Bugfix: Eq. 37

tree-water-demand/src/main/java/de/hft/stuttgart/water/TreeWaterDemand.java

@@ -206,7 +206,7 @@ public class TreeWaterDemand {
 			double extraterrestrialRadiation){
 		// divide by 24 for hourly
 		double sigma = 4.903E-9 / 24;
-		double rso = (0.75 + 2 * 10E-5 * altitude) * extraterrestrialRadiation;
+		double rso = (0.75 + 2E-5 * altitude) * extraterrestrialRadiation;
 		double rsRsoQuotient = 0.5;
 		if (rso != 0) {
 			rsRsoQuotient = rs / rso;
@@ -219,6 +219,7 @@ public class TreeWaterDemand {
 	}
 
 	// ExtraterrestrialRadiation
+	// unit is apparently [MJ / (m².h)]
 	private static double ra(int dayOfYear, double hourOfDay, double lz, double lm, double latitude) {
 		double dr = 1 + 0.033 * Math.cos(2 * Math.PI * dayOfYear / 365d);
 		double b = (2 * Math.PI * (dayOfYear - 81)) / 364;