Gis Test 2

Front 1

estimated Earth’s circumference to be about 25000 miles

Back 1

Eratosthenes

Front 2

introduced “minutes” and “seconds” for subdividing a degree introduced ideas on how to make cartography more scientific

Back 2

Ptolemy

Front 3

For every record in the “parent” there
is one and only only match in the “child”

Back 3

One-to-One Correspondence

Front 4

Several records in the parent match to one and only one record in the child

Back 4

Many-to-One Correspondence

Front 5

One record in parent relates to many in the child table.

Back 5

One-to-Many

Front 6

a single location that
is part of a line segment – it gives an arc shape

Back 6

VERTEX

Front 7

Keeps track of which arcs are
connected to each other (by
common nodes)

Back 7

Arc-node topology

Front 8

Keeps track of which arcs make
up a specific polygon

Back 8

Polygon-Arc Topology

Front 9

Keeps track of which polygons
are adjacent to each other

Back 9

Left-Right Topology

Front 10

What first comes to mind when you hear the term “vector data” ?

Back 10

Points, lines, polygons

Front 11

grid of elevation points
Widely used in GIS as source of elevation data

Back 11

DEM - Digital Elevation Model

Front 12

Digital representation of “line” features

Back 12

DLG – Digital Line Graph

Front 13

- Scanned image of USGS topographic map
- Referenced to UTM coordinate system

Back 13

DRG – Digital Raster Graphics

Front 14

- computer generated image of an aerial photograph
- image displacement removed (terrain and camera tilt)
- referenced to the UTM projection

Back 14

DOQ – Digital Orthophoto Quads

Front 15

- historical land use and land
- from manual interpretation of 1970’s and 1980’s aerial photos
- census and political boundaries, hydrography, federal ownership

Back 15

LULC – Land Use / Land Cover

Front 16

Raster Data Properties…

Back 16

A cell has a resolution
Every cell knows its ground location
Every cell knows its neighbors