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Combining Terrestrial Reference Frames (TRFs) to frames of superior quality (like the ITRF) usually involves homogenisation by an empirical weighting scheme. Different approaches on variance component estimation have been evaluated for this purpose. The statistically rigorous Helmert estimator has been compared with two other methods: the degree of freedom method and a simplified, approximate estimator. Tests have been performed, covering two elementary types of combinations.
Reference Systems --- VLBI --- Geodesy --- SLR --- GPS --- Least Squares Adjustment --- Variance Component Estimation --- ITRF
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The present book contains ten articles illustrating the different possible uses of UAVs and satellite remotely sensed data integration in Geographical Information Systems to model and predict changes in both the natural and the human environment. It illustrates the powerful instruments given by modern geo-statistical methods, modeling, and visualization techniques. These methods are applied to Arctic, tropical and mid-latitude environments, agriculture, forest, wetlands, and aquatic environments, as well as further engineering-related problems. The present Special Issue gives a balanced view of the present state of the field of geoinformatics.
Research & information: general --- Geography --- mosaicking --- urban image --- seamline determination --- deep learning --- D-LinkNet --- climate change --- evergreen plants --- extreme events --- flavonol and chlorophyll sensor (Dualex) --- greenness indices --- mosses --- near-remote sensing active and passive NDVI sensors --- Sentinel-2 --- subarctic vegetation damage --- crop growth --- reflectance saturation --- crop model --- assimilation --- crop growth stage --- method combinations --- sentinel-2A image --- UAV image --- remote sensing --- soil salinity --- Love/Shida numbers --- satellite laser ranging (SLR) --- Yarragadee station --- Mount Stromlo station --- LAGEOS --- STELLA --- STARLETTE satellites --- SLR stations coordinates --- ITRF2014 --- Lake Ladoga --- CMEMS GlobColour CHL-OC5 --- eutrophication --- water quality assessment --- pulp and paper mill --- ecological status --- phytoplankton and chlorophyll-a --- chemical wastewater pollution --- ArcGIS --- big data --- blueberries --- image analysis --- orthomosaics --- segmentation refinement --- UAVs --- HAPS --- UAV --- monitoring --- constrained multiple objective optimization --- temporal hierarchical task planning --- GNSS stations --- tectonic plate motion parameters --- ITRF --- vegetation monitoring --- drivers of deforestation --- Zambezi region --- land degradation --- vegetation cover change --- wildlife management --- TSS-RESTREND --- greening and browning --- MODIS --- Mann–Kendall --- n/a --- Mann-Kendall
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