[Qgis-user] combining fragmented forests (RMG)

[Michael Harte]

Reiko,

You could try something like this:

 1. Merge all forests into a single file (if you haven't already);
 2. Create a new field in the forests table called something like "border"
 3. Create lines that trace the panel boundaries, that separate the
    forests you want to join;
 4. Buffer each of those lines by some small distance  (try 1 meter);
 5. For each buffer "Select by location" all features in forests that
    intersect buffer;
 6. Use the field calculator in the table to enter a unique identifier
    for the selected features in the "border" field;
 7. Do this for each buffer;
 8. Dissolve the forest layer on the border field.

Feel free to get in touch.

Cheers,

Mike




Message: 1
Date: Wed, 6 May 2020 14:55:30 -0400
From: RMG<reikogoodwin at gmail.com>
To:qgis-user at lists.osgeo.org
Subject: [Qgis-user] combining fragmented forests
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	<CALwVOrJq9njBAdtvVeXLVsVT8SEjcDfp5mp=AYdoOi93w3TWxA at mail.gmail.com>
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Hello,

I have five shapefiles that contain thousands of fragmented forests that I
created from a NDVI raster of a large protected area in West Africa, which
I separated into five panels. Now, how do I stitch thousands of the
fragmented forests at the borders?

Each shapefile's attributes have ID, count (number of units), area, and
perimeter, so I can visually recognize which fragments need stitching, but
because there are so many, I don't think I can do it manually.

Any help would be appreciated.

Best wishes,


Reiko Matsuda Goodwin
Comoé Monkey Project<https://www.facebook.com/ComoeMonkeyProject/>
Guenon Conservation Community
<http://facebook.com/GuenonConservationCommunity/>
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