LDT Documentation

Documentation and additional information to support the use of LDT are provided at the links below.

The official technical description paper:

Arsenault, K.R., S.V. Kumar, J.V. Geiger, S. Wang, E. Kemp, D.M. Mocko, H.K. Beaudoing, A. Getirana, M. Navari, B. Li, J. Jacob, J. Wegiel, and C.D. Peters-Lidard, 2018: The Land surface Data Toolkit (LDT v7.2) – a data fusion environment for land data assimilation systems. Geosci. Model Dev., 11, 3605-3621, doi:10.5194/gmd-11-3605-2018

Online HTML-based documentation reflecting the master branch of NASA-LIS/LISF is available on our LISF documentation GitHub page.

PDF-based documentation specific to each release is available under our Releases page.

Additional documentation:


A few helpful LDT terms to be familiar with:

"Native" files: Where the user is able to read in parameter files in sort of their "native" state from their original data source, like NCEP or NCAR.

LIS-team processed files: Where the user reads in parameter files, originally processed by the LIS team, that are in a specific binary-format (*.1gd4r = direct-access, big-endian 4-byte reals) and have the "UMD" landmask imposed. These files are commonly referred to as "LIS-data".

The "Fill" options: Where the user can select options to "fill" in a missing or "water-based" parameter value where a valid mask point indicates "land" is present. Options include how many neighboring values to search (the "radius") and a set default value if no neighboring values are found. The "fill" step occurs after an input parameter field has been spatially transformed to the LIS output grid.