Download Block adjustment

Block adjustment
PHOTOMOD 6.0.2
• in the Points usage section input 0.01 to the Coordinates delta threshold
(pix) input field;
• in the DTM for adjustment section set the Use DEM option and load the
DEM from file.
During mono block adjustment it is highly recommended to use DEM due to insufficient images overlap area. Otherwise, there are errors in the correlator work, as
well as errors in calculating Z coordinates of tie points measurements.
3. Click OK.
4. Click the
button of the Block adjustment toolbar.
5. Tie points with tie residual that exceeds 10-20 pixels transfer into Excluded
status in the By ties section of the Information window (see Section 5.5).
6. Set the Use ties in block adjustment checkbox in the Points usage section
on the Points tab of the Parameters window.
For images with ’low-quality’ exterior orientation parameters it is recommended to set
the Affine option in the Parameters window on the Images tab in the Refinement
section.
For images with precise exterior orientation parameters it is recommended to set the
None in the Parameters on the Images tab in the Refinement section. In this case
the refinement will be not calculated.
7. Click the
more.
button of the Block adjustment toolbar to adjust the block once
8. Tie points with tie residual that exceeds 2-5 pixels transfer into Excluded status
in the By ties section of the Information window (see Section 5.5).
9. Perform adjustment accuracy control (see Section 11).
All steps of adjustment procedure require evaluation of adjustment results accuracy.
Here the tie points measurements and exterior orientation parameters consistency
could be evaluated. During monoblock adjustment, the adjusted estimate of the accuracy of tie points coordinates in meters is displayed as 0. This is due to the fact that
DEM serves as a reference data for the tie points. Therefore, quality control of
monoblock processing reduces to estimating errors on tie points.
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