Mars Express data workshop21-23 May 2008: HRSC & OMEGAWashington University in St. Louis

HRSCview: online version

Greg MichaelPlanetology and Remote SensingInstitute of GeosciencesFreie Universitaet Berlin

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HRSCview: online version- Tour… http://hrscview.fu-berlin.de

- Entry page- Coverage maps- Pre-selected views

- Image selection- Via footprint maps

- Zooming, re-centring- Footprint shading- Archival DTM/orthimage map- Map scale

- By surface coordinates- By image identifier

- Composite modes- Nadir, elevation, slope, colour: mars-like, raw,

stretched, enhanced, ratio, IR-substitution- Image scale

- Perspective views- Direction, exaggeration

- Data product pages- Image label items- Downloads: levels 2, 3, 4- PDS, VICAR formats

- Processing- Image lookup

- Overlap map and look-up table- Subsetting

- nadir, dtm, r-, g-, b-, ir-channels- (latitude, longitude) to (line, sample)- (map scale, view size) to (subset size)- Extract subset, downsampling if necessary- Upsample if necessary

- Compositing- Stretch nadir- Colourise DTM- Stretch and composite (r,g,b) or (ir,g,b) or

(ir/r,r/g,g/b)- Composite (nd, colour) or (nd, colourised DTM)

with HSV transform (pan-sharpening)- Perspective projection

- Project DTM with overlaid composite- Delivery

- Package as jpeg image- Accompanying (lat, lon)-grid, distance and

elevation bars

Mars Express HRSC/OMEGA data workshop, St. Louis, 21-23 May 2008

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HRSC Stereo processing• Preliminary 200m DTMs and orthoimages

• fully automatic processing sequence• fast availability, for initial assessment of new data• no quality control, orientation data not improved by bundle adjustment

• Archival HRSC DTMs (up to 50m resolution) and orthoimages • generated at full resolution and based on refined orientation data• Ongoing systematic processing (currently to orbit 1961)

• Within HRSCview:• Absolute scales for MOLA areoid-referenced DTMs (.da4 products)• Local relative scales for preliminary DTMs; some features not offered to avoid misinterpretations

Mars Express HRSC/OMEGA data workshop, St. Louis, 21-23 May 2008

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Slope maps• baseline

• slope is calculated over a two-displayed-pixel baseline where the displayed pixels are larger or equal to the DTM pixels; where the displayed pixels are smaller than the DTM pixels, the slope is calculated over a two DTM-pixel baseline.

• gradient/slope scales

Mars Express HRSC/OMEGA data workshop, St. Louis, 21-23 May 2008

Mars Express data workshop21-23 May 2008: HRSC & OMEGAWashington University in St. Louis

HRSCview: local data version

Greg MichaelPlanetology and Remote SensingInstitute of GeosciencesFreie Universitaet Berlin

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HRSCview: local data version- Installation and set up

- IDL virtual machine- HRSCview software:

- http://hrscview.fu-berlin.de/software.html- mex4 directory, global basemap

-Filenaming- Hxxxx_yyyy_NDL.IMG- ND - (ND, RE, GR, BL, IR, DT, DA) –

channel/DTM- (ND, RE, GR, BL, IR, DT, DA) sets in single

folder- User-generated product sets should differ by

these 2-letter indicators only, e.g.:- mosaic.nd, mosaic.dt, mosaic.re etc.

-Quick tour of features- Basic ones as online HRSCview- Footprint map- Panning, zooming- RGB without nadir- DTM: colour-scaled, shaded relief, contours- Stretch locks- Colour interpolation

-DTM analysis tools- Volume and area measurements

- Working DTM: copying, cutting, zero level shifting- Volumes relative to local surface (e.g. channels)

- Defining local surface

-Surface elevation profiles- Single and multi-section paths- Isotropic profiles- Export

-Crater counting- Three-point marking- Crater table export

- Including unit surface area

Mars Express HRSC/OMEGA data workshop, St. Louis, 21-23 May 2008