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Eckert IV vs. Nell-Hammer modified

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Projections markes with asterisks [*] lack silhouette and Tissot maps.
Marked with hash [#]: Additional image of projection (useful for certain comparisions).

  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 (1990) 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 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.
Remark: On these two projections, »scaled to fit« and »scaled to same width« will be quite identical!

1. Comparison: Physical Map – scaled to fit

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

2. Comparison: Silhouette Map – scaled to fit

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

3. Comparison: Tissot Indicatrix, 30° – scaled to fit

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

4. Comparison: Physical Map – scaled to same width

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

5. Comparison: Silhouette Map – scaled to same width

Click on projection’s name to hide it
Grey areas: Superimposition of projections
Eckert IV Silhouette Map
Nell-Hammer modified Silhouette Map

6. Comparison: Tissot Indicatrix, 30° – scaled to same width

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

7. Comparison: Tissot Indicatrix, 15° – scaled to fit

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

8. Comparison: Tissot Indicatrix, 15° – scaled to same width

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

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