Questions tagged [buffer]
A region enclosing a point, line, or polygon at a specified distance.
1,483
questions
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Creating square buffer around point feature using ArcMap
I would like to create a square buffer from a point feature but I do not understand the code that goes into it.
Similar questions have been asked on the forums.esri website but that was over 10 ...
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votes
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answers
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Performing reverse clip in ArcMap
Is there a way to perform a 'reverse' of the clip function in ArcMap?
I am not exactly sure how to explain this so here is a diagram:
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How to buffer raster pixels by their values?
The pixels to the left represent tree locations and their associated crown radii (i.e. pixel values ranging from 2 - 5). I would like to buffer these raster pixels by their crown radius value. The ...
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Buffer neighbouring polygons without overlap using QGIS
Is it possible to create a buffer around neighbouring polygons, so that the new polygons do not overlap?
Preferably in QGIS but any other tool will do.
So instead of the first result I would like ...
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25
votes
1
answer
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Understanding QGIS buffer tool units
I have had no luck getting the buffer tool to accept anything but degrees as units of measure.
I have found lots of stuff saying the layer needs to be reprojected and saved but it hasn't worked at ...
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votes
1
answer
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Geopandas buffer using geodataframe while maintaining the dataframe
The objective is to create a geoDataFrame with buffered geometries AND with all the "attributes" of the original geodataframe.
I am able to perform a buffer on my geoDataFrame using:
gdfHybasBuffer ...
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votes
4
answers
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Creating buffer in meters
Objective
Given a list of coordinates in longitude/latitude, stored as a .csv file, I want to create a buffer with distance of x km around those coordinates. (In case this is relevant, these ...
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votes
4
answers
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Creating one-sided buffers or parallel lines in PostGIS?
I'm looking for a way to create so-called one-sided buffers or parallel lines in PostGIS. Example: 1. buffer, 2. one-side, 3. both-sides
I've found some discussion on the mailing list from 2009 and ...
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Buffering in PyQGIS
I'm looking for some examples to do simple python scripts in QGIS. How would I do a buffer analysis on a dataset?
I can't seem to find much in the manual and QGIS python that quite matches the ESRI ...
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votes
5
answers
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Seeking Python library (other than ArcPy) for geoprocessing such as buffer? [closed]
Excluding ArcPy, is there any python library which can do geoprocessing, such as buffer/intersect, with shapefiles?
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What does buffer mean in QGIS Voronoi dialog?
Could you explain what "buffer" does in the Voronoi dialog i.e. what does the number stand for?
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Creating "Inner Buffer" using ArcGIS for Desktop?
I am currently searching for how to create an "Inner Buffer" in ArcGIS for Desktop?
I have a lot of polygons (houses) in one feature class, and one big polygon (in another feature class).
I want so ...
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2
answers
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Buffering in meters/km using WGS84 layers using QGIS
I am using QGIS 1.7.4-Wroclaw and working with an SHP layer in WGS84. I want to buffer out to a certain number of kilometers from this layer using the ftools buffer tool.
I understand that the buffer ...
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15
votes
2
answers
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views
Creating equally split buffers between points in QGIS
I want to create buffers for every health facility, but they end up overlapping.
How can I create buffers that split equally between the distance of 2 health facilities?
Example of the result wanted ...
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votes
3
answers
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Achieving Flat-End line buffers in QGIS?
I need to buffer a series of lines by 40m, however I only want the buffer to come off the sides and not off either end of the line.
I know in ArcGIS there is a "flat-ends" tickbox that achieves ...
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14
votes
2
answers
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How to buffer a line with different distances for left/right sides
How can I buffer a line in QGIS using one attribute for the left side of the line and one attribute for the right side of the line? I am trying to buffer a river with its bank width, which is ...
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13
votes
3
answers
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Aligning multiple points to line in QGIS?
I would like to align multiple points to a line, or lines within a layer, using a specified tolerance or buffer around the line objects. Please refer to the sample sketch attached.
For the sake of ...
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5
answers
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Simulating the expansion of polygon features
I've got what I'm hoping will be an interesting question. I'm working on an assignment for an intro to GIS course that uses some Gulf oil spill data to introduce common vector-based spatial analysis ...
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13
votes
2
answers
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ArcGIS Buffer accuracy problem?
Once again I encounter something very strange with ArcGIS. I perform a buffer analysis on one side of a polyline. There seems to be a serious accuracy problem and I can't figure out what the cause is. ...
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votes
1
answer
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QGIS buffer polygon with different widths on each side
I create maps for wildfire risk assessments and am constantly asked to plot "defendable space" buffer zones around building envelopes that are different distances on different sides of the buildings. (...
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How can you tell if ArcCatalog Geoprocessing is still running?
Is there some other way other than the logs to check that ongoing geoprocessing is working correctly?
I am running the Buffer tool with dissolve type ALL on ArcCatalog 10.1. I was expecting the the ...
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11
votes
4
answers
3k
views
Buffering only sides of polygons in QGIS
My goal is to create a buffer from a polygon. But the edges are the problem. That's the way I want it to look. So the goal is, that the edges are not connected. The example on the screenshot is done ...
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1
answer
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Creating square buffers around points using shapely? [duplicate]
I am trying to create square buffers around given points, I am able to create circular buffers but how do I create square ones?
from shapely.ops import transform
from shapely.geometry import Point
...
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votes
2
answers
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Create area buffers that are limited by a coastline
I'm trying to use ArcGIS 10.2 to create a buffer of points based on a pre-defined area (e.g 400 sq km). Further to that, the buffers of some of the points are close to the coastline that requires the ...
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11
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2
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Creating buffers to closest distances with two categories in QGIS
I would like to develop an expression that does the following nearest-neighbour analysis:
From a layer of points 'point_layer', I would like to calculate for each point the distance to the nearest ...
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votes
1
answer
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views
Looking to do a one-side buffer with QGIS v2.18.9
I'm working on a project that requires a 30m buffer around a linear feature. The feature represents the coast and I need the buffer to show 30m inland from the line representing the coast. Is there a ...
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votes
3
answers
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Create dissolved buffer from multi-geometry (Union by shared attribute and spatial intersection)
I've to create dissolved buffers from multi-point input features. In the example below, the input table contains 4 features. Feature #2 consists of two point geometries. After creating a buffer, I get ...
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votes
1
answer
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Splitting overlap between polygons and assign to nearest polygon using PostGIS?
My question is quite related to the unanswered Split overlap between polygons into disjoint sets except I'm not using shapely, I'm using PostGIS 2.4 on PostgreSQL 10.
I have a table containing ...
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votes
2
answers
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views
Creating buffer based on polyline without line end caps and without dissolving the created polygons in QGIS?
I have a projected line layer (Shapefile) in QGIS. For every line segment I want to create a polygon without line end caps. The resulting polygone should not be dissolved to a single one.
I tried ...
11
votes
1
answer
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Euclidean and Geodesic Buffering in R
In Understanding Geodesic Buffering, The Esri Geoprocessing Development Team distinguish between Euclidean and Geodesic Buffering. They conclude with "Euclidean buffering performed on projected ...
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How to buffer a vector shapefile using ogr python?
I am trying to learn how to use ogr in python using the country and populated places datasets from http://www.naturalearthdata.com/downloads/50m-cultural-vectors/. I am attempting to use filters and ...
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10
votes
2
answers
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Map Range of Airplanes
I'd like to create a (web)map, that is showing the range of an Airplane around some airports.
I tried to calculate a buffer with the range of the airplane.
Here you can see the result here.
But now ...
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2
answers
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Representing uneven tree canopy spread around point in QGIS
I am trying to make an attribute to show the uneven spread of the crown of a tree using the four cardinal points. I can use a buffer to show one feature, in this case a root protection area. But I ...
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votes
2
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Defining hexagon area around mapped points using QGIS
I am using QGIS to map a number of radio antennas (for mobile network).
Once I have the layer of the sites (done), I would like to assign to each site a coverage area (envelope). I could achieve that ...
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10
votes
1
answer
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views
Creating wedge buffers from many point to one in QGIS
I have two point layers. One point layer has many random points which are start points. The second point layer has only one point which is the endpoint.
I want to create wedge buffers from the start ...
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10
votes
3
answers
3k
views
Growing a PostGIS geometry by a percentage
I'm looking for a way to add a buffer around a PostGIS geometry, but the size of the buffer should depend on size of the geometry. That is, I want each geometry to be enlargened by, say, 5%.
The idea ...
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2
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projection change to create buffer in QGIS
I am about to become desperate... I like to create buffer around several points - if possible - with a declaration of the size in km of these buffers. Just to show you what I am working with:
My ...
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10
votes
1
answer
463
views
Proximity in space and time
I have some point data which represent daily lat-lon locations of an animal, with an associated timestamp.
I would like to identify all points where STATIONARY = TRUE. A point qualifies as being ...
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votes
1
answer
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Method for generating wedge buffer in PyQGIS
Is there any method generating a wedge buffer, as in Creating wedge buffers from many to one in QGIS, using QGIS Python API?
I made a search in QGIS API Documentation and GIS SE.
I'm not looking for a ...
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views
Minimum wall-thickness of a non convex polygon with holes
What is the most efficient way to find the minimal wall-thickness (value and location) of a complex, non convex polygon area including holes? See example of a polygon in blue, with the minimum wall-...
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Georeferencing Museum specimens with poor locality descriptions
I am currently collating a list of specimens from databases of various natural history museums for further research. However, a well known issue associated with majority of historical data is the lack ...
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How to create dissolved buffers using QGIS virtual layers?
To create dissolved buffers (single geometries) in PostGIS I use ST_Dump and ST_Union:
SELECT
row_number() over() AS gid,
sbqry.*
FROM (
SELECT
(ST_Dump(ST_Union(ST_Buffer(...
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votes
4
answers
9k
views
Create square buffers around points in QGIS with Python?
I have x, y coordinates in lat/long and I need to create 5x5 degree square cells around them, with the lat/long coordinates being the centroids.
My first option is to create a buffer around the ...
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votes
2
answers
3k
views
How to create an oriented buffer using arcpy?
I would like to create an oriented buffer for every polygon in my shapefile using arcpy. By oriented I mean that I have two angles a1 and a2 that constraint the direction of the buffer. This is ...
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votes
1
answer
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views
Iterating features and buffering using GeoPandas?
I have a shapefile with many large polygons and would like to process each polygon individually because spatial operations on the entire dataset are too big for memory. For instance, iterate shapefile,...
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9
votes
3
answers
3k
views
Creating buffer only in specific direction using ArcGIS for Desktop? [closed]
I am trying to create a buffer for several polygons in a south-western orientation. As far as I know, this is not possible using the buffer tool (I use ArcGIS 10.3). I could do it manually but for ...
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9
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1
answer
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views
How to create variable buffers with nearest mean distance radius value
Given a point geometries collection, I would like to use an expression which:
Find the 4 points nearest to each other
Create the buffer for each group of 4 points with the radius distance value ...
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votes
5
answers
740
views
Using buffer distance as portion of polygon variable width in QGIS
Is it possible to create a buffer of for example 3/4 of the polygons local width?
I have a polygon of river body, somewhere the river has 20 meters in width, somewhere 70 m. I need to extract the ...
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votes
5
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Buffers of public transportation transit times
I'd like to be able to create buffers/zones/rings of transit times using Denver's public transportation system. For an example of what I'm talking about, check out triptropnyc.com - I don't need it ...
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Use buffer tool to draw different radii using ArcMap
I am new to ArcMap (ArcEditor) 10. I have been mapping ethanol plants (which utilize corn to produce ethanol) and corn production amounts in the counties of the USA.
My goal is to draw buffer zones (...
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