Principles of Photogrammetry: Stereoscopic Parallax

Slides:



Advertisements
Similar presentations
Photogrammetry 1 1.
Advertisements

Final Exam Review 1 1.
Aerial Photography and Photogrammetry
Geometry of Aerial Photographs
Photogrammetry Cont.. Stereoscopic Parallax F The apparent displacement of the position of an object wrt a frame of reference due to a shift in the point.
4/30/2015 GEM Lecture 13 Content Orientation –Inner –Relative –Absolute.
Photogrammetry Quantitative Measurements from Aerial Photography Quantitative Measurements from Aerial Photography Flightlines of Vertical Aerial Photography.
CS 128/ES Lecture 10a1 Raster Data Sources: Paper maps & Aerial photographs.
Definition of common terms Errors on photo
Photogrammetry Photogrammetry is the science and technology of taking spatial measurements from photographs and preparing geometrically reliable derivative.
Geography 12: Maps and Spatial Reasoning Lecture 22: Photogrammetry and air photos for mapping Professor Keith Clarke.
CS 128/ES Lecture 9b1 Photogrammetry & Image Analysis.
Camera and filters Photographic Sensors Flight Plan Dr. M. M. Yagoub Department of Geography Faculty of Humanities and Social Sciences United Arab Emirates.
Flightline of Vertical Aerial Photography
Photogrammetry Chapter 6 Introduction to Remote Sensing
Acquisition of Aerial Photographs Lecture 8 prepared by R. Lathrop 9/99 Updated 9/03 with reference to material in Avery & Berlin 5th edition.
Basics of Imaging Systems II Preparatory Session Lecture 2 Prepared by R. Lathrop 9/99, updated 9/01, 8/03, 9/04 based on material in Avery & Berlin 5th.
Experimental aerial photogrammetry with professional non metric camera Canon EOS 5D Galileo Geo Sustavi Ante Sladojević, Goran Mrvoš.
Photogrammetry Cont.. Stereoscopic Parallax F The apparent displacement of the position of an object wrt a frame of reference due to a shift in the point.
Photogrammetry is the science and technology of taking spatial measurements from photographs and preparing geometrically reliable derivative products.
Basics of Imaging systems Lecture 3 prepared by Rick Lathrop 9/99 revised 9/06.
Angles of Elevation 8-4 and Depression Warm Up Lesson Presentation
Angles of Elevation 8-4 and Depression Warm Up Lesson Presentation
Word Problems for Right Triangle Trig. Angle of Elevation: The angle above the horizontal that an observer must look at to see an object that is higher.
Remote Sensing and Image Processing PDF Aerial Photography and Photogrammetry.
Photogrammetriy & Remote sensing
9/17/2015 GEM Lecture 20 Content Flight preparation –Equipment –Weather conditions –Flying height –Coverage.
The Pythagorean Theorem
Washington University ChE 433 Digital Process Control Laboratory Pressure and Level Control Lecture.
Remote Sensing Geometry of Aerial Photographs
Angles of Elevation and Depression 8-4 Holt Geometry.
Lecture 12 Content Stereoscopic parallax 4/23/2017 GEM 3366.
Warm Up 1. Identify the pairs of alternate interior angles. 2. Use your calculator to find tan 30° to the nearest hundredth. 3. Solve. Round to the nearest.
Aerial Photography.
Principles of Photogrammetry: Stereoscopic Parallax
Copyright © 2011 Pearson, Inc. 4.8 Solving Problems with Trigonometry.
Introduction to the Principles of Aerial Photography
EXAMPLE 4 Find the height of an equilateral triangle Logo
Chapter 6 Photogrammetry. n Perspective (central) projection: aerial photographs vs. maps n Co-linearity equation n Photogrammetric orientation n Digital.
Photogrammetry.
Chapter 4 Photogrammetry
Holt Geometry 8-4 Angles of Elevation and Depression Warm Up 1. Identify the pairs of alternate interior angles. 2. Use your calculator to find tan 30°
Introduction to Soft Copy Photogrammetry
Stereovision and Photo Interpretation 3-dimensional viewing of aerial photos.
Warm Up Cos(u) = 3/5 0 degrees
Teacher’s Notes: Digital Image Sources Digital images from space can be found at the following NASA web site: Click.
Introduction to Aerial Stereo Photographs
Point Value : 50 Time limit : 5 min #1 At a sand and gravel plant, sand is falling off a conveyor and into a conical pile at the rate of 10 ft 3 /min.
Measuring Features on Aerial Photographs Determining scale and measuring areas and height.
Holt Geometry 8-4 Angles of Elevation and Depression 8-4 Angles of Elevation and Depression Holt Geometry Warm Up Warm Up Lesson Presentation Lesson Presentation.
Angles of Elevation and Depression
Warm Up 1. Identify the pairs of alternate interior angles. 2 and 7; 3 and 6.
Lecture 4. Pressure. 4.1 Pressure and it units Pressure = “the normal (perpendicular) force per unit area” Pressure at the bottom of the static (nonmoving)
Photogrammetry 1 آ. رحمانی زاده 1 فصل 11 : برنامه ريزي پرواز (پروژه) 50 Slides.
فصل 8 : برجسته بيني و پارالاكس
فصل 7 : مشخصات و هندسه عکس قائم
Week Nine Image Interpretation and Photogrammetry
Quality of Images.
Area of Trapezoid.
Stereo Images.
Other Cruise Methods.
사진측량 Photogrammetry 강원대학교 지구물리학과 이훈열 교수
Pergeseran Relief & Triangulasi Udara
GS 5102: Introduction to Remote Sensing
Camera and filters Photographic Sensors Flight Plan
Chapter 6. Photogrammetry
Objective: Investigating the factors affecting parallax
To find the refractive index of a liquid
What are the constraints Trial 1 Trial 2 Trial 3 Trial 4
Remote Sensing and Image Processing PDF Aerial Photography and Photogrammetry.
Presentation transcript:

Principles of Photogrammetry: Stereoscopic Parallax

Stereoscopic Parallax The displacement of an object caused by a change in the point of observation is called parallax. Stereoscopic parallax is caused by taking photographs of the same object but from different points of observation. Graphic from http://www.ccrs.nrcan.gc.ca/ccrs/learn/tutorials/stereosc/chap4/

Stereoscopic parallax Note the displacement between the top and base of the storage towers in this photo stereo-pair Line of Flight top bottom

Absolute stereoscopic parallax PP = Principal point = center of photo CPP = Conjugate principal point = adjacent photo’s PP Absolute stereoscopic parallax  the average photo base length = average distance between PP and CPP Photo base PP CPP PP

Differential parallax Differential parallax - the difference between the stereoscopic parallax at the top and base of the object. 15.2 mm 13.5 mm dP = 15.2mm – 13.5mm = 1.7 mm

Computing height using stereoscopic parallax h = (H’) * dP / (P + dP) where h = object height H’ = flying height dP = differential parallax P = average photo base length

Calculating Object Heights using Stereoscopic parallax Following example taken from: T.E. Avery & G.L. Berlin. 1992, Fundamentals of Remote Sensing and Air Photo Interpretation, MacMillan P Photo 1 Photo 2 dP = 2.06-1.46 = 0.6 in 1.46 2.06 Calculating the height of the Washington Monument via stereo parallax

Example: Computing height using stereoscopic parallax h = (H’) * dP / (P + dP) where h = object height H’ = flying height = 4,600ft dP = differential parallax = 0.6in P = average photo base length = 4.4in h = (4,600ft * 0.6in) / (4.4in + 0.6in) = 2760 ft in / 5 in = 552 ft True height = 555.5 ft

Alternate formulation: taken from one photo h = (H’) * d / (r) where h = object height H’ = flying height = 4,600ft d = relief displacement from base to top = 0.6in same as dP r = distance from PP to top of object same as (P + dP) h = (4,600ft * 0.6in) / (5.0in) = 2760 ft in / 5 in = 552 ft

Calculating Object Heights Object heights can be determined as follows: calculate flight altitude (H’) by multiplying the RF denominator by the focal length of the camera h = d * H’ / r where: h = Object height d = length of object from base to top r = distance from P.P. to top of object d r r

Example: Calculating object height from relief displacement Photo Relief displacement for Tank, d = 2.0 mm Radial distance from P.P. to top of Tank, r = 71.5 mm Flying Height above terrain, H’ = 918 m d r

Example: Calculating object height from relief displacement Photo Relief displacement for Tank, d = 2.0 mm Radial distance from P.P. to top of Tank, r = 71.5 mm Flying Height above terrain, H’ = 918 m h = d * H’ / r = (2.0 mm * 918 m) / 71.5 mm = 25.7 m = 26 m

Stereoscopic Instruments Parallax wedge - simplest device for determining differential parallax Parallax bar - movable floating mark can placed at base and tops of objects to measure differential parallax