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Decreased vertical precision is an artefact of measurement geometry more than e.g. number of frequencies. Horizontal position has the benefit of having satellites at almost all azi…

There is a lot of talk of military uses here, but this technique is also used for environmental monitoring. GNSS interferometric reflectometry (GNSS-IR) uses navigation satellites …

Oh wow, cool to see this on HN! I'm a postgraduate researcher working on GNSS interferometric reflectometry (GNSS-IR), a related but slightly different technique. I'll shout out th…

You've got exactly the right idea, except "cross compare" is underselling it :) Here's a previous thread on this topic[0]. For each (receiver, satellite) pair, you can calculate th…

Maybe a global Moran's I test? https://en.m.wikipedia.org/wiki/Moran%27s_I Create the spatial weights matrix with great circle distances?

Aerial survey LiDAR can process multiple returns from a single laser pulse. So, some energy might be reflected back from a leaf, but some energy will pass through (or around) the l…

A raw point cloud is run through a series of processing steps to label each point with a class, e.g. "Ground", "Low/Medium/High Vegetation", "Building", "Transmission Tower", etc. …

I went through a similar process recently while building a solar powered Raspberry-Pi based GNSS receiver. (like the OP) I originally looked at a very low power/speed GPIO modem, b…

It's functionally equivalent to an RTK base station (the configuration script I'm using is even called "RTKbase"[0]), but it's being used for researching GPS-based soil moisture re…

I'm running a Raspberry Pi based GNSS receiver from a 26 Ah SLA battery and an 80W panel. Just passed 2 weeks of uptime in a cloudy period of southern hemisphere autumn. A monte ca…

To expand upon this: >> They're measuring it by looking for phase differences in the received L-band (~2GHz) signals The "L-Band signals" are GNSS signals, for example GPS L1 and L…

Is paid software OK? Have you looked at Revit?

This comment made me curious. Apparently, TAI specifically defines the second (in terms of cesium transitions) at sea level (where gravitational potential is equal). I never knew t…

If you want to go further down the LIDAR path, you might be able to improve the public data by making manual improvements to the point cloud classification. For that sort of terrai…

https://archive.is/MgHXB