Map, Journal of the Japan Cartographers Association
Online ISSN : 2185-646X
Print ISSN : 0009-4897
ISSN-L : 0009-4897
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Volume 49, Issue 2
Displaying 1-9 of 9 articles from this issue
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Original Article
  • The Principle of the Polyhedric Projection Used for Old Japanese Topographic Maps
    Hiroshi Masaharu
    2011 Volume 49 Issue 2 Pages 1-7
    Published: 2011
    Released on J-STAGE: November 07, 2015
    DOIhttps://doi.org/10.11212/jjca.49.2_1
    JOURNAL FREE ACCESS
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    Old Japanese topographic maps made before 1960's were based on polyhedric projection. It is necessary to know the characteristics of the projection so as to use these old topographic maps for measuring positions on the map and overlaying time series geographic information. The principle of the polyhedric projection is considered to be rather simple and they are explained in many books. However, explanations in those books differ mutually and they cause confusion.
    This paper clarifies the method of the polyhedric projection used for the Japanese topographic maps according to old authoritative documents. This makes it possible to accurately measure the geographic position expressed on the old maps.
    Based on this actual method of projection, five kinds of explanations about the polyhedric projection are examined. These explanations describe principle of the polyhedric projection as (1) gnomonic projection and (2) orthographic projection on a plane that passes through four points on the Earth defining the corner of the map, (3) polyconic projection, (4) secant conic projection, and (5) sinusoidal projection. It is concluded that these explanation except for the sinusoidal projection have no detectable differences within the small size of one map sheet which is the extent the polyhedric projection is applied. In this sense these different explanations apply enough to the polyhedric projection. But from the viewpoint of the conceptual conformity, it is concluded that the explanations as polyconic and equidistant conic projections are most suitable to describe the actual characteristics of the polyhedric projection.
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Research Notes
  • Teaching Materials Development for Satellite Data Interpretation
    Hideki OSHIMA, Hiroshi OTA, Hiromichi FUKUI
    2011 Volume 49 Issue 2 Pages 8-15
    Published: 2011
    Released on J-STAGE: November 07, 2015
    DOIhttps://doi.org/10.11212/jjca.49.2_8
    JOURNAL FREE ACCESS
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    In this study interpretation were tried and evaluated effects in junior and senior high schools' regular classes based on textbook curriculums. It includes greenbelt coverage ratio analysis and heat island analysis using infrared image of satellite data.
    5 interpretation themes related textbooks contents of junior and senior high schools' social studies, science and information studies and satellite data are used around each school for; (1) Finding green area around our school with infrared satellite images, (2) Looking at temperature distribution around our school with satellite images, (3) Looking at landform around our school with 3D satellite images and topographical maps, (4) Finding fault lines around our school with satellite images and (5) Looking at land use change around our school with satellite images.
    These interpretation were carried out in a private junior high school; KEIO Futsubu school. Students were asked what they were interested in and disinterested in, and reasons in questioner researches. More than 60% students answered they were interested in each themes. Reasons were categorized these 5 items; a) They were originally interested in the theme, b) They learned new knowledge, c) Results of interpretation were different from their hypotheses, d) Interpretation made them interested in, e) Interpretation itself were interesting. It was cleared that testing hypotheses with interpretation made students more attractive.
    The ways of providing satellite image to each junior and senior high schools all over the country were also discussed. Though web GIS should be used in PC rooms with high speed internet, desktop GIS software may be used with low speed internet using GIS data downloaded by teachers before lecture. These desktop GIS software may be used; Quantum GIS, free software and Chizu Taro, well used. Preprinted screen image of web GIS may be used in regular classroom without PC. They can make interpretation whether they have PC rooms with high speed internet or not in these ways.
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