Search found 139 matches

by meynaf
Fri Oct 22, 2021 6:04 am
Forum: Gameplay
Topic: maps with different projection ?
Replies: 80
Views: 3400

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: 80
Views: 3400

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: 80
Views: 3400

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: 80
Views: 3400

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: 80
Views: 3400

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...
by meynaf
Tue Oct 19, 2021 7:08 am
Forum: Gameplay
Topic: maps with different projection ?
Replies: 80
Views: 3400

Re: maps with different projection ?

The page at your link says that the image was created with data from "the General Bathymetric Chart of the Oceans (GEBCO) produced by the British Oceanographic Data Centre" but the NASA page doesn't give any details about which GEBCO data set(s) were used, other than mentioning that the i...
by meynaf
Mon Oct 18, 2021 6:28 pm
Forum: Gameplay
Topic: maps with different projection ?
Replies: 80
Views: 3400

Re: maps with different projection ?

Ahh, that makes more sense. Where did you get the depth values? I mean, what is the data source? Maybe there is some documentation at the site which wasn't included with the image file? This is simple bathymetry. Nothing special, just one-byte levels. I linked to it in a previous post : http://foru...
by meynaf
Mon Oct 18, 2021 5:26 pm
Forum: Gameplay
Topic: maps with different projection ?
Replies: 80
Views: 3400

Re: maps with different projection ?

But land with other value, what does it mean ? There are few pixels, but there are some. I used a distinct color to see them, but it's not a terrain type. The only "other" values I can find in the pbm file are the four text lines of header info at the beginning of the file. 00000000 50 35...
by meynaf
Mon Oct 18, 2021 8:03 am
Forum: Gameplay
Topic: maps with different projection ?
Replies: 80
Views: 3400

Re: maps with different projection ?

Yes, you're right. I gave you a GeoPBM not a GeoTiff, but aside from file formatting it would be the same with an uncompressed tiff. Sure, but the GeoTiff files i've seen weren't uncompressed ;) ^ Right, if we try to indicate both elevation and land cover, one over-rides the other on at least some ...
by meynaf
Sat Oct 16, 2021 5:40 pm
Forum: Gameplay
Topic: maps with different projection ?
Replies: 80
Views: 3400

Re: maps with different projection ?

^ You already have! I think that I may have contributed to some confusion about that. When I first started looking for a way to do a live lookup of land classification for a given spot on Earth via coordinates, I immediately found Google Earth Pro, which I posted an image of several posts back in t...