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

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5
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1answer
84 views

Cutting a circular buffer via Arcpy

I am currently working with compressor stations on centerline routes. These compressor stations have a 3 mile buffer surrounding them. I wish to cut a portion of the circular buffer off. These cut ...
0
votes
0answers
15 views

How to create new field using the values of one attribute column multiplied by a constant number in Qgis or ArcGIS [duplicate]

I have point data that has a small length attribute - I want to times this length attribute by a constant number (I need to trial a few different constants) to find the diameter of a protection zone ...
0
votes
0answers
13 views

How can I prevent markers from being clipped?

I have a series of point that I want to draw circles with varying radii around. The radii depend on the zoom level and represent a 1.1 mile circle from the point. I'm running into an issue where the ...
0
votes
0answers
49 views

Using custom shape files as buffers in ArcGIS [closed]

I would like to use a custom shapefile as the buffer shape for a project that I am working on. I have created a buffer around a compressor station of 3 miles and am planning to clip the lines that ...
0
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0answers
30 views

Merge multiple buffers [duplicate]

Is there a possibility to merge multiple buffers into one single buffer? Illustration: I would like the green buffer to be of one single piece.
0
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0answers
37 views

Removing Routes Within a Buffer

To preface, I have stations on lines, which the stations have a 3 mile circular buffer. I am trying to isolate the lines that those stations reside on from the lines that do not have stations (i.e. ...
1
vote
1answer
45 views

How to create a feature mask with a polygon? [closed]

I need to create the SAME polygon shape shown in the image below, just 2 miles larger. The buffer wizard tool is only creating circular buffers around the irregular shape below. Any ideas on how to ...
0
votes
1answer
24 views

How do I assign point value ranking system to multi-ring buffers?

I created a multi-ring buffer of different distances, and I want to assign a point ranking to each distance as part of my analysis. So for example: farms within the 0-25 mile buffer would get 4 ...
-1
votes
1answer
34 views

Counting points in concentric circle buffer zones of different sites in a map? [closed]

I produce concentric circles of 200 and 500 m buffer zones to see water points within each buffer zones. The buffer zones are created throughout my study area. How can I count the points found in ...
0
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0answers
43 views

How to go about buffering different values in a field separately?

I have a clip of urban areas where the names are all messy with hyphens, apostrophe's etc so have decided to use the number value for each name to populate a list. My aim is to do analysis on each ...
1
vote
3answers
32 views

Join attributes by location doesn’t appear to be including data that it should

I am trying to calculate the number of bus stops which are within 400m of c. 100 properties that are in relatively close proximity to one another. Using MMQIS I created the 400m buffer for the ...
0
votes
1answer
26 views

Which suitable buffer distance to choose for a kernel density analysis to deal with edge effects?

I would like to run a Kernel density analysis on point features in ArcGIS 10.2 for hotspot detection, and to do it is recommended to apply a buffer zone to the study area in order to reduce the edge ...
0
votes
0answers
38 views

Updating a polygon with an attribute from ALL intersecting polylines

I have a polyline layer with road information such as the road it beings from and the road it ends at. Some of these are digitised incorrectly and I am trying to pull out the road name (or unique ID ...
0
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0answers
16 views

Draw (adjacent) GIS-shapes, reduced and “rounded”

as the title says: I want to draw (C#, WinForms application) adjacent polygons stored in an GIS-database (SQL Server 2012, geography-datatype). The data source is OpenStreetMap administrative ...
2
votes
1answer
51 views

Why does Select by Location select points outside search radius?

I'm using Select by Location to find wind turbines within 5-km of a center point feature -- why does this command also select nearby turbines? The image below shows my selected points with a 5-km ...
1
vote
1answer
32 views

Calculating area of residential area wihin multiple ring buffer in ArcMap?

I need to calculate the size of residential area within 0-250m, 250-500m and 500-750m of a bus stop. I have made a multiple ring buffer around the bus stops. And I have a shapefile of the residential ...
0
votes
1answer
56 views

How to get arcpy to access attributes of a geometry?

As a novice python programmer I am struggling mightily with my code. What it is supposed to do is Buffer a bunch of points with four distances (100, 200, 300, 400meters) Calculate zonal sum for ...
1
vote
0answers
33 views

How to create a real size buffer around a point in qgis

I have a postgis pointlayer in EPSG:3857, added to a project that is set up with OTF ON to project everything (other layers) to EPSG:3857. In postgis, I defined a view to dynamically create a buffer ...
2
votes
1answer
73 views

Create random points in ArcGIS on a polyline in a polygon

I am trying to create 100 random points, 1 within 500m of 100 points I already have. I have created a buffer and can easily create 1 random point in each, but now I want those points to lie on a ...
1
vote
1answer
54 views

Buffering line in ArcMap is creating smaller buffer than expected?

When I buffer a point (red dot on image) by 3 miles, it is 3 miles on all sides. When I buffer a line (blue line on image) by 3 miles, it is more like 2.67 miles on the sides parallel to the line. I ...
1
vote
1answer
93 views

How to create dissolved buffers in QGIS with PostgreSQL/PostGIS?

Creating a dynamic buffer in QGIS I use the following query: CREATE VIEW buffer40units AS SELECT gid, st_buffer(geom,40)::geometry(polygon, 31492) AS geom FROM point; Now I want to dissolve ...
2
votes
0answers
38 views

ST_Buffer with segment AND endcap parameters

Making a QGis plugin that buffers a line and I want to declare a high number of segments and a flat endcap. ST_Buffer(geom, 40, 25, 'endcap=flat') This doesn't work with both parameters entered, ...
1
vote
0answers
44 views

Catchment area calculation

I have a conundrum. I am trying to shortlist optimal physical locations in my county for developing recycling centres that serve the population. I have a vector point layer of the centre point of ...
2
votes
2answers
56 views

Create buffer along shoreline near sample site

I want to look at the land use on the shoreline of a river relative to a specifc point on the river. I have created a point on the shoreline using the Near tool. Following this I am having trouble. I ...
1
vote
1answer
36 views

Point buffer problem

I have a point feature that I would like to buffer to select segments that are within 15 meters of the point. The code I have is working but it's influenced by the map scale. Zooming in or out changes ...
0
votes
0answers
30 views

How to make SQL Server buffer only on one side?

Is there any way to make a buffer on a linestring only on the right or the left side? If not, is there any way to translate the linestring?
1
vote
0answers
43 views

Displaying symbology outside map canvas window extent?

Say we have equally distributed x,y mesh vector file. Each coordinate has a map-unit based diameter circle symbology. If we zoom into a region of the map canvas far enough, some centroids exist ...
1
vote
2answers
57 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
88 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
50 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
22 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
48 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
1answer
64 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
46 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
43 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
1answer
78 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 ...
3
votes
1answer
81 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
51 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
37 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
36 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
67 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
40 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
54 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
64 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
53 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
118 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
72 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
73 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
300 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
75 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 ...