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gnomview
This IDL facility provides a means to visualise a Gnomonic projection
(radial projection onto a tangent plane) of
HEALPix and COBE Quad-Cube maps in an IDL environment.
It also offers the possibility to
generate GIF, PNG and Postscript color-coded images of the projected map.
The projected (but not color-coded) data can also be output in FITS files and
IDL arrays. Location in HEALPix directory tree:
src/idl/visu/gnomview.pro
FORMAT
QUALIFIERS
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- For a full list of qualifiers see mollview
KEYWORDS
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- For a full list of keywords see mollview
DESCRIPTION
gnomview reads in a HEALPix sky map in FITS format and generates a
Gnomonic projection of it, that can be visualized on the screen or
exported in a GIF, PNG, Postscript or FITS file. gnomview allows the selection of
the coordinate system, point of projection, map size, color table, color bar inclusion,
linear or log scaling, histogram equalised
color scaling, maximum and
minimum range for the plot, plot-title etc. It also allows the representation of the
polarization field.
RELATED ROUTINESThis section lists the routines related to gnomview
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- see mollview
EXAMPLE # 1:
gnomview reads in the map 'planck100GHZ-LFI.fits' and generates
an output image of the size of 500 x 500 screen pixels,
with a resolution of 2 arcmin/screen pixel at the center.
The temperature scale has been set to lie between 100, and the units will
show as K.
The title 'Simulated Planck
LFI Sky Map at 100GHz' has been appended to the image.
The map is centered at (l=160, b=-30)
EXAMPLE # 2:
makes a gnomic projection of map (see Figure 1b on
page ) after an arbitrary rotation, with a graticule grid
(with a 45o step in longitude and 30o in latitude) and an arbitrary triangular outline
Eric Hivon
2010-06-18
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