| Confusions with map_image! [message #66868] |
Fri, 12 June 2009 02:19  |
hethomas
Messages: 19
Registered: December 2008
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Junior Member |
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Having spend the last couple of weeks trying to figure this out, I
gather this isn't an uncommon problem, but hope that someone might be
able to clarify -
I have taken some global satellite data, and rebinned this into
0.25x0.25 degree pixels. Now I want to plot my data as an image for
display. The data was originally in the format lat, long, data, but I
formed data into a grid of 1440 x 720 in order to plot.
The issue I am having is that there appears to be so many variables
regarding the use of MAP_IMAGE, which seem to change my values
significantly that I am not unsure what the "right" answer is! For
example, the maxiumum value in my original grid could be 50, yet after
using MAP_IMAGE this is reduced to say 35. The main factor which
seems to affect this is the window size - I have set this to
xsize=1453, ysize=749 in order to have a resulting image size of
x=1440, y=720, but the values (although close) are still different.
If anyone can shed any light on this I would be really greatful!
Helen
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| Re: Confusions with map_image! [message #66969 is a reply to message #66868] |
Sat, 13 June 2009 05:29  |
hethomas
Messages: 19
Registered: December 2008
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Junior Member |
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James -
I am using L1B data, and processing it myself to generate the
lat,long, so2 dataset. The fact that there are many more data at the
poles doesn't matter as I have averaged all values over a 0.25x0.25
grid, because I am trying to get a representation of the daily
average.
Having played around with this extensively, I am, as David suggested,
now steering clear of MAP_SET as none of the projections appear to
plot the data in the right place. Thanks for your thoughts!
Helen
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