LDT stands for LIS Data Tools. This is the pre-processing package for LIS. From LIS v7.1 it is necessary to pre-process the input parameters through LDT before running LIS.
LDT is not an efficient regridding tool
In LDT configuration file, you can give a series of parameters that will be used by the land surface model in LIS. Each parameter file can be on its own grid and LDT will interpolate the data to the correct grid. However, LDT is not suitable to work with data that is at a lot higher resolution than the target grid. For example, if you want to run LIS on a 100 km resolution grid, if your input file is at 1 km grid, you should not run LDT directly on this file. You are better off using the regridding routines developed at the Centre (email climate_help for information and access) to get the data to a generic 100 km grid. Then you use LDT to transfer the 100 km resolution input to the exact grid you want to run LIS on.
LDT for CABLE
Currently CABLE needs only the following gridded parameters:
- land cover types: IGBP
- soil fraction: FAO
Here is an example of a LDT config file to run with CABLE. Note that we are using AVHRR LAI. LIS comes with an option to run with MODIS LAI, this LAI is directly read in LIS as the data is inter-annual but it has not been tested with CABLE yet.