Assumed Meridian
Assumed Meridian - Related Videos
01:28
Meridians
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2025
In surveying, meridians are vital reference lines to measure directions and establish accurate land orientations. Meridians run from the north to the south poles, providing a stable framework for angular measurements and mapping. Meridians are fundamental in survey design, with the primary types being astronomic, magnetic, and assumed meridians. Each type offers distinct benefits and limitations, selected based on the project's scale and precision needs.The astronomic meridian is aligned with...
04:03
Alternative Therapy for Acute Exacerbation of Chronic Obstructive Pulmonary Disease: Moving Cupping Along Meridians
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2024
This protocol presents a novel approach to alleviating the symptoms and improving the quality of life of patients with acute exacerbations of chronic obstructive pulmonary disease (AECOPD) by employing moving cupping along meridians therapy to stimulate the first sideline of the bladder meridian.
06:43
A Standardized Copper Bian-Stone Gua Sha Protocol for Treating Chronic Fatigue Syndrome in Human Subjects
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2026
This protocol describes a standardized, step-by-step procedure for performing copper Bian-stone Gua Sha in human subjects diagnosed with chronic fatigue syndrome. The technique involves the application of a copper alloy scraper to specific meridian pathways (Governor Vessel and Bladder Meridian) and designated acupoints. Representative pre- and post-intervention observational data are included to illustrate the procedural workflow and data collection methods.
09:43
Measuring Reaction Time and Donders' Method of Subtraction
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University The ambition of experimental psychology is to characterize the mental events that support the human ability to solve problems, perceive the world, and turn thoughts into words and sentences. But people cannot see or feel those mental events; they cannot be weighed, combined in test tubes, or grown in a dish. Wanting to study mental life, nonetheless, Franciscus Donders, a Dutch ophthalmologist in the early 1800s, came up with a...
10:06
High-resolution Functional Magnetic Resonance Imaging Methods for Human Midbrain
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Cited by 8 •
2012
This article describes techniques to perform high-resolution functional magnetic resonance imaging with 1.2 mm sampling in human midbrain and subcortical structures using a 3T scanner. Use of these techniques to resolve topographic maps of visual stimulation in the human superior colliculus (SC) is given as an example.
FAQs
The assigned bearing acts as the computational starting point for the survey. Once that value is fixed, each measured horizontal angle is referenced to the same line, so bearings for traverse lines, boundaries, and site features remain internally consistent. Changing the starting bearing would change the numerical bearings, but not the local angular relationships represented by the survey.
An Assumed Meridian is useful when the survey requires dependable local direction rather than a globally oriented bearing. Unlike a true meridian, it does not depend on astronomical observations, and unlike a magnetic meridian, it does not require magnetic instruments. Its limitation is that the resulting bearings are relative, so they cannot by themselves establish a universal geographic orientation.
Clockwise horizontal-angle measurement provides the link between the reference line and each surveyed direction. The surveyor observes the angle from the selected line, then uses the assigned reference bearing to determine the bearing of the target line or feature. This relationship supports directional computations for traverses, property boundaries, and site elements within the same local framework.
Using an Assumed Meridian begins with selecting a suitable reference line and assigning it a bearing, commonly 0° or another convenient value. The surveyor then measures horizontal angles clockwise from that line to relevant directions. Those observations are used to determine bearings for the traverse, boundaries, or site features included in the survey.
In construction layout, the method supplies a consistent directional framework for positioning site features without requiring a true or magnetic orientation. It also suits local engineering surveys, where the immediate relationships among lines matter more than their global direction. Preliminary route planning can similarly use relative bearings to organize alternatives before a connection to a broader reference system becomes necessary.
Relative bearings remain useful beyond the initial local survey because the assumed framework can later be related to a true or magnetic meridian when broader orientation is required. This preserves the value of the original measurements while allowing the work to connect with a globally or magnetically oriented system. The selected reference and its assigned bearing must remain documented.