300-230906-3253

The Mars Express orbiter with its High Resolution Stereo Camera acquired data in the Cydonia region between April 2004 and July 2006 multiple times. High flight altitudes as well as dust and haze in the Martian atmosphere resulted in a poor data resolution on the ground. But on July 22, 2006 the HRSC-Experiment was successful in orbit 3253 and took image 230906 [5]. It was published in 2007 and is now found in “HRSC Produktserie #300 – Cydonia Orbit 3253”. There are also stereo pictures available, but these are wide range photographs and have only little recognizable 3D effects.

The following tables show the results of the measurements in the five pictures together. The width was determined like measurements with a slide gauge are done. Straight lines parallel to the straight margins were moved towards the mountain until they seem to touch them and then the distance was measured. For the determination of the length of the mountain a set of two other parallel lines perpendicular to the first set was used to move them towards the arcs until they seem to contact them. The first table for the measurement of the width shows also the x/y-coordinates in pixels of the right/eastern point PE and the left/western point PW, which were used to determine the distance of the parallel lines from east to west:

Years Orbiter Picture Size Resolution PEx PEy PWx PWy Pixel Width
1976
Viking
1204x1056
48m
353
464
384
488
39,2
1882m
1998
MGS
1024x1121
4.3m
228
220
435
491
435,6
1873m
2001
MGS
2400x2400
1.5m
1702
1017
542
1533
1270
1905m
2006
MRO
20048x15000
2048x1532
29.9cm
2.9279m
854
930
1413
640
630
1845m
2007
MEX
4970x3833
17.3m
2690
2278
2561
2363
154
2664m

The second table for the measurement of the length shows also the x/y-coordinates in pixels of the upper/northern pointPN and the lower/southern point PS, which were used to determine the distance of the parallel lines from north to south:

Years Orbiter Picture Size Resolution PNx PNy PSx PSy Pixel Length
1976
Viking
1204x1056
48m
352
498
384
452
56,0
2689m
1998
MGS
1024x1121
4.3m
52
452
593
236
621,3
2672m
2001
MGS
2400x2400
1.5m
753
447
1491
2103
1813
2719m
2006
MRO
2048x1532
20048x15000
2.9279m
29.9cm
1345
8885
1193
3912
921
13039
920
8892
377
11774
2692m
2699m
2007
MEX
4970x3833
17.3m
2690
2278
2561
2363
154
2664m