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#1 2021-01-17 00:37:11
- Alexey Vazhnov
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- From: Wrocław, Poland
- Registered: 2009-09-01
- Posts: 134
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Wrocław: high precision GNSS tracks
I'm creating GPX tracks near Wrocław, because some of villages have no any track available to check satellite imagery offset.
I found that Wrocław has a station LEICA GR50 from ASG by EUPOS: http://www.asgeupos.pl/index.php?wpg_ty … sub=ref_st
How can I use the signal of this station to create high quality GPX tracks?
Should I use any of RTKLIB-compatible GPS devices?
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#2 2021-01-17 14:44:37
- Mateusz Konieczny
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- Registered: 2013-09-22
- Posts: 2,130
Re: Wrocław: high precision GNSS tracks
Note that in Poland geoportal.gov.pl aerial imagery is so good that it can be used to align other aerial imagery.
How can I use the signal of this station to create high quality GPX tracks?
Should I use any of RTKLIB-compatible GPS devices?
Sadly I have no idea at all here
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#3 2021-01-17 15:09:27
- RicoElectrico
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- From: Trójmiasto
- Registered: 2012-07-01
- Posts: 1,700
Re: Wrocław: high precision GNSS tracks
ASG-EUPOS is now a paid service. It was free only in the beginning.
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#4 2021-01-18 23:53:14
- Alexey Vazhnov
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- From: Wrocław, Poland
- Registered: 2009-09-01
- Posts: 134
- Website
Re: Wrocław: high precision GNSS tracks
Sad. I need accurate GNSS tracks not for checking satellite imagery offset only, but also for example to create good quality image sequences for Mapillary.
So, as an alternatives:
Buy device with multiband GNSS (L1 + L5 GPS)
Buy some RTK kit (SparkFun / u-blox ?), create own station and share diff into internet.
Buy temporary access from, for example, https://www.tpinet.pl/kup-dostep
First step looks good. Anyway I need more accurate GNSS to work with RTK.
Any other idea?
Last edited by Alexey Vazhnov (2021-01-19 00:05:52)
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#5 2021-03-07 15:06:37
- Alexey Vazhnov
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- From: Wrocław, Poland
- Registered: 2009-09-01
- Posts: 134
- Website
Re: Wrocław: high precision GNSS tracks
I've ordered from digikey.pl:
SparkFun GPS-RTK-SMA ZED-F9P BREAKOUT — board with u-blox ZED-F9P
U-Blox ANN-MB-00-00 — active antenna, IP67
But there was no metal ground plane which is highly recommended by u-blox. I hope, any piece of metal will be fine for this.
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#6 2021-03-26 10:52:19
- Alexey Vazhnov
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- From: Wrocław, Poland
- Registered: 2009-09-01
- Posts: 134
- Website
Re: Wrocław: high precision GNSS tracks
My precious arrived!
I had to pay import tax 290 PLN in addition to shop price 1170 PLN…
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#7 2021-03-26 11:54:45
- RicoElectrico
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- From: Trójmiasto
- Registered: 2012-07-01
- Posts: 1,700
Re: Wrocław: high precision GNSS tracks
That's quite a lot of money.
Do you know of any cheap standalone L1+L2 receivers? In open sky conditions they are pretty good, as tested by some Xiaomi phone users on our FB group.
But I don't want to buy a phone just to record tracks.
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#8 2021-03-26 12:10:15
- Alexey Vazhnov
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- From: Wrocław, Poland
- Registered: 2009-09-01
- Posts: 134
- Website
Re: Wrocław: high precision GNSS tracks
Do you know of any cheap standalone L1+L2 receivers?
I don't know.
I saw some cheap "multiband" modules on aliexpress, but I don't believe they are really multiband. I think it is better to take some old used u-blox NEO-M8* / NEO-M9* modules than to buy fake "multiband" module with unknown precision. As I understand, it is better to use L1 receiver with correction than multiband receiver without correction data.
You can take a look at https://rtklibexplorer.wordpress.com , he is "exploring precision GPS/GNSS with RTKLIB open source software and low-cost u-blox GNSS receivers".
Also you can take my module when you need it. I'm in Wrocław
Last edited by Alexey Vazhnov (2021-03-26 12:12:33)
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#9 2021-03-26 12:22:58
- SK53
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- Registered: 2009-01-11
- Posts: 598
Re: Wrocław: high precision GNSS tracks
People I know on OSM using RTK include Jean-Guilhem Caiton (jgc) with ublox modules in France & in the UK both Russss and Firefishy have recently acquired them. There's also a thread in this forum in Russian on RTK. It's possible that sharing experience & advice would be useful. I felt that perhaps this was something a national association could invest in: however, in the UK we now have accurate open data on cadastral parcels which fulfills the purpose of high-quality image alignment.
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#10 2021-03-31 13:17:40
- MikeN
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- Registered: 2009-09-03
- Posts: 326
Re: Wrocław: high precision GNSS tracks
I used a US 1 gallon paint can lid as the ground plane. It is very close to the recommended size.
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#11 2021-04-04 09:17:10
- Alexey Vazhnov
- Member
- From: Wrocław, Poland
- Registered: 2009-09-01
- Posts: 134
- Website
Re: Wrocław: high precision GNSS tracks
I used a US 1 gallon paint can lid as the ground plane. It is very close to the recommended size.
I'm using something similar, thank you!
I solved problem with GPSBabel: https://help.openstreetmap.org/question … -by-radius
So now I have a script to convert all NMEA files into one GPX and filter them to remove some noise.
I'm satisfied with a quality of tracks even without correction. Maybe I will not use a correction, because wrong correction can create a align for all tracks (am I right in this?).
My current setup:
Receiver SparkFun GPS-RTK-SMA ZED-F9P
IP67 active antenna: U-Blox ANN-MB-00-00, with 5 meters cable…
Single board computer: i.MX53 Quick Start board (1 GB RAM), it uses 5V x 0.3-0.5A when running
Noname powerbank with 3x18650 and controller TPOWER TP4366
Rainproof bag https://www.sportarsenal.cz/brasny/art--310/
Ta-da! Here are the tracks: https://www.openstreetmap.org/user/Alex … %20zed-f9p
Started a wiki-page: https://wiki.openstreetmap.org/wiki/Use … NSS_traces
TODO:
Better metal ground plane
Current setup spends whole bag, I need to make it more compact
Better power supply: my SBC can eat more than 1A when initializing, and my powerbank switches off sometimes on start
Replace SBC with a simple logger
Add Bluetooth to have connection with Android smartphone
Last edited by Alexey Vazhnov (2021-04-04 16:35:38)
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