Map Projections #
The subject of map projections is fascinating. It is one of the first cases where high level mathematics had a profound impact on day to day life and, to this day, very few look at a map and fully understand the complexity hidden behind a deceptively simple object.
For anyone who gains some interest in the subject, a reference point is the publication of John P. Snyder, Map Projections  A Working Manual. To this day (it was published in 1987), it remains the reference when searching for a map projection.
John Parr Snyder (19261997) was a chemical engineer working for CIBAGeigy with a lifelong interest in maps and map projections. At the age of 50, in 1976, he attended a cartography conference and learned about the need for a new projection to be used with Landsat satellites data. He designed what become known as the Space Oblique Mercator and offered it free to US Geological Survey (USGS). Two years later he was working in USGS and, in 1987, he published this compendium of map projections.
I am not claiming any intellectual rights: this is a transcription in a new form of the original publication and it is done only as a tribute to a truly valuable work. All rights remain with the original copyright holders. I am inclined to believe that, as a U.S. government work, the original publication is in public domain (see this reference). As such, this online manual would also be in public domain. However, I am no lawyer and may want to verify this information.
Contents #

General Concepts
1. Characteristics of Map Projections
2. Latitude and Longitude
3. The Datum and the Earth as an Ellipsoid
4. Scale Variation and Angular Distortion
5. Transformation of Map Graticules
6. Classification and Selection of Map Projections 
Cylindrical Map Projections
7. Mercator Projection
8. Transverse Mercator Projection
9. Oblique Mercator Projection
10. Cylindrical EqualArea Projection
11. Miller Cylindrical Projection
12. Equidistant Cylindrical Projection
13. Cassini Projection 
Conic Map Projections
14. Albers EqualArea Conic Projection
15. Lambert Conformal Conic Projection
16. Equidistant Conic Projection
17. Bipolar Oblique Conic Conformal Projection
18. Polyconic Projection
19. Bonne projection 
Azimuthal and Related Map Projections
20. Orthographic Projection
21. Stereographic Projection
22. Gnomonic Projection
23. General Perspective Projection
24. Lambert Azimuthal EqualArea Projection
25. Azimuthal Equidistant Projection
26. ModifiedStereographic Conformal Projections 
Space Map Projections
27. Space Oblique Mercator Projection
28. SatelliteTracking projections 
Pseudocylindrical and Miscellaneous Map Projections
29. Van der Grinten Projection
30. Sinusoidal Projection
31. Mollweide Projection
32. Eckert IV and VI projections