<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>Hi,</div><div>Yes indeed, i has thinking at the object level. I have a method to remove thousands of rings that I developed for merging LiDAR borders files that generally results in thousands of polygones with thousands of islands.</div><div><br></div><div>If you want to eliminate thousands of rings, or holes inside polygons , you need create new polygon layer with a big square covering the entire area. Then, you can subtract the polygone layer from the square. You will be left with all the rings and the square contour. After deleting the square contour (a single polygon), all you have left is the inside rings. Using the merge tools, you can then merge the inside rings with polygons. </div><div><br></div><div>The result is a polygon layer with no more rings. You may have to do a spatial query to transfert the data base to the new polygons. That depends on the algorithm used. Write back if this is not clear.</div><div><br></div><div>Nicolas</div><div><br>Le 14 sept. 2018 à 10:24, Michael Treglia <<a href="mailto:mtreglia@gmail.com">mtreglia@gmail.com</a>> a écrit :<br><br></div><blockquote type="cite"><div><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><div dir="ltr"><div>Hi Delaz, Nicholas,</div><div><br></div><div>Thanks so much for the responses!</div><div><br></div><div>Delaz - your solution works - not sure if it's quicker/simpler to click on the rings using the 'delete ring' tool, but it's a smart alternative option.<br></div><div><br></div><div>Nicholas - I think the challenge is that you can select the objects, but I couldn't figure out a way to select rings for a bulk deletion, as it's more about removing the holes (and selecting the bounding vertices) than selecting the objects themselves. I'm happy to learn if I was just missing something.</div><div><br></div><div>On a related note - for the Shape Digitizing toolbar, those tools only work to create new polygons, not new parts of a multipolygon, correct? Or is there a way to do that I've been missing? (I know you can merge tool in this case as well, but figured I'd check).</div><div><br></div><div>Thanks!</div><div>Mike<br></div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Sep 12, 2018 at 12:12 PM Nicolas Cadieux <<a href="mailto:nicolas.cadieux@archeotec.ca">nicolas.cadieux@archeotec.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Hi,<br>
</p>
<p>You have various selection tools in the GUI. (yellow box Icon
with an arrow). If you use shift + left mouse click, you can add
to the current selection. I think it is Ctlt + left mouse click
in some version of QGIS.<br>
</p>
<p>Nicolas<br>
</p>
<br>
<div class="m_-7699604176463506376moz-cite-prefix">On 2018-09-12 11:12 AM, Michael Treglia
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Hi All,</div>
<div><br>
</div>
<div>I'm doing some work that entails fixing up some
digitization based on per-pixel image classification.
Sometimes there are polygons with lots of rings contained, so
I'm using the Delete Ring tool, but that requires clicking on
every individual ring. Is there a way to delete multiple rings
at one time via clicking/dragging with a keyboard key held or
anything like that? <br>
</div>
<div>Thanks!</div>
<div>Mike<br>
</div>
<div><br>
</div>
</div>
<br>
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