Mapthematics Forums

Tobias, Thanks for the confirmation. I recently acquired an Apple Silicon laptop, so, if I get the desire, I can test things out more thoroughly. I haven’t seen any trouble running in emulation mode that doesn’t also exist in the newest versions of macOS on Intel hardware, so I conclude that the em...

Allow me to chime in here. Geocart is one of the few small developer-owed apps the Apple hasn't driven out of existence and I love to use it knowing that there actually IS someone behind it that has my back. I use Geocart on a daily basis on a M2 Mac running Ventura and don't know how long it will ...

Do you konw if Geocart is compatible to Windows 11 on Arm? I’m asking because you need this in order to run Windows with the help of Parallels Desktop on a Mac. Eek. I missed this posting. Sorry about that. I do not know the answer to this. Historically I have used VMWare Fusion, but I haven’t trie...

If you ever wanted confirmation of how inflexible the typical person’s thinking is, show them a south-up map. It’s puzzling to how exotic this seems to a lot of people. The responses on the Service Formerly Known As Twitter can only be described as a meltdown, according to reports. (I don’t patroni...

That’s a thing of beauty! Bravo!

— daan

Happy new year to you, too!

I wish I had something to tell you. I don’t — nothing anyone could act on, anyway. I seem to believe I will adapt the code base to Metal, but I have not started and have no idea how long it will take.

— daan

Ah, right. Sorry; I should have confirmed your conjecture about the usual definition for angular deformation. And yes, using the Jacobian is a pithy path to the solution. Nice to see that explicitly. You might be surprised how uncommon it is in the map projection literature to see the Jacobian used ...

I didn't turn these into angle distortion values because I don't know the typical definition of angle distortion. For angular deformation 𝜔, it is common to use 50 𝜔 = 2 arcsin(𝑏′/𝑎′) where 50 𝑎′ = √( h ² + 𝑘² + 2 h 𝑘 sin 𝜃′) 50 𝑏′ = √( h ² + 𝑘² − 2 h 𝑘 sin 𝜃′) 50 h = √(( ∂ 𝑥/ ∂ 𝜑)² + ( ∂ 𝑦/ ∂ 𝜑)²)...

Welcome to the forums, saga. That’s an interesting inaugural posting. It looks like you’ve put a lot of work into this. I like the Liquid Earth; I could see it being used for maps whose spatial relationships among continents is unimportant. It does a good job of preserving continental shapes on a (n...

Many of the 16th century projections were ad hoc. I don’t know if that exact one shows up in other contexts. I can speculate on what influenced its design, but I don’t know of any description for its construction.

— daan