EDM

Question 1

based on the basic principle that the time required for a
radio or light wave to travel from one end of a line to the
other is a function of the length measured.

Answer 1

Electronic Distance Measurement (EDM)

Question 2

• transmit wavelengths within or slightly beyond the
  visible region of the spectrum

Answer 2

Electro-Optical Instruments

Question 3

• transmits microwaves with wavelengths of 1.0 to
  8.6 mm
• consists of two identical units which includes a
  transmitter and a receiver

Answer 3

Microwave Instruments

Question 4

distances less than 25 km

Answer 4

Short range

Question 5

distances from 25 km to 75 km

Answer 5

Medium range

Question 6

distances of 75 km or longer

Answer 6

Long range

Question 7

• acronym for geodetic distance meter
• an electro-optical device developed by Erik Bergstrand
  (1948)

Answer 7

Geodimeter

Question 8

• world’s second EDM instrument
• uses high frequency microwave transmission capable of measuring distances up to 80 km day or night

Answer 8

Tellurometer