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

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166 views

Multi-Ring Buffer Methodology

When creating a multi-ring buffer I see two methodologies: Create buffer around feature, buffer the resulting buffer, and repeat for as many rings as required. Using the initial feature to create ...
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2answers
141 views

Counting buffer overlap in QGIS

For my thesis I'm modeling the identification of recreation areas. Therefore, there has been a survey where people were asked to specify where they recreate. They had to indicate this place on a map ...
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1answer
543 views

Arcpy.Buffer_Analysis Does Not Create Feature Class

import arcpy arcpy.env.workspace = r'c:\data' fcs = str(raw_input('Please enter the layers you would like to buffer: ')) dist = str(raw_input('What would you like your buffer distance to be? ')) ...
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1answer
176 views

QGIS 2.6 Buffering issue

I'm running QGIS 2.6 on a Mac, and trying to create buffers around a point shapefile. The process seems to work: (Vector>Geoprocessing Tools> Buffer(s), I select my input layer, leave the segments at ...
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0answers
91 views

Proper size of buffer to represent village boundary using Geonames populated places

I am trying to estimate population for each Geonames populated place (PPL) in Tanzania. There are about 8000 PPL, represented by point features, however population data is missing. I used ArcGIS to ...
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1answer
155 views

QGIS: How to add a second polygon that is exactly 5km larger in all directions?

Given is a map with an airport. Within a distance of 5km around the runway there is a so called no fly zone for drones (in Switzerland). I want to show this zone in a map. What I would like to do is ...
2
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1answer
258 views

Trouble buffering a vector layer in QGIS with PyQGIS

I am working on a script that imports a .csv layer that has lat long coordinates, which I then want to buffer in feet. I've created a vector layer from the .csv file and tried to set the coordinate ...
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1answer
245 views

How to create buffer around point having projection 4326

I am trying to create buffer (in meters) around point(long lat alt) which is in projection 4326 with below code. But it is not giving expected output. SELECT ST_AsTEXT(ST_Buffer((ST_GeomFromText('...
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1answer
3k views

calculate the population inside a buffer with census data

I have population data matched with polygons and a set of points that I have drawn buffers around. Assuming that the population within each geographical area, i.e. the polygons, is evenly distributed, ...
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2answers
742 views

Calculate area size within a buffer

I have a park polygons layer and a set of points which I gave a 1000m buffer. For each of them I had calculated the area size with calculate geometry. So with which tool could I calculate the size of ...
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1answer
244 views

Buffering selected polygons within same feature class using ArcGIS Pro?

The limitation below applies only to ArcGIS Pro versions 1.0 - 1.2. When editing in ArcMap a workflow I used to create a polygon feature with a donut polygon in the same feature class around it was ...
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0answers
89 views

Problem with ST_SummaryStats, ST_Buffer, and casting between geometry/geography types

I have a test raster that covers the world ((-180 90), (180 -90)). The SRID is WGS 84 (EPSG:4326). Values for cells in the north-western quadrant ((-180 90), (0 0)) are random integers in the range 1 ...
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1answer
162 views

How to do a buffer operation for a polygon drawn by the user using python in QGIS

I have a polygon drawn on the map canvas.Say the polygon would be drawn by using "Measure Area" tool in qgis.Now, I want to do buffer for certain distance around that polygon.I can see the below ...
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1answer
1k views

How to create buffer on one side of a stream in ArcGIS?

I need to create a buffer around waterfront park sites. But I only want "half" of the buffer --- the "half" that coincides with the side of the water body where to park is. In addition, the buffer of ...
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0answers
47 views

Multibuffer in arcpy is too slow?

I have to make multibuffer to a several shp's (30 or +) and with this code the it takes 30 minutes or more. import arcpy,time,glob,os def multibuffer (probe,Zona_trab,nombarch3,recortes2): x=...
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2answers
77 views

FID attribute for each circular buffer polygon

I have a point shapefile "Negative_vel". With the command Analysis tools-Proximity-Buffer and selecting 50m as a linear unit and dissolve type ALL I created a new .shp "Negative_vel_buffer50m". But ...
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1answer
92 views

Buffering in km in NAD83 QGIS

I need to create a 32.1869 km (20 miles) buffer around my attributes, but the problem is the CRS needs to stay in NAD83. Is there a work around so I will be able to create buffers in km but still have ...
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181 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. (...
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1answer
168 views

Use ST_Buffer with a conditional distance based on an attribute

I am quite new to postgres/postgis and are still learning basic skills. I have imported a pointlayer shapefile into my postgres database. I need to make a buffer of varying radius around the points ...
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1answer
795 views

Calculate population within radius

I have population data matched with polygons and a set of points that I have drawn buffers around. Assuming that the population within each geographical area, i.e. the polygons, is evenly distributed, ...
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0answers
249 views

Multiple ring buffer (and query) in arcgis Silverlight

How could I build a multiple ring buffer/query analysis in my silverlight project? I have a working evacuation zone analysis in my project where I can query all elements within a specified distance ...
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1answer
143 views

How does ArcMap buffer linear features?

Two methods of selection in ArcMap that I thought would be the same are in fact not equal. I created a 3 mile buffer around a single line feature (approx 6mi in length). I'm working with parcels, as ...
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2answers
188 views

QGIS Layer Style - Adding intensity/color if elements overlay

I have a layer with thousands of points. I have been asked to represent this layer in way that can be easily seen the level of concentration of points in the layer. So when there is much point ...
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2answers
92 views

Buffer Problems While Using Model Builder

I've created a model that is supposed to allow a user to select an area of road and will then highlight the attributes within a user-specified buffer distance from the selected area. This is what I've ...
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0answers
78 views

Displaying buffer around feature using population values in ArcGIS for Desktop?

I am working on a project that is about park accessibility. I wanted to display a buffer from a park that shows potentially 3 acres/3000 population. I am using Census tract data and I have a shape ...
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2answers
2k views

Buffering continuously throws error “Background Server Threw an Exception” (Error 001143). Why?

I have written a code to create 1 meter buffers for features of converted feature classes (from rasters). I want to dissolve by the field "Class" so that I will have significantly smaller datasets to ...
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2answers
199 views

Create a buffer in decimal degrees

I am working with data that are unprojected (they are in lat/lon) and for every point I want to create a buffer of 800 meter. How can I construct a buffer of 800m. but give the distance in decimal ...
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1answer
350 views

Model Builder - Integrating Select by Location and Buffer

So I'm trying to create a model tool in ArcGIS 10.1 that will integrate select by location and buffer. These are the features that the user is supposed to be able to choose: Select Layer by ...
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1answer
198 views

How to compute tabulate intersection in QGIS?

I have a base layer of census data in census tracts (polygons). I'm looking to intersect those tracts with a buffer layer but I only want to include those census tracts whose area is over 50% within ...
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2answers
33 views

Model Builder - Using Only Certain Fields

I have to use ModelBuilder in ArcGIS 10.1 to create a mix of two tools: buffer and select by location. However, I'm supposed to let the user only enter certain information, and have other fields be ...
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1answer
55 views

Road network comparisons - how to extract roads that do not completely fall within the buffer

I am trying to compare how well one road network aligns with another - I have created a buffer around the first network and would like to select only the roads from the second network that fall ...
2
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1answer
40 views

On-The-Fly ModelBuilding

I am wondering to change and alter a model on the fly. I have a whole process( model for the rest is done) that relies on different settings for buffers, and what I am trying to do is after I am not ...
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3answers
111 views

A mistake in very easy python code (Buffer 1 - Buffer 2- Erase 2 fom 1)

I need to make 500m rings (not full circle) around points (cities). I try to make 1. buffer: 2500 - 8500m (each 500m) and second buffer 3000 - 9000 (each 500m) and then erase 2500m from 3000m, 3000m (...
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2answers
1k views

Correct use of buffering by field (distance) in ArcGIS for Desktop?

I am trying to create a buffer in meters around some points using a field with the distance. However I cannot assign a distance type to use and by default I assume it's doing decimal degrees (I am ...
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1answer
64 views

Automation of Land Use composition in ArcGIS

I am using ArcGIS 10.1 and I have two shapefiles I'd like to process: A Polygon shapefile with 1000 features representing lakes covering a specific area, and; A Polygon shapefile with the Land Use ...
6
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1answer
162 views

Create 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 ...
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1answer
1k views

Converting a buffer polygon to polyline

I'm trying to complete the following steps. What tools should I use? Convert 2km buffer polygons into polylines Select random point along these lines for each feature using Random Point tool ...
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1answer
247 views

How do I create a projection file using GDAL

I am trying to obtain a buffer from a polyline file using GDAL with the following function def createBuffer(inputfn, outputBufferfn, bufferDist): inputds = ogr.Open(inputfn) inputlyr = ...
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1answer
112 views

ArcGIS bufferzone projection

I have a point shp file of 445 points around the globe, that i need to create buffer-zone of 10 km around each point, the points shp file is in wgs1984 geographic coordinate and wgs1984 platte carre ...
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1answer
43 views

Measuring roundness using buffers around centroids [duplicate]

I'm trying to measure the compactness (roundness) of some 800 polygons of different shape and size. I created the centroids and what I want to do now is to buffer those centroids with the exact same ...
2
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1answer
95 views

Isolate features within buffer of another feature - QGIS

I have 2 shapes - one representing line features of pipes, another of roads. I would like to create a separate shapefile consisting only of the pipes that lie within 20m of the roads. Only the ...
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2answers
91 views

Assigning land values within buffer using ArcGIS for Desktop?

I'm new to ArcGIS and having some trouble getting this done. I have a layer consisting of points of bird nesting sites and I have created a multiple ring buffer around this site, with rings at 5 km ...
3
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2answers
1k views

Buffer Polygon, BUT Inside and Only for a Distance

There has to be an easy way to do this. Been plugging away for an hour and I don't know if I am brain dead or what. What I need to do is buffer a polygon on the inside, but only for 500 metres. If ...
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1answer
446 views

Creating a buffer - ArcGis Javascript API

How can I create a buffer that is based on the shape of the geometry that has been drawn. My map application creates a default square buffer extent and I want to create a buffer round a circle based ...
2
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1answer
157 views

Water feature growth

I have a water feature layer which includes rivers, lakes and streams. I want to create, essentially, a buffer of these features equal to that of a 50cm increase in elevation from its current boundary....
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0answers
99 views

Is it possible to “re-buffer” river polygon dataset? [duplicate]

I've river polygon data representing the water quality. This polygon data were derived from polyline dataset according to a buffer distance in the attribute table. Unfortunately I don't have this line ...
2
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2answers
1k views

What's the best way to determine if a point is within a certain distance of a GEOJSON polygon?

What's the best way to determine if a point is within a certain distance of a GEOJSON polygon? Should one use TurfJS buffer method (https://github.com/Turfjs/turf-buffer#turf-buffer)? Can one perform ...
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1answer
300 views

buffering very short line segments with a flat end

I need to buffer a collection of line segments, with a flat shape (corners) at the line ends, as opposed to round. 99% of them work fine in ArcGIS, but some individual line segments are quite short (2-...
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2answers
36 views

How to find “empty” buffer?

So I have lines(road network) and buffers around them. I need to find "empty bufers" whose lines is missing (pic below). Lines have attributes of buffer width, but it is incorrect in some cases (does ...
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1answer
336 views

How can I join a buffer layer to the layer it was created from?

I have two relevant layers for this problem: Real estate parcels (point data) Multiple ring buffer layer - contains multiple buffer rings around each particular real estate parcel. (0.5, 1, 1.5, ...