Showing papers in "Computers & Geosciences in 1992"

TL;DR: The SUPCRT92 software package as discussed by the authors is a suite of three interactive FORTRAN 77 programs, including SPRONS92.DAT, which allows the calculation of the standard Gibbs free energy, enthalpy, entropy, heat capacity, and volume of each reaction specified on the RXN file through a range of conditions specified on CON file.

TL;DR: This work reviews the alternative data models available in spatial databases, and assess them from the perspective of accurate representation of geographical reality, particularly for three dimensions and time dependence.

TL;DR: The primary purpose of the algorithms and computer program is to parameterize rapidly drainage network and subcatchment properties from widely available DEMs for subsequent use in hydrologic surface runoff models, watershed discretizations, or statistical and topological evaluation of drainage networks.

TL;DR: There seems to be some uncertainty in the GIS literature regarding the use of the words data model and data structure, but there is a clear understanding of these notions in the database literature and it is possible to define analogous terms for GIS: geometric data model.

TL;DR: It is concluded that the raster model has a number of advantages over the vector model, including simplicity, low cost and speed, together with suitability for proximity analysis, modeling and simulation, intervisibility, and boolean operations.

TL;DR: Computer programs in FORTRAN 77 that calculate age spectra, Arrhenius plots, and log (rr0) plots to manually model 40Ar/39Ar diffusion data from multidomain samples are presented.

TL;DR: With the current trends in Object-Oriented Databases (OODB) and a better understanding of relationships of the Object Model with the relational Model, TIGRIS and similar GIS and GIS components will become the norm and eventually replace the current limited systems.

TL;DR: BIGD.FOR as mentioned in this paper is a program for calculating mineral-melt partition coefficients for mafic igneous systems ranging from alkali and tholeiitic basalt to andesites and dacites.

TL;DR: In this article, the code of an ANSI standard FORTRAN-77 numerical model is provided to simulate the progradation of a fjord or graben delta and the resultant fill of one or more marine basins.

TL;DR: This paper presents a novel user interface that is designed to help explore possible alternative corridors in terms of both objective space and decision space and could be modified for other spatial decision-making problems as well.

TL;DR: Results of this study show that intervisibility may be overestimated when the effects of DEM error are ignored, and that data communication is the most important computational issue in this application.

TL;DR: The links between conceptual data modeling by the user and the spatial representation available within GIS of differing designs are discussed, and a typology of system designs is suggested based on considerations of topology, polygon handling and database architecture.

TL;DR: In this article, an effective algorithm for inverting resistivity data by ridge regression is described, which uses a line search procedure in a two-stage least-squares minimization process resulting in a stable and rapidly convergent algorithm.

TL;DR: This paper is an overview ofARC/INFO and discusses the ARC/INFO conceptual architecture, data model, operators, and user interface.

TL;DR: The differences between conceptual models of the real world and the implementation of a geographical database for natural resource data in current Geographical Information Systems are examined to develop GIS that can successfully cope with both exact and inexact data types.

TL;DR: It is shown that the description of texture orientation properties obtained reflects the image pattern and scarcely depends on applied procedures and their parameters.

TL;DR: A spatial divide-and-conquer approach inherent in the quadtree data model, the basic rationale is to narrow-in on portions of each feature quickly that are on a facing edge relative to the other feature, and to minimize the number of point-to-point Euclidean distance calculations that must be performed.

TL;DR: In this article, a general 1-D finite difference model written in FORTRAN has been developed which can be used to examine the effect of high-diffusivity paths on partial and total concentration profiles within a homogeneous isotropic sphere, infinite cylinder, and infinite slab.

TL;DR: The Floodplain Simulation Model (FPSM) as mentioned in this paper has been improved to simulate more accurately alluvial depositional processes and to predict more aspects of alluvian architecture.

TL;DR: In this paper, a FORTRAN program is described that calculates the gravitational field and the gravity gradient tensor resulting from a system of right rectangular prisms which can be ordered into a 3D model.

TL;DR: In this paper, an adaptive solution domain (ASD) finite-element model for simulating hydrocarbon spills has been developed that is computationally more efficient than conventional numerical methods, where the solution domain for water and oil flow equations is restricted by eliminating elements from the global matrix assembly which are not experiencing significant changes in fluid saturations or pressures.

TL;DR: More objective and consistent methods are needed to assess water quality for large areas as mentioned in this paper, where a spatial model, one that capitalizes on the topologic relationships among spatial entities, is described that can be implemented on land surfaces having heterogeneous water-pollution effects.

TL;DR: The view is taken that it is necessary for a GIS to manage both real-world time and database time, and the main thrust of the paper is on the latter.

TL;DR: The program HYPER-FORM permits the input and calculation of a mineral formula from wet chemical and electron microprobe analysis and includes autosaving of data, search routines, and other database functions.

TL;DR: In this article, a new normative procedure for pelitic rocks, based on the proportions of major components (SiO2, A12O3, Fe2O 3, CaO, MgO, Na2O, K 2O, P2O5, CO2, and SO3/S), and a FORTRAN program for its calculation are presented.

TL;DR: A simple algorithm for relief shading using digital elevation models based on Lambert's cosine law which is used widely for solid modeling in computer graphics to meet the needs of various geographical applications.

TL;DR: CANPLOT is a FORTRAN-77 program for plotting such stratigraphic data on a PostScript output device, and several options are included, such as stratigraphically constrained cluster analysis of the data, and a variety of graphical enhancements for producing camera-ready figures.

TL;DR: This paper presents a method for describing the set of individual geometric objects parts to which different rendering parameters can be assigned, applicable equally to both raster and vector data, and, therefore, a contribution to the integration of vector and taster GIS.