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The relative height error is estimated as random error together with the final elevation difference measurements.
As explained in detail in37 the TanDEM-X global DEM and all intermediate raw InSAR DEMs are affected by the absolute horizontal error, the absolute height error and the relative height error that describes local height variations.
The absolute height error of the DEMs computed with ITP takes interferometric coherence and geometrical considerations into account36,37.
In the present study, which relies on TanDEM-X TanDEM-X raw DEM differencing, we only quanTanDEM-X TanDEM-X heighTanDEM-X TanDEM-Xcene separawely.
For the DEMs used in the present study and over the floating part of the glacier the resulting height error is ranging from 0.65 to 1.35 m.
Present method has less height error compared to the CIP method of characteristics by several orders of magnitude.
Similar(38)
Then, a newly released DEM, removing both vegetation bias and random errors (i.e. Multi-Error Removed DEM), is employed to overcome the limitation of height errors.
The height errors of the drive elements are believed to be the main reason for the larger variation in step length of the walking mechanisms.
A "reference station following station" control scheme enables nonsynchronous height errors between the reference station and the following stations to be controlled within ±4 mm during the whole lifting process.
Using previously calibrated ("default") values of a free parameter γ, all models predict the observations reasonably well (median root-mean-square wave height errors are between 10%and20%0%) at all field sites.
a The distribution of estimated height errors.
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