Urban growth and change, places a heavy demand on local governments to seek better planning and management approaches. Increasing urbanization puts pressure on natural resources and existing infrastructure. Elected officials in these local governments require timely information products to support policy decisions on issues that are often interrelated and can span several political boundaries. As a result, local governments have invested considerable resources in developing Geographic Information Systems (GIS) to aid them in their planning and decision making processes. A digital image Base Map is a key information layer in many local government GIS systems.

Traditionally only image base maps and derivative products were used by city planners and engineers for tax assessment, inventory, construction planning of roads/bridges, utility planning, storm water management, and other civil planning activities. A major hurdle to the effective application of remote sensing imagery for these applications was the positional accuracy of the image base maps and derivative products. Existing vector data layers road centerlines, parcel and zoning boundaries, etc. were routinely superimposed upon the image-based products for planning and assessment applications. Usually the vector data layers

would not line up with the image products, and the products were perceived to be of limited value and were not integrated into standard operations and decision-making processes within the local government. Thus, due to the limitations of the horizontal accuracy of a remote sensing product, its utility for application in local government GIS systems as an accurate base map was very limited.

As a solution to this problem in the industry, "Prashant Surveys" can prepare accurate base maps for Property & City Surveys of various sizes using the combined technology of 3D Mobile LiDAR & UAV (unmanned aerial vehicle) /drone survey or 3D Mobile LiDAR & High Resolution Satellite Images, depending upon the accuracy requirements of the project. The technology of Mobile LiDAR and UAV will generate the base map with the accuracy upto +/- 5 cms which is sufficient for mapping on 1:500 scale. Whereas the technology of Mobile LiDAR and high resolution satellite images will generate the base map with the accuracy upto +/- 20 cms which is more cost effective and can be used by small municipal councils for preparing base maps on 1:1,000 scale.