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FINAL GISP SET_ ALL KSAs WITH 100- SURE ANSWERS.
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EUNICEFINAL GISP SET: ALL KSAs WITH 100% SURE ANSWERS
Terms in this set (488)
Federal Geographic Data Committee A United States government committee which promotes the coordinated
(FGDC) development, use, sharing, and dissemination of geospatial data on a national basis.
Content standard that adds elements to describe imagery and gridded data as well
ISO 19115-2
as data collected using instruments (monitoring stations and measurement devices)
This is product-oriented and focuses on defect identification - finding and
Quality control
eliminating sources of quality problems.
Archiving Captures, manages and analyzes data changes (most often done with databases)
The science and technology of gathering, analyzing, interpreting, distributing, and
Geomatics using geographic information (includes surveying, mapping, remote sensing, GIS,
GPS).
Merge Combines multiple input datasets of the same data type into a single new output
Clip Extracts input features that overlay the clip features (keeps the input's attributes)
Extracts features which overlap in all layers to a
new feature class ( joins the attribute tables)
Intersect
Based on the principle that the 3D location of any
point can be determined by measuring angles and
Ground surveying
distances from other know points
Disadvantages of ground surveying Expensive and time consuming
Receives signals from GPS satellites to calculate the current position and time. Four
GPS receiver satellites must be in view for it to compute four unknown quantities (three position
coordinates and clock deviation from satellite time)
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, 1. Determine the result of the field work
2. Determine what needs to be collected, inspected or surveyed (Set up a field
collection form/data dictionary)
3. Determine how it will be collected (Pen and paper, mobile tablet, Trimble unit,
drone)
Field collection process
4. Begin field collection on a good representation of the entire dataset
5. Review sample field collection and adjust the data being collected or the method
of collection
6. Plan locations and timing for field work
7. Conduct field collection for all assets.
The shape that the surface of the oceans would
take under the influence of the Earth's gravitation
and rotation alone in the absence of other
influences such as winds and tides. It is a model of
global mean sea level that is used to measure
precise surface elevations by registering the
Geoid
ocean's water level at coastal places using tide
gauges. The radius at the equator is larger than at
the poles due to the long term effects of the
earth's rotation. Mountains have more mass than
valleys, thus the pull of gravity is regionally
stronger near mountains.
This is a mathematically defined surface that
approximates the geoid, the truer figure of the
Reference ellipsoid
Earth, or other planetary body.
Fits the geoid to a first order approximation, which
is formed when an ellipse is rotated about its
Oblate ellipsoid
minor axis.
As can be seen from the dimensions of the Earth ellipsoid, the semi-major axis a and
Sphere
the semi-minor axis b only by a bit more than 21 km.
Given a point (in terms of its coordinates) and the direction (azimuth) and distance
First (direct) geodetic problem
from that point to a second point, determine (the coordinates of) that second point.
Coordinate-based local, regional, or global system used to locate geographic
Spatial reference system (SRS)
entities.
Given two points, determine the azimuth and length of the line (straight line, arc or
Second (inverse) geodetic problem
geodesic) that connects them.
Coordinate-based local, regional, or global system used to locate geographic
Coordinate reference system (CRS)
entities.
Transforming coordinates from a curved earth to a
flat map using a grid of lines of latitude and
Map projection
longitude
Model of the earth as a spheroid (2 components, reference ellipsoid and a set of
Horizontal datum survey points both the shape of the spheroid and its position relative to the earth, i.e.
by 'attaching' the ellipsoid to a monument on the earth's surface)
Reference point for elevations of surfaces and features on the earth. Could be based
Vertical datum
on tidal, sea levels, gravimetric, based on a geoid.
NAVD88 Gravity based geodetic datum in North America
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