Creates a buffer zone around or inside a polygon or polygons
3K download
Aggiornato 23 set 2021

bufferm2.m Documentation

Author: Kelly Kearney View bufferm2 on File Exchange

This function is mostly a legacy one. In early versions of the Mapping Toolbox (circa 2005 or so), the bufferm.m function included some buggy behavior, causing it to be very slow and occasionally fail completely. I wrote this function as a replacement.

The bugs were corrected in R2006b, but I kept this version around because it handled polygon holes more robustly than the original: bufferm simply filled them in, while bufferm2 trims or pads holes according to the buffer width.

Somewhere between R2006b and R2013a, the behavior of bufferm.m was updated to handle holes in the same way as my version. So now, really the only difference between the two is that mine can be applied in cartesian coordinates.


[latb,lonb] = bufferm2(lat,lon,dist,direction)
[latb,lonb] = bufferm2(lat,lon,dist,direction,npts)
[latb,lonb] = bufferm2(lat,lon,dist,direction,npts,outputformat)
[xb,  yb]   = bufferm2('xy',x,y,dist,direction,npts,outputformat)

See function help for description of input and output variables.


We'll use the Great Lakes polygons as our starting point.

load conus;

geoshow(uslat, uslon, 'color', 'k');
geoshow(statelat, statelon, 'color', 'k');
geoshow(gtlakelat, gtlakelon,...
    'DisplayType', 'polygon', 'FaceColor', 'blue')


Calculate a 1-deg outward buffer. We use a reduced-point version of the polygon as our input, since most of the little features will be smoothed out by the buffering process anyway. The result of this calculation is the same as from the bufferm function.

tol = 0.1; 
[reducedlat, reducedlon] = reducem(gtlakelat, gtlakelon, tol);

dist = 1;
[latb, lonb] = bufferm2(reducedlat, reducedlon, dist, 'out');

geoshow(latb, lonb, 'DisplayType', 'polygon', 'FaceColor', 'yellow');
geoshow(gtlakelat, gtlakelon, 'color', 'b', 'linestyle', ':');


Cita come

Kelly Kearney (2024). bufferm2 (https://github.com/kakearney/bufferm2-pkg), GitHub. Recuperato .

Compatibilità della release di MATLAB
Creato con R2007a
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Le versioni che utilizzano il ramo predefinito di GitHub non possono essere scaricate

Versione Pubblicato Note della release

linked GitHub readme

Linked to GitHub repository

Fixed a bug in input checks so input can be either row or column vectors. Also updates internal plot checks to plot in cartesian coordinates so can be used to check both geographic and x-y input.

Added ability to work in cartesian coordinates rather than geographic space; updated description and example on webpage.

Added link and comments to this web page regarding the updated version of bufferm.

Per visualizzare o segnalare problemi su questo componente aggiuntivo di GitHub, visita GitHub Repository.
Per visualizzare o segnalare problemi su questo componente aggiuntivo di GitHub, visita GitHub Repository.