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The short of it is--there's no way to measure infinite points on your DEM and determine its HV accuracy, but a decent sampling should tell you if you're in the ballpark based on whatever accuracy requirements you're striving for. All elevation data works this way. radouxju's answer is on the money as far as the statistics goes. The best way to measure ...


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The the accuracy refers to the absence of bias. So you can estimate your accuracy as the mean of the difference between yout two datasets. It is often difficult, and sometimes impossible, to distinguish horizontal from vertical bias. However, it is possible if you are in a rugged terrain. Alternatively, you can directly work in 3D for your displacement, but ...


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The Define Projection tool only changes the associated projection, it does not modify the geometry of the feature or shapefile. (Useful if you get data with no associated projection. Not useful if you're trying to transform to a different coordinate system.) Since you ran this before running Project (which mathematically transforms the data into a different ...


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Quoted from About coordinate systems and map projections Other projections minimize overall distortion but don't preserve any of the four spatial properties of area, shape, distance, and direction. The Robinson projection, for example, is neither equal area nor conformal but is aesthetically pleasing and useful for general mapping. You may want ...


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I write this html script for you from this formule, x and y are taken from your example. Edit : This code was written for your previous question in which you are looking for a javascript code (This question has been deleted). I'm sorry if I'm off topic and I hope this code will help you anyway. <!DOCTYPE html> <html> <head> ...



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