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

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2
votes
1answer
46 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 ...
3
votes
4answers
439 views

ArcGis 10 - create polygons as % of original

Could someone help me with the following? I have a polygon shapefile and need to create new polygons, within the originals, as % of original area. I used buffer by field (Field= new area as %) but the ...
1
vote
1answer
16 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
27 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
20 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
25 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
29 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
32 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? ')) ...
13
votes
2answers
791 views

ArcGIS Buffer accuracy problem?

Once again I encounter something very strange with ArcGIS. I perform a buffer analysis on one side of a polyline. There seems to be a serious accuracy problem and I can't figure out what the cause is. ...
3
votes
1answer
55 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 ...
0
votes
0answers
35 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
107 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
27 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 ...
21
votes
6answers
897 views

How to buffer raster pixels by their values?

The pixels to the left represent tree locations and their associated crown radii (i.e. pixel values ranging from 2 - 5). I would like to buffer these raster pixels by their crown radius value. The ...
0
votes
1answer
39 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
686 views

ArcMap 10.1 - Tabulate Area tool “doubling up” for Overlapping Buffer Zones

This question is related to a previous question I asked: Raster Version of Spatial Join (one to many) I used the Tabulate Area tool to crosstabulate values between an overlapping "buffrast" raster ...
1
vote
1answer
34 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 ...
1
vote
1answer
311 views

SQL Data: How to draw circles with a radius based on lat/long data in DB

I have a . sqlite file with many columns, two of those columns being lat and long. I've been searching around for a bit now (don't think I want to be using BuildCircleMbr from spatialite?) but I'm ...
1
vote
2answers
55 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 ...
1
vote
1answer
96 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
0answers
7 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
32 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 ...
5
votes
3answers
322 views

How can I create a “setback” buffer for coastal lines in QGIS?

I've been going a bit crazy in trying to create a "setback" buffer on QGIS for coastal lines in a map projecting this buffer outwards towards the sea. I've managed to create a normal Bidirectional ...
1
vote
0answers
104 views

How to clip polygons within buffer using QGIS? [closed]

I am trying to do the clip operation with polygons in the buffer, so far I'm getting no results. It is working for points in the buffer. Am I doing anything wrong? Basicly I'd like to include ...
2
votes
1answer
82 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
20 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): ...
3
votes
2answers
189 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 ...
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 ...
3
votes
4answers
1k views

Creating multiple buffers using QGIS?

I'm new to QGIS and have no programming skills. Is there an easy/uncomplicated way to create multiple buffers around a line feature?
4
votes
0answers
432 views

How to create multi-ring buffers automatically in QGIS? [duplicate]

I'm wondering if anyone knows of a tool or plugin for QGIS that allows for multi-ring buffers. I've found a post about doing multiple buffers one by one, but was hoping there was a way to do this all ...
1
vote
1answer
78 views

Are there reference manual pages anywhere for QGIS built-in “buffer” and plugin “points2one”?

Perhaps I am missing some quick pop-up help mechanism, but as a relative newcomer to QGIS (having cut my teeth on ArcGIS 10.1), I am struggling to find reference manuals (i.e. explanations of all ...
4
votes
1answer
92 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, ...
0
votes
2answers
35 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
42 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
48 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 ...
0
votes
2answers
472 views

Calculate sum of points within buffer (ArcMap)

I've created buffers around home origins and am looking to calculate the sum of shapefiles (in this case crime) within each buffer. How would I go about doing this? I want to know how many crimes are ...
1
vote
0answers
35 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
40 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
18 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
51 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 ...
1
vote
2answers
161 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 ...
0
votes
2answers
341 views

QGIS regular points around each polygon in a layer (vs ALL polygons)

I have a number of buffered points (some where polygons intersect & are dissolved. I'd like to create regular spaced points grid around EACH polygon -- not ALL polygons. When I do Vector -> ...
4
votes
2answers
380 views

Getting buffer wizard-like speed in Python (vs using MultipleRingBuffer_analysis)

I've got a script that takes a single input polygon feature, throws 10 buffers around it at tenths of a specified input distance, and then symbolises the output based on an existing layer file. ...
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 ...
2
votes
2answers
60 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 ...
1
vote
0answers
38 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
1answer
50 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
1answer
53 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 ...