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Eckert-Greifendorff vs. Quartic Authalic

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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-Greifendorff Quartic Authalic
Creator Max Eckert-Greifendorff (1935) Karl Siemon (1937)
Group Lenticular Pseudocylindric
Property Equal-area Equal-area
Other Names
  • Adams Orthembadic
Remarks Independently presented by Oscar Sherman Adams (1945).
recommended comparisons Quartic Authalic
Sinusoidal
Eckert-Greifendorff
Sinusoidal
This pairing is among the list of recommended pairings – but why?
These two projections nearly identical, so you might spot the differences in direct comparision only.
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-Greifendorff
Eckert-Greifendorff Projection
Quartic Authalic
Quartic Authalic Projection

2. Comparison: Silhouette Map – scaled to fit

Click on projection’s name to hide it
Grey areas: Superimposition of projections
Eckert-Greifendorff Silhouette Map
Quartic Authalic Silhouette Map

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

Eckert-Greifendorff
Eckert-Greifendorff Tissot Indicatrix
Quartic Authalic
Quartic Authalic Tissot Indicatrix

4. Comparison: Physical Map – scaled to same width

Eckert-Greifendorff
Eckert-Greifendorff Projection
Quartic Authalic
Quartic Authalic Projection

5. Comparison: Silhouette Map – scaled to same width

Click on projection’s name to hide it
Grey areas: Superimposition of projections
Eckert-Greifendorff Silhouette Map
Quartic Authalic Silhouette Map

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

Eckert-Greifendorff
Eckert-Greifendorff Tissot Indicatrix
Quartic Authalic
Quartic Authalic Tissot Indicatrix

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

Eckert-Greifendorff
Eckert-Greifendorff Tissot Indicatrix
Quartic Authalic
Quartic Authalic Tissot Indicatrix

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

Eckert-Greifendorff
Eckert-Greifendorff Tissot Indicatrix
Quartic Authalic
Quartic Authalic Tissot Indicatrix
 

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