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| '''Purpose of test:''' To evaluate SPC's ability to represent a simplified 'boulder' which has a constant 20 degree slope. | '''Purpose of Test 11:''' To evaluate SPC's ability to represent a simplified 'boulder' which has a constant 20 degree slope. |
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| '''Additional Objectives''' * |
'''Objective for Test 11 S, T & U, Spacecraft Zenith Variations''' * To investigate the effect of varying the combinations of viewing conditions which comprise the image suite, specifically: * Variation of spacecraft zenith (emission angle); * To investigate the effect of the number of images and viewing conditions. |
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| * A single peak in an otherwise flat landscape of width ?? - Modeled using a single maplet (no overlaps). | * A single peak in an otherwise flat landscape of width 5m - Modeled using a single maplet (no overlaps). |
Spacecraft Zenith Variations
Aim and Objectives
Purpose of Test 11: To evaluate SPC's ability to represent a simplified 'boulder' which has a constant 20 degree slope.
Objective for Test 11 S, T & U, Spacecraft Zenith Variations
- To investigate the effect of varying the combinations of viewing conditions which comprise the image suite, specifically:
- Variation of spacecraft zenith (emission angle);
- To investigate the effect of the number of images and viewing conditions.
Methodology
The 'boulder' was simulated by generating a simple axe-symmetric, flat-topped cone (peak) with a constant 20 degree slope. Two boulder simulations were generated:
- A single peak in an otherwise flat landscape of width 5m - Modeled using a single maplet (no overlaps).
- Multiple peaks and (simplified) craters in an otherwise flat landscape of width approx. 22.5m.
Data
- Data was generated by .
- Location and parameters for evaluation area.
- Image resolutions: 2cm/pixel.
Note that a larger image suite was planned and produced than was utilized during test. The images for a number of planned viewing conditions were eliminated due to image quality related to the viewing conditions being unfit for SPC. For further details are contained here: Test11STU Unsuitable Viewing Conditions.
Name |
Sun |
S/C Az |
S/C Zenith |
Total Number of Images |
Test11S |
45, 0, -45 |
every 45 |
0, 30, 60 |
80 |
Test11T |
45, 0, -45 |
every 45 |
0, 20, 40, 60 |
112 |
Test11U |
45, 0, -45 |
every 45 |
0, 15, 30, 45, 60 |
144 |
Test11S
Test11T
Test11U
Bigmaps
The following TAG1 bigmaps were tiled/iterated and evaluated:
Starting topography defined from: START1.MAP at pixel/line location 49, 49.
Step |
GSD |
Overlap Ratio |
Q Size |
Width |
10cm-Tiling |
10cm |
1.3 |
130 |
20m |
5cm-Tiling |
5cm |
1.3 |
250 |
20m |
5cm-Iterations |
5cm |
- |
- |
20m |
Tiling/Iteration Parameters
Auto-Elimination Parameters: 0, 60, .25, .25, 0, 3.
Reset albedo/slopes: NO
Determine Central Vector: YES
Differential Stereo: YES
Shadows: YES
Results
Results with Overlaps:
Test Over11STU Comparative Results
Results without Overlaps: