fixed #57 - Land flag follows different definition if SRTM option is enabled or disabled

(cherry picked from commit b8afd1b)

Author: marpet

idepix-olci/src/main/java/org/esa/snap/idepix/olci/IdepixOlciClassificationOp.java

@@ -402,7 +402,9 @@ private void classifyOverLand(Tile[] olciReflectanceTiles,
 
     private boolean isOlciLandPixel(int x, int y, Tile olciL1bFlagTile, int waterFraction) {
         if (waterFraction < 0) {
-            return olciL1bFlagTile.getSampleBit(x, y, IdepixOlciConstants.L1_F_LAND);
+            boolean landFlag = olciL1bFlagTile.getSampleBit(x, y, IdepixOlciConstants.L1_F_LAND);
+            boolean inlandWaterFlag = olciL1bFlagTile.getSampleBit(x, y, IdepixOlciConstants.L1_F_FRESH_INLAND_WATER);
+            return landFlag && !inlandWaterFlag;
         } else {
             // the water mask ends at 59 Degree south, stop earlier to avoid artefacts
             if (IdepixUtils.getGeoPos(l1bProduct.getSceneGeoCoding(), x, y).lat > -58f) {