New answers tagged gps
From my research on the WWW, the best cheapest working solutions seems to be the REACH at the moment (December 2015). They have RTK kit for $570 available. The board is the successor of NAVIO and the NAVIO+ board.
From my experience, the ring is larger in areas with more interference, etc. Using Collector in an open field, my location is pretty spot on. If there are a lot of buildings, power lines or other items that may interfere with the signal, the ring is larger and points are close, but not necessarily on target.
Collector will utilize the GNSS positional data provided by the GNSS (any real-time correction..SBAS, RTK, etc.). I have used the Leica Zeno 20 with Collector and can confirm that this configuration is providing 1cm level accuracy when storing features within the Collector app. As for the blue ring and how it relates to the accuracy of the solution, I am not ...
Did you have a look at this plugin in https://plugins.qgis.org/plugins/GeoCoding/ I'm very new to qgis so haven't tried it yet
All sounds sensible to me but depending on what your overall aim is you might want to split long segments into shorter ones of equal length, as links in road network can be anywhere from 2 metres to 10 miles long so your spatial resolution will vary enormously (unless it is the link itself you are interested in, which for a pollution problem seems unlikely). ...
Given that you know R you should have made a small reproducible example, but here you go. xy <- data.frame(matrix(c(8.58, 10, 11, 10.27, 10.69, 51.52, 52.26, 51.4, 50.9, 49.43), ncol=2)) library(sp) colnames(xy) <- c('lon', 'lat') coordinates(xy) <- ~ lon + lat proj4string(xy) <- CRS("+proj=longlat +datum=WGS84") p <- spTransform(xy, ...
I think you need both coordinates to calculate the distance. For one coordinate further need to know the angle\azimuth.
I can't help you with a recursive query. Instead you can use two window functions. In the inner query dist the distance between two neighbour points are calculated. In the inner query sum the total distance from point A to a the actual point is calculated. The last step is to filter out points with a distance over 1km. The query: select * from ( ...
I'm not sure, but I don't think so. The collector app is more lightweight but pretty robust. You maybe able to do it in a map app within the browser, by using geographic query, but not sure whether the map app reads the GPS of the Mobil device
You can use mission planning tools where for a defined location you can input obstructions using bearing and elevation. You will then be able to see how these obstructions affect satellite availability and the GDOP (Geometric Dilution Of Precision). GDOP value is very important to know if the geometry of the visible satellites is good to achieve a reliable ...
For Trimble RTK and rovers a minimum of 4 satellites must be tracked to obtain RTK coordinate solutions. With 5 common satellites necessary for RTK initialization. The Global Position System (GPS) is designed so at least 5 satellites are above the horizon at all times, but there can be 8 or more during some times of the day. See here for more information ...
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