Geomatics Engineering Products

The Spaghetti data model is a simple structure
but useful for spatial analysis – F
Three Types of Grid Systems – 1. Lat/Long
2. Military Grid
3.Alphanumeric Grid
Sources of Digital Data – Data collectors, stereoplotters, GPS, Scanners, Digitizers, Aerial Photos, Satellite Data
COGO – coordinate geometry, accurate and slow
survey data is in this format
GLO – general land office, now called B.L.M = bureau of land management
Assumed Meridian – Can be established by merely assigning any arbitrary direction to a line
Project name, location, date, time of day, and starting and finishing times – Field note entries that are necessary to document the notes and furnish a timetable as well as to correlate different surveys
3 Segments of GPS – Space segment, control segment, and user segment.
What does a dimensionless map scale mean as found in a GIS or map? – it means the scale is 1:100, so multiply any point by 100 for any unit
Assumed Meridian – Can be established by merely assigning any arbitrary direction to a line
contour line – a line on a map that connects points of equal elevation based on a vertical datum, usually sea level
data elements of GIS – spatial database, attribute database
x. How is the receiver's time bias determined? – The receivers time bias is the 4TH unknown and is determined by a 4TH SV
Topography – Surface features both natural and cultural, collectively depicted on topographic maps.
explain raster-vector conversion – 1) put raster value in computer
2) scan and identify edge
3)convert edge into a series of points (vector data)
30 – days after service of summons that defendent has to respond
What is a topological vector model? – A vector model that creates an intersection and places a node at each line crossing, records connectivity and adjacency, and maintains information on the relationships between and among points, lines, and polygons in spatial data.
explain raster-vector conversion – 1) put raster value in computer
2) scan and identify edge
3)convert edge into a series of points (vector data)
What is run length coding? – is a common data compression method based on recording sequential runs of raster cell values.
Neat line – It is a fine line that provides a definite frame or edge at which the various map elements terminate.

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