Changed naming in CloudLayer, added Sky Obscured

Renamed ENUMS to LEVEL0-8, added LEVEL_SKY_OBSCURED for situations where the sky is not perceivable, Visual Reference in the comments added

Signed-off-by: Markus Waldmann <Markus.Waldmann@stud.hs-kempten.de>

Author: Markus Waldmann

osi_environment.proto

@@ -346,10 +346,12 @@ message EnvironmentalConditions
     {
         // Definition of the cloud state level, i.e. cloud state and sky visualization settings.
         //
-        optional CloudStateLevel cloud_state_level = 1;
+        optional CloudLayerLevel cloud_layer_level = 1;
 
         // Defines the cloud state levels given by observation of total cloud amount in oktas.
         //
+        // For visual alignment please call the reference[1]
+        //
         // The total degree of coverage indicates how large the part of the sky vault is which is covered
         // with clouds altogether. It is given in eighths, because this division is easier to estimate
         // for the observer. 0 eighths means that there are no traces of clouds in the sky,
@@ -364,58 +366,63 @@ message EnvironmentalConditions
         // With a little practice, the observer can easily determine the total amount of cloud cover.
         // Problems occur only with scattered clouds or many single clouds (cumulus).
         // Their cloud cover is often overestimated. On the other hand,
-        // the coverage of thin ice clouds (cirrus) is often underestimated [3].
+        // the coverage of thin ice clouds (cirrus) is often underestimated [2].
         //
         // \par References:
-        // [1] ISO 15469:2004(E) / CIE S 011/E:2003 : Spatial distribution of skylight
-        // [2] https://en.wikipedia.org/wiki/Cloud_cover
-        // [3] https://www.dwd.de/DE/service/lexikon/Functions/glossar.html?lv2=100932&lv3=101016
+        // ISO 15469:2004(E) / CIE S 011/E:2003 : Spatial distribution of skylight
+        // https://en.wikipedia.org/wiki/Cloud_cover
+        // [1] https://www.eoas.ubc.ca/courses/atsc113/flying/met_concepts/01-met_concepts/01c-cloud_coverage/index.html
+        // [2] https://www.dwd.de/DE/service/lexikon/Functions/glossar.html?lv2=100932&lv3=101016
         //
-        enum CloudStateLevel
+        enum CloudLayerLevel
         {
             // Cloud State is unknown (must not be used in ground truth).
             //
-            CLOUD_STATE_LEVEL_UNKNOWN = 0;
+            CLOUD_LAYER_LEVEL_UNKNOWN = 0;
 
             // Other (unspecified but known) CloudState.
             //
-            CLOUD_STATE_LEVEL_OTHER = 1;
+            CLOUD_LAYER_LEVEL_OTHER = 1;
 
             // Cloudless (0/8)
             //
-            CLOUD_STATE_LEVEL_CLOUDLESS = 2;
+            CLOUD_LAYER_LEVEL_0 = 2;
 
             // Sunny (1/8)
             //
-            CLOUD_STATE_LEVEL_SUNNY = 3;
+            CLOUD_LAYER_LEVEL_1 = 3;
 
             // Serene (2/8))
             //
-            CLOUD_STATE_LEVEL_SERENE = 4;
+            CLOUD_LAYER_LEVEL_2 = 4;
 
             // Slightly Cloudy (3/8)
             //
-            CLOUD_STATE_LEVEL_SLIGHTLY_CLOUDY = 5;
+            CLOUD_LAYER_LEVEL_3 = 5;
 
             // Light Cloudy (4/8)
             //
-            CLOUD_STATE_LEVEL_LIGHT_CLOUDY = 6;
+            CLOUD_LAYER_LEVEL_4 = 6;
 
             // Cloudy (5/8)
             //
-            CLOUD_STATE_LEVEL_CLOUDY = 7;
+            CLOUD_LAYER_LEVEL_5 = 7;
 
             // Heavy Cloudy (6/8)
             //
-            CLOUD_STATE_LEVEL_HEAVY_CLOUDY = 8;
+            CLOUD_LAYER_LEVEL_6 = 8;
 
             // Almost Covered (7/8)
             //
-            CLOUD_STATE_LEVEL_ALMOST_COVERED = 9;
+            CLOUD_LAYER_LEVEL_7 = 9;
 
             // Covered (8/8)
             //
-            CLOUD_STATE_LEVEL_COVERED = 10;
+            CLOUD_LAYER_LEVEL_8 = 10;
+
+            // Sky obscured, describes situations where the sky is not perceivable.
+            //
+            CLOUD_LAYER_LEVEL_SKY_OBSCURED = 11;
         }
     }