VDV Virtual Disaster Viewer


The Public area of the website

  1. Navigate to the Virtual Disaster Viewer (VDV) homepage at http://www.virtualdisasterviewer.com. Major browsers (i.e. Internet Explorer 7 and Firefox) are supported.

  2. The VDV homepage contains a main map window, which utilizes Microsoft's Virtual Earth™ aerial imagery and road base layers. Toggle between the "road" and "aerial" views using the Virtual Earth controls. Also use these controls to zoom in/out and pan around, or turn your mouse wheel (away = zoom in; toward = zoom out). You can double click on an area to centre the zoom on that region. To pan around the image, hold down the left mouse button and drag the image within the map window.

  3. On this public area of the website, with the default Virtual Earth data, you can zoom-in to 0.7 miles. This is low resolution pre-disaster imagery. As you zoom closer, you will register a blank screen. Once you check the VDV "event imagery" box, you will be able to see far more detail within high-resolution Quickbird satellite imagery.

  4. On the right hand side of the VDV interface are imagery and data overlay options:
    • Event imagery - Pre-disaster (26/6/05) and post-disaster (3/6/08) high-resolution satellite imagery. Check the box to display the image on top of the base layers.
    • Once one of the event imagery buttons is checked, the satellite imagery will load into the viewer (this may take some time to fetch and refresh, so please be patient). Note: For licensing reasons, the disaster imagery served in this part of the VDV site can't be zoomed higher than the 80 yard scale. You will be able to view full-resolution data if you conduct an expert interpretation.
    • Experiment with the opacity modifiers to see changes caused by the earthquake. With the pre-event and post-event boxes checked, start with the pre-event opacity slider at 100%, and the post-event slider at 0%. All you can see is the "before" image. Move the post-event slider to 50%. Now you can see a combination of both images. Lastly, move the slider to 100% and all you can see is the "after" image. During your expert analysis, by interactively moving the slider, you will be able to determine the degree of change caused by the earthquake.
    • Analysis results - Completed results from expert interpretations of building and bridge damage, landslide activity and humanitarian response. Check the box to display this data on top of the imagery. Map legends for each layer are displayed below the map window.
    • Field data - Ground-based GPS-referenced photographs, video and comments collected by EERI and EEFIT field teams. Once you check these boxes and click on one of the red markers that will appear in the main map window, a photograph viewing window will appear.

To register for an expert interpretation, contact vdv_admin@imagecatinc.com. Once you receive your login ID, password and guidelines, navigate to the login link at the top right hand corner of the webpage.