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

learn more… | top users | synonyms

1
vote
1answer
21 views

Buffer View With SpatiaLite and QGIS

Creating a dynamic buffer with PostGIS the following view is working: CREATE VIEW buffer500m AS SELECT gid, st_buffer(geom,500)::geometry(polygon,31492) AS geom FROM point; Unfortunately this query ...
4
votes
1answer
48 views

Buffering Points Directionally

I have about 10,000 points that I want to apply a partial circular buffer to based on an angle, from -30 to 135°. A similar question for polygons seems to have been answered here, but I cannot make ...
0
votes
1answer
24 views

Use turf.count with turf.buffer dynamically

I have this code where I'm trying to create a buffer dynamically from a draggable marker and then count how many points fall insed this buffer. As of now I can drag the buffer around without any ...
0
votes
1answer
11 views

How to set a label's buffer color in a mapfile?

I would like to set a white buffer around labels in a mapfile (Mapserver version 6.2.1). In the official documentation, I can't find a specific parameter for this... I have tried the SHADOWCOLOR and ...
0
votes
0answers
38 views

For every point create a wedge

How does one create a wedge polygon from a point? If I have 2000 points, I want each to have a wedge starting at each point with each point having a defined azimuth that the wedge points toward. That ...
0
votes
0answers
22 views

PyQGIS point buffer with OpenLayers base map

Using PyQGIS, I desperately need help on creating a buffer around a point in a node layer and then selecting features from a trails layer that fall within the buffer. When I load the shape files ...
2
votes
1answer
34 views

Multiple Ring Buffer in ArcPy Generates Single Ring

I'm running a simple multiple ring buffer using ArcPy. My goal is to generate a multi ring buffer for each pond in my dataset of 50,000. Here's the line of code: ...
3
votes
1answer
37 views

Extending buffer zone

I am working in ArcMap 10.2 (and Modelbuilder) and I would like to solve the following problem: I have Buffer A (single part) and Buffer B (multipart). I would like to extend Buffer A with Buffer B ...
1
vote
0answers
39 views

Variable buffer radius in ArcGIS JavaScript API?

I'm hoping someone can help with this, I'm trying to combine the following Esri samples, to end up with the ability to create buffers based on a variable radius, that will then query data within the ...
2
votes
1answer
57 views

Python code for decreasing polygon size based on percentage?

I would like to decrease the size of polygons by percentage and not by distance in order to implement this into ModelBuilder to loop over a number of polygons. To my knowledge this tool is available ...
1
vote
1answer
35 views

Iterating through a point layer to create & sum distance rasters

I'm writing an Arcpy program to process data in a layer of several hundred points ('ptsLyr', from file 'ptsFile'), each of which has its own ID ('RecordID') and an associated value, 'radius', that I ...
2
votes
2answers
32 views

Assigning values of points outside a buffer to points within a buffer

I have 10m buffers around line features and a point shapefile which has some points intersecting the buffer. I would like to take each point that falls within the buffer and assign it the value of the ...
1
vote
1answer
23 views

Euclidean distance outside a Polygon (ArcMap)

I got some university coursework to analyse the best potential areas for a residential development project and I'm currently doing multi-criteria evaluation. One of the shapefiles in the dataset given ...
1
vote
1answer
33 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 ...
1
vote
2answers
32 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 ...
0
votes
1answer
36 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? ')) ...
1
vote
1answer
33 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 ...
0
votes
0answers
39 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 ...
0
votes
1answer
113 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 ...
1
vote
1answer
39 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 ...
0
votes
1answer
43 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 ...
1
vote
1answer
119 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, ...
1
vote
2answers
60 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 ...
3
votes
1answer
59 views

How to Buffer selected polygons within same feature class using ArcGIS Pro?

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 to: Digitize the polygon Use the Buffer from the pulldown on the ...
1
vote
0answers
9 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 ...
1
vote
1answer
36 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 ...
2
votes
1answer
95 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 ...
0
votes
0answers
21 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): ...
0
votes
2answers
36 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 ...
1
vote
1answer
44 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 ...
2
votes
0answers
55 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. ...
0
votes
1answer
52 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 ...
4
votes
1answer
110 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, ...
1
vote
0answers
47 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 ...
0
votes
0answers
22 views

Buffer Zone and Great Circle

I am using the geoPHP library to calculate the buffer zone of route. It works fine in case of Rhumbline routes, but among my points I have some of them that are connected with "GreatCircle", is it ...
0
votes
1answer
42 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 ...
0
votes
0answers
20 views

Creating Pie Chart within buffer using QGIS?

I am working on a project which is about Habitat analysis for Polecat using QGIS in Schleswig-Holstein. summary of project: Polecat vehicle collision occurs frequently in Schleswig-Holstein. This ...
2
votes
2answers
56 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 ...
2
votes
2answers
53 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 ...
1
vote
0answers
39 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 ...
1
vote
2answers
206 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 ...
2
votes
2answers
62 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 ...
0
votes
1answer
59 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 ...
1
vote
1answer
60 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 ...
0
votes
2answers
26 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 ...
0
votes
1answer
36 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
votes
1answer
37 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 ...
1
vote
3answers
82 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 ...
1
vote
2answers
175 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 ...
1
vote
1answer
27 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 ...