The present paper presents a geodetic datum transformation between the old and new national coordinate reference systems of Slovenia. The basis for transformation is a set of about 2000 points coordinated in both systems. Virtual tie points are used, which form a regular triangular network covering the entire country. In order to enable extrapolation, the network was expanded, thereby reducing its density. Coordinate shifts between both coordinate systems were determined using best-fit transformation in the immediate neighbourhood of each virtual tie point. Weights assigned to these points depend upon their density and distance from the virtual tie point. The results prove significant advantages of the proposed model: high accuracy, minimisation of distortions, continuity and reversibility of transformation. Therefore, the model has been chosen for transformation of all spatial databases which continuously cover the entire territory of the country and require transformation accuracy of better than one metre.
The Central European GNSS Research Network (CEGRN) collects GNSS data since 1994 from contributors which today include 42 Institutions in 33 Countries. CEGRN returns a dataset of coordinates and velocities computed according to international standards and the most recent processing procedures and recommendations. We provide a dataset of 1229 positions and velocities resulting from 3 or more repetitions of coordinate measurements of each site over 4 or more years. The velocity data result from a combination of eight multiyear, partially overlapping networks, using 234 stations of class A of the European Permanent Network (EPN) for alignment to the ‘European Fixed’ ETRF2000 Reference Frame. The rms (root mean square) of the 8 individual contributions to the combined solution, after a 7 – parameter Helmert transformation, is less than 5 mm in the observation period 1996–2017. This combined CEGRN network maintains the origin coincident with that of the ETRF2000 reference frame to within 1.8 mm rms for the entire period of analysis. The mean positions and velocities of common EPN Class A and CEGRN stations differ by 0.0 ± 1.1, 0.5 ± 1.0 and 0.1 ± 2.7 mm for the coordinates and 0.06 ± 0.13, -0.07 ± 0.12, 0.38 ± 0.28 mm/yr for the velocities respectively for the North, East and Up components at epoch 2010.0.
UVODAerolasersko skeniranje (v nadaljevanju: ALS), v tuji literaturi imenovano airborne laser scanning (ALS) oziroma aero lidar, je metoda daljinskega zaznavanja, ki je v dobrih dveh desetletjih, kolikor so na trgu komercialni sistemi, postala najtočnejša metoda daljinskega zajema podatkov o zemeljskem površju (Liu, 2008). Aerolasersko skeniranje je vedno bolj uveljavljen način za zajem podatkov za tvorbo kakovostnega digitalnega modela višin (v nadaljevanju: DMV), ki je primeren tudi za najzahtevnejše uporabnike.Kakovost DMV, ki ga lahko delimo na digitalni model reliefa (v nadaljevanju: DMR) in digitalni model površja (v nadaljevanju: DMP), je še posebej pomembna pri upravljanju voda. Za
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