Mapthematics Forums

A friend of mine dragged me to the Reuse Centre in Edmonton, where I picked up a few free items as she picked up several for use in her craft activities. Among them were three issues of the National Geographic magazine. One of them was the one with a holographic cover that happened to be the one whe...

My drawing of the projection was at the bottom of my page on the Gall Stereographic, but there was a bug in the program, stretching it horizontally.
I have now corrected the bug so that I and everyone else can see correctly how it looks.

Recently, I added the BSAM projection to my page about the Gall Stereographic projection. I noted that its reduced stretch was less objectionable. It led me to thinking that another way to have less stretch but still have 40 degrees as the standard parallel, would be to start with a projection close...

I have had very good luck recently in finding things that I wanted to include on my pages about map projections, but was not previously able to. EDIT: Just now, I've edited three pages on my site, after finding the April, 1929 issue of the Monthly Weather Review on the Internet Archive. My page on t...

I found the map I was looking for.
In an atlas from 1896. Alex Everett Frye is the individual responsible, and this map appeared in several books from Ginn and Company. I found it in his Home and School Atlas; he made more extensive use of it in his Elements of Geography.

I've found Fawcett's paper online now. And it pointed me to where I need to look for the original idea of a projection on this aspect. It turns out the inspiration for his first map came from a book published in 1902! Specifically, "Britain and the British Seas", by H. J. Mackinder, he of ...

Recently, I was searching for information about Goode's Polar Equal-Area Projection, or perhaps another similar projection, and I came across a familiar image. It was described as a very early advanced interrupted map. I think it was credited to a cartographer named Farr. I had remembered the image,...

The new projections in version 3.x (or 2.x later than 2.5, which is what I have) seem to be fairly obscure ones, not anything that I'm interested in. If they added Eisenlohr, or better polyhedral projections, or the ability to make oblique aspects of arbitrary projections instead of only a small ha...

I refused to upgrade past version 2.x because changing the map controls to floating windows instead of part of the same window as the map seemed like a downgrade to me that would only make it harder to keep track of where my controls have run off to or which controls link to which map. I already of...

An example of a minimum-error perspective azimuthal projection was Clarke's Twilight projection. G.Projector - and, I believe, Geocart - uses the formulas given in Snyder for it, and Snyder went back to original sources. However, in an article on map projections in the Encyclopedia Britannica - whic...