Aerial Photos

Front 1

The apparent displacement of the position of a body with respect to a reference point or system, caused by a shift in the point of observation

Back 1

Parralax

Front 2

Point from which topographic displacement is radial

Back 2

Nadir

Front 3

Science or art of obtaining reliable measurements by means of photographs

Back 3

Photogrammetry

Front 4

The science or art which deals with the use of binocular vision for observation of a pair of overlapping photos

Back 4

Stereoscopy

Front 5

The distance measured along the lens axis from the real nodal point to the plane of best average definition over the entire field of view used in the aerial camera

Back 5

Focal Length

Front 6

Suspension of light-sensitive silver salts

Back 6

emulsion

Front 7

A transparent material, usually glass or gelatin, used in the optical path of a camera lens to absorb a certain portion of the spectrum and prevent its reaching the sensitized film

Back 7

filter

Front 8

Difference in light intensity between brightest highlights and darkest lowlights on a print or negative

Back 8

contrast

Front 9

Act or process of examining photographic images for the purpose of identifying objects and determining their significance.

Back 9

Aerial Photo Interpretation

Front 10

(T or F)In a true aerial photo, the pp, nadir and isocenter will not coincide.

Back 10

FALSE

Front 11

(T or F)The type of light which illuminates an object and the manner in which the light is reflected by the object determine to a large ectent the photographic properties of the object.

Back 11

TRUE

Front 12

(T or F)One of the primary advantages of the use of oblique aerial photos is the relative simplicity of the metrics involved.

Back 12

FALSE

Front 13

(T or F)Photographic filters are commonly used to control the quality of light reaching the film.

Back 13

TRUE

Front 14

(T or F)Proper stereoscope vision is ovtained with the stereoscope placed with its long axis perpendicular to the flight line and with the lesses over corresponding photo images.

Back 14

FALSE

Front 15

(T or F)The effective or working area of a vertical aerial photograph is used in mosaic preparation because this portion of the photo contains no distortion.

Back 15

FALSE

Front 16

(T or F)Some of the physical properties of an object which will affect the manner in which the object reflects light and thus its image on a photograph are: surface roughness; surface color; structural properties; angular relationship to light source and camera.

Back 16

TRUE

Front 17

(T or F)Some or all of the following trypes of info may occur as marginal data on an aerial photo: date of flight, time of day, focal length of lens, altitude of aircraft, photo number, geographic reference.

Back 17

TRUE

Front 18

(T or F)Good quality vertical aerial photos are commonly utilized as plainmetric maps.

Back 18

FALSE

Front 19

(T or F)When it is desired to reduce vertical relief exaggeration as in taking photogrraphs in very rugged terrain, the shorter focal lenth lenses should be selected.

Back 19

FALSE

Front 20

(T or F) The vertical aerial photo presents a true record of the angular relationship between objects; however, measures of horizontal distance are subject to variation because of ground elevation changes and other factors

Back 20

TRUE

Front 21

(T or F)Raster digital data files are captured as points, lines (a series of point coordinates, or areas (shapes bounded by lines)

Back 21

FALSE

Front 22

(T or F)The spatial relationships of points, lnes and polygons to one another is called topography.

Back 22

FALSE

Front 23

(T or F)In the process of establishing a GIS system it is important to note that the cost of good people is as vital as the cost of software and hardware

Back 23

TRUE

Front 24

(T or F)A fundamental prerequisite to interpreting info from remeote sensing data is an understanding of the processes affecting the recording, and display (imagery) of electromagentic energy.

Back 24

TRUE

Front 25

(T or F)Multipath interference can introduce error into a GPS position. This type of error occurs when the signal is reflected off other objects at or near the earth's surface.

Back 25

TRUE

Front 26

(T or F)Selective Availibility (S/A) was an artificial degredation of the satellite signal introduced by the Department of Defense. It caused error in a GPS position of up to 100 meters. S/A was remeoved in may of 2000 and currently is not an error consideration.

Back 26

TRUE

Front 27

(T or F)Before Differential Correction, rover files typically have an accuracy of about 12 meters (CEP). This means that 50% of the positions in the rover file would be within a 12 meter radius of the true location

Back 27

TRUE

Front 28

(T or F)The least significant source of image displacement on aerial photos is relief, i.e. differences in the reletave elevations of objects pictured.

Back 28

FALSE

Front 29

(T or F)For policy level aerial photo interpretation, fine details and extensive measurements are needed to determine the precise state of situation.

Back 29

FALSE

Front 30

(T or F)Map information in a GIS must be manipulated so that it registers, or fits with info gathered from other maps.

Back 30

TRUE

Front 31

(T or F)Any variable that can be located spatially can be used in a GIS.

Back 31

TRUE

Front 32

(T or F)Raster data files contain rows of uniform cells coded according to data values

Back 32

TRUE

Front 33

(T or F)In an accurate planimetric map, all features are depicted at their correct horizontal positions; thus, an observer has a truly vertical view of every detail shown.

Back 33

FALSE