Questions tagged [buffer]

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

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votes
1answer
64 views

Buffering around feature except where barrier prevents using QGIS

Is is possible to grow a buffer around a feature, except where another feature stops the expansion using QGIS? There is an existing similar question for ArcGIS Desktop: Buffering with physical ...
2
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1answer
69 views

Calculate area with a buffer

I am looking for help for my master thesis. I have two layers, a set of households and burned area (vector data). I created buffer zones around each household and now want to estimate the burned area ...
2
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1answer
44 views

Turf.js buffer distance not accurate

I'm facing a strange behavior using buffers in Turf.js. When trying to do a 50m buffer around a point, the result is actually closer to 35m. On the screenshot below, the smaller circle is a turf....
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0answers
40 views

Unexpected result from Oracle SDO_AGGR_UNION

I'm getting a result that looks incorrect from the Oracle Spatial SDO_AGGR_UNION function. I'm hoping someone has seen this and can confirm it's a bug or explain why this is expected behavior. ...
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0answers
24 views

Buffering in QGIS3 is returning giant circles [duplicate]

I'm trying to buffer some lines in QGIS. However, the result I'm returning are giant circles. I've tried several different CRS and made sure the project and layer had the same CRS but the result is ...
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0answers
33 views

Creating a buffer around line segments in QGIS [duplicate]

I am trying to create buffers around a shapefile of rivers, the shapefile consists of line segments. I am trying to create a 5,25, 75, 100-meter buffer around the lines using the multi-distance buffer....
1
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1answer
35 views

Select points within a buffer around a line

Working with PostgreSQL. I have a Table with streets (Linestrings), and a Table with accidents (Points). The streets are divided into sections. I want to find the accidents within 50m around a certain ...
1
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1answer
75 views

QGIS 3.10 buffer around polygon in kilometer units

I am trying to make the buffer in kilometers around my polygon. When I run the "Buffer" option, then I am getting the degrees: There is quite a few solutions, even similar to mine: Create buffer in ...
2
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1answer
37 views

GeoServer WPS request “Failed to retrieve value for input geom”

I am trying to do a buffer with WPS request builder of GeoServer. I copied the URL of the gml3 output in GeoServer: and I pasted it as the input URL I ran the process and I received the following ...
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1answer
38 views

QGIS Polygon buffer on only one side

I want to create a buffer on only one side of a polygon. When I create a buffer in the symbology tab in the layer properties, I get the following result: I need a buffer that starts at the outline of ...
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0answers
76 views

Creating a dissolved buffer layer in PostgreSQL/PostGIS

I have got a MultiPolygons layer to which I want to create 10 meter buffer around and then dissolve. All data are having SRID 4326. I am new to PostgreSQL/PostGIS. I am drifting around the ST_Buffer ...
2
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2answers
70 views

Get median distance from a bunch of points from a assigned location and draw buffer accordingly

I have 2 point layers, say layer A and Layer B Layer A with a bunch of points, Layer B with a single point. I first need to measure all the distances between every single point in layer A and the ...
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1answer
50 views

Strange buffer of polygons in sf st_buffer()

I am trying out the R package sf function st_buffer(): outbuf <- st_buffer(inpoly,10) and get a buffer which looks strange. The buffer seems to be gridded in some way and does not cover the ...
2
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1answer
38 views

Remove buffer in catalog_apply()?

I am using catalog_apply() to normalize las points using lasnormalize() and segment individual trees using lastrees(). This is modified from the catalog_apply() lidR documentation (p.10): library(...
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0answers
32 views

Remove buffer from polygon

I need to remove the outside area of a polygon based on a numerical value in a python script. It would be to determine a core habitat for a species that don't live at the edge of their habitat. I'm ...
3
votes
1answer
41 views

Buffer (for 8 points) is set at 1 kilometer but is bigger than village polygons

Other details This is in the Philippines and I'm using WGS_1984_UTM_Zone_51N The buffer is 1km long so it must be the map layer that is wrong I tried the Geodesic method instead of Planar but still ...
3
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1answer
42 views

Export looped layers at once using PyQGIS?

I am trying to use one-side buffer on road centerline (layer name: small_road) by 1~40m. I've succeeded in creating one buffer (2m) file at a time using 'SEGMENTS':2,'JOIN_STYLE':0,'MITER_LIMIT':2,'...
2
votes
1answer
96 views

Issues with units for Geometry by Expression in QGIS 3.10 - Super-sized buffers! [closed]

I am having issues performing a geometry by expression operation on a layer I have imported into QGIS. The issue is that the wedge buffers created by the expression I am using are far larger than they ...
0
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1answer
20 views

Spatial Analysis: use of buffer function inside GeoDjango's LineString model

I'm trying to make a buffer around a line. I've a model with a LineString field and I would to use the buffer function like this to make my buffer. The aim of this is render the buffer on a webmap ...
0
votes
1answer
36 views

Multi Ring Buffer “Outside polygons only” option grayed out - ArcGIS

I'm trying to create a multi-ring buffer around a shapefile of ~400 points in ArcMap 10.6.1 using the Multiple Ring Buffer tool. I need the buffers to be "doughnut style" not "swiss cheese" style, ...
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0answers
24 views

Creating a buffer around point features in GeoServer and serving it as WFS

I am using an old version of MySQL that does not support buffer process. I want to publish the data in the internet using GeoServer. In addition, I need to create a buffer around each point of danger ...
3
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2answers
85 views

Combining ST Buffer and Intersect with Where clause

I'm trying to create a buffer around a single point in a spatial entity and finding all the points from a different entity that fall within that buffer. I tried two approaches. The code below runs ...
2
votes
1answer
56 views

Using OpenLayers and JSTS to create buffer geometry

So far I have found similar questions like this one but none have quite expressed or fixed my exact issue. I'm using Openlayers v4.6.5 and JSTS 1.4.0 The problem I'm having is with the buffer() ...
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0answers
37 views

PostGIS buffer in meters without geography

I am building an application where I need to build a radius n meters around a given lat, lon. the st_buffer overload that uses a geography type for the first parameter would work fine, however, I am ...
8
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4answers
292 views

Varying size buffer along line with PostGIS

I want to create a buffer along a line where the buffer width corresponds to a fraction of the length of the line, something like that: To do that my idea is to compute for each node of the line (...
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0answers
47 views

Making a buffer - degrees instead of meters [duplicate]

I just started working with GIS very recently. I'm trying to create a buffer of 200m around the points of the layer "vlaamse venen naamloze laag". But in the distance box, the program will only allow ...
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0answers
26 views

Buffer in meters instead of degrees in south america

I need to create some buffer in meters, but it not possible how I'm doing. I really don't know what is happening. My code: library(rgdal) minas_ti<- readOGR("minas_TI.shp") minas_ti<-...
2
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0answers
36 views

Strange buffer shape when using planar buffer method

I'm doing a very simple operation involving clipping some streams from the National Hydrography Dataset in ArcGIS Desktop 10.3.1, reprojecting them from "GCS North American 1983" into "USA Contiguous ...
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0answers
39 views

Calculating area of land cover within 30m of streams for whole U.S.?

I'm trying to do a very simple analysis where I need to find all land cover of a certain type within 30 meters of a stream. I have a raster from the National Land Cover Database (NLCD) from which I've ...
2
votes
0answers
32 views

Variable buffer maximizing mean raster

I was wondering if it exists a way to create variable buffers where the radius is given by a process of maximization of the mean value of a raster. I have a point vector data and I would like to ...
5
votes
1answer
109 views

Creating Variable Distance Buffers using QGIS

I would like to create variable distance buffers for some points in QGIS 3.4. I have seen in previous posts that there used to be a tool for this in older versions of QGIS, but that this tool wasn't ...
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0answers
47 views

Quartiling a vector buffer in ArcMap 10.7

For reference, I found another Q&A with an answer to this same question for QGIS but I am looking for an ArcMap solution: Quartiling a vector buffer in QGIS 3.6. I am trying to figure out if ...
3
votes
1answer
48 views

Merging or joining two tables with some matching columns in QGIS to calclulate unique values

I have two tables (A and B) that display the presence or absence of a species within a polygon and within each polygons associated buffer layer. The purpose of the buffer layer is to account for a ...
1
vote
1answer
39 views

Multiple buffer ring area analysis using ArcGIS Pro

I have some sites what I've created multi ring buffers for in one shape file, each ring is 50m from the center up to 1000m. The file is one shapefile with many polygons and each ring is the full size (...
1
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0answers
52 views

Defining buffer size when labeling text in QGIS?

I need to set label buffer size to near zero but I dont want to overlap labels. How to define buffer size when labeling text? Currently I am using labeling settings which is allowing all available ...
0
votes
0answers
33 views

Metric system not working properly while creating buffer in QGIS

I am creating 10 meter buffer on line geometry shapefiles. But the output buffer is too large. CRS of my shapefile is EPSG:24383, which is in metric system. I am creating buffer using Vector > ...
0
votes
1answer
45 views

Excluding feature classes from list using ArcPy [closed]

I'm new to Python and trying to buffer some feature classes within a list in a Geodatabase. I used the Clip* wildcard to select the files, but I want to exclude three of those files, so I don't use ...
2
votes
1answer
50 views

Creating plugin in QGIS

I have a problem with my first QGIS 3 plugin. I want to calculate lenght each segment in my polyline and next creating buffer equal 1/2 length of line. The first 13 lines code have to do calculating ...
1
vote
3answers
123 views

Variable Buffer on Street Centerline using ArcGIS

I have a street centerline file where all road segments have a functional class of Arterial (A), Collector (C), Local (L). I also have a point file of each intersection. I would like to do a crash ...
1
vote
1answer
80 views

Drawing concentric circles with different radii in QGIS

I have table that contain point data and multiple distance value for the point data in three different direction. I would like draw arc of 65degree in each of these three directions where the radius ...
3
votes
2answers
104 views

Percentage buffer around multiline in QGIS?

I need to create plugin to QGIS that will draw buffers about width equal 1/2 length each line. Example (my amateur sketch in MS Paint): So, around each lines be created square I searched good ...
2
votes
0answers
36 views

Row-wise Reprojection of SPDF in R [closed]

I have multipolygons that span across the globe. I was wondering if it was possible to re-project each row, i.e. each country/ ISO3 to a local projection, using a central grouping mechanism. For ...
2
votes
2answers
26 views

Representing Roads as Corridors using ArcGIS Desktop?

I am building a map of historic roads with ArcGIS Desktop 10.7.1. Because of the poor accuracy of old maps and the fact that historic roads changed alignment often - sometimes seasonally - a better ...
1
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0answers
113 views

Correct Buffers crossing dateline in sf package in R

Using the global coral reef distribution data provided by UNEP https://data.unep-wcmc.org/datasets/1 I have been attempting to buffer around the points and polygons of coral reefs. The point buffers (...
1
vote
1answer
54 views

Extracting the Number of Pixels within Buffers around Various Points in Google Earth Engine?

I have a Feature Collection of various points, each of which I've drawn a 2.5km buffer around using the following: var bufferBy = function(size) { return function(feature) { return ...
0
votes
1answer
38 views

Zonal Statistics only producing one line of statistics

I am by no means an expert in ArcGis, but I will try and explain my problem as clearly as possible. I am analysing forest cover data from the Hansen land-cover dataset ( data https://...
2
votes
1answer
103 views

Postgis and QGIS inner buffer issue

While creating inner buffers for polygons on postgres/postgis base- a set of few thousand- I received a strange result. Inner buffer for one of the polygons, that was not supposed to appear from ...
1
vote
0answers
38 views

How to clip polygon such that only regions in 'line of sight' from a point remain

I am using ArcGIS. My point represents a monitoring station and is located within a polygon representing a river catchment. I have created a buffer of 300m representing the detection range of the ...
0
votes
0answers
30 views

Specifying distance units in ArcGIS Pro ModelBuilder buffer process

I'm trying to iterate on some buffer distances in ModelBuilder, and I want to be able to set the units in ModelBuilder. I have numeric (double or long) "multivalues", and I can connect the output of ...
0
votes
1answer
125 views

Draw a spatial grid with the lat/longs at the center of the grid using R

I looked through multiple posts on the same, and most of them end up drawing a grid connnecting the points or a grid connecting the bounding box of the coordinates. I need a grid with each of these ...