Index: trunk/GnssCenter/monitor/thriftclient.cpp
===================================================================
--- trunk/GnssCenter/monitor/thriftclient.cpp	(revision 5497)
+++ trunk/GnssCenter/monitor/thriftclient.cpp	(revision 5498)
@@ -145,5 +145,8 @@
       const SatelliteEleAzi& sat = staRes.svPosList[is];
       string prn = id2prn(sat.constellation, sat.ID);
-      res->_prns.push_back(prn);
+      const double eleMask = 10.0;
+      if (sat.elevation > eleMask) {
+        res->_prns.push_back(prn);
+      }
     }