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    Gy4006 L6 Gis 2023

    Uploaded by

    Karrie Chambers
    The document discusses different types of map projections used to represent the spherical Earth on a flat surface. It addresses key aspects of different projections, including whether they preserve angles, areas, or sizes. Projections discussed include Mercator, Gall-Peters, Mollweide, conic, and polyhedral. The document also covers Ireland's national grid system and transition to a transverse Mercator projection for greater compatibility with GPS. Finally, it briefly introduces vector data and attribute data as key concepts in geographic information systems.

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    Gy4006 L6 Gis 2023

    Uploaded by

    Karrie Chambers
    8 views39 pages
    The document discusses different types of map projections used to represent the spherical Earth on a flat surface. It addresses key aspects of different projections, including whether they preserve angles, areas, or sizes. Projections discussed include Mercator, Gall-Peters, Mollweide, conic, and polyhedral. The document also covers Ireland's national grid system and transition to a transverse Mercator projection for greater compatibility with GPS. Finally, it briefly introduces vector data and attribute data as key concepts in geographic information systems.

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    GY4006+L6+GIS+2023

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    The document discusses different types of map projections used to represent the spherical Earth on a flat surface. It addresses key aspects of different projections, including whether they preserve angles, areas, or sizes. Projections discussed include Mercator, Gall-Peters, Mollweide, conic, and polyhedral. The document also covers Ireland's national grid system and transition to a transverse Mercator projection for greater compatibility with GPS. Finally, it briefly introduces vector data and attribute data as key concepts in geographic information systems.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    8 views39 pages

    Gy4006 L6 Gis 2023

    Uploaded by

    Karrie Chambers
    The document discusses different types of map projections used to represent the spherical Earth on a flat surface. It addresses key aspects of different projections, including whether they preserve angles, areas, or sizes. Projections discussed include Mercator, Gall-Peters, Mollweide, conic, and polyhedral. The document also covers Ireland's national grid system and transition to a transverse Mercator projection for greater compatibility with GPS. Finally, it briefly introduces vector data and attribute data as key concepts in geographic information systems.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 39

    GY4006

    Practicing Geographic Research


    Maps and GIS

    Part I: Map Projections


    What’s the point of mapping? GY4006: Geographic Research

    Numerous questions are best answered by mapping


    • How to get from A to B
    • What’s at C?
    • Where does X occur?
    • Are there geographic patterns in Y?
    • Where’s the best place for Z? (e.g. housing, schools, transport)

    Not all maps are created equal. Crucial to use the right map.
    Cylindrical Map Projections GY4006: Geographic Research
    Cylindrical Projection GY4006: Geographic Research
    Cylindrical Projection GY4006: Geographic Research
    Mercator Projection GY4006: Geographic Research

    ✓ Angles
    (conformal)

    ✗ Areas
    Mercator Projection GY4006: Geographic Research

    ✓ Angles
    (conformal)

    ✗ Areas
    Mercator Projection GY4006: Geographic Research

    ✓ Angles
    (conformal)

    ✗ Areas

    https://projectlovelace.net/problems/flight-paths/
    Mercator Projection GY4006: Geographic Research

    ✓ Angles
    (conformal)

    ✗ Areas

    https://projectlovelace.net/problems/flight-paths/
    Mercator Projection GY4006: Geographic Research

    ✓ Angles
    (conformal)

    ✗ Areas

    Credit: Neil Kaye/@neilrkaye


    Gall-Peters Projection GY4006: Geographic Research

    ✗ Angles

    ✓ Areas
    Gall-Peters Projection GY4006: Geographic Research

    ✗ Angles

    ✓ Areas
    Tangent and Secant Projections GY4006: Geographic Research

    One standard parallel

    Two standard parallels


    Gall-Peters Projection GY4006: Geographic Research

    ✗ Angles

    ✓ Areas
    Mollweide Projection GY4006: Geographic Research

    ✗ Angles

    ✓ Areas
    Mollweide Projection GY4006: Geographic Research

    ✗ Angles

    ✓ Areas
    Conic Projections GY4006: Geographic Research

    Conformal
    (Lambert) and
    equal area (Albers)
    variations exist
    Conic Projections GY4006: Geographic Research
    Albers Projection GY4006: Geographic Research

    ✗ Angles

    ✓ Areas
    Albers Projection GY4006: Geographic Research

    ✗ Angles

    ✓ Areas
    Albers Projection GY4006: Geographic Research

    Commonly used for


    maps of the USA

    ✗ Angles

    ✓ Areas
    Lambert Projection GY4006: Geographic Research

    ✓ Angles

    ✗ Areas
    Lambert Projection GY4006: Geographic Research

    ✓ Angles

    ✗ Areas
    Lambert Projection GY4006: Geographic Research

    Usual map projection used by the EU


    for maps of Europe

    ✓ Angles

    ✗ Areas
    Polyhedral map projections GY4006: Geographic Research
    Dymaxion Projection GY4006: Geographic Research

    ✗ Angles

    ✗✓ Areas

    ✗✓ Sizes
    Dymaxion Projection GY4006: Geographic Research

    ✗ Angles

    ✗✓ Areas

    ✗✓ Sizes
    GY4006
    Practicing Geographic Research
    Maps and GIS

    Part II: Maps of Ireland


    Maps of Ireland GY4006: Geographic Research
    The shape of the Earth GY4006: Geographic Research

    Geoid: The shape of the world if it was


    all ocean, with no tides etc.
    Ellipsoid: Mathematical model of the
    shape of the Earth
    The Irish National Grid GY4006: Geographic Research

    1965: Based on modified


    Airy ellipsoid
    GPS/GNSS: Not natively
    compatible

    Still unfortunately used


    more than it should be
    The Irish Transverse Mercator Grid GY4006: Geographic Research
    Mercator Projections GY4006: Geographic Research
    Transverse Mercator Projections GY4006: Geographic Research
    The Irish Transverse Mercator Grid GY4006: Geographic Research
    GY4006
    Practicing Geographic Research
    Maps and GIS

    Part III: GIS


    Vector data GY4006: Geographic Research
    Attribute Data GY4006: Geographic Research

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