Book 2

DEM

Stereoscopic aspects of SPOT

 

Contents

Key words

Introduction 
 

Chapter 1: Digital representation of relief and stereoscopy

          1.1 Definitions and digital representations 
                    1.1.1 Definitions
                    1.1.2 The various ways of digitally representing the relief 

          1.2 Methods of obtaining stereoscopy 
                    1.2.1 Aerial photographs 
                    1.2.2 Lateral stereoscopy 
                    1.2.3 Longitudinal stereoscopy 
                    1.2.4 Radargrammetry and radar interferometry 

          1.3 Creation using classical techniques 
                    1.3.1 Direct acquisition 
                    1.3.2 Indirect acquisition: digitization 
                    1.3.3 Advantages and disadvantages of digitization 
 

Chapter 2: The SPOT satellite and creating the DEM

          2.1 The SPOT satellite 
                    2.1.1 Geometry and the HRV view 
                    2.1.2 Pair selection criteria 

          2.2 Methods of creating a SPOT DEM 
                    2.2.1 Use of films on analog plotter 
                    2.2.2 Use of films on analytic plotter 
                    2.2.3 Automatic correlation 
                    2.2.4 Use on digital plotter 

          2.3 Quality control and precision of DEMs produced using SPOT 
                    2.3.1 Measurement criteria 
                    2.3.2 Factors influencing quality 
                    2.3.3 Self-checking methods 
 

Chapter 3: Automatic correlation on SPOT images with automatic plotting of relief 

          3.1 General about automatic correlation of images 
                    3.1.1 Principle 
                    3.1.2 Application

                  3.1.3 Possible applications of correlation 

          3.2 Mapping using SPOT images 
                    3.2.1 Orientation of the stereopair 
                    3.2.2 Matching corresponding pixels 

          3.3 Smoothing and corrections 
                    3.3.1 "Elastic grid" method 
                    3.3.2 Interactive corrections 

          3.4 Calculating the DEM 
                    3.4.1 Use of parallax 
                    3.4.2 Calculating a regular grid 

          3.5 Conclusion 
 

Chapter 4: Using DEMs

          4.1 Direct applications 
                    4.1.1 Topography 
                    4.1.2 Products to mapping standards 
                    4.1.3 Including the DEM in a GIS 
                    4.1.4 Radiometric corrections 
                    4.1.5 3D image synthesis 

          4.2 Thematic applications 
                    4.2.1 Hydrographic network and catch basins 
                    4.2.2 3D perspectives and Earth sciences 
                    4.2.3 Development plan and positioning 
 

Conclusion
Bibliography