What coordinate system does UAM-V® version 1.30 operate in?
The UAM-V® has two options for the grid system: either a latitude/longitude grid or a Cartesian grid measured in km. Prior versions required that the Cartesian system be based on UTM coordinates. However, the UAM-V® version 1.30 can use a grid system based on an arbitrary rectangular coordinate system (so long as the distances are measured in kilometers). Coordinate conversions from UTM to latitude/longitude used to be built into the UAM-V® code. In v. 1.30 coordinate conversions have been moved from the model to a preprocessor (the terrain preprocessor). The supplied version of this processor includes the UTM conversion. In order to use an alternate coordinate system, an appropriate conversion routine must be supplied. UAM-V® needs the location of each cell center in latitude and longitude coordinates. This location is used for solar radiation calculations. Therefore, the coordinate conversion routines calculate this location from the Cartesian coordinates of the cells.
