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Title: Demeter


Demeter is a fully extensible, community-based land use land cover (LULC) downscaling and change detection model that allows for customization and/or additions from its user base.

Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
OSTI Identifier:
Report Number(s):
Demeter; 005370MLTPL00
Battelle IPID 31184-E
DOE Contract Number:
Resource Type:
Software Revision:
Software Package Number:
Software CPU:
Open Source:
Available at
Source Code Available:
Other Software Info:
Available as open source on PNNL store.
Related Software:
Often used with the Global Change Assessment Model (GCAM) but not required.
Country of Publication:
United States

Citation Formats

. Demeter. Computer software. Vers. 00. USDOE. 21 Jul. 2017. Web.
. (2017, July 21). Demeter (Version 00) [Computer software].
. Demeter. Computer software. Version 00. July 21, 2017.
title = {Demeter, Version 00},
author = {},
abstractNote = {Demeter is a fully extensible, community-based land use land cover (LULC) downscaling and change detection model that allows for customization and/or additions from its user base.},
url = {},
doi = {},
year = 2017,
month = 7,
note =

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  • The Demeter project tries to provide a framework for digital design and to define an integrated environment which will support the whole range of design activities. This report describes D0, the preliminary phase of the Demeter project. D0 is an experiment in communication among existing tools in a specific design domain (reliability analysis). The selected tools execute on different computer systems and use widely different data representations. D0 provides a unifying framework which allows isolated tools to cooperate in a useful way and makes the underlying structure invisible to the user. 10 references.
  • In Greek mythology, the earth goddess Demeter was unable to find her daughter Persephone after Persephone was abducted by Hades, the god of the underworld. Demeter is said to have embarked on a long and frustrating, but ultimately successful, search to find her daughter. Unfortunately, long and frustrating searches are not confined to Greek mythology. In modern times, agent-based modelers often face similar troubles when searching for agents that are to be to be connected to one another and when seeking appropriate target agents while defining agent behaviors. The result is a 'search for emergence' in that many emergent ormore » potentially emergent behaviors in agent-based models of complex adaptive systems either implicitly or explicitly require search functions. This paper considers a new nested querying approach to simplifying such agent-based modeling and multi-agent simulation search problems.« less
  • Demeter-W, an open-access software written in Python, consists of extensible module packages. It is developed with statistical downscaling algorithms, to spatially and temporally downscale water demand data into finer scale. The spatial resolution will be downscaled from region/basin scale to grid (0.5 geographic degree) scale and the temporal resolution will be downscaled from year to month. For better understanding of the driving forces and patterns for global water withdrawal, the researchers is able to utilize Demeter-W to reconstruct the data sets to examine the issues related to water withdrawals at fine spatial and temporal scales.
  • We model the current characteristics of the DEMETER Segmented Langmuir probe (SLP). The probe is used to measure electron density and temperature in the ionosphere at an altitude of approximately 700 km. It is also used to measure the plasma flow velocity in the satellite frame of reference. The probe is partitioned into seven collectors: six electrically insulated spherical segments and a guard electrode (the rest of the sphere and the small post). Comparisons are made between the predictions of the model and DEMETER measurements for actual ionospheric plasma conditions encountered along the satellite orbit. Segment characteristics are computed numericallymore » with PTetra, a three-dimensional particle in cell simulation code. In PTetra, space is discretized with an unstructured tetrahedral mesh, thus, enabling a good representation of the probe geometry. The model also accounts for several physical effects of importance in the interaction of spacecraft with the space environment. These include satellite charging, photoelectron, and secondary electron emissions. The model is electrostatic, but it accounts for the presence of a uniform background magnetic field. PTetra simulation results show different characteristics for the different probe segments. The current collected by each segment depends on its orientation with respect to the ram direction, the plasma composition, the magnitude, and the orientation of the magnetic field. It is observed that the presence of light H{sup +} ions leads to a significant increase in the ion current branch of the I-V curves of the negatively polarized SLP. The effect of the magnetic field is demonstrated by varying its magnitude and direction with respect to the reference magnetic field. It is found that the magnetic field appreciably affects the electron current branch of the I-V curves of certain segments on the SLP, whereas the ion current branch remains almost unaffected. PTetra simulations are validated by comparing the computed characteristics and their angular anisotropy with the DEMETER measurements, as simulation results are found to be in good agreement with the measurements.« less
  • This report presents the results of a customer telephone survey of the users of two software programs provided by the U. S. Department of Energy Federal Energy Management Program (FEMP) during calendar years 1995 and 1996. The primary purpose for the survey is to provide the Team Leader to FEMP Technical Assistance and members of the team with detailed customer feedback pertaining to how well selected FEMP software programs are being used and to identify areas for improvement. The information presented enables managers to see both the strengths of their software programs and software components that can be improved. Themore » survey was conducted during the fall of 1997 in conjunction with a FEMP workshop attendee survey. The results of the workshop survey are presented is a sister document entitled, ''An Evaluation of the Federal Energy Management Program's Technical Assistance Workshops.« less

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