Search found 403 matches

by RogerOwens
Wed Oct 09, 2019 7:34 am
Forum: Map projections
Topic: Quantitative evaluation & comparison of world-maps
Replies: 131
Views: 1958

Re: Quantitative evaluation & comparison of world-maps

I'm unsubscribing from this forum because I have no use for a forum whose administrator abuses the forum by namecalling and "winning" arguments that he starts, by deletion of replies.

Michael Ossipoff
42 W
October 9th
1434 UTC
by RogerOwens
Wed Oct 09, 2019 7:26 am
Forum: Map projections
Topic: Quantitative evaluation & comparison of world-maps
Replies: 131
Views: 1958

Re: Quantitative evaluation & comparison of world-maps

that paywall wasn't where a Google search led me.
Then I'll try more Google searches.

Michael Ossipoff
42 W
October 9th
1426 UTC
by RogerOwens
Tue Oct 08, 2019 4:33 pm
Forum: Map projections
Topic: Quantitative evaluation & comparison of world-maps
Replies: 131
Views: 1958

Re: Quantitative evaluation & comparison of world-maps

If it doesn't matter what Ossipoff said or meant, then daan should have thought of that before he said that what Ossipoff said was wrong. . No, skewness and flexion are NOT G&G's comparison-scheme. That's because a single metric, or a pair of them, is not someone's comparison-scheme unless that some...
by RogerOwens
Tue Oct 08, 2019 2:07 pm
Forum: Map projections
Topic: Quantitative evaluation & comparison of world-maps
Replies: 131
Views: 1958

Re: Quantitative evaluation & comparison of world-maps

No, it was about schemes for comparing or rating map-projections. G&G did so as I described. Skewness and flexion were only part of the method by which G&G rated map-projections. (...even if they didn't invent or own all of the map-rating technique that they used.) Michael Ossipoff 42 Tu October 8th...
by RogerOwens
Tue Oct 08, 2019 1:27 pm
Forum: Map projections
Topic: Quantitative evaluation & comparison of world-maps
Replies: 131
Views: 1958

Re: Quantitative evaluation & comparison of world-maps

" Their comparison-scheme " meant " the comparison-scheme by which they rated world map-projections ". I neither spoke of nor claimed to know that scheme's history, ownership or origin. "My town is Tulsa" doesn't meant that I own Tulsa. "My ruler is Idi Amin" doesn't mean that I own Idi Amin. "Fido'...
by RogerOwens
Mon Oct 07, 2019 3:42 pm
Forum: Map projections
Topic: Quantitative evaluation & comparison of world-maps
Replies: 131
Views: 1958

Re: Quantitative evaluation & comparison of world-maps

I didn't say that G&G invented or promoted RMS or weighted-aggregation of different metrics (or any particular such weighting). I said they used those things. And they did use those things.

Michael Ossipoff
42 M
October 7th
2241 UTC
by RogerOwens
Mon Oct 07, 2019 11:50 am
Forum: Map projections
Topic: Quantitative evaluation & comparison of world-maps
Replies: 131
Views: 1958

Re: Quantitative evaluation & comparison of world-maps

Daan seems to be claiming that G&G didn't use RMS to globally-aggregate even any one of their various metrics, and that they didn't combine those separate metric-aggregations into one number via weighting. That's surprising, and seems to contradict the G&G paper. The G&G articles that I've looked at...
by RogerOwens
Mon Oct 07, 2019 7:44 am
Forum: Map projections
Topic: Quantitative evaluation & comparison of world-maps
Replies: 131
Views: 1958

Re: Quantitative evaluation & comparison of world-maps

As I've been saying, attempts to combine several different metrics into one rating-number don't interest me at all.

Michael Ossipoff
42 M
October 7th
1443 UTC
by RogerOwens
Mon Oct 07, 2019 7:39 am
Forum: Map projections
Topic: Quantitative evaluation & comparison of world-maps
Replies: 131
Views: 1958

Re: Quantitative evaluation & comparison of world-maps

The Goldberg-Gott metrics are flexion and skew. Those measures don’t aggregate, weight, bring in “various ‘comparison quantities’” and they don’t combine them into a single metric. They integrate flexion and skew each independently across the entire map, but not by RMS, not by weighting, not by “ag...
by RogerOwens
Mon Oct 07, 2019 7:29 am
Forum: Map projections
Topic: Quantitative evaluation & comparison of world-maps
Replies: 131
Views: 1958

Re: Quantitative evaluation & comparison of world-maps

i once found a complete description of how Gott & Goldberg actually rate maps, but I'm not finding it in current searches. Their paper "Flexion and Skewness in Map Projections of the Earth" contains this description, and it is still online. In an article of theirs, I clicked on "our paper", and rec...