HiRISE DEM's |
HiRISE DEM's |
Apr 13 2008, 10:46 AM
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#1
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Founder Group: Chairman Posts: 14448 Joined: 8-February 04 Member No.: 1 |
Late last week I stumbled upon a few HiRISE derived DEM's (Randy Kirk works his magic once again!)
http://webgis.wr.usgs.gov/ftphirise/index.jsp (URL now down) I'm working on both Vic Crater and the Columbia Hills. Fortunately, now I've got a Mac, I can use ISIS. I've figured out a fairly simple flow ( isis2raw as 16 bit unsigned, and then imported into Photoshop ) to take DEM CUB's and make 16 bit PNG's Just to demo how important that is for me as an animator - sliced comparisons of 8bit vs 16 bit. A busy week unfortunately, but animations of various sorts are in the pipeline. |
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Oct 13 2008, 09:18 PM
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#2
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Founder Group: Chairman Posts: 14448 Joined: 8-February 04 Member No.: 1 |
I prepared this for someone else - thought forum people might enjoy it
1) Install ISIS 3 - instructions here http://isis.astrogeology.usgs.gov/document...uide/index.html 2) While letting that happen - grab one of Randy's DEM's - I'm using the Victoria Crater bundle as an example 3) Find DEM_1m_VictoriaCrater.cub.gz (it's in the ISIS_EQUI360_OC folder ) and expand it 4) Run isis2raw 5) In the 'FROM' window - point to the .cub 6) Copy and paste the path and filename into 'TO' - but change the extension to .dem or something simiar 7) U16BIT data type ( screenshot attached) 8) Hit Run.... if this bit doesn't work - it's almost certainly your ISIS3 installation that needs looking at, make sure you got all the Base Data. 9) Find the .cub and open in text edit and find this part... /* Core description */ CORE_ITEMS = (1278,1694,1) 10) Open Photoshop, and open the .dem.raw that ISIS3 produced 11) Width is the first of those three figure under CORE_ITEMS. Height is the second. Depth should be 16 bits, Byte Order as IBM PC, Header as size 0 12) Hit OK 13) Save out as 16 bit PNG, celebrate, have lunch, dump into your favourite animation package. |
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