The creation of the contour data was executed to capture the existing ground conditions at a specific point in time for the purpose of GIS mapping and analysis. Contour information is used for plannimetric mapping and for creating TINs and RASTERs, which support 3D mapping and ground/slope visualization. TINs and RASTERs of elevation data support spatial analyses related to slopes, viewsheds, water runoff, and other map algebra-based applications.Although the contract with VGIN (VA Geographic Information Network) was initiated in 2006, due to the late signing of the contact between the State and their contractor, there was not a long-enough "leaf-off" period to complete state-wide orthophotograhy mapping; the City of Richmond was one of many localities postponed until the Winter of 2007.

The creation of the contour data was executed to capture the existing ground conditions at a specific point in time for the purpose of GIS mapping and analysis. Contour information is used for plannimetric mapping and for creating TINs and RASTERs, which support 3D mapping and ground/slope visualization. TINs and RASTERs of elevation data support spatial analyses related to slopes, viewsheds, water runoff, and other map algebra-based applications.Although the contract with VGIN (VA Geographic Information Network) was initiated in 2006, due to the late signing of the contact between the State and their contractor, there was not a long-enough "leaf-off" period to complete state-wide orthophotograhy mapping; the City of Richmond was one of many localities postponed until the Winter of 2007.