iGage X90-OPUS User Manual
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Contents
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40uploader screen. When it reaches the end:Click on OK, then wait 30-seconds, turn off the GPS receiver,finally turn it back on. Your receiver has the latest firmware.OPUS: What is it?OPUS (Online Positioning User Service) is a free serviceprovided by the NGS (National Geodetic Survey.)From the NGS Website:“This Online Positioning User Service (OPUS) providessimplified access to high-accuracy National SpatialReference System (NSRS) coordinates. Upload a GPS datafile collected with a survey-grade receiver and obtain anNSRS position via email.OPUS requires minimal user input and uses software whichcomputes coordinates for NGS' Continuously OperatingReference Station (CORS) network. The resulting positionsare accurate and consistent with other National SpatialReference System users.”Here are direct links to more detailed information:http://geodesy.noaa.gov/INFO/OnePagers/OPUSOnePager.pdfhttp://geodesy.noaa.gov/OPUS/about.jspOne of the most important contributors to vertical accuracycomputed by OPUS-Static is the length of occupation.Longer times are better.If you are concerned about elevation, please remember thata 2 hour OPUS static observation has an expected heightaccuracy of 2.5 cm. A 6-hour occupation has an expectedaccuracy of 1.5 cm.Again, longer times are better. Your expectations should betempered by this NGS graph: |
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