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

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2answers
252 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
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0answers
70 views

How to Simulate Venn Diagram of Buffers using QGIS?

For the sake of simplicity, suppose I have only 2 points on one layer. Point A have population of 100, and point B have population of 150. I do find buffer of these 2 points and it is intersect. I ...
0
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0answers
51 views

Zonal statistics won't work after re-projecting vector layer

I have qgis 2.0. I want to analyze raster information within a buffer of 30 miles around a vector layer of cities across the world. However, both the raster and the vector are in WGS84. I have no ...
3
votes
2answers
303 views

Creating square buffer in qgis

How can I create a buffer with square ends along a line segment in qgis? I've buffered lines using v.buffer in the GRASS plugin, but the -c option for square ends is not exposed in that interface. ...
16
votes
5answers
678 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
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0answers
25 views

buffer of clusters in a sparse matrix

I work with MATLAB. I have a sparse matrix where I identified different clusters. The value within each cluster is equal, while each cluster has its own unique value. I have 0s as background (outside ...
0
votes
1answer
204 views

Units of gBuffer from rgeos package

I have this polygon: library(maptools); library(sp) setwd(system.file("shapes", package="maptools")) columbus <- readShapeSpatial("columbus.shp") proj4string(columbus) <- CRS("+proj=longlat ...
2
votes
0answers
14 views

Eliminating/minimizing distortion in 200 NM EEZ buffers [duplicate]

I frequently need to calculate buffers of 200 nautical miles from country or baseline polygons in order to map maritime Exclusive Economic Zones (EEZs). However, I've noticed that when generating the ...
1
vote
1answer
69 views

Is there a tool to buffer features with more than one distance value in GRASS GIS?

I´m looking for a tool like Multiple-Ring-Buffer in ArcGIS, but for GRASS GIS to be able to buffer with different distances but only having to start the process once.
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0answers
135 views

Why does ArcGIS 10 Buffer not provide accurate geodesic buffer?

I created a shapefile following these criteria as recommended for Performing Geodesic Buffering: The input feature class must be a point or multipoint dataset. (shapefile is a point) The input ...
0
votes
2answers
116 views

Low resolution raster conversions to vector yielding millions of single pixel polygons. Trying to merge all directly adjacent polygons

I'm trying to scan plain pdf maps containing color-coded geographic regions and convert them into undifferentiated (I don't actually need them to contain any attribute data) overlays. My workflow is ...
1
vote
1answer
83 views

Analyzing Raster Data From Vector Layer Buffer

I am using QGIS 2.0. I have satellite images of night-time lights all over earth. I also have a vector shapefile of country boundaries including the largest cities on earth. I want to use buffers to ...
4
votes
1answer
164 views

How to maintain right-angles when buffering?

When buffering some polygons I am trying to avoid the curved buffered area like this: I'm trying to do thins within an FME workbench but if someone knows how its done in other software that would ...
0
votes
0answers
70 views

Arcobjects/Arcgis Engine — geoprocessing within a buffer?

I have a point layer and a polyline layer (each contains more than 100k records), I would like to process the polyline layer within point buffer zones. For example, for each point in the point layer, ...
1
vote
1answer
38 views

How to compute drive access to a station based on vehicle origin points? [closed]

I have a shapefile that contains station locations and another shapefile that is the geocoded origins of those who drove to the station. I would like to make a buffer around the station that shows the ...
1
vote
1answer
111 views

Buffer Zip Region Polygon with GeoTools

What I want to achieve is to buffer a zip region geometry with a distance in meters and than get the coordinates of the new (expanded) polygon. The original geometry polygon is parsed from a kml file. ...
4
votes
1answer
79 views

Problems with Buffer tool. Looking for help please

I am trying to create a buffer around different series of lines. I have a polylines file with 1 location shown below: I want an equal spaced buffer that is dissolved around all the lines at this ...
8
votes
5answers
3k views

Performing a reverse clip in ArcMap?

Is there a way to perform a 'reverse' of the clip function in ArcMap, I'm not exactly sure how to explain this so here's a diagram:
13
votes
4answers
894 views

Is there Python library (other than ArcPy) for geoprocessing such as buffer?

Excluding ArcPy, is there any python library which can do geoprocessing, such as buffer/intersect, with shapefiles?
2
votes
2answers
58 views

Calculating loss of value from a wind turbine on surrounding properties depending on distance

I have to evaluate where installing a turbine would be most efficient, depending on wind speed and price of properties surrounding each cell in a raster. The cost on value of properties is computed ...
2
votes
1answer
263 views

Creating buffers that will not overlap in QGIS

I am dealing with a .shp with a number of points in it. The distances between points range from ~300m to 5km. I wish to create a 1 km buffer around each point with as little overlap as possible. Each ...
0
votes
1answer
84 views

Can I “undo” buffering of a point layer in QGIS?

I have point layer, where each point is one tree, about 1300 trees in total. I made buffers around each tree, the buffer being the height of each tree in QGIS 2.0.1. My next step was to use Spatial ...
0
votes
3answers
869 views

Create new layer by selection within ModelBuilder in ArcMap 10?

I have a basic abutters model built so far. Right now I have it set up to: Select a parcel by an expression. Buffer parcel by a value. Select by location which highlights all parcels within the ...
2
votes
0answers
130 views

How to use buffer() in QGIS Value Relation field

When adding a point, I'd like to auto-populate one of its fields (the street address) setting it to a field in the nearest point in another layer (a layer containing all existing addresses). It ...
1
vote
2answers
435 views

How can I create a merged buffer in QGIS then count points that fall within it

I have a QGIS plan which shows ponds (as points in a shape file with an OS tile as a background) within a survey area. I need to calculate the total number of ponds within 1 km of each of the on-site ...
1
vote
1answer
127 views

Creating a point buffer along a road network [duplicate]

I have a road network and have added points indicating fire hall locations. How would i go about creating buffers on those points following the road line. The result am i looking for would create a ...
0
votes
0answers
55 views

Exclude any geometry contained within another in geodjango queryset

I am trying to get a set of non-intersecting model objects my a GeoDjango project. I have a model with a polygon geometry field, and it represents a collection of buffers. The model definition is as ...
0
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0answers
188 views

Create a buffer area for a point c#

I am wondering to create a point/line based buffer zones in order to enhance my understanding for buffer concept in the GIS. The buffer zones can be any circle or region around a point, particularly, ...
1
vote
1answer
68 views

How to restrict buffer extent within land area only?

I need to create buffer for a point feature, but the buffer area will be restricted within the land area only. For example consider the following: A buffer of say 500 km radius is to be generated ...
0
votes
2answers
410 views

postGIS union multiple tables, big dataset, faster approach?

my goal is simple. I want to union a given set of shapefiles. In the shapefile are stored polygons. The data bounding box is germany, so the data is relatively big. I tried to use all functions ...
2
votes
2answers
185 views

Separate a polygon in different polygons depending of the distance to another polygon

I have a reference polygon "R", and others polygons (in grey). I want to separate each grey polygon in multiple polygons, depending on the distance to R with different Buffers : - The red line is R ...
1
vote
1answer
296 views

Creating Buffer from field in Attribute table

I have a shapefile in ArcMap with about 30 polygons and want create an inside buffer, using a different value for the distance of each buffer on each polygon. I was wondering if there was a way to use ...
2
votes
2answers
138 views

Set projection/CRS in map and shapefile to produce buffer

I simply want to create a buffer of a specific size, around a single point. When I create a buffer it uses degrees/ or radians, or whatever, and the buffer is created that covers the whole screen. I ...
3
votes
2answers
74 views

Clipping multipart polygons iteratively

I have a shapefile of buffers (n=10) and a shapefile of watersheds (n=10). Both shapefile contain overlapping features. I would like to clip each watershed feature with it's corresponding buffer, ...
2
votes
0answers
44 views

Wrong pixel sums within buffers in Esri ArcGIS 10.0

I have a raster of Zambia, 100m² resolution (about 650mb). Buffers (single) at 1,2,3,4,5,10,15,20,25,30,50 km. I'm running "zonal statistics as table" in the model builder for all buffers (actually, ...
2
votes
1answer
215 views

How to Buffer based on SQL expression?

Is there any way to optimize this code? It creates two buffer feature classes based on two different fields in the shapefile attribute table import arcpy from arcpy import env ## Set Workspace ...
1
vote
1answer
312 views

Buffer analysis - use of surface area based on DEM

I have one problem and this is that I would like to create a buffer around point. This is simple with ArcMap using the buffer tool. But is it possible to create the buffer considering also the true ...
1
vote
1answer
216 views

How to calculate the intersect two shapefiles [duplicate]

I have two shapefiles. 1. the clinic buffers 500m area. 2. the postcode area. Is there a simple way to calculate the intersect two shapefiles ? I'm using QGIS Dufour. I tried to use fTools to ...
3
votes
2answers
250 views

Need Projection Help to Buffer Lines in QGIS

I am somewhat new to GIS in general, and very new to QGIS specifically (I took one class and we used Arc, which I don't have access to any more). I need to create buffers (1km, 3km, and 5km) around ...
1
vote
1answer
71 views

why are my buffers not lining up with their original points despite setting the layer crs as all the same crs when I reopen my project [closed]

I am having my entire project in pseduo mercator (google earth raster image) and when I create buffers for points and then open back up my project all the buffers are offset from their points. ...
4
votes
4answers
292 views

How to convert result of dissolved buffer into individual polygons?

I am wondering if there is a way to easily split results of a disolved buffer into individual polygons? E.g in the screenshot below all of these buffers are one item, can I split them into individual ...
0
votes
1answer
335 views

Geodjango: Using Lat / Lon to Buffer from Point

I want to have a radius based distance search. To do this, I want to create a buffer around a point object so that I can filter objects that are inside this buffer, a method that I learned based on a ...
3
votes
3answers
329 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 ...
2
votes
0answers
244 views

Buffering a Raster with GDAL and Numpy

I am using GDAL to convert a raster dataset into a numpy.array and then using numpy to buffer the data in the raster. For example, I need to know all the regions within 100ft of a school point ...
2
votes
1answer
162 views

How to load a memory layer into map canvas an zoom to it with pyQGIS?

I would like to load a vector memory layer into the map canvas with pyQGIS. Background is, I create a memory buffer layer around point data. While iterating the points I would like to visualize the ...
0
votes
0answers
172 views

VBA Code to wait until Python returns value

I have written a code in VBA, I am passing parameters to Python and creating a buffer there. After that I am passing that buffer layer and further processing in VBA again. Here is the code for ...
2
votes
2answers
140 views

How to use IFeatureCursorBuffer in VBA

I tried to use IFeatureCursorBuffer to create and dissolve the buffered features.I am trying to get the solution since some days using dissolve and UnionOverlappingBuffers, but not being able to get ...
2
votes
1answer
91 views

Is it possible to automatically update a Buffer FeatureClass when creating new features?

Is there a way I can update the results of my Buffer analysis? I have a roads FeatureClass, and I've built a buffer for it. I will still make edits to the road FeatureClass. Let's say I add a new ...
1
vote
2answers
718 views

QGIS - Continuous buffer image [Heat Map]

Is it possible to have the representation like the one the heat-map like the figure below using QGIS? The way seems to use buffer options, but I do not know how. Does exist any plugin that helps? I am ...
0
votes
2answers
293 views

How to perform a buffer analysis in PostGIS?

Need to Implement Spatial Analysis in Postgresql. Can Any one guide me to accomplish the spatial analysis eg) 2 km buffer for road network layer.