LargeDiameterBomb
Posts: 80
Joined: 3/3/2019
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About the caching of map data:
Some maps do not work as designed for the moment and speeds are often slow but i have noticed much better speeds recently.
There are five new map types which make up the a little more than half the terabyte of data that can be cached. Map types are divided into map layers with progressively higher resolution as the camera height decreases, ie as you zoom in. There are reportedly, according to an administrator as many as 13 map layers, although I am not sure if that goes for all the new map types, I am fairly certain that one of them does not include that many layers or at least holds very little data in all but the three to five most high resolution layers.
One map type is as currently not loading something like the five lowest layers (The land cover map which shows which type of terrain covers the earth) and one type will not load one or two of the lowest layers (The Relief layer map, the one present in CMANO that shows height differences very well). All other maps seem to load correctly although slow sometimes.
There are also rendering problems with the Stamen - terrain and Stamen - Road + Cities maps at lower layers. However, I have noticed that zooming in to 10 m camera height where the map disappears and then zooming out til the camera height you were at solves these rendering problems until they appear again.
Now,
I have purposely downloaded all available map data for approx 75 % of the area of the countries to the west of the Baltic sea (Sweden, Denmark, Norway) plus Nigeria, the coastal parts of present day Germany and about 50 percent of the Baltic states and coastal areas of Poland - for all the map layers available.
I have also downloaded approximately the seven uppermost layers of four maps for most of Europe and the four uppermost layers for all map types for the above mentioned areas plus most parts of the eastern hemispere ((Excluding Australia and Polynesia) and some parts of the western hemisphere and my Map cache folder size was around 30 Gb last i checked. Also there are some other places where I have downloaded all maps available down to the third or second last layer, such as the alps, parts of Spain and Morocco and Cuba and some other quite small, localized places.
Remember that scenarios that are played mostly over water will require very little additional data than what's already installed with the game since the base map that's there in CMANO is included with the install in CMO as well
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I would guesstimate that the average player will find himself with a cache that is 100 to a maximum of 250 Gb of data after playing the game for many years, in the lesser range if one predominantly plays scenarios taking place mostly over sea and the upper range if you play many scenarios where you frequently zoom in to a very low map height (below approx 15000 meters for large parts of the area your scenario is taking place in for almost all map types).
Also, a reasonable assumption is that much map data will not be downloaded ever by many or even most or possibly almost all people - Think the lower layers (Which of course makes up the bulk of the data) of the inner parts of the following continents/countries/places: Northern America, Australia, Antarctica, the former USSR, Western China, Greenland, Much of Africa and so on. If people will download to the lowest layer there it will be highly localized and not take up much space. That is much of the earth's surface.
So that is my guesstimate as to how much cache will be needed.
Also, you can delete your whole map cache or parts of it at will, though you would only know what map type you are deleting and not specifically what parts of the map you are deleting due to the library structure of the cache.
And last, apparently the devs are also at least somewhat considering compressing the map data into a format that would make it something of the order of 75 % smaller.
Hope this helps.
< Message edited by LargeDiameterBomb -- 12/7/2019 6:46:05 PM >
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On the fence about upgrade, some questions. - 
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