====== Reference View ======

This page explains the Reference View of the [[227:products:3dm_viewer]] and how to use it.\\

The Reference View is a 2D view on which a 2D basemap from the user's choice can be overlaid with 2D vector resources and footprints and field of views of 3D resources. 

{{:227:viewer:viewmodes:referenceview.png?nolink&1000|}}

=== The reference basemap ===

Via the [[227:viewer:menu:basemap_selection|Basemap Selection Menu]] it is possible to change the 2D basemap of the Reference View.

=== Display of footprints and field of views ===

How the footprints and field of views are displayed on the Reference View depends on the data type of the available resources.

**Mobile Mapping and Planar Photo Positions**\\

  * Blue dots: Represent the photo positions or recording locations. These are visible up to a map scale of 1/1500. \\
  * Blue pie-slices: Heading and field of view of a Mobile Mapping View. The number on the pie-slice corresponds to the number of the view.

Photo positions can be turned on/off from the [[227:viewer:sidebars:resources|Resources Sidebar]] \\
Check the page "[[227:viewer_flash:panorama:navigate|]]" for an overview of the navigate and open view functions.

**Oblique Footprints**\\

  * Blue quadrangle: the border of the footprint of the active photo.
  * Green cross: Center of Oblique View.
  * Red cross: Location of the cursor on Oblique View.

Footprints can be turned on/off from the Resources sidebar. \\

=== Vector overlays ===

Vector layers are by default not displayed in the Reference View. This can be changed in the [[227:viewer:menu:settings|Settings menu]].

How vector overlays are displayed is dependent of the legend of the vector layer. This can be set in the Resources sidebar. 
Note that a vector dataset may not be visible due to scale limit limitations.