Re: [OSM-talk-ie] Reduction of size by area of exported OSM or GeoJson image

[Brian Hollinshead]

My thanks first to Rory McCann for doing this for me and to Heikki Vesanto
for also doing it and then showing me how to do it for myself. See below:

Problem: How to shrink the area of a  geojson image by a set percentage.

Solution: Use QGIS (I used v.2.18.13)


Run QGIS
go to PLUGINS, manage and install plugins
Select: Buffer by percentage, install plugin


Drag and drop the geojson file into the layers panel

Activate the Buffer by percentage plugin
Set Buffer area percentage, say 80 and OK


Right click on result line in Layers panel and Save As
In ‘Save vector layer as’ window, insert file name
Select Browse to set destination and Save
Select OK


Job done.


Thank you guys.



On 18 October 2017 at 09:33, Brian Hollinshead 
wrote:

> I am able to take an OSM or GeoJson file of County Carlow boundary and use
> in leaflet or UMap.
> I now would like a file for Carlow which is only 80% the area but the same
> shape to overlay to show the population decrease 1841 to 1851 and having
> the same lat/lon centre.
>
> I have QGIS but am not familiar with it, any suggestions most welcome,
> thank you.
>
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[OSM-talk-ie] Reduction of size by area of exported OSM or GeoJson image

[Brian Hollinshead]

I am able to take an OSM or GeoJson file of County Carlow boundary and use
in leaflet or UMap.
I now would like a file for Carlow which is only 80% the area but the same
shape to overlay to show the population decrease 1841 to 1851 and having
the same lat/lon centre.

I have QGIS but am not familiar with it, any suggestions most welcome,
thank you.
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Talk-ie@openstreetmap.org
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