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    2013-07-07 00:04:12Դ: ̳ߣ

      ժҪGPS۲Ϣù۲GPSӦоȵ㣬ijƽֱΪ5.0′×5.0′ݺGPS/ˮ׼ݣEGM96ȫģͺ͸ָ߳ģͲȥ-ָ˸2.5′×2.5′ֱƴˮ׼ģͣڡ⾫ȵļ飬ƴˮ׼ģ͵ľ0.06mGPS۲ϢԵõĵȼ¼ˮ׼ҪߣʵGPSڼκϵάλܡƴˮ׼ֹӦǰ˷
    ؼ: ֹƴˮ׼棬߳쳣
    1
    ֵϢʱҪ־֮һʵֹҿɳչҪֶ,Ӧǰdzֵֹһ, ԻϢΪ, ϸֻĵͼרͼеؼͼ, طݡݵȻϢ, ʹֹĸϢʵֿռϢĹ뻥, ӶٽԴϢĸЧ, ϢĿγľЧ[1]
    ϢԸֱߵͼΪģȫҰֻλͼڼ֧·չĸµβ漼Ϊй滮عõҪ뽨ƽ漰߳ϵͳͳһĸ߾Ȼȫֻͼͼ⡣ͳͼĸ߳̿ͨˮ׼ʵֵġGPSڲĹ㷺ӦãGPS۲Ϣù۲ߣ𽥳ΪGPSӦһоȵ㡣GPS Զλܹ10-610-8ϻλά꣬õĸ߳ϢWGS-84Ĵظߣҹķ߳ϵͳƴˮ׼Ϊ׼߸̡߳GPSϸ߾ȡ߷ֱʣƣˮ׼ģͿȡͳˮ׼ⶨߣʵGPSڼκϵάλ[2,3]
    ijGPS/ˮ׼ݺݣȫģͺָ߳ģͣϷ˸׼ƴˮ׼ģͣƴˮ׼ֹеӦǰ̽֡
    2ϼԤ
    2.1 ݴ
    ʵƽֱΪ5.0′×5.0′õʵݺ͸߷ֱʵָ߳ģͣDEMͨռֲθ;̣ɢľ쳣Ϊֵ֪Ȼþֲڲ巨ȷ5.0′×5.0′쳣ڸͨķ̣õƵ5.0′×5.0ռ쳣
    2.2 ȫģ
       EGM96ģǸݡDz߹۲ֵԼĵ۲ϼ360 ȫģ͡ĿǰձõĹʲοģ͡
    2.3 ָ߳ģͣDEM
    ʵ֣USGSݵϢĹդʸԴݼGTOPO30ָ߳ģͣDEMGTOPO30ȫ30″С1ָ߳ģͣGTOPO30 ĸ̵߳λΪƽˮĵλ, Ϊ±30mƽ׼WGS84
    2.4 GPS/ˮ׼
    ռCGPS65㣬ƽΪ10CGPSLeica˫ƵGPSջʩ⣬ҵʽΪ侲̬Զλģʽÿλ۲ʱ6СʱϣߴƽGPSuveryУWGS-84ԼƽλΪ׼ÿCGPSȾȽˮ׼۲⣬߳ϵͳ1985Ҹ̻߳׼ƽ߳Ϊ±2.31cmGPS/ˮ׼ֲͼ1ʾ
    Fig.1  Distribution of GPS/leveling point
    3ƴˮ׼ļ
    3.1ƴˮ׼㷽
    ڼƽ߳̽ϵͣ󣬾㣬Դˮ׼ӰΪ׼ģͣ360ףֱΪ50ȥģ쳣IJв쳣Ҳ˼˾ֲεӰ죬˰ƴˮ׼߷Ϊּ㣬һȫģͼģͣƣˮ׼߼ģ쳣ڶɹ۲쳣ֱȥһֵ쳣õIJв쳣Լɲв쳣ݼIJвƣˮ׼ߣ[2,4,5]
                      1
    ʽУ EGM96ģͼģ͸߳쳣㹫ʽΪ[6,7]
          2
    ʽУ Ϊʸ Ϊࣻ Ϊľȣ Ϊ Ϊֵ Ϊȫ񻯵İõ¶ʽ   Ϊȫ񻯵гϵWGS-84ΪοйزɲIJο[1,3] 
    3.2 ƴˮ׼
    MolodenskyһϲȡһƵֲθвռ쳣γɲвFaye쳣ӦStokesʽ2.5′×2.5′в߳쳣 㹫ʽΪ[8,9]
                             (3)
    ʽУ Ϊƽ뾶 Ϊֵ вռ쳣 Ϊֲθ ΪStokes ǵλϵԪ2.5′×2.5′ģ͸߳쳣 в߳쳣 ֮ͼΪָ2.5′×2.5′߳쳣͵õƣˮ׼ֵģ͡
    3.2 ƴˮ׼GPS/ˮ׼ƴˮ׼
    ȫλģͺ;ֲݵijIJһ£ͬԴ̻߳׼׼IJЩضƴˮ׼GPS/ˮ׼ƴˮ׼нϴϵͳƫͲֵɷֱȽϸӣü򵥵任ģ⡣ݹƴˮ׼ϵľ飬Ĵ϶ʽΪϺƴˮ׼ϵGPS/ˮ׼ƴˮ׼ϣĴζʽжµĵʹһƫбԲϵĸߴɽϲвڽϵˮƽͻƴˮ׼ƴˮ׼ĸֵģļʽ, 2.5′×2.5′߳쳣ֵͼ2ʾ
    Fig.2  The isoline map of  height anomaly
    ͼʾ˸ƴˮ׼ı仯ƣ忴ƴˮ׼仯ƽλƽԭĵΡòȽϷϡ
    4ƴˮ׼ľȷ
    Ϊ֤÷ĿɿԣGPS/ˮ׼óƴˮ׼ģͽڷϾȺϾȵ
    2.5′×2.5′ƴˮ׼ģڲ65CGPS/ ˮ׼ĸ߳쳣GPS/ ˮ׼ʵ߳쳣Ƚϣ65CGPS/ ˮ׼μƴˮ׼ģ͵Ĺ˲ֵڷϾȵļ顣ijڸ35DGPSΪϾȼݣ35DGPSҲȾȽˮ׼۲⡣35DGPSûв빹ƴˮ׼ģͣΪϾȣڡ⾫ȵͳƽڱ1
    12.5′×2.5′ƴˮ׼ֵڷϾͳȽ/m
    Table1: The inner accuracy statistics and comparison of 1.5′×1.5′quasi-geoid grid fit result /m
    ˵ ֵ Сֵ ƽֵ ׼
    ڷϾ   65 0.0729 -0.06571 0.0010 ±0.0315
    Ͼ     35  0.1188 -0.0984 -0.0010 ±0.0556
    ӱ1ıȽƴˮ׼ڡϾڸ6.0סԵó,ƴˮ׼ģͽϱرʾ߳쳣ı仯ƴˮ׼ģ;ȴﵽ׼
    5ƴˮ׼ֹ̲еӦǰ
    ṩ߾ȵάGPSͻŵص֮һֲͼеĸ߳̿ôͳļˮ׼ķԴڽͨ㡢θӡͨˮ׼ϡٵĵˮ׼·ԽϳЩʹø̲߳輫Ϊѡͨ߷ֱʵ׼ƴˮ׼ģͣGPS۲ظ߿תΪߣﵽĵȼ¼ˮ׼ľҪ봫ͳˮ׼,ƴˮ׼沼GPSά̿GPS䲻ͨӡͶǿȡۻ߹Чʵŵ,Դ鹤ССߵͼͼƺͳеؼͼԸ̵߳ľҪ󣬲Ϊ “ֳ”ṩЧݲɼϵͳ
    GPS IJϷչ, ߾ȡ߷ֱƴˮ׼ȷ, ƴˮ׼GPS ̲߳𲽴泣漸ˮ׼ʵϵGPSάλܡƴˮ׼澫Ҳǽҹִز׼͵ռܵҪ֮һ̽ƴˮ׼ֹеӦþй㷺ӦǰԶʵ塣

    οף 
    [1].˱. Խɽ̵ֹ˼뽨[J]. ɽʣ200117156-59.
    [2].,¿,. ƽй2000ƴˮ׼ȷ[M]. 人:人ѧ,2003.
    [3].,־,. ҹʡмˮ׼״ģʽ[J]. زѧ20042414 -8
    [4]. κ,. õλģͺGPS/ ˮ׼ȷҹ½ƴˮ׼[J].ѧ20033211-5
    [5].Kandiah Jeyapalan. Local Geoid Determination Using Global Positioning Systems[J].Land information science.2004,64(1):65-75.
    [6].RAPP R H. Use of Potential Coefficient Models for Geoid Undulation Determinations Using a Spherical Harmonic Representation of the Height Anomaly/ Geoid Undulation Difference[J ] . Journal of Geodesy , 1997 ,71 :282-289.
    [7]. أ. ״ⲿϣ. 磬1981283-358.
    [8]. ɣƽ.׼ƴˮ׼о[J].ռϢ2005321-5.
    [9].,־,մ,. 1km ߷ֱ׼߾ȴˮ׼ȷ[J] . ѧ,
    2003 ,32 ( 2) : 102107

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