[Qgis-user] Intersect vs extractbylocation

[Dennis Burgess]

When I tried both methods, the interests takes about 20x times longer than the extract.  The number of rows output are the same.  So my assumption is that they would be the exact same just one faster.  Was just making sure that I did not miss something in it..


[LTI-Full_175px]
Dennis Burgess, Mikrotik Certified Trainer
MTCNA, MTCRE, MTCWE, MTCTCE, MTCINE, MTCSE, HE IPv6 Sage, Cambium ePMP Certified
Author of "Learn RouterOS- Second Edition”
Link Technologies, Inc -- Mikrotik & WISP Support Services
Office: 314-735-0270  Website: http://www.linktechs.net<http://www.linktechs.net/>
Need to Automate MikroTik Backups:  https://cloud.linktechs.net
Create Wireless Coverage’s with www.towercoverage.com

From: Alexandre Neto <senhor.neto at gmail.com>
Sent: Wednesday, September 14, 2022 10:47 AM
To: Dennis Burgess <dmburgess at linktechs.net>
Cc: QGIS User <qgis-user at lists.osgeo.org>
Subject: Re: [Qgis-user] Intersect vs extractbylocation

Hi Dennis,

The intersects will try to combine the geometries of the two input layers. In your case, it will always return a point anyway. Also, it will add both input layer's attributes in the output file.
The Extract by location will just check which points are within the polygons and present it as an output, hence much faster.

Alexandre Neto

Dennis Burgess via Qgis-user <qgis-user at lists.osgeo.org<mailto:qgis-user at lists.osgeo.org>> escreveu no dia quarta, 14/09/2022 à(s) 16:20:
I have a shape file and a list of points..

Trying to understand what the difference is between intersect vs exteactbylocation .

Extract by location takes NO TIME, under a min on all of my runs, but intersection takes quite a bit of time..  In the end, all I want is what lines in the CSV (packaged as GPKG) are within or are contained within the Shapefile.


[LTI-Full_175px]
Dennis Burgess, Mikrotik Certified Trainer
MTCNA, MTCRE, MTCWE, MTCTCE, MTCINE, MTCSE, HE IPv6 Sage, Cambium ePMP Certified
Author of "Learn RouterOS- Second Edition”
Link Technologies, Inc -- Mikrotik & WISP Support Services
Office: 314-735-0270  Website: http://www.linktechs.net<http://www.linktechs.net/>
Need to Automate MikroTik Backups:  https://cloud.linktechs.net
Create Wireless Coverage’s with www.towercoverage.com<http://www.towercoverage.com>

_______________________________________________
Qgis-user mailing list
Qgis-user at lists.osgeo.org<mailto:Qgis-user at lists.osgeo.org>
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20220914/71522690/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 4424 bytes
Desc: image001.png
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20220914/71522690/attachment-0001.png>