GIS Midterm (Short)

for terms that im not used with

Coordinate Systems

is a system in which a position of a point or an object can be determined by means of numerical values which may be a single number or a group of numbers.

Global Positioning System

Meaning of GPS?

Geographic Coordinate System (GCS)

defines the location of an object on a spherical (or spheroidal) model of the earth.

Geographic Coordinate System (GCS)

represents location on the earth surface by sets of numbers and/or letters. One of the numbers represents the vertical position, and the other will be the horizontal position.

Latitude

is the angle between the equatorial plane and a horizontal line that traverse through a specified object.

Equator

is an imaginary line that divides the northern hemisphere from the southern hemisphere.

Longitude

is the east‐west location of an object on the spherical model.

Projected Coordinate System (PCS)

represents the location of an object on a flat model of the earth (map)

Projected Coordinate System (PCS)

is a systematic way of transforming the spherical globe into a flat plane

Attribute Data

is the storage facility of information for a certain feature in a feature class or shapefile. It isa non‐spatial data.

Attribute Table

is how the information about the features in your shapefile or feature class is presented to the GIS user.

JOIN

appends the attributes of the non‐spatial table to the layer attribute table, making one big table.

RELATE

keeps the two tables separate but linked, so that record selections in one table cause corresponding selections in another.

Structured Query Language

SQL meaning

Digitizing

It is defined as the process of converting features into a digital format.