Isis 3 Application Documentation
Create shaded-relief cube from topographic cube
Overview
Parameters
Example 1
Description
This program will create a shaded-relief cube from a topographic cube. It uses the sun angle (azimuth)
as well as the solar elevation (zenith) to compute the correct shading on the output cube.
Categories
History
Tracie Sucharski 2003-01-09
Original version
Tracie Sucharski 2003-01-28
Changed category from filter to photometry.
Tracie Sucharski 2003-02-07
Changed user parameter names and now read pixel resolution
from labels.
Kim Sides 2003-05-13
Added application test
Stuart Sides 2003-05-16
Modified schema location from astogeology... to isis.astrogeology..."
Stuart Sides 2003-07-29
Modified filename parameters to be cube parameters where necessary
Brian Peck 2006-12-25
Algorithm change and input parameter change.
Mackenzie Boyd 2010-01-06
Reversed slopes to be correct. Changed azimuth to be 0 degrees is 12
o'clock rotating clockwise. Updated documentation to match.
Parameter Groups
Files
Name
Description
FROM
Input cube
TO
Output cube
Sun Parameters
SCALE PARAMETERS
Files :
FROM
Description
Use this parameter to select the input filename. All bands within the file
will have the shade applied.
Type
cube
File Mode
input
Filter
*.cub
Files :
TO
Description
This file will contain the shaded output image.
Type
cube
File Mode
output
Pixel Type
real
Sun Parameters :
AZIMUTH
Description
The direction of sun with 0 degrees at the 12:00, north position,
rotating clockwise. Ranging from 0 to 359.9.
Type
double
Default
90.0
Minimum
0
(inclusive)
Maximum
360
(exclusive)
Sun Parameters :
ZENITH
Description
The Sun Angle is the elevation at which the sun is relative to the
planet horizon. 90 degrees is at the horizon, 0 is directly overhead.
Type
double
Default
45.0
Minimum
0
(inclusive)
Maximum
90
(inclusive)
SCALE PARAMETERS :
PIXELRESOL
Description
The pixel resolution of the image. This parameter will default to
the value from the labels or may be used to increase or decrease the
apparent steepness. If no mapping group exists, the user must enter a
pixel resolution. Greater than the image's pixel resolution will level
and smooth, and less than will make steep and sharpen.
Type
double
Internal Default
Automatic
Example 1
Shading Vallis Marinaris
Description
Creating a shaded relief of Vallis Marinaris with a 22 degree azimuth
and a 45 degree zenith
Command Line
shade from=vallis_marinaris.cub to=22.cub azimuth=22
In this example shade will create a shaded relief of Vallis Marinaris
with a 22 solar azimuth and a 45 degree zenith
GUI Screenshot
shade Gui
Example Gui
Screenshot of the GUI with parameters filled in to perform a 22
azimuth shade on our input image.
Input Image
Input image
Input image for shade
Parameter Name:
FROM
This is the input image used in the creation of our shaded relief.
Output Image
Output image showing results of the shade application.
Output image for shade
Parameter Name:
TO
This is the output image that resulted.