started working on temperature range corrections

src/map_nextgen.lua

@@ -126,7 +126,7 @@ local generate = function()
     octaves = 7, lacunarity = 2, gain = 0.5,
   }
   map.temperature = simplex_map.generate{   -- in celsius
-    size = map.size, scale = 0.005, min = 0, max = 1, -- min = -89.2, max = 56.7,
+    size = map.size, scale = 0.005, min = -89.2, max = 56.7,
     octaves = 1, lacunarity = 2, gain = 0.5,
   }
   map.rainfall = simplex_map.generate{   -- in millimeters of rainfall
@@ -173,6 +173,11 @@ local generate = function()
             end
           end
         end
+      else
+        -- clear non-planet zones
+        map.altitude[x][y] = nil
+        map.temperature[x][y] = nil
+        map.rainfall[x][y] = nil
       end
     end
   end