Reference Grid


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Reference Grid

 

in topography, the grid of coordinate lines x = const and y = const on topographical maps made using the Gauss-Krüger projection. The lines of the reference grid are parallel to the central or axial meridian of the zone, which is taken as the x axis in the given coordinate zone, or they are parallel to the equator, which serves as the y axis for all analogous zones. These lines are inflected relative to the frames of the map at an angle equal to the convergence of the meridians. The numerical values of the lines of the reference grid are given at the points where they leave the frame of the map sheets. The values of x are counted from the equator to the poles, and the values of y are counted from the axial meridian of the zone, which is arbitrarily assigned a value of 500 km (for obtaining positive values of y within the boundaries of the entire zone). The reference grid is sometimes called the kilometer grid.

References in periodicals archive ?
The first experiment included an independent reference grid called a "phantom" and a number of square pieces of different silicone liner materials.
Preconditions for comparing and evaluating variations in socket shape and volume are first, that a fixed reference grid exists and second, that the image is not influenced by mechanical shift.
This base volume is referred to as the selected reference grid. As a result, the possibility exists to relate different wrap casts of the subject to underlying anatomical coordinates for the first time.
Researchers may be able to extract the bone structure, which is a solids volume procedure, and use it as a reference grid for 3-D alignment of multiple image volumes.
This study explored the potential of MRI technology for establishing a reference grid for prosthetic socket research.
This study demonstrated that quantifying differences in casting shape with the tibia as a reference grid is feasible.
The perspective distortion attributable to FOV-GFOV differences was evidenced mainly by distortions of the target cube and reference grid.
These results suggest that it may not be necessary to use reference grids and drop lines within a perspective stereoscopic display, eliminating a potential source of display clutter.
The classified satellite information was then digitally compared with the exposed soil/non-exposed soil reference grid that was derived from the aerial photography.
By using the digital reference grid derived from aerial photography, we could base our comparison using thousands of grid cells.
Conservative bias in classification accuracy assessment due to pixel-by-pixel comparison of classified images with reference grids. Int.
On March 12, 2014 the MassCIP Steering Committee authorized the release of a Request for Responses to develop a resource guide and quick reference grid on federal and state laws that govern information sharing and confidentiality laws for Juvenile Dependency Matters.

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