Why was the absolute horizonal accuracy for the Level-2 posts only +/-20 meters? Doesn the Global Positioning System provide better accuracy? Is it related to sample size?
The horizontal accuracy of SRTM posts is only weakly related to the accuracy of GPS. Many other factors are involved, including the accuracy of our measurements of the mast length and orientation (the biggest error source), timing errors, multipath, phase measurement errors, and thermal noise in the radar system. We pushed the radar hardware we “inherited” from SIR-C/X-SAR to its limits in order to get the best horizontal and vertical errors possible.
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