avaEiskar: Update README.md with expanded details on dataset desc…

avaEiskar/README.md

@@ -29,21 +29,25 @@ Initial commit with original file names
 - Entrainment: Significant for avalanche formation
 - Date: 15.01.2019 
 - Be aware: the release file has two release areas ESK1 and ESK2. Relevant for the runout at the bottom is 
-  only ESK1 (reasoning see report pdff in this repository; German only)
+  only ESK1 (reasoning see report pdf in this repository; German only)
 - Drone scan data from a flight on 18.01.2019 is available too, and will be published in future.  
+- Release thickness and outline is based on this drone laser scan. 
 
 ### Available data
 
-| File | Geometry | Description |
-|---|---|---|
-| `depositionEvent20190115.gpkg` | LineString | Deposition outline of the event |
-| `releaseEvent20190115.gpkg` | 3D Polygon | Release areas ESK1 and ESK2 (drone-derived) |
-| `entrainmentEvent20190115.gpkg` | Polygon | Entrainment areas (smoothed) |
-| `resistanceEvent20190115.gpkg` | Polygon | Resistance areas (smoothed) |
-| `depositionDFAOutlineEvent20190115.gpkg` | Polygon | Dense flow avalanche deposition outline |
-| `depositionPSAOutlineEvent20190115.gpkg` | Polygon | Powder snow avalanche deposition outline |
-| `depositionMaxOutlineEvent20190115.gpkg` | Polygon | Maximum deposition outline (DFA + PSA combined) |
-
+| File | Geometry | Description                                                                                                                                               |
+|---|---|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `depositionEvent20190115.gpkg` | LineString | Deposition outline of the event. Based on where effects <br/>could be seen either on the orthofoto or local observations                                  |
+| `releaseEvent20190115.gpkg` | 3D Polygon | Release areas ESK1 and ESK2 (drone-derived)                                                                                                               |
+| `entrainmentEvent20190115.gpkg` | Polygon | Entrainment areas (smoothed)                                                                                                                              |
+| `resistanceEvent20190115.gpkg` | Polygon | Resistance areas (smoothed)                                                                                                                               |
+| `depositionDFAOutlineEvent20190115.gpkg` | Polygon | Dense flow avalanche deposition outline; derived from laser scan data  <br/>                                                                              |
+| `depositionPSAOutlineEvent20190115.gpkg` | Polygon | Powder snow avalanche deposition outline; derived from laser scan data; i.e. where <br/>considerable amounts of deposition can be extracted from the data |
+| `depositionMaxOutlineEvent20190115.gpkg` | Polygon | Maximum deposition outline (DFA + PSA combined); derived from laser scan data                                                                             |
+
+Note: the difference between `depositionEvent` and `depositionMaxOutlineEvent` is the derivation of it. The 
+`depositionEvent` is based purely on (visual) observations (orthophoto and local), while `depositionMaxOutlineEvent` 
+is based on laser scan data, i.e. where considerable deposition masses can be shown. 
 
 ### Data source