6. Analytical Photogrammetry
In this section we go one step further to learn ‘how to extract quantitative information from the Aerial photos’, which is generally referred as analytical photogrammetry. Specifically, the section explains the geometrical relationships that can be derived between aerial photographs and the ground, height/elevation measurement, the concept of parallax, the production of stereomodels and stereoplotters.
This is the sixth unit in the module ‘Topographic Data Analysis Techniques and Applications’. In this unit introduce photogrammetry and aerial photo interpretation.
- Basic parameters
- Measuring Height
- Parallax
- Stereoplotters
‘Basic parameters’ introduces some basic concepts of analytical photogrammetry. It explains the geometry of image acquisition, and issues of overlap between photos in a survey series.
‘Measuring Height’ extends the parameters of aerial photographs which have already been covered, to introduce the concept of making quantitative measurements of the heights of objects on the ground from aerial photos.
‘Parallax’ introduces the concept of parallax and demonstrates its utility in estimating the heights of objects on the ground from pairs of aerial photos.
‘Stereoplotters’ introduces stereoplotters, explaining their evolution, operation and role in the automatic generation of data from aerial photos.