Topographical Artifacts
Topographical Artifacts - Related Videos
07:13
Using Topographic Maps to Generate Topographic Profiles
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2023
Source: Laboratory of Alan Lester - University of Colorado Boulder Topographic maps are "plan-view" representations of Earth's three-dimensional surface. They are a standard type of map-view that provides an overhead, or aerial, perspective. Among the defining features of a topographic map are the contour lines that indicate locations of constant elevation. The elevation interval between the contour lines is dependent on the level of detail provided by the map and the kind of topography present.
01:29
Topographic Surveying and Contours
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2025
Topographic surveying is critical for documenting the Earth's surface, focusing on capturing elevations, slopes, and natural and man-made features. It is essential in construction planning, water resource management, and land-use analysis. The primary outcome of such surveys is a topographic map, which uses contour lines to visually represent the shape and slope of the terrain, providing valuable insights into the landscape's characteristics.Contour lines are fundamental to understanding the...
01:29
Plotting of Topographic Maps
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2025
Topographic maps represent the Earth's surface features using contour lines, which connect points of equal elevation to create a two-dimensional representation of three-dimensional terrain. Creating a topographic map requires a systematic approach.Begin by plotting a scaled grid and marking intersections corresponding to the survey's elevation data points. Assign elevation values at these intersections to build the base map. Next, determine contour levels using a consistent contour interval,...
06:42
A Multi-hole Cryovial Eliminates Freezing Artifacts when Muscle Tissues are Directly Immersed in Liquid Nitrogen
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Cited by 9 •
2017
This protocol describes a procedure to freeze muscle tissues by plunging them directly into liquid nitrogen. This protocol also highlights a new cryovial that can avoid the "blanket effect" of nitrogen gas when liquid nitrogen contacts the tissue surface of a specimen.
06:02
Topographical Estimation of Visual Population Receptive Fields by fMRI
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Cited by 3 •
2015
It is important to obtain unbiased estimates of visual population receptive fields (pRFs) by functional magnetic resonance imaging. We use mild regularization constraints to estimate pRF topography without a-priori assumptions about pRF shape, allowing us to choose specific pRF models post-hoc. This is particularly advantageous in subjects with visual-pathway lesions.
FAQs
Probe geometry can alter the recorded shape when the sensing element cannot follow the surface profile exactly. Narrow features, steep transitions, or closely spaced features may therefore appear broadened, distorted, or otherwise different from the material itself. Comparing the measured pattern with the probe configuration helps engineers judge whether an apparent feature reflects component geometry or measurement interaction.
Instrument resolution limits how finely surface height variations can be captured and reconstructed. Features smaller than, or poorly represented by, that resolution may be suppressed, merged, or represented by misleading patterns. Consequently, engineers should interpret apparent roughness or texture in relation to the instrument’s resolving capability rather than treating every visible variation in a map as a material feature.
Vibration can introduce unwanted patterns into recorded height data, while lighting may change the apparent surface structure in imaging-based measurements. Sample preparation can also modify how the surface is presented to the system. Considering these conditions during interpretation helps separate environmental or preparation-related effects from genuine roughness, defects, or texture in the examined material.
Scanning parameters determine how the system samples and reconstructs surface information, so unsuitable settings can produce misleading patterns or obscure meaningful detail. Filtering can introduce a similar risk by changing the representation of measured height data. Engineers should examine whether a feature persists under appropriate processing choices before assigning it to the surface or using it for dimensional conclusions.
Engineers compare the apparent feature with the measurement conditions, including probe geometry, resolution, vibration, lighting, sample preparation, scanning parameters, and filtering. A pattern that corresponds closely to one of these system influences may be measurement-induced rather than a physical defect. This distinction supports more reliable interpretation of profilometry, microscopy, and three-dimensional surface maps.
Begin by identifying the measurement or imaging conditions that could affect recorded height, then review probe characteristics, resolution, environmental stability, sample preparation, scanning settings, and filtering. Next, assess whether the suspected feature is consistent with those influences or with the material’s expected roughness and texture. This workflow reduces the chance of accepting a processing or acquisition pattern as physical evidence.
Unrecognized artifacts can lead to incorrect conclusions about dimensions, surface quality, defects, texture, or component reliability. In manufacturing quality control, that may affect judgments about whether a part meets requirements. In materials characterization, it can distort interpretation of surface behavior. Detecting these effects improves confidence in measurements and supports better decisions about component performance and surface reliability.