简介:以测图鹰X-100为例,从野外数据采集、空三加密、正射影像图输出、数字线划图生成以及三维立体图建立几个方面结合实例对无人机低空摄影测量系统在大比例尺地形图中的应用进行了研究,并对其精度进行了分析,有效地解决了无人机数据处理中的关键问题,证明该系统应用于大比例尺地形图测绘中切实可行。
简介:郎静山是上世纪世界级的江苏摄影家,出生于淮阴,成名于大陆,因摄影是中国画意风格史称“集锦摄影”,获多种重要奖项于国外。后半身的创作与定居都在台湾,这样重要的摄影家,其画意风格让人津津乐道,但少有全面指导技法上的美学总结,深入探讨“集锦摄影”的画意风格。指出长时间人们对郎老指导法则:中国画历史中“六法”的误读,并阐释了世上真正的“六法”概念。并且指出郎静山对“六法”的理解一向失读,且指出这种失读背后真正深刻的艺术史原因。然后重新阐发,力图真正揭示出,郎静山作品风格背后的指导原则。并从“六法”失读中,阐释“集锦摄影”是取法哪些中国画原素。对中国摄影界提出看法,从郎静山身上寻找出对中国摄影界深刻的启示意义,并不局限于只是对郎老作品风格的解读而已。
简介:AIM:Tocomparetheregularityandaccuracyoflaserinsitukeratomileusis(LASIK)flapscreatedbytheZiemerFEMTOLDV'Classic'(Ziemer'Classic')andZiemerFEMTOLDVCrystalLinefemtosecondlaser(ZiemerCrystalLine).METHODS:Fourier-domainopticalcoherencetomography(RTVueOCT)wasusedtomeasurethemorphologyof200LASIKflapsof100consecutivepatientscreatedwiththeZiemerClassic(100flaps)ortheZiemerCrystalLine(100flaps)atoneweekpostoperatively.Flapthicknesswasevaluatedat36specifiedmeasurementpointsoneachflap.Forallprocedureswithbothlasers,thenominalflapthicknesswas110μm.RESULTS:ThemeanflapthicknessoftheZiemerCrystalLinegroup(102.49±2.68μm)wasthinnerthanthatoftheZiemerClassicgroup(107.65±5.09μm)(P<0.01).Averagethicknessofallflapswasuniformwithin4μmatallmeasurementpoints.TheflapsintheZiemerCrystalLinegroupweremoreregularthanthoseintheZiemerClassicgroupwhenmeasuredfromthecentertotheperiphery.Themaximumdeviationfromthenominal110μmof36measurementswas8μmintheZiemerClassicgroup,whileintheZiemerCrystalLinegroupitwas9μm.Withinthe3600measurementsonthe100eyes,differencesgreaterthan20μmwereobserved0.14%intheZiemerClassicgroup,and0.04%intheZiemerCrystalLinegroup.CONCLUSION:TheflapscreatedwiththeZiemerFEMTOLDVCrystalLinefemtosecondlaseraremoreuniformandthinnerthanthosecreatedbytheZiemerFEMTOLDVClassicfemtosecondlaser.
简介:AIM:Toassesstheeffectofmyopiaonthethicknessofretinalnervefiberlayer(RNFL)measuredby3Dopticalcoherencetomography(3D-OCT)inagroupofnonglaucomatousChinesesubjects.METHODS:Twohundredandfifty-eighteyesof258healthyChinesemyopicindividualswererecruitedandfourgroupswereclassifiedaccordingtotheirsphericalequivalent(SE):lowmyopia(n=42,-0.50