It is necessary to be familiar with some of the basic quantities and relationships, particularly between the altitude of the sensor, scale and resolution.<\/p>\n

1. What is the normal flying height of a passenger aeroplane?<\/p>\n

2. What is the normal flying height of photogrammetry aircraft?<\/p>\n

3. Can you draw a diagram depicting the scale variation with altitude? (assume for example that the focal length of the camera as 152mm)<\/p>\n

4. Can you draw a diagram showing the relationship between spatial resolution and scale?<\/p>\n

\u00a0<\/p>\n

1. Typically 25000 to 27000 feet (Altitudes in civil aviation are generally described in feet). This equates to approximately 8000 to 11000 metres. See http:\/\/www.ehow.com\/facts_5061375_altitude-plane-flight.html<\/a><\/p>\n

2. Approximately 6000 feet (2000 metres) - again, check on the web.<\/p>\n

3. For calculating scale you need to know the flying height and focal length. f is given, so vary the H and find the scale. Then, plot scale vs. altitude.<\/p>\n

4. In the mapping domain, the minimum separable unit is referred to as the thickness of the drawing pen, in other words the finest line one can draw on a map. Generally, 0.25mm is considered as the MSU. In the satellite domain, a pixel is the minimum mapping unit and hence the spatial resolution of the satellite becomes the MSU. If we assume 1m as the spatial resolution then scale = 0.25mm x scale = 1m and hence scale = 1000mm\/0.25mm = 1:4000 approximately.<\/p>\n

\u00a0<\/p>\n<\/div><\/div>

Incorrect<\/span><\/div><\/div><\/div><\/div>\n

References<\/h4>\n
Lillisand, T. M., Kiefer, R. W. and Chipman, J. W. (2003) Remote Sensing and Image Interpretation<\/em> (5th ed.). New York: Wiley. Chapters 2,3.<\/p>\n
Jacobsen, K. (2005) High Resolution Satellite Imaging Systems – Overview. https:\/\/www.isprs.org\/proceedings\/XXXVI\/1-W3\/PDF\/038-jacobsen.pdf<\/a><\/p>\n
Schreier, G. & Dech, S. (2005) High resolution earth observation satellites and services in the next decade \u2013 a European perspective. http:\/\/dx.doi.org\/10.1016\/j.actaastro.2005.03.029<\/a><\/p>\n
Hu, Y., Tao, V., and Croitaru, A. (2004) Understanding the Rational Function Models: methods and Applications. ISPRS XXXV. http:\/\/www.isprs.org\/proceedings\/XXXV\/congress\/comm4\/papers\/423.pdf<\/a><\/p>\n
Eineder, M., Yague-Martinez, N., Minet, C., Fritz, T., and Parizzi, A. (2010) Report on Haiti Earthquake Surface Shift Estimation Using TerraSAR-X Data.\u00a0 Remote Sensing Technology Institute, DLR.<\/p>\n
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References<\/h4>\nLillisand, T. M., Kiefer, R. W. and Chipman, J. W. (2003) Remote Sensing and Image Interpretation<\/em> (5th ed.). New York: Wiley. Chapters 2,3.<\/p>\n