Questions tagged [buffer]

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

http://support.esri.com/en/knowledgebase/GISDictionary/term/buffer

The "buffer" tag does not refer to the sense used in computer science, where it refers to forms of transient storage used to improve communications among devices or parts of an algorithm.

1482 questions

votes

3 answers

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 can supply two related geometries — g1 and g2…

buffer

asked Sep 12 '12 at 10:01

Peter Krauss

2,292
23
43

votes

1 answer

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 center (coconut) is not at the ST_Centroid point,…

buffer

asked Sep 25 '12 at 13:12

Peter Krauss

2,292
23
43

votes

1 answer

Using Buffer tool?

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 location spaced 812 meters from any given end point…

buffer

asked Jan 15 '14 at 13:12

user25819

votes

2 answers

Calculating boundary around all land on Earth?

I hope this is right here in Earth Science, it's a bit of a Computer Science-y problem, too: I want draw (or really just calculate the total area) of a boundary of X miles (with X varying between around 200-400) around all of Earth's landmass. It…

buffer

asked Jul 21 '18 at 16:18

user160531

votes

1 answer

Need to make a buffer around a part of a feature, keeping other features attached

Basic problem: I have two layers, a layer containing river basin outlines and a layer of wetland outlines and types. I need to make a buffer around one river basin, and then create 100 random points within a single type of wetlnad within the river…

buffer

asked Apr 25 '13 at 21:06

user17575

votes

1 answer

Drawing concentric circles with different radii in QGIS

I have table that contain point data and multiple distance value for the point data in three different direction. I would like draw arc of 65degree in each of these three directions where the radius of the arc will vary according to a given distance…

buffer

asked Sep 18 '19 at 21:12

syed

votes

1 answer

Point buffer problem

I have a point feature that I would like to buffer to select segments that are within 15 meters of the point. The code I have is working but it's influenced by the map scale. Zooming in or out changes the buffer size. This is what I am…

buffer

asked Apr 21 '15 at 03:20

Terry

vote

0 answers

Drawing buffers around polygons until threshold is reached

I am trying to draw multiple buffer rings around polygons in QGIS, but have an additional layer of complexity that is confusing me. I want to draw buffer rings (well not really rings since they are all sorts of polygon shapes) around polygons from a…

buffer

asked Aug 09 '21 at 18:06

LostinSpatialAnalysis

vote

0 answers

Multibuffer and difference Qgis python

My friend and I, we are developing a plugin for qgis but we have a drawback when doing the multibuffer we do not understand the methods well and the code we are using is the following #Generación de los buffer sobre la capa vías # Se leen…

buffer

asked Oct 12 '17 at 18:42

Lina Viasús

vote

1 answer

How do I assign point value ranking system to multi-ring buffers?

I created a multi-ring buffer of different distances, and I want to assign a point ranking to each distance as part of my analysis. So for example: farms within the 0-25 mile buffer would get 4 points, farms within the 25-50 mile would get 3 points,…

buffer

asked Jun 07 '15 at 02:31

Julia

votes

0 answers

QGIS - Determine percentage of coverage of buffer for census tracts

I have a census tract shapefile for the state of South Dakota. I have providers plotted with a 40 mile radius buffer. I am trying to determine what percent of each census tract is covered by any part of the buffer. How can I do this?

buffer

asked Dec 09 '20 at 00:27