lecture 3 Flashcards
what is etymology of data
word from latin datum meaning somthing given
data def
facts that can be analysed or used to gain knowledge
def spatial data
link between place in surgace of earth and a property (attribute such as time date lat/lon
two digital representation if geographic
vector and raster
who collects data
govournment, banks, researchers and us
what does data allow us to do
analyse important information ab what we want to know
how do we collect data (primary)
surveying observation experiments
whats primary data
data that hasnt been processed
eg of secondary data
processed surveys, images, experiments
cencus importance
only source of info ab all ppl in nz
taken single point of time evrry 5 years.alows for long term chages and measures
provides basis if revision of electoral districtu boundaries to ensure equal representation
geographic units, largest to smallest
national, regions, TLA, wards, statistical area, meshblocks
primary surveying what are the examples
land surveying, engineering surveying, mining surveying, hydrographic surveying, photogrammetry and remote sending
hydrographic surveying what navigation do they use
sound (Sonar)
how does sonar work
uses sound to navigate and to detect objects
what are the two types of sonar
single beam echo and multibeam echo
