Andrea, Thank you for the clarification and the work around! Regards, Richard
—— Richard McDonnell MSc GIS, FME Certified Professional FRM Data Management —— Oifig na nOibreacha Poiblí Office of Public Works Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36 Jonathan Swift Street, Trim, Co Meath, C15 NX36 —— M +353 87 688 5964 T +353 46 942 2409 https://gov.ie/opw —— To send me files larger than 30MB, please use the link below https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie Email Disclaimer: https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/ —— MSc GIS, FME Certified Professional —— Oifig na nOibreacha Poiblí Office of Public Works Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36 Jonathan Swift Street, Trim, Co Meath, C15 NX36 —— M +353 87 688 5964 T +353 46 942 2409 https://https://gov.ie/opw<https://www.opw.ie> —— Email Disclaimer: https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/<https://www.opw.ie/en/disclaimer/> From: Qgis-user <qgis-user-boun...@lists.osgeo.org> On Behalf Of Andrea Giudiceandrea via Qgis-user Sent: 29 November 2022 16:14 To: qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] Problem Noticed with QGIS Richard McDonnell richard.mcdonnell at opw.ie<mailto:qgis-user%40lists.osgeo.org?Subject=Re%3A%20%5BQgis-user%5D%20Problem%20Noticed%20with%20QGIS&In-Reply-To=%3C9708d6dac99943929281a173e54a9e6f%40opw.ie%3E> Tue Nov 29 07:17:48 PST 2022 ________________________________ 1. If I use the option [Create temporary Layer] it produces a Singlepart Geometry as Expected, If I save the output to a File, the resultant geometry is stated as Polygon (MultiPolygon) Its the same for Linestrings also. Hi Richard, as explained (also by me) in the linked issue report [1], the line (PolyLine) and polygon (Polygon) ESRI Shapefile layer types are actually multi-part layer types which can store both multi-part geometries with only one part and multi-part geometries with more than one part. Only the point layer type has two different ESRI Shapefile layer types: the ESRI Shapefile Point type (which is a single-part type and can store only single-part geometries) and the ESRI Shapefile MultiPoint type (which is a multi-part type and can store multi-part geometries both with only one part and with more than one part). Please see the ESRI Shapefile Technical Description [2]. If you want to check that a line (PolyLine) and polygon (Polygon) ESRI Shapefile layer imported in QGIS contains features with only 1 part, you need to check the number of part for each feature, for example using the num_geometries function [3] in the field calculator. Best regards. Andrea Giudiceandrea [1] https://github.com/qgis/QGIS/issues/50720 [2] https://www.esri.com/Library/Whitepapers/Pdfs/Shapefile.pdf/ [3] https://docs.qgis.org/3.22/en/docs/user_manual/expressions/functions_list.html#num-geometries
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