Search found 134 matches

by meynaf
Sat Oct 23, 2021 6:26 pm
Forum: Gameplay
Topic: maps with different projection ?
Replies: 70
Views: 2230

Re: maps with different projection ?

^ That's as close as I can get to not having land on the sides... And it looks like it is missing a little bit of Alaska and Russia at the curves. If something's missing, i can't use it. :( I added a link at the bottom of my last post to more projection images of your map. More and more thoughts ab...
by meynaf
Sat Oct 23, 2021 5:41 pm
Forum: Gameplay
Topic: maps with different projection ?
Replies: 70
Views: 2230

Re: maps with different projection ?

^ Regarding the consistency of data sets, or lack thereof... I only picked GlobCover 2009 because it was the smallest file size of the GlobCover data sets. If the methodology is the same between satellite photo based data sets, then I would expect them to improve over time, yet the more recent 2015...
by meynaf
Sat Oct 23, 2021 4:23 pm
Forum: Gameplay
Topic: maps with different projection ?
Replies: 70
Views: 2230

Re: maps with different projection ?

I had assumed , because the "Land Cover of Africa" image and GuulagMaps both have it wrong, that the error was in the GlobCover 2009 land cover data but I get your point -- it isn't. Which strikes me as odd because the more recent 2015 Africa land cover data used for that image does have ...
by meynaf
Sat Oct 23, 2021 8:38 am
Forum: Gameplay
Topic: maps with different projection ?
Replies: 70
Views: 2230

Re: maps with different projection ?

^ I don't think that's right. It is the land cover data (GlobCover 2009) that has it wrong - it should not have been classed as anything but desert. What's not correct ? The land cover data i'm using gives desert there, really. The bathymetric data is correct despite that it doesn't translate into ...
by meynaf
Fri Oct 22, 2021 5:26 pm
Forum: Gameplay
Topic: maps with different projection ?
Replies: 70
Views: 2230

Re: maps with different projection ?

^ Yeah, but so far none of the continents are missing! :) Best method might be to first simplify the land cover classes to a minimal set that translates well to Freeciv. Too much ambiguity among the classes, coupled with the increasing degree of uncertainty, is maddening. None of the continents mis...
by meynaf
Fri Oct 22, 2021 6:04 am
Forum: Gameplay
Topic: maps with different projection ?
Replies: 70
Views: 2230

Re: maps with different projection ?

Sure, but there are potentially much larger errors than this one.
by meynaf
Thu Oct 21, 2021 5:32 pm
Forum: Gameplay
Topic: maps with different projection ?
Replies: 70
Views: 2230

Re: maps with different projection ?

What's the alternative??? Some of the newer data sets have 9 meter resolution per pixel which -ought- to improve accuracy, but the data sets are also HUGE because of the level of detail. If i had valid alternatives, i would be already using them ;) I don't think accuracy is gonna be better with inc...
by meynaf
Thu Oct 21, 2021 8:31 am
Forum: Gameplay
Topic: maps with different projection ?
Replies: 70
Views: 2230

Re: maps with different projection ?

^ Yes, it certainly does appear to be desert, but somehow it appears to have been misclassified in the "Land Cover of Africa" image as "flooded vegetation". My confidence in the accuracy of land cover data just dropped significantly. How many other areas are grossly misclassifie...
by meynaf
Wed Oct 20, 2021 8:40 am
Forum: Gameplay
Topic: maps with different projection ?
Replies: 70
Views: 2230

Re: maps with different projection ?

That appears to settle it. It is land below sea level and should be considered as ordinary land (for our gaming purposes). If depth is ignored (land always dominates) then this area indeed becomes desert. As altitude isn't handled in civ (at least not for desert areas), this land feature will disapp...
by meynaf
Tue Oct 19, 2021 6:03 pm
Forum: Gameplay
Topic: maps with different projection ?
Replies: 70
Views: 2230

Re: maps with different projection ?

How do they know that it is valid depth data if they don't know where the values originated??? Perhaps they know something was invalid when receiving error reports ? Maybe it would be better to use the current 2021 data set and see if the problem still exists in that newer data? https://www.gebco.n...