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How to build 3D GIS and Geospatial Data from Level of Detail 0 (polygon) to Level of Detail 1 (extrude model and multipatch) using ortho imagery and digital elevation raster obtained from UAV / Drone Photogrammetric Processing.  

How to extract building footprints polygon from point clouds data generated from LIDAR or Photogrammetric UAV Survey. If you have LIDAR points clouds, the perfect and precise result is guaranteed. If you are using Point clouds data generated from photogrammetric processing of aerial or UAV Survey, make sure you perform precise point clouds classification first, or else some misclassified and wrongly extracted building footprints are expected. 

Measure building height is not something easy to do in the field. You going to needs field equipment that is not always easy to carry around. On another occasion may be you needs Digital elevation surface data to helps you correctly measure building height. Even you going to needs finer resolution DSM that so expensive and hard to find. Is there any other way if you want to know building height in very easy way.  Lucky for you, ArcGIS Desktop has been implemented a measurement tool that is not only works in 2D space, but also in 3D space. The tool is called Mensuration Tool. It can measure point, line or polygon in 3D, so you will get Z-dimension information like height or elevation from a source data. Currently it could measure building height from high resolution satellite imagery in an intuitive way. By intuitive I means its precision of measurement will highly depends on how you do the measurement. You can directly measure house or building height using its shadow as reference,...