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Eckert IV vs. Nell-Hammer modified

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Projection No. 1:

Projection No. 2:

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  Eckert IV Nell-Hammer modified
Creator Max Eckert-Greifendorff (1906) H.H. Ernst von Hammer, Karlheinz Wagner (1949)
Group Pseudocylindric Pseudocylindric
Property Equal-area Equal-area
Other Names
Remarks The original Nell-Hammer (1900) was derived from the Nell projection. This modified version was introduced in 1949 by Karlheinz Wagner and allows to set arbitrary standard parallels. The image shows the modified Nell-Hammer with standard parallels at ≈ 42°12′ N/S, which were chosen by Wagner to offer a closely matching alternative to Eckert IV which can be calculated using a considerably easier formula.

(The exact value that I used for the standard parallels is 42°12′49.284″ – not that it really matters…)
recommended comparisons Equal Earth
Hufnagel 10
Hufnagel 9
Natural Earth II
Nell-Hammer modified
Wagner IV
Eckert IV
This pairing is among the list of recommended pairings – but why?
Modified Nell-Hammer is intended to be an easier to calculate alternative to Eckert IV.

1. Comparison: Physical Map

Eckert IV
Eckert IV
Nell-Hammer modified
Nell-Hammer modified

2. Comparison: Political Map

Eckert IV
Eckert IV
Nell-Hammer modified
Nell-Hammer modified

3. Comparison: Silhouette Map

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Grey areas: Superimposition of projections
Eckert IV Silhouette Map
Nell-Hammer modified Silhouette Map

4. Comparison: Tissot Indicatrix, 30°

Eckert IV
Eckert IV Tissot Indicatrix
Nell-Hammer modified
Nell-Hammer modified Tissot Indicatrix

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