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Stereoscopic Plotting Instruments | SURE 340, Study notes of Engineering

Ferris State University (FSU)Engineering

Prof. Robert C. Burtch

Material Type: Notes; Professor: Burtch; Class: Photogrammetry; Subject: Surveying Engineering; University: Ferris State University; Term: Spring 2008;

Typology: Study notes

Pre 2010

Uploaded on 08/07/2009

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SURE 340 - Photogrammetry 11/3/2008

Stereoscopic Plotting Instruments 1

STEREOSCOPICPLOTTING

INSTRUMENTS

CenterforPhotogrammetricTraining

FerrisStateUniversity

RCB

INTRODUCTION

•Stereoplotter

–Providesrigorous,accuratesolutionforobject

pointlocation(X,Y, Z)fromimagesappearingin

overlappingpairofphotos

•Accuracydependson3orientationprocesses

–Interiororientation

–Relativeorientation

–Absoluteorientation

Discover Study notes of Engineering Ferris State University (FSU)

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Accuracy^ – – – –^ Provides^ point^ overlappingInteriorRelativeAbsolute^ location dependsorientation^ orientation rigorous,orientation^ pair^ (X,^ of^ Y,^ accurateon^ photosZ)^ from 3 orientation^ imagessolution^ appearing^ for processes^ object^ in

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- – Projectors movement (^6) • • • • • • possible ωϕκXYZ translationtranslationtranslation(phi)(kappa)(omega) – y formust – zcapabilities rotation– x eachrotation rotation have projectoralso (^) alsorotational also called called called tip swing andtilt translational

• AnaglyphicPolarized similar system INTERIOR platen system^ VIEWING viewing ORIENTATION^ SYSTEMS • Stereo (SIA) ‐image alternator
- • (^) 1.2.3.4.RecreatesFour CenteringSettingPreparationCompensation steps off geometry diapositives the of properthefor imagediapositive of principalon the distortions the taking projectors distance camera

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MOVEMENT INDEPENDENT ORIENTATION (^) METHODOF PROJECTORS OF RELATIVE

1.2.3.4.5.6.7. ClearClearClearClearObserve introducing measuredRepeat pointsCheck pppp for 1 yyyy steps ‐atatatat p 5 py parallax 1234 yat 150%atwithwithwithwith 1 5 ‐ point 5 and until κκϕϕcorrection ”’with”’ overcorrect 6. no ω p”y exists to the by at

Right1.2.3.4.5.6.7. ClearClearClearClearObserve 150% ωRepeatCheck projector” ABSOLUTE^ DEPENDENT ppppcorrection foryyyy stepsatatatat p py (^2143) yonly:at withwithwithwithat 1 6 ‐point 5 and to (^) untilbyκbzϕ^ ORIENTATION” ” (^) the‐‐overcorrect translation translation5.METHODORIENTATION no measured py exists by^ OFparallaxat introducing points^ RELATIVE with 1 ‐ 5

• After formedNext – – LevelUnknown for step:mappingrelative model scale withorientation, of respect model isto afixed datum true to (^3) desired‐D model scale is

• Model changed varying baseIf settings for projector, model consists bx by motion • each andMinimum basescale model same (^) only bybz SCALING of of^ SCALING 2 horizontal MODEL^ MODELcontrol points needed
- • Place locationIf^ – – – A’B’UniqueSimilarlyDistanceΔ floating (^) bxdoes on^ =solution forshown (^) bxplottingnot pointmark⎜⎝⎛ equalA (^) ABas– no' B (^) BA’B’ oversheet'^ check (^) −AB, (^1) ⎟⎠⎞point compute A and change mark to bx

After^ •^ If^ projector relative^ by^ and^ Example:^ bz^ fromorientation,^ SCALING^ not^ position^ equal,^ Scalingneed^ II^ base^ MODELto^ toII’ components:move^ the^ right
• DataModel Point (^12) Point bx (^) 12 for^0 coordinates:^ 670,296.3670,766.9= ground X^ 225.00 (m)x (mm) 302.55325.70 (^) bz control^0 mm223,343.7223,347.2^ = Y (^) y(m) 716.25318.02^ +6.76 (mm)^ (^) (^) (^) bypoints:^0 mm1243.661275.24^ Zz 144.66172.27= (mm)(m) ‐8.16^ mm Map Scale:1/1,

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• 3 Proper placed for scaleTwo tilt^ – – –^ vertical^ No (^) XYconsistent (^) ‐ (^) – componentcomponentcomponents^ check (^) ingears instrumentcontrol must vertical (Φ (^ Ω (^) )pts.of (^) )be

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6.7.8. elevation^ onReadIf control similarRepeat direction model^ model model fashionelevation,steps elevation^ ofpoint^ pointelevation 5 ‐as^7 A until set introduceAdoes^ with 3 ofmodel not controlfloating agreeY is‐tilt level point^ mark (withΦ )in in B thatset

WITH •^ LEVELING SCREWS PROJECTOR LEVELINGTrial^ MODEL – Remove stereomodel (^) BARamountLEVELING any^ BYTOTHE of py ΩwithTHE applied corresponding (^) PROJECTORMODEL to left projectorΩ in rightBY projector MOVING at any point EACH in

Trial – Y motion (^) ‐amountparallax to removedeither of Φ projector applied by removing to both py at projectors one of the corners using a bz

• MECHANICALSpace projectionPreferred plotters – – – – MoreHigherBetterNeed dark MECHANICAL rodsroom notversatile overallaccuracy instrument ofbeused lightoperated stability toPROJECTION PROJECTIONrays simulate over in direct direct Fourcade’s Stereoprojector PLOTTER optical^ PLOTTER optical
• • • DiapositivesSpace O”ModelJoints changed and fixedrods aircan base areslidein placed position freedefined up intoand carriers rotateexcept by down O’O” about theirandthrough illuminated spacinggimbal joints joints can above be O’ and

Stereoscopic Plotting Instruments | SURE 340, Study notes of Engineering

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1.2.3.4.5.6.7. ClearClearClearClearObserve introducing measuredRepeat pointsCheck pppp for 1 yyyy steps ‐atatatat p 5 py parallax 1234 yat 150%atwithwithwithwith 1 5 ‐ point 5 and until κκϕϕcorrection ”’with”’ overcorrect 6. no ω p”y exists to the by at

6.7.8. elevation^ onReadIf control similarRepeat direction model^ model model fashionelevation,steps elevation^ ofpoint^ pointelevation 5 ‐as^7 A until set introduceAdoes^ with 3 ofmodel not controlfloating agreeY is‐tilt level point^ mark (withΦ )in in B thatset