compensated table height

src/main/java/com/elphel/imagej/ims/UasLogReader.java

@@ -24,7 +24,7 @@ public class UasLogReader {
 
 	UasLogRecord[] rec_arr;
 	double         start_timestamp;
-	double         uas_home_alt = 0; // relative to the camera
+	double         uas_home_alt = -1.2; // relative to the camera, table + mount height
 	double []      camera_lla = CAMERA_LLA.clone();
 	double []      camera_ATR = new double[3];
 	QuadCLT        parentCLT = null; // for geometic parameters