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The OS contour lines of my local rides are pretty macro
and the lidar
https://houseprices.io/lab/lidar/map
has been scrambled by the tree cover.
Just wondering if the new Galileo satellites will provide accurate elevation recording on a smart phone
That looks pretty boring. Then you zoom in!
Scotland seems to have fallen off.
Scotland seems to have fallen off.
Not again!
maccruiskeen - MemberScotland seems to have fallen off.
We're on the european version
What am I looking at?
Is that a LIDAR map of (some parts of) UK taken by the Galileo satellites?
legend - Member
maccruiskeen - Member
Scotland seems to have fallen off.We're on the european version
How do find the European version?
How do find the European version?
Sadly we lost access to that website on 23rd June. Woe is me.
The detail is pretty cool, I can find my house. I still don't really understand what it is though, or why bits are missing
there are no location labels, how are you supposed to know where's where?
That is very cool.
I found my house by looking for landmarks. Started off finding london, then the M25, then the M3 junction, then followed that to the A322 and then found where the A322 hit the basingstoke canal - my village.
The link is to LiDAR data taken by the Environment Agency (hence only England and Wales) recently made publicly available under Creative Commons (see one level up on the webpage). It looks like the DSM (not DTM, so its not corrected for buildings, trees etc because the website is about houses). It's not taken by satellite, it's taken from aircraft.
The DTM is freely available [url= https://data.gov.uk/dataset/lidar-composite-dtm-1m1 ]here[/url]. (Q-GIS is freeware GIS that can visualise the data)
But to the OP's question
Just wondering if the new Galileo satellites will provide accurate elevation recording on a smart phone
The simple answer is probably not. Firstly, the formal accuracy of Galileo won't be much different to GPS/GLONASS currently used. Secondly, if you are talking about an app that records your route and then gives you an elevation profile, they generally don't use the elevation directly from GNSS, they use a DTM. I presume thats why you pointed to the LiDAR.
So in those apps you get a combination of both DTM errors and GNSS horizontal positioning errors. Galileo aims to provide free access to ~1m accuracy in horizontal positioning, which is very similar to the civilian (free) GPS you currently get. Most low cost antennae / receivers, like the ones in smart phones, work to a horizontal accuracy more like 15m giving a vertical accuracy of perhaps 25m. A specific DGPS device like Garmin quote vertical accuracy of 10m. Much larger errors do occur, usually due to where you are (in a city / behind a hill) and where you put your phone (in a pocket). So given the majority of the positioning error comes from quality of the receiver and the intricacies of range estimation, I don't think Galileo will improve on the accuracy you currently get on your smart phone.