Questions tagged [buffer]

A region enclosing a point, line, or polygon at a specified distance.

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31
votes
6answers
34k views

Creating square buffer around point feature using ArcGIS for Desktop?

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 ...
28
votes
6answers
3k views

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 ...
26
votes
10answers
56k views

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:
24
votes
1answer
25k views

Understanding QGIS buffer tool units?

I have been trying to figure this out for a couple weeks now and 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 ...
19
votes
4answers
6k views

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 ...
17
votes
4answers
10k views

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 ...
17
votes
2answers
890 views

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 ...
16
votes
5answers
4k views

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?
14
votes
3answers
3k views

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?
14
votes
2answers
16k views

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 ...
14
votes
3answers
45k views

Create buffer in meters?

I'm very new to the GIS world, so my problem could be very stupid, but I'm going to try anyway. Objective Given a list of coordinates in longitude/latitude, stored as a .csv file, I want to create a ...
14
votes
2answers
3k views

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 ...
14
votes
2answers
3k views

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 ...
13
votes
5answers
1k views

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 ...
13
votes
2answers
1k views

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. ...
12
votes
2answers
7k views

What's the Workflow for buffering in meters/km using WGS84 layers?

I'm a little bit new to GIS, so bear with me a minute.... I'm 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 ...
12
votes
3answers
10k views

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 ...
11
votes
1answer
2k 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 ...
11
votes
1answer
769 views

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. (...
10
votes
4answers
896 views

Buffering only sides of polygons in QGIS?

My goal is to create a buffer from a polygon. But the edges are the problem. I can't really explain it in words, so I will post a screenshot. That's the way I want it to look. So the goal is, that the ...
10
votes
2answers
1k views

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 ...
10
votes
3answers
3k views

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 ...
10
votes
2answers
624 views

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 ...
10
votes
1answer
399 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 ...
10
votes
2answers
4k views

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 ...
10
votes
3answers
2k 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 ...
10
votes
3answers
2k views

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 ...
10
votes
2answers
1k 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 ...
10
votes
1answer
327 views

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 ...
10
votes
2answers
5k views

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 ...
9
votes
2answers
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 ...
9
votes
3answers
1k views

Creating buffer only in specific direction using ArcGIS for Desktop?

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 ...
9
votes
5answers
2k views

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 ...
8
votes
2answers
4k views

How to 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 ...
8
votes
3answers
6k views

When should I use ST_Buffer?

I would like to know what is the sense of using st_buffer operation. In PostGIS reference guide there is only the syntax and a short description of this operation. Could you give some examples to ...
8
votes
6answers
7k views

Creating multiple buffers using QGIS?

I'm new to QGIS and have no programming skills. Is there an easy/uncomplicated way to create multiple buffers around a line feature?
8
votes
3answers
289 views

Buffering polygon until it hits neighbor using PyQGIS?

I have a shapefile made up of a number of polygons. Neighboring polygons often share an attribute. What I need to do is buffer these polygons based on the common attribute. However, I would like to ...
8
votes
2answers
346 views

Enlarging polygons only on two sides using ArcGIS Desktop?

I want to enlarge a line of polygons only on the sides but I only found tools like "scale" or "buffer" which extend the whole polygon and not only widen them. The problem with scaling or buffering is ...
8
votes
3answers
2k views

Use buffer tool to draw different radii?

I am new to Arcmap-Arceditor 10 and could really use your help. I have been mapping ethanol plants (which utilize corn to produce ethanol) and corn production amounts in the counties of the USA. My ...
8
votes
1answer
944 views

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 ...
8
votes
4answers
500 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-...
7
votes
4answers
3k views

Improving upon ArcGIS Buffer/Dissolve performance?

I'm wondering if anyone else has experienced significant performance penalties when using the ArcGIS buffer function with the 'dissolve' option on point features. My dataset is a shapefile of 260 ...
7
votes
2answers
980 views

getPart() method returns incorrect geometry from buffer in ArcGIS

I created 4 most basic polygons: And ran this script: import arcpy infc = r'D:\Scratch\POLYGONS.shp' d=arcpy.Describe(infc) SR=d.spatialReference with arcpy.da.SearchCursor(infc, ("SHAPE@","LABEL")) ...
7
votes
1answer
434 views

Single sided buffers gives not only buffer on one side

I have tried to use single sided buffers to make buffer on one side of of a line. But the buffer is sometimes changing sides as shown below: Must mention that the line is straight: What is the ...
7
votes
1answer
4k views

Calculating size of particular area below buffer in QGIS?

I have a point shapefile of villages where data was collected in Northern Kenya. I created a buffer around those villages. The second vector layer contains polygons defining areas according to ...
7
votes
2answers
652 views

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 ...
7
votes
1answer
1k views

QGIS define hexagon area around mapped points

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 ...
7
votes
2answers
348 views

Perfect circle in ArcGIS, why I get a multiside polygone (plurigone)?

Using ArcGIS basic (10.3), I tried to make perfect circles in ArcGIS with the buffer tool. As you can see on the two print screens, the circle is not perfect when I use a radius of 7,5 meters in a MTM ...
7
votes
2answers
544 views

How to automatically sum up values within buffers?

I want to establish the population figures within multi-ring buffers around certain site. I have set up the buffers and am running a select by location query on each concentric ring. Once the ...
7
votes
1answer
16k views

How to create a polygon (fixed width buffer) around a polygon in QGIS? [duplicate]

I have created a polygon in QGIS (in this case it describes a country's maritime baseline). I need to create a second polygon whose boundary is a fixed distance from the original polygon. (in this ...