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GISP Exam Flashcards 2024 With Questions And 100% CORRECT ANSWERS
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GISP Exam Flashcards 2024 With Questions And 100% CORRECT ANSWERS
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GISP Exam Flashcards 2024 With Questions And 100% CORRECT ANSWERS
Terms in this set (363)
Associating a map (such as a pdf without spatial information) or image (such as an aerial image
Georeferencing
without spatial information) with spatial locations
Consisting of multiple points, points come in pairs that match the spatial location with a point on an
Control points
unreferenced image or map.
Equation for Converting Degrees, Minutes, Seconds decimal degrees = degrees + (minutes / 60) + (seconds/3600)
to Decimal Degrees
Spatial Reference System (SRS) or Coordinate Is a coordinate-based local, regional or global system used to locate geographical entities.
Reference System (CRS)
, 8/9/24, 1:12 PM
It is a three-dimensional coordinate system with a well-
defined origin (the center of mass of the Earth) and three
International Terrestrial Reference System (ITRS)
orthogonal coordinate axes (X,Y,Z).
Transforming coordinates from a curved earth to a flat map. UTM - Universal Transverse Mercator - a
Map Projection
global coordinate system - UTM zones are 6 degrees.
Model of the earth as a spheroid (2 components, reference ellipsoid and a set of survey points both
Horizontal Datum
the shape of the spheroid and its position relative to the earth).
reference point for elevations of surfaces and features on the Earth - could be based on tidal, seas
Vertical Datum
levels, gravimetric, based on a geoid
NAVD88 gravity based geodetic datum in North America
set of control points whose geometric Relationships are known, either through measurement or
Geodetic Datum
calculation
WGS 84 World Geodetic System - reference coordinate system used by the Global Positioning System (GPS)
Spatial reference system ID numbers, including EPSG codes defined by the international Association
SRID Integer
of Oil and Gas Producers.
1. Distance
2. Direction
4 Distortions
3. Shape
4.Area
Preserves shape and direction, area gets distorted - projecting earth onto a cylinder tangent to a
Mercator Projection
meridian
planar (tangent) -used for air route distances - distances measured from the center are true -
Azimuthal Equidistant
distortion of other properties increases away from the center point
preserves area, shape and distance gets distorted near the upper and lower regions of the map -
Cylindrical Equal-Area Projections straight meridians and parallels - meridians are equally spaced and the parallels are unequally
spaced
preserves directions and areas in limited areas -distorts distances and scale except along standard
Conic projections
parallels -generated by projecting a spherical surface onto a cone
Extent: Broad in East-West (e.g., the US) use a conical projection; Broad in North-South (e.g., Africa)
Choosing a Projection: Extent
use a transverse-case cylindrical projection
GISP Exam Flashcards 2024
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