A model and a set of tools were previously developed in a separate study. That model is to delineate
farmlands into sub-fields based on topography to better simidate hydrological patterns with the assistance
from APEX (Agricultural Policy Environmental Extender) model for further processing. That model requires
a lot o f manual operations between and within steps, which introduces unnecessary human errors. A GIS
database and graphic user interface (GUI) was developed in this study to streamline that model and tools.
Because the farmland and delineated sub-fields may contain different attributes, a two-level hierarchical
database was proposed. The top level database is used for storing farmlands, with one feature class for each
farmer (a farmer may have multiple farmlands). The second level database is used for storing delineated subfields,
with one feature class for each piece of farmland from which the delineated sub-fields are derived. The
GUI provides menus and buttons for user to run the model.