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A Grid Point Search Algorithm (GRIPSA) for fast integer ambiguity resolution is presented. In the proposed algorithm, after
the orthogonal transformation of the original ambiguity parameters, the confidence ellipsoid of the new parameters is represented
by a rectangular polyhedron with its edges parallel to the corresponding axes. A cubic grid covering the whole polyhedron
is then identified and transformed back to the original coordinate system. The integer values of the corresponding transformed
grid points are obtained by rounding off the transformed values to their nearest integer values. These values are then tested
as to whether they are located inside the polyhedron. Since the identification of the grid points in the transformed coordinate
system greatly reduces the search region of the integer ambiguities, marked improvements are obtained in the computational
effort.
Received: 13 October 1997 / Accepted: 9 June 1998 相似文献
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Kondrat'eva I. A. Maksimova I. G. Nad”yarnykh G. I. 《Lithology and Mineral Resources》2004,39(4):333-344
Application of f-radiography for the study of ore-bearing rocks of the Malinov uranium deposit revealed the following specific features: (1) occurrence of uranium in both authigenic and terrigenous components; (2) important role of fine–dispersed (mineral-free) mode of uranium occurrence; and (3) participation of different-aged epigenetic processes in the ore formation. The sequence of ore formation and transformation in this deposit is similar to that in the Semizbai deposit. Therefore, they can be united into a single subtype of Mesozoic infiltration deposits in western Siberia. 相似文献
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An adaptable equal-area pseudoconic map projection 总被引:1,自引:1,他引:0
Daniel “daan” Strebe 《制图学和地理信息科学》2016,43(4):338-345
Equivalence (the equal-area property of a map projection) is important to some categories of maps. However, unlike conformal projections, completely general techniques do not exist for creating new, computationally reasonable equal-area projections. The literature describes many specific equal-area projections and a few equal-area projections that are more or less configurable, but flexibility is still sparse. This work describes a new, highly configurable equal-area projection system consisting of arcs of concentric circles, placing it in the pseudoconic class. The system uses a novel technique to hybridize the Bonne pseudoconic projection and the Albers conic projection, subsuming many existing projections as degenerate cases. With the resulting system and the technique used to develop it, map projection designers will have greater choice in tailoring the projection to the need. The system may be particularly suited to maps that dynamically adapt to changing scale and region of interest, such as required for online maps. 相似文献
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Daniel “daan” Strebe 《制图学和地理信息科学》2013,40(3):260-276
ABSTRACTSometimes map projection designers need to create equal-area projections to best fill the projections’ purposes. However, unlike for conformal projections, few transformations have been described that can be applied to equal-area projections to develop new equal-area projections. Here, I survey area-preserving transformations, giving examples of their applications and proposing an efficient way of deploying an equal-area system for raster-based Web mapping. Together, these transformations provide a toolbox for the map projection designer working in the area-preserving domain. 相似文献
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O. V. Yapaskurt O. V. Postnikova V. V. Poshibaev A. D. Iz”yurov N. K. Danilko 《Lithology and Mineral Resources》2017,52(5):401-412
The stagewise optical and electron-microscopic analysis of the texture and mineralogy of the Upper Riphean–Lower Vendian gravelly–sandy rocks (Taseeva Group) in the Irkineevo–Chadobetsk riftogenic trough revealed a wide spectrum of secondary transformations: gravitational corrosion of allothigenic minerals, their plastic deformation, intense fracturing, and authigenic mineral formation. Traces of low-temperature hydrothermal processes were recorded. The multistage nature of authigenic mineral formation is attributed to the periodic resumption of tectonic dislocations owing to reactivation of fluid dynamics and thermal impulses ΔT. 相似文献
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Cuoco Emilio Minissale Angelo Di Leo Antonella “Magda” Tamburrino Stella Iorio Marina Tedesco Dario 《International Journal of Earth Sciences》2017,106(7):2429-2444
International Journal of Earth Sciences - The geochemistry of natural thermal fluids discharging in the Mondragone Plain has been investigated. Thermal spring emergences are located along the... 相似文献
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We analyze the dependency of the GPS positioning precision on station location in an idealized positioning environment. Using
a weighting function to account for an averaged number of satellites at different latitudes, we demonstrate that GPS positioning
precision for ambiguity fixed solutions reduces when the latitude increases. We also quantify that the positioning precision
in the north-south direction is worse than that in the east-west direction at all latitudes using the same approach.
Electronic Publication 相似文献