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

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2
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0answers
62 views

Zonal Statistics Freezing QGIS 2.2

Running on Windows; 8gb memory, 500gb HD, i5 cpu; Raster file: 250mb I am having a problem with zonal statistics advancing past 17%. I am trying to run statistics on a crop grown in certain counties. ...
2
votes
1answer
86 views

Problem with matching a buffer in Openlayers and the same buffer in PostGIS query

I am using a buffer tool to create a buffer on my base map in Openlayers. In addition to creating and visualizing this buffer, I pass the center point and radius to a query. The query collects all ...
3
votes
1answer
143 views

How to create a buffer on a linestring with varying or increasing/decreasing width

I want to buffer rivers/streams for a topographic map. I'm using a PostgreSQL/PostGIS database. Usually, I create buffer with ST_Buffer with a constant width. For example, the width of a river buffer ...
0
votes
1answer
50 views

Remove buffers of overlapping buffers

I work with ArcMap 10.2 and would like to remove buffers of the overlapping buffers, but not all overlapping buffers. So for example: I would like to remove the buffer in the middle and remain the ...
0
votes
0answers
16 views

empty buffer qgis

Help! I am trying to use three buffers to select three different sets of polygons. The buffers are from a .txt file with lat and long in decimals. I made a shapefile using North America Albers (I live ...
1
vote
1answer
74 views

Select point with highest value within a buffer

I work with ArcMap 10.2.1 and I created buffers around points. Some buffers contain many points and others just one. I would like to select one point for each buffer, but the points can represent ...
2
votes
1answer
78 views

Remove overlapping buffers

I have put a buffer around points from a point data set. But some buffers overlap each other. Now I would like to remove all the buffers (from the data set) which overlap another buffer. Does ...
0
votes
0answers
18 views

buffer in qgis from layer text delimited

I have a layer of polygons in British Columbia, Canada in WGS 84 which is fine. Later I created shapefile of three points (using decimals for lat and long) through the add shapefile as text delimited ...
0
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0answers
38 views

how to mark certain distance alongside a coastline and saved as kml to import to google earth?

Hi all I would like to mark the region of 200 nautical miles away from the coastline, how can i do this? Thanks in advanced...i already try the buffering function on qgis but dont know how to create a ...
0
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0answers
41 views

Intersecting Overlapping Polygons Individually in ArcGIS

Map Layers: -Census Tract Shape File w/Population Data -Set of Store Locations with 5 Mile Buffers (Significant Overlap Between Buffers) I have create feature layers for both and I am trying to ...
0
votes
2answers
160 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
57 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
41 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
207 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
589 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
0answers
24 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
120 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
61 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.
0
votes
0answers
109 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
102 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
67 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
126 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
60 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
37 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
97 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
71 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
2k 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:
11
votes
4answers
690 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
54 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
206 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
79 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
422 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
104 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
303 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
100 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
42 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
votes
0answers
152 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
61 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
297 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
1answer
127 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
188 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
123 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
65 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
41 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
184 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
211 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
155 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
185 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
69 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. ...