Post on 03-Jan-2016
Mars Express data workshop21-23 May 2008: HRSC & OMEGAWashington University in St. Louis
HRSCview: online version
Greg Michael
Planetology and Remote Sensing
Institute of Geosciences
Freie Universitaet Berlin
2
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 Michael
Planetology and Remote Sensing
Institute of Geosciences
Freie Universitaet Berlin
6
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