Questions tagged [buffer]

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

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1answer
15 views

Proportion of polygon classes in each multi-ring buffers

I have a landcover map with many irregular polygons, with each polygon a uniform habitat type. I have a second shapefile of points, and a third shapefile with multi-ring buffers around those points. I ...
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0answers
21 views

How to get middle line of buffered shape in R? [on hold]

Just simply, what function to use to get the middle line of such shape? This is a product of sf::st_buffer( ) function and these are 2 polygons, smaller and larger. How to get average one (in the ...
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0answers
35 views

Hacks to make Python scripts faster? [closed]

I've got a GDAL/OGR-based Python script that's drawing buffers around roads. In any particular area, it goes road by road (feature by feature) drawing a buffer around a road, and appends that road's ...
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1answer
18 views

Draw a polygon following a centreline in Google Earth

I am trying to draw a buffer of 30km distance around a path I have in google earth. I need this buffer as a polygon as I need to export it to XML for a different purpose. Is there any way to do this ...
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1answer
53 views

Creating raster cell squares around SpatialPoints (until a certain value range of the raster cells is achieved)

I have a DEM raster and a list of SpatialPointsDataFrames (data available here https://drive.google.com/open?id=1ERFdsqDGLH1a_FbxwawE_gPm0Au0Q9vT). EDIT: (with regard to @Spacedman's comment) I ...
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1answer
44 views

Saving data of original layer while buffering in QGIS?

I'm using QGIS 2.18.27. I have the following problem: I am trying to create some buffers in the city center, as you can see. And I need to calculate some statistical parameter on every buffer. As ...
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0answers
34 views

Creating buffer for polygon in R

I am quite new to GIS area. I have a polygon and use concave hull function I could get a boundary like this What I what to do is add a certain-width band along the boundary, so that it could look ...
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1answer
705 views

Converting polyline to fixed width polygon using QGIS?

I have a shapefile of polylines for trails, and I need to convert them all to be polygons that are 8 ft wide (4 ft from the center of each side of the polyline). I tried a following a few other posts ...
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0answers
20 views

Eliminating/minimizing distortion in 200 NM EEZ buffers? [duplicate]

I frequently need to calculate buffers of 200 nautical miles from country or baseline polygons in order to map maritime Exclusive Economic Zones (EEZs). However, I've noticed that when generating the ...
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0answers
20 views

QGIS 3.6 QUICKOSM buildings query CRS with metre untis to create buffer

Using QGIS 3.6.2 I'm running a QUICKOSM query to find residential buildings in Scotland. I want to then put a buffer around them. The query is fine, if a little slow. The only CRS I can get to ...
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1answer
93 views

Subdividing square buffer in sub-units using QGIS?

I've been trying for a while now to create a grid inside a square buffer, so that it can be divided into a pre-defined number of sub-units. Creating a grid that covers the whole area is not ideal ...
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1answer
589 views

Buffering around point using WFS Filter?

I'm trying to make a buffer around a geometry (point/s,linestring,etc) using WFS queries without luck. This is what I've been doing: <ogc:Filter> ... <ogc:Function name="...
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0answers
195 views

Using transform function in QGIS layer geometry generator?

I'm trying to use the following expression in the geometry generator in a QGIS layer to show a 1-mi boundary around points: buffer(transform($geometry, 'EPSG:4326', 'EPSG:2877'), 5280) However, the ...
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0answers
32 views

Calculating variable buffers using slope between river and point 100' away using ArcGIS Pro?

I have a network of streams that I need to buffer based on a basic rule set. This buffer will depend on the slope. The slope is determined by the looking at the difference in elevation between a ...
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0answers
26 views

Creating drive time buffers in QGIS [duplicate]

I have a set of points in QGIS and I am trying to create drive time buffers around them, how do you do that? I am using QGIS 3.6.3.
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1answer
68 views

Building single sided buffer around categorized polygon layer

I need to build a 100m buffer around a categorized polygon layer using QGIS 3.2. The layer has four classes and no holes. The difficulty here is, that the buffer needs to be split into the 4 ...
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0answers
31 views

PostGIS - Get geofence polygon points within 100 metres of an existing geofence

Let's say I have a geofence polygon with the following coordinates POLYGON((-36.861986 174.726745,-36.859241 174.730442,-36.859821 174.730976,-36.862321 174.728156,-36.861986 174.726745)) I'd like ...
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1answer
8k views

A easy way to create buffer in QGIS?

In the old version of QGIS creating buffer was relatively complicated task. Basically you had to save your layer as a new one with metric cylinder CRS in order to calculate distance correctly. If ...
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1answer
51 views

Extending (buffering) set of polygons into empty space only using Shapely?

I have a set of polygons of which I would like to extend the boundaries a bit into empty space, using Shapely. They are not allowed to overlap each other at all. For example creating buffers and then ...
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2answers
60 views

Setting Buffer from GeoprocessingTools with a feature

I'm trying to set up a Buffer from Geoprocessing Tools and i would like to put a Field from the layer as Distance Souce. Here is my code : import processing layer = QgsVectorLayer(path_to_routes, ...
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0answers
15 views

How does buffering objects in a raster data set differ from buffering in a vector data set? [closed]

How does buffering objects in a raster data set differ from buffering in a vector data set? What are the steps on making a raster buffer?
3
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1answer
59 views

Quartiling a vector buffer in QGIS 3.6

I am evaluating Hurricane data that has a radius which 64kt wind speeds were observed for a specific event. The properties of a Hurricane dictate that the wind speeds change in each part of said ...
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1answer
38 views

How to use GRASS v.buffer function in QGIS?

Trying to use the v.buffer function to create a 500-foot buffer (map units are in metres, which is why I put 152.4 meters as the buffer distance) around the boundary of a property parcel (not the ...
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3answers
98 views

Creating square buffers with v.buffer in GRASS GIS

I do not seem able to create a square buffer around a point feature with v.buffer in GRASS GIS v.7.4.4. The documentation states that "Using -s with a point vector map as input data, square buffers ...
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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 ...
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1answer
22 views

Exporting feature class to geometry objects and preserving attributes - ArcGIS, ArcPy

I'm using ArcPy and would like to copy features in a feature class to geometry objects and then perform a buffer on the geometry objects and copy them back to a feature class. I am doing this in ...
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1answer
40 views

Analysing landuse data in a buffer layer

In my project I want to analyse the landuse around some points within a certain radius. So I created a buffer around my points but I have no idea how QGIS could probably tell me what different ...
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0answers
154 views

Drawing “proportional” buffer using QGIS or GRASS?

I'm working on aquatic vegetation and have a shapefile representing floating vegetation in a lake. By some studies, we know that submerged vegetation extends for a certain extension based on floating ...
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1answer
25 views

How to get points around one point buffer area in a table [closed]

I have many points in a table. I want to show points near one point. Buffer area can be 10 or 100 in SQL Server using SQL query.
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0answers
51 views

st_buffer() not preserving the shape of the original polygons [closed]

I am currently trying to create buffers of 5km around polygons of the region of interest. However, every time I increase the radius from 500 metres to 5000 metres, the shape of the buffer is not ...
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1answer
59 views

GRASS: Can v.buffer use geodesic distance like r.buffer does?

Question: In GRASS GIS, can v.buffer use geodesic distance like r.buffer does? If v.buffer can't use geodesic distance, is there a way to do vector geodesic buffering (ideally in GRASS, but I can ...
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1answer
146 views

ST_Buffer conundrum

I have a table in Postgresql with a geom_multiline column which, as the name suggests, is of type MULTILINESTRING and a second column geom_buffer which is a MULTIPOLYGON type. When I perform this ...
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1answer
20 views

Buffer option not available to select in Editor menu of ArcMap?

I need to use the Buffer in the Editor menu of ArcMap, but it is unavailable. What is the problem?
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0answers
22 views

GPX file gets incorrect buffer QGIS [duplicate]

When I try to perform a buffer of 10m on my imported gpxfile (geometry listed as points), the buffer covers more like 1000 km. I tried the same with a line vector file, which seems to work properly. I ...
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0answers
52 views

Buffer in ArcMap with FLAT end lines [closed]

I have a polyline shapefile and I am applying a Buffer tool in ArcMap 10.5 version with line_end_type='FLAT'. The buffer shape obtained has not all the end lines with a FLAT end, some of them are ...
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2answers
130 views

Difference between two polygons in Earth Engine

I have a reservoir and its buffer (see below). I want to do the difference between the 2 so that my buffer is just a contour around the polygon. I tried the 2 following scripts but cannot get the "...
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1answer
39 views

How do you calculate drive times around a point? [duplicate]

For example, if I have an Airport point and I want to create a 30-minute Drive Times buffer polygon around it, how would I do that? I'm currently using QGIS 3.4.4.
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2answers
19 views

Trying to make a toolbox from script buffer to erase to make feature layer

I am trying to take a script that I edited from a ModelBuilder export. I am trying to plug it back in to make a tool that will buffer then erase, and then make feature layers. What am I doing wrong? ...
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0answers
32 views

Calculating building density within buffer (area) using ArcGIS Desktop?

I am using ArcGIS Desktop 10.6.1. I am trying to calculate the number of buildings within a buffer, followed by building density with a buffer I have set to 7km2. I have parcel data that outline the ...
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0answers
21 views

Creating buffer around points (layer + map in the same PCS)?

Currently creating a map of fire stations in LA and want to create a 50-mile buffer around them. My project right now is in NAD 27 / EPSG:26799 (Projected CS). I also managed to save my shapefile with ...
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4answers
475 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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1answer
629 views

QGIS Buffer Not Recognizing All Features in Layer

I'm completing online course GST 101 for QGIS (my version is 2.18.3) and I'm stuck on the Buffer tool. All of my layers are set to CRS "NAD83(HARN)/New Mexico Central (ftUS) (EPSG:2903)" as ...
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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?
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0answers
31 views

QGIS Multi distance buffer units do not align with the main layer

I have a buildings shapefile of Beijing. I know the projection WGS_1984_UTM_Zone_50N WKID: 32650 Authority: EPSG So I would like to create multi distance buffer from a central point but when I do so, ...
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0answers
35 views

Setting NOT within 200m of lakeshore using QGIS?

I tried to follow the training manual but I met some problem. When I deal with NOT within 200m of the lakeshore, I don't know how to create the right shapefile. For example, how can I change 0 to 0....
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1answer
25 views

How to build buffers for each polygon, which requires the buffer area approximately equal the polygon area in Google Earth Engine? [closed]

I want to build buffers for each irregular polygon in featurecollections in Google Earth Engine. The buffer area is required to approximately equal the polygon area. I am very new to GEE.
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1answer
21 views

Avoiding/cleaning buffer artifacts in R

I'm trying to create a buffer around a multi-linestring object with st_buffer. Here's my initial attempt: library(rnaturalearth) library(dplyr) library(sf) library(rmapshaper) proj_sahel <- "+...
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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?
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1answer
145 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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0answers
68 views

Fixed distance buffer is oval in QGIS?

I want to create circles of diameter 20m in QGIS. I create a point and then use vector - geoprocessing tools - fixed distance buffer. My problem is that the size is crazy and worse, the shape is not a ...