Sw Maps Ntrip

[Nell Barreto]

I paired my android phone with a Ublox high accuracy receiver. While Field Maps shows proper accuracy numbers, Survey123 gets down to 3.9m and than stays there. Please advise on how to make RTK receivers supply and show proper accuracy readings in Survey123.

In Survey123 have you chosen the Integrated Provider? When you are using an app to add RTK and then make that corrected position available to other apps via mock location, you need to have Survey123 configured to use the Integrated Provider (instead of connecting directly to it with bluetooth).

Some specific receiver hardware/software combo's do pass the corrected information from their app back to the receiver (some Eos Arrow's - not all I think), so that you can can connect to it via bluetooth and get the corrections, but this is not common.

I'm experiencing similar problems with Lefebure and Field maps, but on one device (android 11) I've the problem and on another (android 9) it's fine.
I thought it is related to device or android version, but if you have a different effect with two apps, it could be related to a setting, for example coordinate system?

With help of Esri Support we could partly resolve this issue. The trick is to use Android Location and not Google Play Location. With some receivers S123 and QuickCapture are able to make the change from GPL to AL automatically. In QC you can do it manually by activating additional settings. This is done by holding down "About" for few seconds until "Reset" appears at the bottom. Then you will find this additional button in settings. After this it works smooth in QC. I tested on Android 8 and 10 with Lefebure and ArduSimple RTK GNSS. This workaround is yet to be implemented in S123.

As long as a receiver supplies NMEA, FM should be able to use it as does QC. Lefebure is a very stable app. I have tried it with few other receivers and it just works! Hope to hear from Esri soon. Will keep you posted.

If I install a third-party app (eg. from Trimble), the correct accuracy is detected, so I think this confirms that the problem is by FM, unfortunately. But somehow linked to NMEA used messages or integrated GPS/mock location..

Befause if I use some GNSS without NTRIP compatibility and use Lefebure, I'v this accuracy problem.
If I use an external GNN that includes SIM card and NTRIP correction, the accuracy is detected correctly by FM, then.

I am having problems with connecting to my cors supplier with Ntrip from Reach RS.
It works with Lefeburne ntrip client sending corrections over BT without problems.
When trying to connect from Reach RS it gives me a error 401 / unauthorized.
I have tried both with home wifi and cell phone wifi hotspot.
I am using the latest Reachview version.
Does anyone know what might be the problem ?
Lefeburne works with both home wifi and cell phone hotspot.

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 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.

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 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.

I have an issue where a job was started using the P4RTK and then was finished using a P4P. When the client entered the data into ARCgis, the RTK tiles moved south by 10klm and the P4P tiles were accurate. All controlled by GCPs, so no problem there. Any suggestions as to why the RTK data is a problem. I would have expected an error of 50 cm before rectification during processing.

Is it possible to find a picture almost directly over a GCP that was taken with the RTK and compare the coordinates? I would expect around 5-6 minutes difference in longitude. do you have another way to verify the base coordinate that was used?

Thank you for your suggestions. I made a mistake in the ESPG format. Once I corrected that, all maps displayed correctly. Simple error, but lost focus at a critical moment in processing.
Thanks guys.

Whether you are conducting a full scale GNSS survey with high precision instruments, need to collect largeamount of location based data using nothing but your phone, or just need to view a few shapefiles withlabels over a background map on the go, SW Maps has it all covered.

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All data recorded and exported by SW Maps is in the WGS84 geographic coordinate system (EPSG:4326). SWMaps supports exporting point coordinates in Universal Transverse Mercator (UTM) in Spreadsheets andCSV format. For importing shapefiles, geopackage and WMS layers, SW Maps uses the PROJ library to support mostcoordinate systems.

The default online base maps used by SW Maps has limited maximum zoom. If you have high resolutionimagery layers, or are collecting points very close to each other, you'll want to zoom in further onthe map.

SW Maps layers are added by copying the files to the corresponding layer folder on your device. Thereis one folder for every layer type.For Android 10 and earlier: "SW_Maps/Maps" folder on your device storage.

You can set the minimum GNSS fix quality for recording in the app settings. This will prevent recording of low quality data. For example, setting minimum fix quality to RTK Fix will prevent RTK float points from being recorded.

The BKG Ntrip Client (BNC) is an Open Source multi-stream client program designed for a variety of real-time GNSS applications.
It was primarily designed for receiving data streams from any Ntrip supporting Broadcaster. The program handles the HTTP communication and transfers received GNSS data to a serial or IP port feeding networking software or a DGPS/RTK application. It can compute a real-time Precise Point Positioning (PPP) solution from RTCM streams or RINEX files. During the last years BNC has been enriched with RINEX quality and editing functions. You can run BNC with GUI as well as in batch processing mode.

*shared means that Qt5 needs to be installed on your system. All Linux binaries have been compiled with these Dockerfiles.
See also here for all BNC downloads, including checksum files.
For suggestions or bugs please open a ticket at software.rtcm-ntrip.org/wiki. JavaScript seems to be disabled in your browser.
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