Geoinformatics
Online ISSN : 1347-541X
Print ISSN : 0388-502X
ISSN-L : 0388-502X
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Volume 14, Issue 4
Displaying 1-4 of 4 articles from this issue
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Article
  • Colored Surface Vector Maps and Their Stereoscopy to Extract Geomorphological Features
    Takako NAKAMURA, Tetsuya SHOJI
    Article type: Article
    2003 Volume 14 Issue 4 Pages 277-284
    Published: 2003
    Released on J-STAGE: June 30, 2005
    DOIhttps://doi.org/10.6010/geoinformatics.14.277
    JOURNAL FREE ACCESS
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    When a normal vector of slope surface ("surface vector" here) is shown as a point on a Wulff's net overlaying the basal plane of the HSI color cone, the vector is displayed by a color on a map. Accordingly, this map shows spatial distribution of surface vectors, each of which represents a slope direction and a slope degree at a point. The surface vector map is very useful to extract geomorphological features such as faults, linear structures, ring structures and others. If a stereo-pair of a surface vector map showing topography is provided, characteristic geomorphologies are extracted easier.
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  • Evaluation of Geoscience Information
    Tetsuya SHOJI
    Article type: Article
    2003 Volume 14 Issue 4 Pages 285-299
    Published: 2003
    Released on J-STAGE: June 30, 2005
    DOIhttps://doi.org/10.6010/geoinformatics.14.285
    JOURNAL FREE ACCESS
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    Evaluation of geoinformation has been discussed in order to optimize a geoscience survey. The discussion suggests that 1) geoinformation can be evaluated by either of variance or entropy, and 2) entropy is more advantageous, because, if a target area consists of many geologic units, entropy diverges with increasing number of geologic units, but variance converges. A simple model suggests a probability that surveying a narrow area with a high resolution technique is rarely more advantageous than surveying a wide area with a low resolution technique. The model suggests that low resolution techniques are applied at early stages of a survey, and that higher resolution techniques should alternate them with progressing survey.
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Development of System and Software
  • A PROTOTYPE OF DATABASE SYSTEM FOR SEISMOLOGICAL DATA - SEISMO
    NOJIMA FAULT AREA CASE
    Marina PERVUKHINA, Yasuto KUWAHARA, Hisao ITO
    Article type: Development of System and Software
    2003 Volume 14 Issue 4 Pages 301-310
    Published: 2003
    Released on J-STAGE: June 30, 2005
    DOIhttps://doi.org/10.6010/geoinformatics.14.301
    JOURNAL FREE ACCESS
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    A prototype of a geoscience information system was designed for the treatment of seismological data obtained by an integrated system of surface and borehole arrays at the vicinity of the Nojima fault, responsible to the Kobe earthquake in 1995 (Hyogo-ken Nanbu earthquake M7.2). The information system includes a database (DB) as the core of the system, provided by the graphic user interface (GUI) and allow visualization and treatment of spatial objects and seismic waveforms. Information about earthquake hypocenters and measuring techniques are stored in the relational database, which allows quick selection of the data respond to certain criteria. It is demonstrated that the SEISMO database system development reduces the time required for time-consuming phases of selection, treatment and visualization of the data in a scientific process.
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