Surveyor Transit

How to judge the distance by estimation?

Does anyone know how to estimate distance when u looking at something far far away?

eg. a boat in the ocean, using ur hand as a ratio and estimating the size of the boat and calculate the distance.????
does this work?

any other good ways?

Comparing size with your hand to determine distance as you suggest requires that you know the height of the object.

Radioshack sells a device to measure distances at the golf course. It assumes that the flag is a standard height so it compares its apparent height to a scale calibrated in yards.

Without knowing such a height for comparison you range measurement will only be as good as your estimate of the object size.

Our eyes measure distance by the angles our eyes make when looking at an object. THis is why your eyes cross when looking at the tip of your nose. Each eye is taking a seperate image from a different horizontal position (the space between your eyes) and the muscles are angling each eyeball so as to provide a smooth image (no overlap) This is how we can tell if something is close or far away.

This concept was used in Artillery of WW1 and prior to electronic ranging. A special set of binoculars with the lenes several feet apart were used to measure range. A set of prisims and mirrors would be adjusted so that the overlapping images would focus on the object of interest (a tank etc) when the images aligned it was easy to compute the range using trigometery as a base distance between left and right lenses was known and measured angles determined. In combat a calibrated scale was provided on the adjustment knob so very quick range measurments could be determined.

A device such as this would be useful on a moving platform such as a ship as it is a quick measurement. If you use a surveyor transit you can determine ranges and elevations of fixed objects quickly by using similar technique by moving the transit a known horizontal distance and measuring angles to a fixed object.

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CST Berger 54 140B Transit Level Surveyor Scope Sight w Case Used
CST Berger 54 140B Transit Level Surveyor Scope Sight w Case Used
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Dietzgen Surveyors Transit Level 65403
Dietzgen Surveyors Transit Level 65403
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15 Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instrument
15 Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instrument
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15 Brass Theodolite Transit Surveyor Alidade Construction Surveying Instruments
15 Brass Theodolite Transit Surveyor Alidade Construction Surveying Instruments
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Wild Heerbrugg Model T1A Surveyors Transit and Tripod
Wild Heerbrugg Model T1A Surveyors Transit and Tripod
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K  E PARAGON SURVEYING TRANSITKEUFFEL  ESSER COMPASS SURVEYORSTHEODOLITE
K E PARAGON SURVEYING TRANSITKEUFFEL ESSER COMPASS SURVEYORSTHEODOLITE
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VINTAGE FENNEL KASSEL SURVEYOR TRANSIT  95031 TRANSIT SCOPE GERMANY GCE028557
VINTAGE FENNEL KASSEL SURVEYOR TRANSIT 95031 TRANSIT SCOPE GERMANY GCE028557
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Vintage Surveyor Transit Sears Simpson with 58x6x6 tripod base and accessories
Vintage Surveyor Transit Sears Simpson with 58x6x6 tripod base and accessories
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Sears Craftsman Transit Level Surveyor model 78946115
Sears Craftsman Transit Level Surveyor model 78946115
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Vintage BRUNSON MODEL 50 Engineers Transit McClellan AFB SURVEYORS LEVEL RARE
Vintage BRUNSON MODEL 50 Engineers Transit McClellan AFB SURVEYORS LEVEL RARE
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Vintage Wood Surveyors Survey Transit Pole Extendable Stick
Vintage Wood Surveyors Survey Transit Pole Extendable Stick
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Vernier Transit Theodolite For Surveying  Construction  Surveyor Instrument
Vernier Transit Theodolite For Surveying Construction Surveyor Instrument
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DAVID WHITE 9 ft SURVEYORS TRANSIT 3 PIECE FOLDING STICK
DAVID WHITE 9 ft SURVEYORS TRANSIT 3 PIECE FOLDING STICK
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Antique Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instruments
Antique Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instruments
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Antique Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instruments
Antique Brass Theodolite Transit Surveyors Alidade Vintage Surveying Instruments
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Vintage 15 Large Brass Optical Surveyors THEODOLITE Transit Surveying Alidade
Vintage 15 Large Brass Optical Surveyors THEODOLITE Transit Surveying Alidade
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Vintage 15 Large Brass Optical Surveyors THEODOLITE Transit Surveying Alidade
Vintage 15 Large Brass Optical Surveyors THEODOLITE Transit Surveying Alidade
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Dietzgen Surveyors18 inch Transit Level 63110
Dietzgen Surveyors18 inch Transit Level 63110
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A VERY FINE BERGER SURVEYORS 190 A TRANSIT WITH A VERY NICE CASE
A VERY FINE BERGER SURVEYORS 190 A TRANSIT WITH A VERY NICE CASE
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made in Ukraine modern optic surveyor transit level N 3KL BOX h 3kl
made in Ukraine modern optic surveyor transit level N 3KL BOX h 3kl
$35.00
DAVID WHITE SURVEYORS TRANSIT MODEL 8300 W CASE
DAVID WHITE SURVEYORS TRANSIT MODEL 8300 W CASE
$200.00
SOKKISHA DOUBLE CENTER LIETZ THEODOLITE TM20C TRANSIT LEVEL SURVEYOR SURVEY
SOKKISHA DOUBLE CENTER LIETZ THEODOLITE TM20C TRANSIT LEVEL SURVEYOR SURVEY
$250.00
Vintage Wood Surveyors Survey Transit Range Pole Stick Engineers
Vintage Wood Surveyors Survey Transit Range Pole Stick Engineers
$35.00
K  E PARAGON SURVEYING TRANSITKEUFFEL  ESSER COMPASS SURVEYORSTHEODOLITE
K E PARAGON SURVEYING TRANSITKEUFFEL ESSER COMPASS SURVEYORSTHEODOLITE
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Brass Theodolite15 Surveyors Transit AlidadeConstruction Surveying Instrument
Brass Theodolite15 Surveyors Transit AlidadeConstruction Surveying Instrument
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VINTAGE Vesco Transit Wood Surveyors Grade Stick Gradechecker Survey Very Rare
VINTAGE Vesco Transit Wood Surveyors Grade Stick Gradechecker Survey Very Rare
$50.00
++ THS SURVEYORS TRANSIT NO 262 31726
++ THS SURVEYORS TRANSIT NO 262 31726
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Diezgen Theodolite Model 6170 Surveyors Transit
Diezgen Theodolite Model 6170 Surveyors Transit
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David White 8114 Surveyors Transit Level w Case Theodolite Construction Tool
David White 8114 Surveyors Transit Level w Case Theodolite Construction Tool
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David White 8114 Surveyors Transit Level Theodolite Construction Tool
David White 8114 Surveyors Transit Level Theodolite Construction Tool
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Antique Fennel Kassel Surveyors Transit No 132668 with wooden box
Antique Fennel Kassel Surveyors Transit No 132668 with wooden box
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1900 VINTAGE ANTIQUE TRANSIT SURVEY SURVEYOR COMPASS LEVEL W  EL GURLEY STADIA
1900 VINTAGE ANTIQUE TRANSIT SURVEY SURVEYOR COMPASS LEVEL W EL GURLEY STADIA
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