{"id":258,"date":"2015-05-21T11:24:36","date_gmt":"2015-05-21T11:24:36","guid":{"rendered":"http:\/\/transnationalhistory.net\/mapping\/?page_id=258"},"modified":"2023-08-29T15:13:38","modified_gmt":"2023-08-29T15:13:38","slug":"advanced","status":"publish","type":"page","link":"https:\/\/transnationalhistory.net\/mapping\/tutorials\/performing-queries\/advanced\/","title":{"rendered":"One Step Further: Creating a New Layer out of a Query"},"content":{"rendered":"

Picture you are a specialist of Savoy and you only wish to keep the communes of the two\u00a0d\u00e9partements<\/em> covering the former Duchy. You may consider creating a new layer which will only feature those towns. The file size would certainly be lighter.<\/p>\n

STEP 1: SELECT FEATURES IN THE ATTRIBUTE TABLE<\/strong><\/p>\n

\"6<\/a>Open your attribute table and choose the tool\u00a0Select features using an expression<\/strong>\u00a0You know that the two d\u00e9partements you wish to keep are called\u00a0Savoie<\/em> and\u00a0Haute-Savoie<\/em>. Perform a query as shown below.
\n\"6<\/p>\n

Savoy is highlighted on your map and in your attribute table, but the rest of the layer is still visible.<\/p>\n

\"6<\/a><\/p>\n

STEP 2: SAVE AS<\/strong>
\n\"6
\nNow right click on the layer and choose\u00a0Save as<\/strong>. Keep the selected\u00a0CRS, simply choose a name for your new layer (I called it ‘savoy’) and tick the Save only selected features\u00a0<\/strong>box . Click\u00a0OK<\/strong>.<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

\"6<\/a><\/p>\n

You now have two layers: your original one and your newly created one.<\/p>\n

\"6<\/a><\/p>\n

Untick the original one (or even remove it by right clicking on it and selecting\u00a0Remove<\/strong>). You now have a layer with only the towns\u00a0your previously selected.<\/p>\n

\"6<\/a><\/p>\n

Last update: 2 June\u00a02015 on QGIS 2.8.1 Wien.<\/p>\n

Back to Tutorial 6: Performing Queries<\/a>\u00a0| Next tutorial: Data Visualisation on your Map<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Picture you are a specialist of Savoy and you only wish to keep the communes of the two\u00a0d\u00e9partements covering the former Duchy. You may consider creating a new layer which will only feature those towns. The file size would certainly be lighter. STEP 1: SELECT FEATURES IN THE ATTRIBUTE TABLE Open your attribute table and […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":142,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-258","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/transnationalhistory.net\/mapping\/wp-json\/wp\/v2\/pages\/258","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/transnationalhistory.net\/mapping\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/transnationalhistory.net\/mapping\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/transnationalhistory.net\/mapping\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/transnationalhistory.net\/mapping\/wp-json\/wp\/v2\/comments?post=258"}],"version-history":[{"count":2,"href":"https:\/\/transnationalhistory.net\/mapping\/wp-json\/wp\/v2\/pages\/258\/revisions"}],"predecessor-version":[{"id":381,"href":"https:\/\/transnationalhistory.net\/mapping\/wp-json\/wp\/v2\/pages\/258\/revisions\/381"}],"up":[{"embeddable":true,"href":"https:\/\/transnationalhistory.net\/mapping\/wp-json\/wp\/v2\/pages\/142"}],"wp:attachment":[{"href":"https:\/\/transnationalhistory.net\/mapping\/wp-json\/wp\/v2\/media?parent=258"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}