A zone of a specified distance around coverage features. Both constant-and variable-width buffers can be generated for a set of coverage features based on each feature`s attribute values.
- A temporary-storage device used to compensate for a difference in data rate and data flow between two devices (typically a computer and a printer); also called a spooler. [Category=Database Marketing ] ...
Main article: GIS
Objects in space have their own impact contributed to their surrounding space.
objects by 500 meters
SELECT ST__Meters(the_geom, 500) FROM sometable;
objects using a column of meter values ...
v.buffer input=pointsmap output=circles type=point buffer=1000
Note that attributes are not transferred (due to potential buffer overlap which cannot be resolved automatically).
Non-overlapping circles around input points with attribute transfer ...
The distance is given in map units by default. You can also give the value in other units by specifying a distance units abbreviation with the value that you enter.
Vegetated riparian buffer strips (RBS) represent a promising approach to impeding the delivery of non-point source (NPS) pollutants into streams, thereby protecting or enhancing water quality.
A zone of a specified distance around features in a geographic layer. s can be set at constant or variable distance based on feature attributes. The resulting zones form polygonal coverages.
Buffering: The process of creating areas of calculated distance from a feature
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A zone of a specified distance around a selected feature.
Buffering creates polygons which are buffered a specified distance from input points, lines, or polygons.
: Area within a specified distance (radius) around a selected map feature(s).
It is possible to analyse how close objects are to one another using a buffer. A buffer is a shape based on any other existing object (point, line or area) that can be generated by the GIS.
1. An area of temporary data storage.
2. Compilation of distance zones from a selected coverage feature (which may be a point, line, or polygon).
The Create Buffers dialog box appears.
Make sure that you select the same choices as in the above image. For the category "What do you want to buffer?" select "The features of a theme".
A polygon enclosing a point, line, or polygon at a specified distance. Use the or Select by AOI tools for this function.
Coordinates X and Y values which define a location in a coordinate system.
Buffer zone query
Locate assets or customers within specified distance
Review selected features
Configuration and Administration Tools ...
s around objects and features are very useful GIS capabilities
e.g. build a logging 500 m wide around all lakes and watercourses
operations can be visualized as spreading the object spatially by a given distance ...
Buffering - The process of generating a buffer zone from a point, line or area feature by offsetting a user-defined distance from these features.
In GIS, a polygon generated around an existing geographic object that is often used for proximity analysis.
Create a buffer or buffers around your schools layer
Join information about school walking distance with your sites table ...
Figure 7.9 operations
The following figure 7.10 shows walking distance from ICIMOD building.
Figure 7.10 Walking distances from ICIMOD ...
Using the buffer function in the GIS, a half-mile zone was drawn around the water company service area. [LINK] This buffer zone was the "window" used to view and combine the various map coverages relevant to the well site selection.
Dissolve Barriers - An option in the wizard to treat a soon to be created as either one object or several
Feature - A digital representation of something in the real world.
buffer p. 142 a zone constructed outwards from an isolated object to a specific distance. C
CAD p. 31 computer-aided design, software packages designed to automate drafting of mechanical drawings. cadastral p.
It includes such GIS functions as topological overlay, generation, and spatial or network modeling. Abbreviated SA.
^ Mozilla Corporation, Buffer overflow in crypto.signText()
^ Paul Festa, CNet, Buffer-overflow bug in IE
Often "…between two points" must be expanded to "…among set of points" to account for proximity, such as s around streams.
Buffer A zone of user-specified distance around a point, line or area. The generation of buffers to establish the proximity of features is one of the most common forms of GIS analysis.
Get the coordinates for the quad box and add a 100-meter
Use the coordinates with the generate command to generate a polygon coverage
Calculate which quads will be needed ...
- Perform detailed geographic searches with buffering and area selection tools. - Integrate geographic criteria into database queries (contains, intersects, within, etc.).
Point features may be sufficient for small communities, in which case a circular is generated to create an area for the feature.
A common type of proximity analysis is the buffer zone. Coverage can be quit complicated involving many layers and mathmaticaly complex such as the decreasing sound levels due to the inverse proportion law of noise generated by various types of air ...
The solid contours are graduated s around the on-ramps at intervals of 1,467 feet in this picture. (Your intervals will be different unless you chanced to use exactly the same analysis extent.
[data conversion] A method of data conversion in which data is encoded as a sequence, stored in a file, memory buffer, or other medium, and transmitted across a network connection.
ing is the creation of a polygon around some existing entity or group of entities. The creation of a polygon that represents the area within ten kilometers of a hazardous materials transportation route is an example.
To answer such questions, GIS technology uses a process called buffering to determine the proximity relationship between features.
Overlay Analysis: ...
In GIS, there are four traditional types of spatial analysis: spatial overlay and contiguity analysis, surface analysis, linear analysis, and raster analysis. It includes such GIS functions as topological overlay, generation, ...
Common components of GIS analysis include database query and selection, database linking, buffering, topological overlay, clipping, dissolving, etc. This work is mainly done by GIS processing software.
There are three categories of spatial modeling functions that can be applied to geographic features within a GIS: (1) geometric models, such as calculating the Euclidean distance between features, generating s, calculating areas and perimeters, ...
See also: Feature, Information, Map, GIS, Analysis