FM Tute M02 ARC Define Elevations: Difference between revisions
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<li>Open the layer 2d_ztin_ FMT_M02_development_001 within ArcGIS and observe the polygon and its attributes. This polygon 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 layer '2d_ztin_ FMT_M02_development_001_P within ArcGIS and observe the points and its attributes. These points all 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 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>
[[File:M07 TIN ARC.png|800px]]
<li> Save and close the layers.</li></ol>
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