Added rate to the LineDatation interface.

src/main/java/org/orekit/rugged/api/LineDatation.java

@@ -36,4 +36,10 @@ public interface LineDatation {
      */
     double getLine(AbsoluteDate date);
 
+    /** Get the rate of lines scanning.
+     * @param lineNumber line number
+     * @return rate of lines scanning (lines / seconds)
+     */
+    double getRate(double lineNumber);
+
 }

src/main/java/org/orekit/rugged/api/LineSensor.java

@@ -214,6 +214,14 @@ public class LineSensor {
         return datationModel.getLine(date);
     }
 
+    /** Get the rate of lines scanning.
+     * @param lineNumber line number
+     * @return rate of lines scanning (lines / seconds)
+     */
+    public double getRate(final double lineNumber) {
+        return datationModel.getRate(lineNumber);
+    }
+
     /** Get the mean plane normal.
      * <p>
      * The normal is oriented such traversing pixels in increasing indices

src/main/java/org/orekit/rugged/api/LinearLineDatation.java

@@ -60,4 +60,10 @@ public class LinearLineDatation implements LineDatation {
         return referenceLine + rate * date.durationFrom(referenceDate);
     }
 
+    /** {@inheritDoc} */
+    @Override
+    public double getRate(final double lineNumber) {
+        return rate;
+    }
+
 }