14

I think this XKCD is a perfect answer to this question :) https://xkcd.com/2170/


4

If you project your dataset from WGS84 to a projection with meters as the unit of measure you should be fine with doing the steps you've described above. To do this, right click on the layer in the Layer Panel, then choose 'Export'. You can export as a number of filetypes, including .csv if you want to stay in that format. Choose a projection in the dialog ...


4

Regarding Position Errors The ATS Wildlink 500 ("ATSW500") outputs what is known as autonomous positions. The errors of autonomous positions are normally distributed if and only if (1) the device (actually the antenna) is static, i.e., it stays in exactly the same place, and (2) over a period of duration, e.g., several hours, and (3) you are logging ten ...


3

Typically, we do not use the number of satellites alone as a measure of precision or accuracy of GPS data. I do not know of any direct mathematical relationship that would link the two, and it would depend on the receiver as well. If you really wish to find a relationship, you would have to conduct a study with your collars and see if there is a correlation ...


2

The precision of GNSS devices is indeed usually given in RMS. Trimble is not an exception. In your case, you would have 63% of confidence that your point is located within an horizontal circle of radius 4 m around the measured position. And 68% confidence that your elevation is within +/- 10 m from the measured one. PDOP of 2 is quite good, so you can expect ...


2

In theory, any Equal Area projection will preserve a constant areal scale, all over the map. Customizations, as you have found, allow you to modify the contact point or line, position, orientation, etc, but should not change the fundamental geometric property of consistent areal scale, only the appearance of your map. That is why your column F values are ...


1

GPS accuracy varies based on several parameters, most important the number of satellites you can get signals from, and their geometric distribution on the sky. Some factors affecting this are: Line-of-sight. You need line-of-sight to the satellites to get any useable signals. Different locations will have different horizons (i.e. a hill, mountain or ...


1

Mapbox Vector Tiles appear to lack accurate intersection nodes. Is this a bug? I.e. should the tile's geojson include a shared node between two intersecting streets? This is likely not a bug, but a consequence of the fact that OpenStreetMap does not have a strict node-edge topology for road networks, with each segment of road starting and ending at each ...


1

Accuracy and precision depend on many factors, including the device and the clarity of the signal received. I'm answering based on the assumption that the device used is not supported by additional signalling equipment on the ground (with known locations). The signal from the GPS satellites is cleaner if it arrives directly at the device without ...


1

Is my point cloud inaccurate because it's not LiDAR? Not exactly. All types of point clouds (from laser scanning, stereo images, etc) can have varying degree of accuracy, resolution, type of information, etc. You can try the following to generate a better output: Check for outliers. First thing, check if the point cloud has any type of outliers. If it ...


1

Here are some suggestions to test and try improving the processing workflow. Outliers The 'white specs' seem to be a consequence of having outliers in the raw point cloud. Have you checked them? You can look at the Las Dataset Properties, column 'Z Max' (see here). In case you find them, take a look at: Deleting anomalous points in *.lasd using ArcGIS ...


1

Google Earth Engine has all the functionality you need to do any of the following of your workflow (and much more): Visualize imagery Generate training data Supervised classification Perform an accuracy assessment


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