{"id":7023,"date":"2018-11-13T06:10:49","date_gmt":"2018-11-13T05:10:49","guid":{"rendered":"http:\/\/www.sigterritoires.fr\/?p=7023"},"modified":"2023-07-16T13:02:14","modified_gmt":"2023-07-16T11:02:14","slug":"geometry-validation-with-qgis-2-12-0","status":"publish","type":"post","link":"https:\/\/www.sigterritoires.fr\/index.php\/en\/geometry-validation-with-qgis-2-12-0\/","title":{"rendered":"Geometry validation with QGis 2.12.0"},"content":{"rendered":"\n

We have already discussed the geometry validation in a series of\narticles. Particularly, you can read the article The geometry validation tools (5) with QGis<\/a> for the validation tools with\nQGis 2.8<\/p>\n\n\n\n

Version 2.12 brings a new plugin that changes the game. Here is a list\nof those main characteristics . <\/p>\n\n\n\n

Firstly, let\u2019s see what does not change: there is no documentation regarding\nthe tools used by the plugin. It is true that in order to develop those tools implies\na very hard job, but using a tool without knowing what is actually done is not\nvery reassuring . <\/p>\n\n\n\n\n\n\n\n

We are going to proceed as for the aforementioned series of articles, by\ntaking a vector layer with errors and following the behaviour of the plugin. We\nwill be using the same working layer . <\/p>\n\n\n\n

\u00a0\u00bb We will use a layer of Italian communes provided by ISTAT,\nthe Italian Statistical Institute. This is the layer used in the geometry\nvalidation page of Spatialite: SQL functions based on\nliblwgeom support version 4.0.0<\/a> . <\/p>\n\n\n\n

The layer is downloadable in this link: . \u00a0\u00bb <\/p>\n\n\n\n

The QGis version used is 2.12.0 <\/p>\n\n\n\n

Activation of the plugin<\/strong> <\/p>\n\n\n\n

The plugin is installed by default with version 2.12 but not activated .\nYou must activate it : <\/p>\n\n\n\n

Extension -> Install \/<\/em><\/strong> Manage<\/em><\/strong> Extensions<\/em><\/strong>\nthen check the box in front of Check geometry<\/em><\/strong> <\/p>\n\n\n\n

<\/td><\/tr>
\n Software<\/strong> \n <\/td>	\n <\/strong>\n <\/td>	\n Nb<\/strong> errors<\/strong> found<\/strong> \n <\/td><\/tr><\/thead>
\n ArcGis\n 10.3.1 \n <\/td>	\n \n <\/td>	\n 0 \n <\/td><\/tr>
\n SpatiaLite\n \n <\/td>	\n \n <\/td>	\n 19 \n <\/td><\/tr>
\n postgis<\/a>\n \n <\/td>	\n \n <\/td>	\n 19 \n <\/td><\/tr>
\n FME\n 2015 \n <\/td>	\n \n <\/td>	\n 19 \n <\/td><\/tr>
\n Geomedia\n \n <\/td>	\n \n <\/td>	\n 28 \n <\/td><\/tr>
\n Qgis\n 2.8 \n <\/td>	\n Verify\n topol . \n <\/td>	\n 19 \n <\/td><\/tr>
\n \n <\/td>	\n Valid.\n Geom . \n <\/td>	\n 129 \n <\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Viewing\nitems 1 to 7 of 7 items <\/p>\n\n\n\n Previous\nNext <\/p>\n\n\n\n Being 4 times larger than those observed with the geometry validation\ntool available in QGis 2.8 it would be interesting to see what are these new\nerrors detected . <\/p>\n\n\n\n Nevertheless, the only available indication\nis the name of the error : Type of geometry <\/p>\n\n\n\n ( multipolygon ) and the coordinates of the centroid of the polygon\nconcerned . <\/p>\n\n\n\n Despite the efforts deployed, it was impossible to see the errors in\nmost communes indicated as error . <\/p>\n\n\n\n Therefore, we have tried the automatic correction options of the plugin\nbut despite the installation on several positions with different systems and\nconfigurations, we have got a QGis crash with every attempt of correction. <\/p>\n\n\n\n Conclusions<\/strong> <\/p>\n\n\n\n The plugin appears be more effective in the detection of geometry errors\n, but it presents, in its current stage of development two major problems: <\/p>\n\n\n\n \n a lack of accurate location of the error for the\nconcerned geometry concerned <\/li>\n\n\n\n a regular crash of the automatic correction module . <\/li>\n<\/ul>\n\n\n\n To<\/strong> follow<\/strong> with<\/strong> interest, as<\/strong> it<\/strong> looks very<\/strong> promising<\/strong> .<\/strong> <\/p>\n","protected":false},"excerpt":{"rendered":" We have already discussed the geometry validation in a series of articles. Particularly, you can read the article The geometry validation tools (5) with QGis for the validation tools with QGis 2.8 Version 2.12 brings a…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"sfsi_plus_gutenberg_text_before_share":"","sfsi_plus_gutenberg_show_text_before_share":"","sfsi_plus_gutenberg_icon_type":"","sfsi_plus_gutenberg_icon_alignemt":"","sfsi_plus_gutenburg_max_per_row":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1260],"tags":[],"class_list":["post-7023","post","type-post","status-publish","format-standard","hentry","category-non-classe-en"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t