An OMS parameter file contains information on both spatial and non-spatial parameters. Spatial parameters are generated in GIS using geographic boundaries (hrus, AOIs, etc) as the enumeration unit. Non-spatial parameters are tabular data that are used in the estimation of spatial parameters or other data that are not used in GIS analysis. Non-spatial parameters are usually stored in default parameter template files or specified during runtime by the users. A copy of the OMS parameter file is attached.
BAGIS-P stores the calculated spatial parameters in a File Geodatabase table that can be joined to the HRU geometry (i.e., a vector featureclass) for visualization. BAGIS-P also provides the function to export the parameters to ASCII files that are based on the OMS paramater file format. See the attached file for an example of the parameter file. During the export process, BAGIS-P merges the spatial parameter data stored in the FGDB and the non-spatial parameter data stored in a template parameter file to create the final parameter ASCII file.
The OMS parameter files use tags (@) to describe the data. Scalar values in the table begin with @P. Parameters that are single dimensioned are given in a table that begins with @T followed by the dimension name they are associated with. Following the @T is the length, len, of the dimension size. This is followed by a header @H which contains the name of the parameter in each column. For 2-D parameters, the table identifier @T is followed by the parameter name and the next line shows the bounds of each dimension of the parameter. The order is row, column. strain_adj, rain_adj, and snow_adj are parameters that are dimensioned by nmonths and nhru. The header @H lists the hru ids.