Results 111 to 120 of about 21,612 (157)

A compromise aspect-adaptive cylindrical projection for world maps

International Journal of Geographical Information Science, 2015
There are two problems with current cylindrical projections for world maps. First, existing cylindrical map projections have a static height-to-width aspect ratio and do not automatically adjust their aspect ratio in order to optimally use available canvas space. Second, many of the commonly used cylindrical compromise projections show areas and shapes
Bernhard Jenny, Bojan Šavrič
exaly   +2 more sources

Second derivative of displacement on cylindrical shells by projection moire

Applied Optics, 1989
We describe a new method, based on projection moire, in which fringes relate directly to the second derivative of displacement. The method was applied to a cylindrical shell segment. The experimental results obtained with the new method were found to be in good agreement with strain gauge measurements.
J, Politch, S, Gryc
exaly   +3 more sources

Projection lithography onto overall cylindrical surfaces

Microelectronic Engineering, 2006
Projection lithography onto overall surfaces of cylindrical and conic specimens was investigated to form precise groove patterns on various curved mechanical parts. Fine grooves on shafts or cylinders are required for developing air-bearings, encoders, lubricant supply routes and other micro-systems.
Toshiyuki Horiuchi
exaly   +2 more sources

Bounds for cylindrical projection codes

[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications, 2003
Some methods for analyzing the error performance of cylindrical projection codes are proposed. The main features of these methods are the use of combinatorial generating functions to obtain the weight distribution of a cylindrical projection code, and the use of the weight distribution of a cylindrical projection code to obtain the upper bound and ...
G. Yang, D. Li, D.L. Schilling
openaire   +1 more source

CYLINDRICAL MAP-PROJECTIONS

Empire Survey Review, 1934
Abstract IT was customary at one time to regard cylindrical projections as degenerate and inferior types of conical projections, but in recent years the former have generally been preferred to the latter.
openaire   +1 more source

A COMBINED CYLINDRICAL PROJECTION

Survey Review, 1939
AbstractThe projection in question is a mean between Mercator's and the Equal-Area Cylindrical Projection which is formed by orthographic projection from the sphere upon the circumscribing cylinder. Both projections are computed on the spherical assumption.
openaire   +1 more source

Double projective cylindrical texture mapping on FPGA

Proceedings of the 2006 ACM international conference on Virtual reality continuum and its applications, 2006
Image-based modeling and rendering (IBMR) techniques have been used to construct three-dimensional virtual scenes applied for VR applications by warping several two-dimensional images with depth information. In this paper, a novel approach of IBMR with depth information called double projective cylindrical texture mapping method (DPCM) is presented and
Xiaoying Li, Baoquan Liu, Enhua Wu
openaire   +1 more source

Modified perspective cylindrical map projection

Arabian Journal of Geosciences, 2013
Some of the famous cylindrical projections are defined by a geometric process that is based on the perspective. This process can be imagined as a semitransparent sphere wrapped by a tube, secant, or tangent, with the same center; then all features of the sphere surface are projected onto the tube surface by light rays from a source in the equatorial ...
Ahmad H. Alashaikh, Hasan M. Bilani, Abdullah S. Alsalman   +2 more
openaire   +1 more source

An Improvement of the Projection Operator in Cylindrical Algebraic Decomposition

Proceedings of the international symposium on Symbolic and algebraic computation, 1990
The Cylindrical Algebraic Decomposition (CAD) method of Collins [5] decomposes r-dimensional Euclidean space into regions over which a given set of polynomials have constant signs. An important component of the CAD method is the projection operation: given a set A of r-variate polynomials, the projection operation produces a set P of (r - 1)-variate ...
openaire   +1 more source

Cylindrical projection conformality of triaxial ellipsoid

Doklady Earth Sciences, 2013
It is proved that the projection of a triaxial ellipsoid with rectilinear meridians orthogonal to the rectilinear equator cannot be strictly conformal. The proof is based on the fact that due to the degeneration of the horizontal coordinate in latitude the relation between arc differentials in the projection depends linearly on the relation between the
M. E. Fleis, M. V. Nyrtsov, M. M. Borisov   +2 more
openaire   +1 more source