Geog 210 Exam 1

 Pixel The basic unit for comparison in an image that is square in shape and arranged in a regular two dimensional grid Scale The ratio/relationship between a distance/area on a map and the distance/area on the ground Vector A GIS layer which stores features as geometric shapes and displays points, lines or polygons  Raster A GIS layer which stores features as an image or array of cells The term used in remote sensing to describe the offset correction in coordinate space of an image Geometric correction A cylindrical projection can distort maps in what directions? North-South or East-West In GIS, a field that describes the characteristic property of the apparent individual nature of something is a(n) attribute A GPS constellation of sattelites transmits what to the GPS unit which allows the unit to calculate your position  Binary string containing time In remote sensing, a sensor that sends out a signal and receives the signal back is a(n) active digital sensor The term used to describe a projection which controls for angle and shape is Conformal What is the term used to describe the spherical shape of the Earth's surface that includes the topographic (i.e. mountains, the actual surface) component? Geoid What are the five potential things that can happen when solar energy strikes an object? ScatteringTransmissionAbsorbtionReflectionEmission Why and how do we use SQL in GIS? Structured Quaried Language is a syntax for retrieving and manipulating data in a database. We can use it to manage rational databases by creating charts, adding data and using searches/quaries What is a relational database? A relational database uses one layer's attributes and combines them with another layer's attributes based on a common attribute field of the layer's attributes What is topology and how is it different from geometry Topology is the spacial relationship between two adjacent features, surch as points, lines and nodes. Geometry uses different polygons that are the same shape.  Erase, Union and Intersect are all common commands in GIS, please diagram and describe what each does in terms of Spatial Information. Additionally describe or diagram in the inmput and output GIS layers. Erase: Creates a new GIS layer by overlaying an input feature.Union: The geometric Intersection of the input feature class with all overlaying feature classes with their attributesIntersect: The geometric intersection of the input feature class with other select feature classes with their attributes The attributes either are the same or combined Authorkamrunsreno ID189134 Card SetGeog 210 Exam 1 Descriptionfinal exam materials from past test Updated2012-12-12T22:23:25Z Show Answers