ash_struct_manager.pro:
The main driving IDL program to format the data correctly for the WMO-SCOPE-Nowcasting. This program will do some
error-checking to see if you have provided the required variables and attributes for this intercomparison.

To read a more verbose description, run this program with the 'help' keyword:
IDL> status = ash_struct_manager(/help)

To see an example of how the attribute structure should be formatted, run this program with the 'attr_example' keyword:
IDL> status = ash_struct_manager(/attr_example)


get_tags.pro: ancillary program in ash_struct_manager.pro


polar_netcdf_concatenate.pro: 
Merges together several individual granules of MODIS or VIIRS data (extracted from netCDF
files), in order to join data from the same MODIS/VIIRS orbit. The data in each netCDF granule should have the same
variable and attribute structure (including the same dimensions for the variables). These data need to have at
least the required variables and attributes. See the help for 'ash_struct_manager.pro' to see what is required, or
the "Meeting on the Intercomparison of Satellite-based Volcanic Ash Retrieval Algoriths within WMO
SCOPE-Nowcasting: Work Plan", available at:  http://cimss.ssec.wisc.edu/meetings/vol_ash15/wmo_satellite_ash_retv_intercomparison_plan.pdf'


netcdf_reader.pro:
An ancillary program in polar_netcdf_concatenate.pro


struct_replace_field.pro:
An ancillary program in polar_netcdf_concatenate.pro


netcdf_sds_writer.pro:
An ancillary program in ash_struct_manager.pro and polar_netcdf_concatenate.pro. This program will write data in
netCDF4 format by default.It is recommended that users begin with 'ash_struct_manager.pro' to write netCDFs in
the required format, rather than 'netcdf_sds_writer.pro', alone.