contrast stretch
[graphics (computing)] Increasing the contrast in an image by expanding its grayscale range to the range of the display device.
Contrast
The relationship of the brightest to the darkest portions of a display image.
Control ...
Contrast Stretching and Density Slicing
We move now to two of the most common image processing routines for improving scene quality. These routines fall into the descriptive category of Image Enhancement or Transformation.
Contrast with: great circle, small circle.
On a Mercator projection map, a loxodrome is a straight line; beyond the right edge of the map it continues on the left with the same slope.
Contrast this to the ArcInfo data structure, in which a single feature layer source consists of data files spread across more than one directory, and it is impossible to manage the coverage with just the operating system.
contrast
In remote sensing and photogrammetry, the ratio between the energy emitted or reflected by an object and that emitted or reflected by its immediate surroundings.
In contrast to the GPS specification IS-GPS-705, the L5 signal transmitted by SVN49 contains only a data-less Q5 component modulated with the pseudorandom noise ranging code PRN63 and therefore acts mainly as a placeholder to preserve the L5 ...
In contrast, SiteView uses an object-oriented data model to store information. The set of objects, such as well points or soil polygons is pre-defined, cannot easily be modified by the user, and is designed specifically for site characterization data.
In contrast to Kant's views (and despite wide acceptance that human perception of phenomena is not necessarily an accurate reflection of the universe as it really is), ...
In contrast, other cylindrical projections like the equidistant cylindrical, Miller and Mercator have conventional graticules defined arbitrarily, not by a light source analogy.
Lambert's Cylindrical Equal-Area Projection ...
By contrast, ArcGIS Mobile is used to build and deploy custom mobile applications and is installed as a part of ArcGIS Server. ArcGIS Mobile is designed to support specific field workflows.
By contrast, a single planar co-ordinate system based upon the transverse Mercator projection is used for all recent mapping for Great Britain, which is elongated north-south but narrow east-west.
In contrast to the Atlantic, a below-normal hurricane season is expected in the Eastern and Central Pacific.
In contrast, the "raster" or "grid-based" format generalizes map features as cells or pixels in a grid matrix (figure 3.3). The space is defined by a matrix of points or cells, organized into rows and columns.
In contrast to the Perceptory the MADS is able to model explicitly also topological relations. By default the relations are not stamped but are accessible by the representations having their stamps in both objects connected by the relation.
F4: Start contrast adjustment dialog box for grayscale image.
F5: Full view, or fit the entire image in the window.
Control key + Left Mouse Button: Get distance measurement shown in the status bar at the bottom.
This data in contrast to interval data deals with an absolute zero. Such as the Kelvin temperature scale and grades.
Continuity ...
(2). Compare and contrast the function and structure of the grazing and detritus food chain.
(3). What is an ecosystem? How does it differ from a community? What are some of its important components?
Digital Map A machine-readable representation of a geographic phenomenon stored for display or analysis by a digital computer; contrast with analog map. Digital Number (DN) In image processing, the value of each pixel in a dataset.
(See neap tide for contrast.)
Flowing Well:
A well that taps an aquifer that is under enough pressure to force water to the surface. Caused when the aquifer has a recharge area at a higher elevation.
Fluid Inclusion: ...
This can be fixed by adjusting the stretch of the contrast enhancement to scale the shades of black and white to the values found within the data. To adjust the contrast enhancement, right click the DEM and select properties.
The gamma setting will primarily affect the degree of contrast between mid-level grey values of an image. If gamma is left uncorrected the design of colour images and how they look to the Web audience will be totally unpredictable.
The instrument measures the contrast between the image and non-image portions of the microfilm. Microfilm has similar properties to other film.
It is easily fooled by low-contrast areas like snow fields and it cannot see through clouds. All of the null-data areas in this file (ASTER_DEM20020108123405.hdf) have elevation values of -150m.
Lorenz] A graphical method of contrasting two comparable distributions. In regional economic analysis, the Lorenz curve is used e.g.
Today's rosy picture sharply contrasts with the si tuation in 1969 when GIS first began at ORNL. At that time only a few centers--principally Environment Canada, the U.S.
Contrast to forms interface. commit To make permanent any changes made during a database transaction. Compare with roll back.
More advanced data processing can occur with image processing, a technique developed in the late 1960s by NASA and the private sector to provide contrast enhancement, ...
These procedures include contrast and color manipulations and spatial-filtering methods (Schowengerdt 1983).
Contrast: This measure considers the amount of local variation and is the opposite of Homogeneity (when high pixel values concentrate along the diagonal).
Correlation: This measure analyses the linear dependency of grey levels of neighboring pixels.
Which provides more contrast among symbols: varying size or color? What advantages and disadvantages does each approach have for map making?
Experiment with patterns (textures) in the polygonal features.
This is in contrast to most conventional vector data models that maintain data as multiple attribute maps, e.g. forest inventory polygons linked to a database table containing all attributes as columns.
Analog Map Any direct viewable map on which graphic symbols portray features and values: contrast with digital map.
Annotation Text on a drawing map associated with identifying or explaining graphic entities shown.
Arc See line.
A coordinate based geographic data structure (in contrast to raster)often used to represent linear features.
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Find your watershed ...
Vector methods are sometimes contrasted with raster techniques which record geographic features within a matrix of grid cells.
This is in contrast with spatially referenced data which are thematic or applied data (such as addresses coded by distribution routes planned by street address).
Analog Signal
The principal feature of analog signals is that they are continuous. In contrast, digital signals consist of values measured at discrete intervals.
Record: In an attribute table this would consist of a single "row" of descriptors for one feature in contrast to an item or field or column which consists of a single attribute descriptor.
A time measure of how far apart places are (how long does it take to travel from place A to place B?). This may be contrasted with other distance metrics such as geographic distance (how far is it?) and cost-distance (how much will it cost to get ...
This is in contrast to the vector approach of relative GPS, which is achieved by observing C/A-code-phase (pseudorange) error measurements at one or more known stations and then transmitting the data to the remote station(s).
Exposure Assessment: The determination of the proximity or actual degree of contact of a defined population with a putative (supposed) health hazard. Exposure is sometimes contrasted with dose, ...
In contrast, the areas near or within existing development indicated on the land use map were identified as suitable for development.
For instance, consider the billiard table orbifold, which is just a rectangle. In the orbifold Euler characteristic, the four corners each count , the four edges count , and the face counts 1, for a total of 0. In contrast, ...
The process of displaying a vector map for a particular area involves the querying of the database to select the objects that fall within the geographic area in question and displaying them appropriately on a map. In contrast to raster maps, ...
Contrasted with halftone (screened) and line copy. contour Imaginary line on ground, all points of which are at the same elevation above or below a specific datum. contour interval Difference in elevation between two adjacent contours.
 See also: Information, Area, Feature, Image, Model
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