== Masked data output ==
=== General ===
From release 3.7a (r483) output of masked data is implemented in PALM. This feature allows to output quantities at different mask locations and can already use netCDF4 file format.\\
Default quantities are available and can be declared with the parameter [../d3par#data_output_masks data_output_masks], user-defined quantities can be output with [../userpar#data_output_masks_user data_output_masks_user].\\\\  
Different [../d3par runtime parameters] defines the masks and steers the output:
   [../d3par#dt_domask dt_domask]\\
   [../d3par#mask_scale_x mask_scale_x]\\
   [../d3par#mask_scale_y mask_scale_y]\\
   [../d3par#mask_scale_z mask_scale_z]\\
   [../d3par#mask_x mask_x]\\
   [../d3par#mask_y mask_y]\\
   [../d3par#mask_z mask_z]\\
   [../d3par#mask_x_loop mask_x_loop]\\
   [../d3par#mask_y_loop mask_y_loop]\\
   [../d3par#mask_z_loop mask_z_loop]\\
   [../d3par#skip_time_domask skip_time_domask]
So far 20 different masks can be defined. Each mask is output to one local file.\\
Instantaneous data of '''mask 1''' is output to file [../iofiles#DATA_MASK_01_NETCDF DATA_MASK_01_NETCDF], time-averaged data to file [../iofiles#DATA_MASK_01_AV_NETCDF DATA_MASK_01_AV_NETCDF].
Instantaneous data of '''mask 2''' is output to file [../iofiles#DATA_MASK_02_NETCDF DATA_MASK_02_NETCDF], time-averaged data to file [../iofiles#DATA_MASK_02_AV_NETCDF DATA_MASK_02_AV_NETCDF].
Instantaneous data of '''mask 3''' is output to file [../iofiles#DATA_MASK_02_NETCDF DATA_MASK_03_NETCDF], time-averaged data to file [../iofiles#DATA_MASK_02_AV_NETCDF DATA_MASK_03_AV_NETCDF].


=== Examples ===