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Phoenix Landing Site Topomapping UpdatePhoenix Landing Site

Topomapping UpdateRandolph Kirk, USGS

5th Phoenix Landing Site Workshop

23 January 2007

Randolph Kirk, USGS5th Phoenix Landing Site

Workshop23 January 2007

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OutlineOutlineThe Old PlanHiRISE Stereo Mapping: First ResultsAvailable DataThe New Plan

The Old PlanHiRISE Stereo Mapping: First ResultsAvailable DataThe New Plan

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The Old PlanThe Old PlanMapping results

Latitude zone fairly homogeneousBenign at MOC resoluton and larger

Site selection—and imaging strategyDown-selected to Region B, 3 boxes therein

USGS CDP deliverables6 MOC DTMs by 1/074 partial HiRISE DTMs (best effort 1/07)3 full HiRISE DTMs by 6/07

Mapping resultsLatitude zone fairly homogeneousBenign at MOC resoluton and larger

Site selection—and imaging strategyDown-selected to Region B, 3 boxes therein

USGS CDP deliverables6 MOC DTMs by 1/074 partial HiRISE DTMs (best effort 1/07)3 full HiRISE DTMs by 6/07

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HiRISE Images of Region BHiRISE Images of Region B

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HiRISE Stereo MethodologyHiRISE Stereo MethodologyWhat’s the same as for MOC, HRSC?

Ingest in ISIS, stereomap in SOCET SETWhat’s new?

ISIS 3 not ISIS 2Geometric characteristics

Multiple offset & rotated detectorsDetectors offset from center of distortionJitter potentially greater (in pixels)

Pre-correct images for these effects by resampling with ISIS program noproj

What’s the same as for MOC, HRSC?Ingest in ISIS, stereomap in SOCET SET

What’s new?ISIS 3 not ISIS 2Geometric characteristics

Multiple offset & rotated detectorsDetectors offset from center of distortionJitter potentially greater (in pixels)

Pre-correct images for these effects by resampling with ISIS program noproj

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1st Stereopair Mapped: Victoria1st Stereopair Mapped: Victoria

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MOC, HiRISE DTMs ComparedMOC, HiRISE DTMs ComparedContour Interval 3 m

MOC: 5 m/postManually edited

HiRISE: 1 m/post Auto-matching, limited editing

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HiRISE DTM EnlargedHiRISE DTM Enlarged

100 m

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Perspective ViewsPerspective ViewsRelief shadingNo exaggeration

Absolute slopes0°–60°

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First ReactionsFirst ReactionsHiRISE stereopairs support production of 1 m/post DTMs by automatic matching w/ minimal editingDTM “noise” of 0.2–0.3 m indicates 0.2–0.3 pixel RMS matching error (as for most other datasets)Cross-track jitter induces ~1 m height errors; along-track jitter does not prevent matchingDTM is not visibly “warped” by optical distortionMatching succeeds even in bland areas (using DoG filter) but not in bland steep areasMatching succeeds in deep shadows, but moving shadow edges cause mismatchesMost other terrains will be easier to map

HiRISE stereopairs support production of 1 m/post DTMs by automatic matching w/ minimal editingDTM “noise” of 0.2–0.3 m indicates 0.2–0.3 pixel RMS matching error (as for most other datasets)Cross-track jitter induces ~1 m height errors; along-track jitter does not prevent matchingDTM is not visibly “warped” by optical distortionMatching succeeds even in bland areas (using DoG filter) but not in bland steep areasMatching succeeds in deep shadows, but moving shadow edges cause mismatchesMost other terrains will be easier to map

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HiRISE Stereopairs (to date)HiRISE Stereopairs (to date)

D1D2

A3

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Image and Stereo Coverage: Regions A+D

Image and Stereo Coverage: Regions A+D

Thanks to Shane Byrne for adjusted MOCfootprints and stereopair identifications

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Summary of Available DataSummary of Available Data

43HiRISE Stereopairs12661HiRISE Images18628MOC Stereopairs

1558214MOC ImagesIn 65°–72° ZoneIn Boxes A+D

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The New PlanThe New PlanFull stereo DTMs from existing HiRISE pairs (“ST”)

A3 pair may be problematic because of clouds)Additional full/partial HiRISE stereo DTMs from any pairs acquired before season endsLook for HiRISE images where photoclinometry can be calibrated against MOLA (“M-PC”) or against rock shadows if possibleMOC ST in A+DMOC M-PC in A+DMOC ST elsewhere in zoneMOC M-PC elsewhere in zoneIf all images are used and customer is satisfiedbefore funding runs out, start HiRISE ST of MSL sites

Full stereo DTMs from existing HiRISE pairs (“ST”)A3 pair may be problematic because of clouds)

Additional full/partial HiRISE stereo DTMs from any pairs acquired before season endsLook for HiRISE images where photoclinometry can be calibrated against MOLA (“M-PC”) or against rock shadows if possibleMOC ST in A+DMOC M-PC in A+DMOC ST elsewhere in zoneMOC M-PC elsewhere in zoneIf all images are used and customer is satisfiedbefore funding runs out, start HiRISE ST of MSL sites