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How to transfer GPS heights into normal heights has become a hotspot in survey engineering. There are many GIS fitting methods adopted in GPS heights conversion. A solution is sought the points where collocated by GPS (getting h) and geometry leveling (getting H) in certain area, and we could get the values of Quasi-geoid of these points. We call these points GPS/leveling points, namely the known...
Interpolation is the process of defining a function that takes on specified values at specified points, which can be viewed as a function for estimating the heights of unknown points using a set of proper known points' data. Any interpolation approach is based on the changes of original hypsography and getting continuous smoothness, we also could say that neighbor points having large relationship...
We need to separate GPS height area Quasi-geoid into several parts when transforming GPS height in a large area, and the height abnormal precision on the unknown points is related deeply to the distribution of the known points, the paper puts forward that we should separate GPS height area for every unknown point in order to obtain higher precision, therefore, it will take much time and energy to...
Conversion of GPS heights into normal heights has become a hotspot in survey engineering, the Quasi-geoid surface can be very complicated especially in a large survey area or in complicated terrain, just adopting several GPS/leveling points to construct quadric surface model to fit the Quasi-geoid surface has some limitations, precision could not be guaranteed. So, such demand us that we should partition...
How to transfer GPS heights into normal heights has become a hotspot in survey engineering. With the development of computer and information technology, artificial neural networks (ANN) has been used widely, which has the character of the high parallel distributed processing, associative memory abilities, self-organization, self-learning and strong nonlinear mapping abilities, and the theory has proved...
GPS height conversion into normal heights has become a hotspot in survey engineering. Many Researches and applications have proved that the Quasi-geoid surface can be very complicated especially in a large survey area or in complicated terrain, just adopting several GPS/leveling points to construct quadric surface model to fit the Quasi-geoid surface has some limitations, precision could not be guaranteed...
Polynomial fitting method is widely used in GPS height conversion into normal heights in survey engineering and whcih has become a hotspot. Different models used in different area of interpolation have different precisions, therefore, it is very important to optimize model before GPS height conversion in order to obtain high precision. Lots of engineering practice has proven that The conicoid model...
Artificial neural networks (ANN) has been used in GPS heights conversion. It is impossible to avoid gross errors in conversion of GPS heights. So, the paper puts forward a kind algorithm to detect gross error considering of ANN used in conversion of GPS heights. After the three tests, the algorithm proposed for disposing of gross error is validated in conversion of GPS heights, and some practicable...
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