What if my home or building was built or significantly changed after 2009?
The City of Falls Church GIS Analyst consulted all post-2009 grading plans to determine the correct impervious coverage area. The GIS Analyst received the 2013 aerial imagery in April and will verify or correct the existing impervious surface data against the new imagery.

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1. How was the aerial imagery collected?
2. What is orthophotography?
3. How was the impervious data collected?
4. What if my home or building was built or significantly changed after 2009?
5. Why does the impervious layer not exactly match up with the imagery layer?