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Questions tagged [buffer]

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

2
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2answers
51 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, ...
0
votes
1answer
15 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 ...
1
vote
0answers
15 views

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

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
votes
1answer
54 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 ...
1
vote
1answer
36 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 ...
0
votes
1answer
20 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 ...
2
votes
3answers
81 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 ...
-1
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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.
2
votes
1answer
72 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 ...
1
vote
0answers
46 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 ...
0
votes
1answer
34 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 ...
0
votes
0answers
21 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 ...
1
vote
0answers
43 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 ...
1
vote
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.
-1
votes
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? ...
0
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0answers
31 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 ...
0
votes
1answer
18 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?
1
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0answers
20 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 ...
1
vote
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, ...
0
votes
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....
0
votes
1answer
21 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.
1
vote
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 <- "+...
5
votes
1answer
87 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,...
1
vote
0answers
64 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 ...
0
votes
1answer
44 views

Continuous buffer from individual polygons in QGIS

I have a stream segment for which I am trying to find a buffer around with criteria as 5m of elevation. So for each straight line within a stream segment, I have found buffer (polygon) for it. Now I ...
1
vote
0answers
21 views

QGIS3 difficulty drawing 150km distance buffer and showing this on the map

I wanted to construct a 150km distance buffer around a city in North America. I changed the project co-ordinate system of the point to WGS84 Mercator North America from WGS 84 Lat/long to enable the ...
1
vote
0answers
41 views

Shoreline assesment via buffer

I've been looking around but haven't found an answer to match. I have a number of endpoint rates (EPR, I'm working on shorelines), and I want to know if it's possible to create a buffer based on the ...
3
votes
1answer
75 views

Buffer with unknown distance by adding numerical values of a column until a maximum

In my QGIS project, I have a vector of polygons representing slope zones around an archaeological site and I want to calculate the area which is necessary to supply the ancient population with a ...
0
votes
0answers
32 views

QGIS dissolves all different shapes into one feature instead of multiple features [duplicate]

I'm pretty new to QGIS and geoprocessing. I have a layer of points representing traffic lights - where each point is a different feature: I wish to create a layer with traffic light junctions based ...
3
votes
1answer
86 views

GEE: How to Create a Buffer Around Canny Edges

In google earth engine I've managed to create a layer using the canny edge detection algorithm (which outputs an image). That layer takes on values of 0 or 1. Now I want to create a buffer around ...
1
vote
0answers
40 views

Create buffer based on the size of a line's length (QGIS) [closed]

I need to create a buffer around a point, witch has to be 1.3x bigger than the length of a given line. I want to automate this process with graphical modeler or pyqgis. So the program should ...
2
votes
2answers
85 views

Got Pacman instead of circle when buffering point QGIS 2.14 standalone C++ application

QgsVectorLayer *circleLayer = new QgsVectorLayer("Polygon", "Circle", "memory"); QgsFeature circleFeature = QgsFeature(); circleFeature.setGeometry(QgsGeometry::fromPoint(geometryPoint)->buffer(...
2
votes
1answer
43 views

Proper output while using geom.buffer in PyGIS?

I am developing a plugin in QGIS using PyQt5. I have used the following code to create a buffer of different distance for different features in a layer. layers = [layer for layer in QgsProject....
0
votes
0answers
34 views

Making different classes create different size buffers/Thiessen polygons based on point data in ArcGIS ModelBuilder?

Is there a way of getting point data with different classes/numbers create different buffers/Theissen polygons in ArcGIS ModelBuilder? For example: If two points are plotted on a map with the ...
1
vote
0answers
32 views

Points from polygon with buffer

How can I get points from polygon considering a buffer zone where within that buffer only one point will be generated. I have a few polygons for suitable locations. Now I want to make points from them,...
2
votes
1answer
27 views

Including buffer to IDW in ModelBuilder

I have created a model with ModelBuilder to interpolate values with the IDW tool, iterating through rows. How can I restrict interpolated values to regions within a 20km buffer? I tried setting the ...
2
votes
1answer
450 views

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 ...
2
votes
0answers
40 views

Searching on the fly within buffer in QGIS

I am using "Unique Values" widget with "Editable" option in QGIS 2.18.3, for my "Name" field in POIs layer to eliminate spellings mistake. "Unique Values" widget fetches all the distinct values in a ...
2
votes
2answers
132 views

ST_Buffer in PostGIS produces different results for the same set of lines

We have a single LineString (a route on a map) made of multiple points (blue line) which we are then buffering to produce an area around it. We have found that everything looks as expected unless the ...
1
vote
2answers
55 views

Buffer Until Intersection using ArcGiS ModelBuilder?

I am trying to use ArcGIS ModelBuilder to create a toolbox that places a buffer of 1 mile around X location, but does not cross major highways. Effectively, I am geo-fencing in real estate comps. In ...
3
votes
0answers
41 views

What is the name of the popular buffer algorithm?

There is a well-known algorithm that I believe is used for the "buffer" function in some GIS libraries and applications. I have a vivid memory of reading the paper that describes the algorithm and ...
1
vote
3answers
114 views

Perfect circle buffer on QGIS Madeira 3.4

Working on a road junction I would like to make a perfect rounded circle buffer of 1 km around this junction in QGIS 3.4. Here is what is look like now.
2
votes
1answer
61 views

Getting the percentage area of intersecting polygons [closed]

I have the polygons for census tracts within New York City. I also have the polygons for the parks. What I would like is % of the census tract area, with an added 400 meter buffer, that is park. I'm ...
0
votes
0answers
15 views

Adding Buffer Wizard function in ModelBuilder?

I am trying to clip a series of raster grids to include into a mosaic. Presently I have made a model that initially reclassifies a grid into one class and then converts raster to polygon to get a ...
0
votes
0answers
39 views

Pixels, distance to line (negative left, positive right) r

I am using r to do some spatial analysis. Here is my project, I am using raster files (that contain information on land use) and a polyline (which is a border between two regions). I am analyzing ...
2
votes
1answer
27 views

GeoTools change buffer style

Is it somehow possible to change the buffer style of the build in GeoTools buffer() function? Or is there a User Definded Function for that? I just saw a different buffer function where one could ...
3
votes
1answer
41 views

Assign points within 150 meter buffer of each other the same unique identifier?

I have a bunch of points on a QGIS map. Each point is a unique sampling event. However, some of these points have been sampled multiple times but there is no common identifier in the attribute data to ...
0
votes
0answers
23 views

Grass-v.buffer error [duplicate]

I want to create oval buffers 450 by 350 m tilted by 45° using the v.buffer-tool from the GUI. When I enter everything necessary and click run, in return I get the following error message (same pops ...
0
votes
1answer
41 views

Finding areas which are inside maximum of 2 buffer zones using ArcMap?

I have a territory with supermarkets. I'd like to find the areas in this territory which has less than 3 supermarket in its vicinity. For that, I created a 1 mile buffer for each POI. Is there a way ...
1
vote
2answers
115 views

Creating a fixed distance buffer from a virtual layer

First off, i'm trying to learn some python to automate scripts for basic tasks i carry out in QGIS (2.18). Below I create a virtual layer (polyline) using the following script: from qgis.core ...