Questions tagged [buffer]

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

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24
votes
1answer
26k views

Understanding QGIS buffer tool units

I have had no luck getting the buffer tool to accept anything but degrees as units of measure. I have found lots of stuff saying the layer needs to be reprojected and saved but it hasn't worked at ...
15
votes
3answers
52k views

Create buffer in meters?

I'm very new to the GIS world, so my problem could be very stupid, but I'm going to try anyway. Objective Given a list of coordinates in longitude/latitude, stored as a .csv file, I want to create a ...
34
votes
6answers
37k views

Creating square buffer around point feature using ArcGIS for Desktop?

I would like to create a square buffer from a point feature but I do not understand the code that goes into it. Similar questions have been asked on the forums.esri website but that was over 10 ...
17
votes
4answers
12k views

Buffering in pyQGIS?

I'm looking for some examples to do simple python scripts in QGIS. How would I do a buffer analysis on a dataset? I can't seem to find much in the manual and QGIS python that quite matches the Esri ...
7
votes
1answer
597 views

Buffering point with different distance toward N, E, S, W using ArcGIS for Desktop?

I want to create buffer polygon(with curved edges) from points like this using ArcGIS for Desktop. distance toward North from a point 5, toward South 1.5, toward west 1, toward East 2. all this ...
19
votes
4answers
6k views

Creating one-sided buffers or parallel lines in PostGIS?

I'm looking for a way to create so-called one-sided buffers or parallel lines in PostGIS. Example: 1. buffer, 2. one-side, 3. both-sides I've found some discussion on the mailing list from 2009 and ...
9
votes
2answers
3k views

How to create an oriented buffer using arcpy?

I would like to create an oriented buffer for every polygon in my shapefile using arcpy. By oriented I mean that I have two angles a1 and a2 that constraint the direction of the buffer. This is ...
12
votes
2answers
8k views

Buffering in meters/km using WGS84 layers using QGIS

I am using QGIS 1.7.4-Wroclaw and working with an SHP layer in WGS84. I want to buffer out to a certain number of kilometers from this layer using the ftools buffer tool. I understand that the buffer ...
14
votes
3answers
4k views

Achieving Flat-End line buffers in QGIS?

I need to buffer a series of lines by 40m, however I only want the buffer to come off the sides and not off either end of the line. I know in ArcGIS there is a "flat-ends" tickbox that achieves ...
8
votes
3answers
5k views

Create square buffers around points in QGIS with Python?

I have x, y coordinates in lat/long and I need to create 5x5 degree square cells around them, with the lat/long coordinates being the centroids. My first option is to create a buffer around the ...
29
votes
11answers
66k views

Performing reverse clip in ArcMap?

Is there a way to perform a 'reverse' of the clip function in ArcMap? I am not exactly sure how to explain this so here is a diagram:
7
votes
1answer
3k 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, ...
11
votes
3answers
4k views

Aligning multiple points to line in QGIS?

I would like to align multiple points to a line, or lines within a layer, using a specified tolerance or buffer around the line objects. Please refer to the sample sketch attached. For the sake of ...
8
votes
4answers
3k views

Improving upon ArcGIS Buffer/Dissolve performance?

I'm wondering if anyone else has experienced significant performance penalties when using the ArcGIS buffer function with the 'dissolve' option on point features. My dataset is a shapefile of 260 ...
8
votes
6answers
8k 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?
6
votes
1answer
2k views

How to create rectangular buffers around points in QGIS with Python?

Using the following code from a similar question (How to create square buffers around points in QGIS with Python?) I am able to create square buffers (5x5 degree cells) around my points. However, I ...
8
votes
3answers
1k views

Is there a st_buffer inverse function, that returns a width estimation?

When you supply a geometry g1 and a width w to the standard OGC function ST_Buffer, it returns a new geometry g2, g2 = ST_Buffer(g1,w) This question is about the inverse: a function where you ...
7
votes
6answers
4k views

Creating polygons as % of original area using ArcGIS Desktop?

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 buffers are created in circles around ...
6
votes
1answer
2k views

Fixed buffers and interior buffers are not working for a polygon that contains a hole

I'm following the online qgis manual available on qgis website. I'm doing the step 21.11.3. (http://docs.qgis.org/2.14/en/docs/training_manual/answers/answers.html#complete-analysis-3). To make it ...
4
votes
1answer
893 views

polygon split with predefined area

I am trying to split an irregular polygon into 120 equal area blocks. I also need a buffer around each new block within the polygon. Is this possible in QGIS 2.12.1?
4
votes
2answers
1k views

Why does the buffer take up whole screen?

I am trying to create buffers around the Hurricane Sandy path I created in QGIS (points are lat/long). I have both points from each day she was tracted and the line I created from it with Points2One....
-2
votes
1answer
10k views

Easy way to create buffer in QGIS 2?

In the old version of QGIS creating buffer was a relatively complicated task. Basically you had to save your layer as a new one with metric cylinder CRS in order to calculate distance correctly. If ...
7
votes
2answers
855 views

Representing uneven tree canopy spread around point in QGIS?

I am trying to make an attribute to show the uneven spread of the crown of a tree using the four cardinal points. I can use a buffer to show one feature, in this case a root protection area. But I ...
3
votes
2answers
550 views

Generating fixed distance buffer including slope using ArcGIS Desktop?

Is it possible to generate a fixed distance buffer including slope using ArcGIS Desktop 10? The distance on the map is not equal to the distance on the ground due to the incline. If the ...
3
votes
3answers
3k views

Count points within each buffer QGIS

What I am trying to accomplish is to find the number of points that intersect a created buffer. I.E. I have a layer called "Buildings", for each building I have fixed distance buffers (<400m). I ...
15
votes
2answers
17k views

Creating “Inner Buffer” using ArcGIS for Desktop?

I am currently searching for how to create an "Inner Buffer" in ArcGIS for Desktop? I have a lot of polygons (houses) in one feature class, and one big polygon (in another feature class). I want so ...
7
votes
1answer
3k views

Inside buffer with attributes in ArcGIS?

How can I create buffers for polygons that: a) lie only inside the polygon boundary, and b) know who their parent is? An example of where this is useful is First Nation Traditional Territories. ...
4
votes
1answer
2k 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 ...
1
vote
2answers
568 views

Selecting isolated polygons which are not donuts but may overlap using ArcGIS Desktop?

I'm exploring a few different options for this process and I'm unsure what would be most effective. I'm trying to find all isolated, non-intercepting polygons in the same layer (not to merge). Most ...
7
votes
1answer
4k views

Calculating size of particular area below buffer in QGIS?

I have a point shapefile of villages where data was collected in Northern Kenya. I created a buffer around those villages. The second vector layer contains polygons defining areas according to ...
5
votes
1answer
319 views

What is the width of the beach of a little island polygon?

This is a "classic" problem, that have no practical utility (see note-1 for applications), but illustrate another GIS problems... We can do some approximations to modeling the situation, the real ...
3
votes
2answers
4k views

Setting linear units for Buffer distance from arcpy.GetParameterAsText()?

I am trying to run a buffer tool as part of script that I will both use as a standalone script and import into ArcToolbox. I'm just wondering, if I use GetParameterAsText for the buffer distance, how ...
9
votes
5answers
2k views

Buffers of public transportation transit times

I'd like to be able to create buffers/zones/rings of transit times using Denver's public transportation system. For an example of what I'm talking about, check out triptropnyc.com - I don't need it ...
8
votes
1answer
986 views

Splitting overlap between polygons and assign to nearest polygon using PostGIS?

My question is quite related to the unanswered Split overlap between polygons into disjoint sets except I'm not using shapely, I'm using PostGIS 2.4 on PostgreSQL 10. I have a table containing ...
6
votes
3answers
8k views

Creating Polyline Buffer in OpenLayers 2?

I was wondering if there was a way to create a buffer around a polyline feature in OpenLayers 2. I have created a tool that allows the user to draw a circle buffer zone of whatever size and style they ...
3
votes
1answer
13k 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, ...
8
votes
1answer
18k views

How to create a polygon (fixed width buffer) around a polygon in QGIS? [duplicate]

I have created a polygon in QGIS (in this case it describes a country's maritime baseline). I need to create a second polygon whose boundary is a fixed distance from the original polygon. (in this ...
8
votes
3answers
6k views

When should I use ST_Buffer?

I would like to know what is the sense of using st_buffer operation. In PostGIS reference guide there is only the syntax and a short description of this operation. Could you give some examples to ...
7
votes
3answers
931 views

Is there a way to have a 'live' buffer in QGIS

I use QGIS (2.10.1) to create buffers around polygons. I often create a series of buffers, and later need to edit the underlying polygons. It is frustrating to start from scratch in re-create ...
4
votes
2answers
980 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
410 views

Using buffer from IDW in ArcGIS 3D Analyst for flood spread?

I have a line in the centre of a road, with the roads elevation attached to its properties. By using Generate Point along lines --> Add Surface Information --> Adding 10 cm to that, and then IDW 3d ...
10
votes
3answers
3k views

Growing a PostGIS geometry by a percentage

I'm looking for a way to add a buffer around a PostGIS geometry, but the size of the buffer should depend on size of the geometry. That is, I want each geometry to be enlargened by, say, 5%. The idea ...
9
votes
3answers
2k views

Creating buffer only in specific direction using ArcGIS for Desktop? [closed]

I am trying to create a buffer for several polygons in a south-western orientation. As far as I know, this is not possible using the buffer tool (I use ArcGIS 10.3). I could do it manually but for ...
7
votes
2answers
1k views

getPart() method returns incorrect geometry from buffer in ArcGIS

I created 4 most basic polygons: And ran this script: import arcpy infc = r'D:\Scratch\POLYGONS.shp' d=arcpy.Describe(infc) SR=d.spatialReference with arcpy.da.SearchCursor(infc, ("SHAPE@","LABEL")) ...
5
votes
2answers
1k views

Compound variables in Model Builder?

I'm trying to create a model wherein one of the parameters is a compound variable, that is made of multiple variables joined together. How can this be done? For example: create an insider buffer ...
4
votes
3answers
1k views

Buffering with physical barrier using ArcGIS Desktop?

I don't think it is possible, but I'm looking for a way to stop my buffer at a certain physical barrier. For example, I have point near a river and I'm creating a buffer around my point that is ...
3
votes
4answers
5k views

ERROR 000800 when trying to snap points layer to line or buffer layer?

I am using ArcCatalog 10.0 and trying to snap a set of points to another layer that has roads in it. The points represent 10th miles along the road. Here are the general steps for what i am doing: ...
3
votes
1answer
115 views

Quartiling a vector buffer in QGIS 3.6

I am evaluating Hurricane data that has a radius which 64kt wind speeds were observed for a specific event. The properties of a Hurricane dictate that the wind speeds change in each part of said ...
3
votes
2answers
603 views

how to extract overlap from non-dissolved buffer zones in qgis 1.7.4

I have a shapefile with the inventory of all limetree in a region. I made a buffer around each tree. So, the place where buffers overlap each other is the best place to put beehives. Is there a way ...
8
votes
1answer
11k views

Geopandas buffer using geodataframe while maintaining the dataframe

The objective is to create a geoDataFrame with buffered geometries AND with all the "attributes" of the original geodataframe. I am able to perform a buffer on my geoDataFrame using: gdfHybasBuffer ...