GPS has become an important tool both in navigation and in precise point positioning. One of the nuicance parameters limiting the accuracy of point determination is the water vapor content of the troposphere. On the other hand meteorologists are interested in the wet component of the troposphere as a valuable tool for Numerical Weather Prediction. Therefore GPS offers a low cost monitoring of water vapor with high temporal resolution. We make use of continuous measurements of the GPS/GLONASS reference station network in Austria, which currently consists of about 30 sites with distances ranging from 50 km to 120 km. We calculate the zenith wet delays for a period of 2 months (February and March 2002). Subsequently the results are compared to contributions of different processing centers of the COST-716 project ?Exploitation of Ground Based GPS for Climate and NWP? and with zenith path delay estimates provided by the IGS. As meteorologists need the water vapor within less than two hours, special attention is paid to the availability, reliability and especially to the quality of the satellite orbits used for the network calculations.
1 GRAZ 47 4 1.66613 15 29 36.52595 538.283 0.000 538.283 2 GUESSING 47 4 27.03400 16 19 8.85316 281.957 0.000 281.957 3 HFLK 47 18 46.45376 11 23 9.92642 2384.142 0.000 2384.142 4 HKBL 47 22 38.11608 13 46 16.74570 1919.561 0.000 1919.561 5 KOETSCHACH 46 40 27.26782 13 0 33.65370 756.106 0.000 756.106 6 MATTERSBURG 47 44 16.32970 16 24 15.29809 293.819 0.000 293.819 7 PFAN 47 30 55.17915 9 47 4.78571 1090.272 0.000 1090.272 8 SBGZ 47 48 12.31079 13 6 37.54177 1323.548 0.000 1323.548 9 STPO 48 12 11.20744 15 37 58.51813 341.981 0.000 341.981 10 TREIBACH 46 51 38.83540 14 27 49.57115 671.490 0.000 671.490 11 VLCH 46 36 25.30363 13 51 1.62709 572.055 0.000 572.055 12 WIEN 48 13 7.87971 16 22 23.08993 243.808 0.000 243.808 13 NEUSIEDL 47 57 38.11486 16 50 11.70728 224.019 0.000 224.019 14 OBERPULLEND 47 30 22.43937 16 30 18.23333 308.331 0.000 308.331 15 WTZR 49 8 39.11273 12 52 44.07226 666.026 0.000 666.026 16 ZIMM 46 52 37.54931 7 27 54.99382 956.325 0.000 956.325 18 LINZ 48 18 35.21268 14 16 59.01369 335.030 0.000 335.030 19 RTMN 47 31 28.62906 14 20 35.97086 715.019 0.000 715.019 20 LINZ 11033 48 18 35.19873 14 16 59.08038 336.999 0.000 336.999 21 BLEIBURG 46 35 22.87115 14 47 38.09914 538.007 0.000 538.007 22 HGTW 48 11 45.93577 16 22 8.48945 248.195 0.000 248.195 23 KLAGENFURT 46 36 24.70914 14 19 9.63245 500.442 0.000 500.442 24 LANDSKRON 46 37 50.72479 13 53 34.08039 581.448 0.000 581.448 25 LEONHART 46 58 14.72098 14 47 9.30312 769.097 0.000 769.097 26 LIESERHOFEN 46 49 47.96241 13 28 35.94483 689.040 0.000 689.040 27 PATK 47 12 28.80603 11 27 36.65740 2298.532 0.000 2298.532 28 PENC 47 47 22.56947 19 16 53.50039 291.744 0.000 291.744 29 VLKM 46 39 41.07248 14 37 33.82848 527.308 0.000 527.308 30 WELS 48 9 30.03322 14 1 14.64900 385.191 0.000 385.191 31 KRBG 47 8 46.41438 10 37 36.54650 2258.017 0.000 2258.017 32 BADEN 48 0 3.37820 16 14 51.41542 281.955 0.000 281.955