Talk:Hammer projection

Replace low-contrast images

I will be replacing images on the various map projection pages. Presently many are on a satellite composite image from NASA that, while realistic, poorly demonstrates the projections because of dark color and low contrast. I have created a stylization of the same data with much brighter water areas and a light graticule to contrast. See the thumbnail of the example from another article. Some images on some pages are acceptable but differ stylistically from most articles; I will replace these also.

The images will be high resolution and antialiased, with 15° graticules for world projections, red, translucent equator, red tropics, and blue polar circles.

Please discuss agreement or objections over here (not this page). I intend to start these replacements on 13 August. Thank you. Strebe (talk) 22:41, 6 August 2011 (UTC)

File:Hammer projection SW.jpg to appear as POTD soon

Hello! This is a note to let the editors of this article know that File:Hammer projection SW.jpg will be appearing as picture of the day on June 6, 2016. You can view and edit the POTD blurb at Template:POTD/2016-06-06. If this article needs any attention or maintenance, it would be preferable if that could be done before its appearance on the Main Page. — Chris Woodrich (talk) 00:57, 21 May 2016 (UTC)

Picture of the day

The Hammer projection is a map projection described by Ernst Hammer in 1892. It uses the same 2:1 elliptical outer shape as the Mollweide projection. Both projections are equal-area, but by depicting parallels of latitude as curved lines rather than straight, Hammer reduced distortion toward the outer limbs, where it is extreme in the Mollweide.Map: Strebe, using Geocart

You always do such a fine job on these, Chris Woodrich! A slight copy edit, and now I'm done. Thanks. Strebe (talk) 03:13, 23 May 2016 (UTC)

John Bartholomew

This page notes that Bartholomew's Nordic Projection was devised by John Bartholomew.

The name, however, is not crossreferenced to one of the wiki articles on the members of the Bartholomew family. So was it devised by John Ian Bartholomew (1890-1962), or perhaps by his son John Christopher Bartholomew (1923-2008)? The sources I can find online tend to just say it was designed by Bartholomew or John Bartholomew. I did find one source which notes that these projections were described by their inventor at a meeting of the Royal Society of Edinburgh prior to January 11, 1949, which would seem to point in the direction of the more senior Bartholomew, but surely somewhere their inventor is identified with more certainty. Quadibloc (talk) 02:13, 14 August 2019 (UTC)

@Quadibloc: John Snyder (Flattening the Earth: 2000 Years of Map Projections, 1993, p. 238) identifies John Bartholomew as the author of the projection appearing in the 1950 The Advanced Atlas of Modern Geography, with a further citation by John C. Bartholomew in the 1982 World Atlas. The implication is that the 1950 citation was John Senior, since John Junior is cited separately. Strebe (talk) 02:52, 14 August 2019 (UTC)

Thank you. I have since definitively confirmed that the designer of the Atlantis projection was John Ian Bartholomew, as the 1957 edition of the Times Atlas of the World, where it uses that projection, while it merely names John Bartholomew as its originator, also mentions his honorary law degree, which was an honor awarded to John Ian Bartholomew specifically. Quadibloc (talk) 03:41, 14 August 2019 (UTC)