable precision maps to be made without the use of GCPs. The system has been benchmarked by comparing a direct georeferenced model with a set of GCPs, used solely for error detection purposes. The lateral RMS error achieved is just 4cm according to the Pix4D quality report.

Evеnt38 integrates Emlid Reach and starts providing a ready-to-go PPK mapping solution

Jeff Taylor, Event38

In this case study, we produced an orthomosaic in the Drone Data Management System™ with 2.45cm horizontal and 5.08cm vertical RMSE, as compared with a survey-grade GPS on the ground.

GNSS

GPS/QZSS, GLONASS L1, L2; BeiDou B1, B2; Galileo E1, E5

Long range radio

External LoRa radio module: 868/915 MHz, range up to 8 km. Sold separately.

Package includes

• Reach M2
• Micro-USB cable
• JST-GH 6-pin to jumper pin cable
• JST-GH 5-pin to jumper pin cable

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