A region enclosing a point, line, or polygon at a specified distance.
7
votes
3answers
307 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 ...
12
votes
3answers
2k views
How to create 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 ...
5
votes
1answer
1k views
ArcGIS: inside buffer with attributes?
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. There ...
5
votes
1answer
145 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 ...
5
votes
1answer
2k views
What is up with QGIS buffer tool units?
I have been trying to figure this out for a couple weeks now and 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 ...
2
votes
2answers
1k views
Creating a Polyline Buffer in OpenLayers
I was wondering if there was a way to create a buffer around a polyline feature in OpenLayers. I have created a tool that allows the user to draw a circle buffer zone of whatever size and style they ...
7
votes
2answers
689 views
Create “Inner Buffer” in ArcGIS
I am currently searching for a possibility to create an "Inner Buffer" in ArcGIS.
I have a lot of polygons (houses)(in one feature class) and one big polygon (in one other feature class). I want so ...
4
votes
3answers
2k views
Creating a square buffer around a point feature in ArcMap
I would like to create a square buffer from a point feature. I do not understand the code that gos into it. This similar questions as asked on the forums.esri website but that was over 10 years ago. ...
4
votes
3answers
981 views
Conflicting measurement units with buffer ftools
I am new to qgis and I would like to create a buffer around point features.
My goal is to create a quarter mile buffer (402.336m) around each point feature, using Geoprocessing Tools -> Buffer(s), ...
3
votes
3answers
193 views
Buffer with physical barrier
I don't think 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 larger ...
1
vote
2answers
184 views
Buffer point dataset based on compared value
I am creating polygons from the dissolved buffers of points and need to control the dissolve process. In the model the first stage is to assign high/med/blackspot using the following
f2='ERROR'
def ...
9
votes
4answers
463 views
How to buffer 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
2answers
296 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 ...
5
votes
4answers
1k views
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 ...
4
votes
2answers
953 views
Multiple ring buffer with attributes
Building on ArcGIS: inside buffer with attributes?, I'd like to be able to create multiple ring buffers, while retaining (and possibly dissolving on) attribute values. How can this be done?
2
votes
3answers
707 views
ERROR 000800 when trying to snap points layer to line or buffer layer
I am very new to GIS, so go easy on me. 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 ...
1
vote
1answer
140 views
How to fit a polygon to a “best buffer” about a reference geometry in it?
If I have a polygonal geometry gbase, like a street (a rectangular strip), and a reference geometry gref, like a central line of gbase. The question is what is the function (here named BestBuffer) ...
1
vote
1answer
343 views
How to use buffers to estimate the attribute data for a given polygon?
I have two layers: point and a polygon.
The point layer has lat/long and I have created buffers of a 1/4 mile.
The polygon layer has data such as age and income.
Is there a plug-in that can ...
