Questions tagged [buffer]

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

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176 views

How to convert a polygon to a line? essentially reverse buffering

So basically I've got this data that some other company sent me and instead of them sending it in line format like all the other companies, whatever troll works there just decided to send a 25meter ...
39 views

Writing a script that identifies polygons within a certain distance

To start with I have no scripting, coding or programming knowledge. I have access to Mapinfo and QGIS. The work space will contain point and polygon data for many different things such as Tree ...
303 views

Creating buffers using JSTS + ES6 modules not working

Creating a buffer from a Point or other Geometry objects in JSTS seems to be quite simple when reading the documentation, but still I can't produce a buffer from a Point in my React application. Let ...
113 views

Counting how many buffers cover centroid in QGIS?

I try my best to explain my problem in english: We use QGIS. We have a shapefile that shows a city divided in 277 areas. We have computed the centroids of each of these areas. Next step we have ...
39 views

Calculate Values from a raster surrounding a list of addresses

I have a list of addresses and I have geocoded into a shapefile in ArcMap 10.4. I've also made a raster that stores NDVI data (with water masked out as it will skew the values we are hoping to obtain ...
154 views

QGIS 2.18 buffer [duplicate]

I'm trying to use fixed distance buffer, and had a few questions. One, what units is the distance being measured in? I assumed meters, but after doing a test run it clearly isn't. And two, what is "...
452 views

Creating ellipse in QGIS

I want to create an ellipse around a point. I have the lat/longs of the point and the length of semimajor and semi minor axes in a CSV format. Is there a way?
90 views

Point from FeatureSet as Input to Python script tool?

I'm looking to use a point on the map provided through a FeatureSet as an input to both a buffer and Select by Location. I have created the geoprocessing tool that works, but am having difficulty with ...
106 views

SQLITE - Buffer 30 m

I have a DB in SQlite with several layers. I would like to perform a spatial analysis, by buffering several water lines with 30m from origin. I am using DB Manager in QGIS 2.14 and the SQL statement ...
244 views

Sqlite ERROR: Too many connections: max 64

I would like to use the ST_SingleSidedBuffer SpatiaLite SQL function to create one-sided buffers around all lines in a layer. The following functions works fine, until the 64rd iteration. Then the ...
455 views

Buffering point shapefile using gdal/ogr: how to copy over input attributes to output shp?

Editing my previous question which asked the best way to buffer a point shapefile in python to add more detail and clarity to what I'm looking for. I have found a method here to iterate through an ...
282 views

How to use spatialite SQL functions in GDAL/OGR

I would like to create one-sided buffer geometries around linestrings. I found this ST_SingleSidedBuffer SpatialLite function that I would like to use in my Python script. When I run the function ...
75 views

How to join a buffer (point) to a line in QGIS 3.0 modeler?

Is there a way to join an output buffer of a point to a line in QGIS 3.0 model processor? This is being added to a larger model so a standalone script wouldn't be practical. I am not sure if this is ...
37 views

Various items in a buffer [closed]

New to QGIS and really all things GIS. I'm looking at specific types of attacks in a region. Surrounding these attacks are other points like schools, clinics, political buildings, etc. I'm trying to ...
66 views

Measuring a Buffer

If I create buffers around coordinate points using a linear unit of measurement, is the distance I input the radius around the point or diameter? For example, if I input 800 meters, will it form a ...
230 views

Using Buffer areas to calculate population in ArcGIS Desktop?

I'm trying to figure out a process in ArcMap that will be able to analyze the approximate number of people living near transit stations. I'm eventually going to turn this into a Python script, but I'...
48 views

Setting shapefile points size to actual acerage using QGIS?

I have a shapefile that has lat/long points data of specific facilities in the US. This data is joined with census blocks group population data because eventually I want to calculate how many people ...
147 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 ...
85 views

Generating a buffer of a vector line based on raster values where the vector intersects a raster

I am trying to figure out how to buffer a vector shapefile with a variable distance (in QGIS). However, the variable distance needs to be dependent on the value of a raster (DEM) where that vector ...
763 views

Creating Vector Buffers in QGIS 3

I am mapping the accessibility of job opportunities in Detroit for those who rely on public transportation. To do this, I need to create a circular buffer surrounding each bus stop with a radius ...
70 views

Creating Raster that sums up input polygons using QGIS?

I am using QGIS and I have a shapefile with buildings. From these buildings, I have built Buffer with variegating radius. The Buffer also have data about the demand for Parking spots for each building....
61 views

How to offset points from a coastline

I need to create a set of points with a fixed spacing and given distance from a a georeferenced coastline. My idea is trying to obtain a parallel line and then placing points on it. To do the first ...
64 views

Extracting data from increasing, multi-concentric buffers around each focal point in a vector layer

I have a dataset (vector layer) with 150 focal points, each of them retaining an observation of several ecological variables (attributes). I want to extract data (sum and average of several variables) ...
91 views

How to update a buffer view with values from another table?

So basically there's a buffer view defined by: CREATE OR REPLACE VIEW niceview2 AS select 'test'::text AS route_type, st_setsrid(st_union(st_buffer(a.geom, 25::double precision)), 27700) AS geom ...
161 views

Visibility tools for ArcGIS Desktop?

I've been trying to create visibility areas for CCTV in my city. Obviously simple geoprocessing tools aren't the answer, cause they create results as shown on the photo. CCTV can't look through ...
206 views

I am trying to create a buffer with radius about 100km (from the previous version of QGIS 2.12 it should be equal buffer distance 150000 with EPSG3857 (Pseudo Mercator) - fixed distance buffer. I ...
26 views

I digitized a cyclone track on ArcGIS as a polyline. Then i created a buffer of 100 km using the buffer tool. My parameters when using the buffer are: Distance- Linear Unit of 100km Side Type- Full ...
73 views

“two ways” Reclass QGIS

I'm a forestry technician and I've one question dealing with forest road planning... in order to calculate areas that can be cover by a specific machine (with a given work distance) I do as follow: "...
69 views

3D buffers according to landscape surface in ArcMap

Using ArcGIS (10.3.1), is it possible to create a buffer zone according to the surface with a variable radius (i.e. 5-10-15 Km)? With surface/terrain I mean the landscape, so the buffer would be ...
141 views

I've done this tasks several times but my focus area has only been limited to the state of Mississippi. I wish to put a 50 mile buffer radius around points that fall in the city of DC, Philadelphia ...
156 views

How to select centroids within buffer range?

I want to select the red circled centroids. These centroids must be within the blue buffer.
1k views

Creating Square Buffer in QGIS?

I have a rectangular polygon I want to create another polygon that is 200 metres bigger in each direction from the original. Is there a way to create a square buffer around the original polygon or ...
67 views

Why is my buffer being projected so large? [duplicate]

I have a single point that I would like to make a buffer around. The point CRS is NAD83 EPSG:4269 +proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs. When I created a Fixed distance buffer, ...
2k views

Fixed distance buffer missing in QGIS 3.0

I know its early adopter version, but anyone know why my regular buffer tool is missing? Possibly others too. Ps: I have already tried the other missing feature fix of deleting .qgis2 folder
54 views

Performing Weighted Buffer Analysis in QGIS?

I am running a 5 mile buffer analysis around a business location, with the objective to calculate the percent of high income earners (\$200k+) within that buffer. Normally, I would intersect the ...
588 views

Growing polygons with limiting area and boundary using ArcGIS Desktop?

I need to create polygons of a specific area based upon random points within bounding polygons, but haven't been able to find a tool able to do all these. I've looked at growing Theissen polygons, ...
39 views

I have a series of points that represent oil and gas wells (over 1,000), and an emissions value for each well. I created 3 concentric buffers that represent increasing distance from the well, and ...
26 views

Buffer Not Taking Attribute Table Information

I have joined a spreadsheet to a polyline shapefile. The information from the spreadsheet is present in the attribute table however when I apply a buffer the information is not in the attribute table ...
139 views

Buffering multiple feature classes from dataset based on length using ArcPy?

I am a beginner at Python and for my current project I am expected to list all polyline feature classes within a dataset, find the length, and then perform a buffer analysis based on it's length. This ...
41 views

Applying value to buffer area using ArcGIS Desktop?

The aim of the investigation is to determine the range of pollution concentrations which the paths (purple) are exposed to from roads (the yellow bands represent concentrations at different distances)(...
117 views

Pyqgis Fixed Buffer Creation in Meters with Haversine

On Qgis 2.18, I'm trying to write a python code that allows me to create a 1km, 2km, 3km, 4km, 5km buffer around a selected point feature. To avoid having to reproject things, I'm using the reverse ...
92 views

Expanding polygons and clipping at midpoint?

I have several separate shapefiles with polygon features. The end goal is to maintain separate shapefiles for each polygon but form a contiguous, non-overlapping coverage for my area. Basically, I ...
80 views

Percent of polygon area within multiple ring buffers using ArcGIS Desktop?

I would like to calculate the percent of area of polygons that are within multiple ring buffers of a number of points. The polygons are associated with a specific point so I would like the buffers to ...
76 views

PyQGIS: Setting CRS for Buffer

I know that this is not an uncommon question, but I've struggled to find an answer that works for my application. I'm trying to find the number of nearby permits for any given property. In order to ...
330 views

Using buffer from IDW in ArcGIS 3D Analyst for flood spread?

I have a line in the centre of a road, with the roads elevation attached to its properties. By using Generate Point along lines --> Add Surface Information --> Adding 10 cm to that, and then IDW 3d ...
240 views

Single sided buffer produces no result in QGIS?

I've mostly used ArcGIS Desktop but am trying to use QGIS to do a one sided buffer since I only have a basic license. I have a coastline and want to do an offshore buffer polygon. The line file is ...
144 views

How to define voronoi polygon buffer extend in QGIS from layer extend

I'm using QGIS (2.8.1) Voronoi Polygons Algorithm and I would like to extrapolate them to a polygon layer extend. In order to do this, the tool opens a window asking me to enter a number or expression ...
132 views

Creating multiple non-overlapping rings but unable to tell which fc they surround using ArcPy?

I am using ArcGIS Desktop 10.4. I would like to create multiple ring buffers surrounding my polygon localities. My buffers should not overlap and I need to know, which location each of my buffers ...