| mapping/zooming [message #4804] |
Thu, 10 August 1995 00:00  |
delp
Messages: 3
Registered: August 1995
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Junior Member |
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I'm trying to display a map of the north polar region.
First, I'd like to have the window initialized with the continents between 55-90
degrees lat displayed. I've tried
map_set, 90, /grid, /continent, /azimuthal, limit=[55,-180,90,180]
but I get floating point errors. Any ideas?
Second, I'd like to draw a bounding box and have it's contents zoomed to fill the display.
I've written the code to draw the bounding box, I'm assuming that all I need to do is
recreate my map projection with the new center and dimension parameters. Is this correct?
Third, does IDL provide routines to convert screen coordinates to lat/lon in a given
projection (and vice-versa)?
Thanks alot,
Steve
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| Re: mapping/zooming [message #4892 is a reply to message #4804] |
Fri, 11 August 1995 00:00  |
svenw
Messages: 2
Registered: August 1995
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Junior Member |
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lena@jaameri.gsfc.nasa.gov (Jelena Marshak) writes:
>>
> I have produced a number of polar region data visualization plots and
> I don't see anything wrong with using
>
> map_set,90,/grid,/continent,/azimuthal,limit=[55,-180,90,180 ]
>
> It works on my computer.
>
> -Lena Marshak
Yes, you are right. I was wrong, but I have managed to get errors with certain
choices of parameters.
--
Sven Wallman http://www.update.uu.se/~svempa/
"Of what importance is mere money -
when there are worlds to be conquered -
people to be enslaved?" -- Doctor Doom
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| Re: mapping/zooming [message #4896 is a reply to message #4804] |
Fri, 11 August 1995 00:00 |
afl
Messages: 51
Registered: December 1994
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Member |
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In article <DELP.95Aug10103516@vexcel.vexcel.com>, delp@vexcel.com (Steve Delp)
writes:
|>
|> I'm trying to display a map of the north polar region.
|>
|> First, I'd like to have the window initialized with the continents between
|> 55-90
|> degrees lat displayed. I've tried
|>
|> map_set, 90, /grid, /continent, /azimuthal, limit=[55,-180,90,180]
This worked fine under IDL 4.0
Also, you may want to add the /iso keyword.
|> but I get floating point errors. Any ideas?
|>
|> Second, I'd like to draw a bounding box and have it's contents zoomed to fill
|> the display.
|> I've written the code to draw the bounding box, I'm assuming that all I need
|> to do is
|> recreate my map projection with the new center and dimension parameters. Is
|> this correct?
Sorry, but I don't understand what you are trying to do.
|> Third, does IDL provide routines to convert screen coordinates to lat/lon in
|> a given
|> projection (and vice-versa)?
|>
Look at the documentation for cursor.
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| Re: mapping/zooming [message #4897 is a reply to message #4804] |
Fri, 11 August 1995 00:00 |
svenw
Messages: 2
Registered: August 1995
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Junior Member |
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delp@vexcel.com (Steve Delp) writes:
> I'm trying to display a map of the north polar region.
> First, I'd like to have the window initialized with the continents between 55-90
> degrees lat displayed. I've tried
> map_set, 90, /grid, /continent, /azimuthal, limit=[55,-180,90,180]
> but I get floating point errors. Any ideas?
I'm no expert on projections, but you can't have the north pole as a center.
Try using 89 instead of 90, but the map will probably look somewhat distorted.
> Second, I'd like to draw a bounding box and have it's contents zoomed to fill the display.
> I've written the code to draw the bounding box, I'm assuming that all I need to do is
> recreate my map projection with the new center and dimension parameters. Is this correct?
I think so..
> Third, does IDL provide routines to convert screen coordinates to lat/lon in a given
> projection (and vice-versa)?
Yes, convert_coord does that. Just make sure where your point of origin is.
xv has its origin in the upper-left corner.
--
Sven Wallman http://www.update.uu.se/~svempa/
"Of what importance is mere money -
when there are worlds to be conquered -
people to be enslaved?" -- Doctor Doom
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