Geomatics Engineering Products

Which GPS error cannot be reduced using differential corrections – Multipath
discuss vector model – based on points, lines, areas, smaller data sets, based on coordinates, accurate and attractive data
Azimuths – horizontal angles measured clockwise from any reference meridian Surveying azimuths are generally measured from north Astronomers and the military have used south as the reference direction NGS used south as its reference for Azimuths in NAD27 and north for NAD83 They can range from 0to 360 Azimuths may be geodetic, astronomic, magnetic, grid, record or assumed
xvi. C/A code – Course acquisition code is a timing code that is modulated on L1 channel only
A and B – Only section shared between both shaded
spatial analysis – investigates patterns in an between spatial data
network routing and analysis, 3D analysis, spatial statistics
right – direction of increase degrees and decrease zone number for UTM
x. Aspatial data – information not regarding location of a GIS feature
burden of production – the need to produce enough evidence that you conclude an assumption is true…
What are the 5 basic GIS Tasks? – 1)Input
2)manage
3)manipulate
4)Quarry
5)visualize
Dr. John Snow – London cholera outbreak. Tracing back to the source with map-based analysis.
Spacial Sciences/GIS – Remote sensing, imaging science, Geographical information systems (GIS), Global Navigation Satellite System (GNSS) e.g.) GPS, Geodesy, Surveying, Digital Cartography, Computer Modelling, others…key : linkages and new technologies.
disadvantages of decomp – -performance: too many tables
-disk space can be cheaper than time spent
-too mant link to link can be confusing. hard to update
Conformal Projection – A projection that preserves the correct shapes of small areas. In a conformal projection, graticule lines intersect at 90-degree angles, and at any point on the map the scale is the same in all directions. A conformal projection maintains all angles at each point, including those between the intersections of arcs; therefore, the size of areas enclosed by many arcs may be greatly distorted. No map projection can preserve the shapes of larger regions.
keeps the features and attributes
of two data layers retaining the geometry
of the input layer and the area where the
identity layer overlaps the input layer. – Identity
distance =` – travel time X speed of light
What are the 5 basic GIS Tasks? – 1)Input
2)manage
3)manipulate
4)Quarry
5)visualize
Azimuthal – (Lambert Azimuthal Equal Area) -good for global views
burden of production – the need to produce enough evidence that you conclude an assumption is true…
A GPS receiver uses trilateration to compute its own position. What are the fiducial marks that a receiver uses? – The SVs
WGS-84 – geoid model reference ellipsoid

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