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Frequently Asked Questions

Q. Why should I register?

A. Registration allows users to (i) access LIS data and (ii) download the LIS source codes. This data can be accessed using a standard web browser to download raw datasets in either binary or grib format. Registered users can also use the Live Access Server, which allows users to dynamically generate images and data files. By supplying your e-mail address, users will be notified when new data is available, and also if there are any bugs that have been reported.

Q. What are the input datasets used in LIS?

A. LIS runs are driven by atmospheric forcing data. LIS uses two atmospheric data assimilation model outputs as the base forcing: NCEP GDAS (Global Data Assimilation System), and NASA GEOS DAS (Goddard Earth Observing System Data Assimilation System). The model forcing data are then superposed by optional observed datasets, such as radiation and precipitation. The LIS forcing data documentation page gives more details on the forcing datasets.

LIS also uses land surface parameter data. Land surface models simulate the physical and dynamical process of the land surface. Driven by external forcing, the spatial and temporal evolution of these processes are intrinsically determined by these parameters of the land surface. There are a common set of land surface parameters that are being used by most land surface models. The LIS parameter data documentation page gives more details on the land surface parameter datasets.

Q. What is the format of LIS output, and how is it delivered to users?

A. Currently, LIS output is in binary format. Eventually, the output will be delivered in GRIB format.

For users wishing to view LIS output data, the Gallery shows plots categorized by model, forcing data, and resolution. Plots are listed by its ALMA variable name.

To visualize LIS data, we have developed a web-based visualization system called "Land Explorer" (LE). LE tightly integrates with the LIS Grads-DODS server. It is designed to let users interactively visualize and explore LIS data at all resolutions, featuring an intuitive web interface and fast response. No special requirements, such as javascript, cookies, java applets, or pop-up windows are needed.

Q. What type of platform support is needed for LIS?

A. LIS has been tested on a custom Linux cluster and a SGI Origin.

Q. Are LIS resources available to the general public?

A. Registered users can (i) access LIS data and (ii) download the LIS source codes.