FM Tutorial M02 QGIS GPKG Define Elevations: Difference between revisions

<li>Close the two layers in QGISthe Layers Panel and then reload them from the project GeoPackage file '''M02_5m_002.gpkg'''.

<li>Open the attribute table for the layerThe '''2d_ztin_ FMT_M02_development_001_R''' withinlayer QGIS.consists Thisof a polygon which defines the area within which we wish to alter the zpt elevations. Any points falling within the polygon are used for creating the TIN surface. The attributes of this polygon have been left blank (are set to 0) as the elevations will be defined in a separate layer.

<li>Open the attribute table for the layer '''2d_ztin_ FMT_M02_development_001_P'''. TheseAll pointsof allthe points have elevations assigned to the ‘Z’ attribute and will be used when generating the TIN. Note that none of the points are snapped to the polygon within the '''2d_ztin_ FMT_M02_development_001_R''' layer. The elevations of the polygon’s perimeter will therefore be based on the current zpt values (i.e. the zpt values assigned by any prior commands). Later on in this tutorial, we will specify the command used within the tgc to associate the two GIS layers with each other.<br>