MODULE 1 Flashcards
a world wide navigation system that became fully functional in 1994
global positioning system (gps)
gps were first used by military and as the equipment ______ in cost, by scientists and sportsmen
decrease
gps has become important in field of sciences such as
ecology, forestry, geography, geology,, surveying, limnology, and oceanography
gps permits an operator to know with great ____ his or her location on the planet
accuracy
the gps system relies on a constellation of ___ satellites l
24 NAVSTAR satellites
the satellites are positioned so that any spot on earth has access to ______ at any time
5-8 satellites
the user employs a radio receiver to ____ signals from _________ which it used to calculation ____ in space
detect; 4 or more satellites, position
the receiver can determine its own horizontal location, elevaon, speed, direction of movement and time of day. it can calculate its geographic location (2-dimensions) using data from ______ and with ______ it can calculate its ____ (3-dimensions)
3 satellites; 4 satellites; elevation
the functions of gis
capture and preparation
management
modelling and analysis
presentation
the basic elements of GIS
hardware, software, data, people, standard procedures
this determines the extend and speed the GIS will operate
hardware
encompasses the package, databases, drawings, statistics, and imaging
software
which the hardware and software handles
data
most important part of GIS
people
steps taken in a well-defined and consistent method
standard procedures
