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170:, because the mathematics and computation involved is relatively simple, which was important given the computing power available in the late 1970s. Due to the inherent distortions caused by map projections, the buffer computed this way will not be identical to one drawn on the surface of the Earth; at a local scale, the difference is negligible, but at larger scales, the error can be significant.
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Common buffers, in which the buffers for each feature in a layer are dissolved into a single polygon. This is most commonly used when one is not concerned about which feature is near each point in space, only that a point is nearby some (anonymous)
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Side preference may be important, such as needing the buffer on only one side of a line, or on a polygon, selecting only the outer buffer or the inner buffer (sometimes called a
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The buffer operation has been a core part of GIS functionality since the original integrated GIS software packages of the late 1970s and early 1980s, such as
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Polyline, which consists of an ordered list of points (vertices) connected by straight lines. This is also used for the boundary of a polygon.
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Software implementations of the buffer operation typically use alterations of this strategy to process more efficiently and accurately.
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Endcaps at the end of linear buffers are rounded by default, but may be squared off or a butt end (truncated at the final vertex).
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Variable width, in which the features in a layer may be buffered using different radii, usually given by an attribute.
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GIS software may offer variations on the basic algorithm, which may be useful in different applications:
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Create a rectangle along each line segment by creating a duplicate line segment offset the distance
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Geospatial
Analysis: A Comprehensive Guide to Principles, Techniques, and Software Tools
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150:(or difference) of a geometry and a disk. Other terms used: Offsetting a Polygon.
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The fundamental method to create a buffer around a geographic feature stored in a
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Diagram showing the construction of a buffer (red) of a polyline feature (blue)
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containing locations that are within a specified distance of that feature, the
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in JTS, the library at the foundation of many open-source GIS implementations
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Traditional implementations assumed the buffer was being created on a planar
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333:"An algorithm for generating geometric buffers for vector feature layers"
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Bhatia, Sumeet; Vira, Viral; Choksi, Deepak; Venkatachalam, P. (2012).
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de Smith, Michael J.; Goodchild, Michael F.; Longley, Paul A. (2018).
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Merge or dissolve the rectangles and circles into a single polygon.
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Single point: Create a circle around the point with radius
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27:GIS analysis operation to evaluate distance
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146:In Mathematics, GIS Buffer operation is a
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129:Create a circle buffer around each vertex
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30:For broader coverage of this topic, see
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109:data model, with a given radius
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39:geographic information systems
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368:"How Buffer (Analysis) Works"
462:. You can help Knowledge by
350:10.1080/10095020.2012.747643
316:Wade, T. and Smmer, S. eds.
154:Planar vs. geodesic distance
136:perpendicular to each side.
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160:cartesian coordinate space
49:is the determination of a
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372:ArcGIS Pro Documentation
275:tool in Esri ArcGIS Pro
245:OGC ST_Buffer function
183:spherical trigonometry
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422:PostGIS documentation
226:Dilation (morphology)
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232:Erosion (morphology)
162:(i.e., created by a
168:Euclidean geometry
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67:proximity analysis
55:geographic feature
32:Proximity analysis
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298:"4.4.5 Buffering"
273:Buffer (Analysis)
234:(negative buffer)
228:(positive buffer)
179:geodesic distance
16:(Redirected from
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519:Spatial analysis
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18:Buffer (GIS)
418:"ST_Buffer"
59:buffer zone
503:Categories
432:2012-11-02
403:2023-11-21
319:A to Z GIS
280:References
175:ArcGIS Pro
41:(GIS) and
257:in turfjs
69:methods.
61:(or just
53:around a
514:Geometry
378:16 March
267:v.buffer
261:BufferOp
220:See also
215:feature.
166:) using
79:ARC/INFO
249:PostGIS
206:setback
193:Options
83:Odyssey
73:History
374:. Esri
107:vector
85:, and
63:buffer
460:stub
380:2021
87:MOSS
51:zone
345:doi
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