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.
Buffer - 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 ]
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Buffering features with no identity property
When you attempted to buffer a feature from a layer that has no identity property, AutoCAD® Map 3D crashed.
Main article: GIS
Objects in space have their own impact contributed to their surrounding space. Buffering is the process of creation of a zone of specified distance, called Buffer zone, around features such as point, line or polygon features.
Buffer objects by 500 meters
SELECT ST_Buffer_Meters(the_geom, 500) FROM sometable;
Buffer objects using a column of meter values ...
v.~ input=pointsmap output=circles type=point ~=1000
Note that attributes are not transferred (due to potential ~ 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 ~ strips (RBS) represent a promising approach to impeding the delivery of non-point source (NPS) pollutants into streams, thereby protecting or enhancing water quality.
~s are common vector analysis tools used to address questions of proximity in a GIS and can be used on points, lines, or polygons (Figure 7.1 "~s around Red Point, Line, and Polygon Features").
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.
More geographic concepts from the GIS dictionary: ...
A zone of a specified distance around a selected feature.
~ing creates polygons which are ~ed a specified distance from input points, lines, or polygons.
~: Area within a specified distance (radius) around a selected map feature(s).
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). This operation includes the rebuilding of topology for the new coverage with the distance zones (~s) defined as polygons.
The Create ~s dialog box appears.
Make sure that you select the same choices as in the above image. For the category "What do you want to ~?" select "The features of a theme". In the drop-down list for "The features of a theme", select "New-origin.shp.
~ 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.
~s, unions, overlays, distance and more
ACID transactional integrity
R-Tree spatial index
Table-spaces, schemas ...
~ zone query
Locate assets or customers within specified distance
Review selected features
Configuration and Administration Tools ...
~ operations can be visualized as spreading the object spatially by a given distance
the result could be a layer with values: 1 if in original selected object 2 if in ~ 0 if outside object and ~ ...
~ - (1) A zone of specified width surrounding a point, line or area feature. (2) A temporary data holding area in computer memory.
~ing - The process of generating a ~ 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.
~WithTolerance() (this is similar to PostGIS variant of ~ that takes 3 args (defaulted to 8 number of segs to use to approximate a quarter circle), MakeValid(), Reduce() - similar to PostGIS ST_Simplify(), STBoundary(), ST~(),STCentroid(), STConvexHull(), STDimension(), STEndPoint(), ...
Most ~s use constant widths to generate zones, but some ~s have variable widths that depend on feature attribute values. As an example, the figure to the right depicts a variable distance ~ based on decibels from an airport.
Create a ~ or ~s around your schools layer
Join information about school walking distance with your sites table ...
You can adjust the ~ in Windows Media Player. This will result in a longer initial download, but will help to provide a smoother presentation stream. To adjust the ~: ...
Using the ~ function in the GIS, a half-mile zone was drawn around the water company service area. [LINK] This ~ 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.
~ 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, ~ overflow in crypto.signText()
^ Paul Festa, CNet, ~-overflow bug in IE
Using readily available demographic data and applying a GIS technique known as ~ analysis, you can generate detailed profiles of the populations near your holding. For example, are you hoping to establish a park that will be accessible to communities of need?
Often "…between two points" must be expanded to "…among set of points" to account for proximity, such as ~s around streams. And "…straight line" needs to be expanded to "…not necessarily straight lines," as nothing in the real world moves in a straight line (even light bends in the atmosphere).
You can use the GIS to generate ~ zones and then identify all features that lie within a particular distance. For instance, you can select all addresses within a 500-m ~ of a busy road and compare these with data about the incidence of asthma.
~ A zone of user-specified distance around a point, line or area. The generation of ~s to establish the proximity of features is one of the most common forms of GIS analysis. For example, it may be used to find all areas of industry less than 5km from a reservoir.
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 ~ing and area selection tools. - Integrate geographic criteria into database queries (contains, intersects, within, etc.).
a) Clip, Select, Intersect, ~, & most other Analysis Tools (all the same answer)
c) ~ Wizard
d) Add Spatial Index
e) Import from SDTS
f) Feature Class to Geodatabase
g) Raster to Other Format
h) Export to Interchange File
i) Join Tables
j) Create Labels ...
A common type of proximity analysis is the ~ 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 traffic in the vicinity of a housing area.
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.
The first query set might identify ~ areas surrounding endangered habitats, another might identify all forested areas, another might show all flat areas, and another might indicate locations of competing industries.
[data conversion] A method of data conversion in which data is encoded as a sequence, stored in a file, memory ~, or other medium, and transmitted across a network connection. Data is often serialized for transmission over phone lines or networks that require data to be sent one bit at a time.
One of the most powerful geographic operations is the creation of new entities from existing ones through proximity analysis. ~ing is the creation of a polygon around some existing entity or group of entities.
To answer such questions, GIS technology uses a process called ~ing 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, and spatial or network modeling. Abbreviated SA.
This often results in the creation of new GIS datasets containing the results of analyses. Common components of GIS analysis include database query and selection, database linking, ~ing, topological overlay, clipping, dissolving, etc. This work is mainly done by GIS processing software.
Operations that require a coordinate system will return a null value when performed on these geometries. These operations include finding the area or perimeter of a geometry, creating a ~, densifying an arc, and computing the aggregate centroid.
6.10 U.S. National Grid Support ...
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, and so on; ...
See also: What is the meaning of Feature, Information, Map, GIS, Analysis?