Re: Basic queries

R/Sir

This is really good in NCL that it can support any hdf-5 product.
I was expecting that I wont have to assign names and units to the lat/lon
datasets which are
already there in the product. Do you mean to say, that we would have to
assign that
as show in the examples.
I can upload a sample hdf-5 product. Give me sometime.
Contouring is as much as I believe is a vector plot with lines joining the
same values,
while raster plot is an image display. Technically speaking, in graphics we
generally use
texture for displaying images while we use geometry for drawing contours.
Anyways thanks for all the help.
Any mention about adding header to the display?
regards
Ghansham

On Mon, Jun 18, 2012 at 11:56 PM, Mary Haley <haley@ucar.edu> wrote:

>
> On Jun 18, 2012, at 11:17 AM, ghansham sangar wrote:
>
> > R/sir,
> > I've a few queries:
> > 1. How to display CF complaint hdf5 product in NCL?The product
> > contains geostationary satellite images with 2D lat/lon coordinate
> > variables(refer CF 1.5 complaince document for details).In context of
> > this, can we set up the display projection according to that?
>
> > 2. How to display satellite data as an image? I've seen displaying as
> > contours but not image.
> > 3. Can we set up the size of display? And add a header at the top of
> display?
>
>
> Dear Ghansham,
>
> I'll point you to some examples of plotting HDF data shortly.
>
> 1) NCL doesn't care if your NetCDF files are CF compliant, although it
> certainly doesn't hurt.
>
> The display projection depends on your data, and what map projection it
> was generated
> on, if any. If you are able to provide lat/lon values for your data, then
> you may be able to
> put it on several different map projections.
>
> 2) I'm not sure what you mean by displaying data as contours versus an
> image. Generally,
> a "raster image" can be technically considered a contour plot.
>
> 3) If you send the output to a PNG file, then you can set the size by
> setting special "wkWidth" and "wkHeight" resources.
>
> To see some examples of plotting HDF data, please see:
>
> http://www.ncl.ucar.edu/Applications/HDF.shtml
>
> Most of these examples are generated with the special "cnFillMode"
> resource set to "RasterFill". I believe this is what you are referring to
> as an "image".
>
> To change the output to go to a PNG file instead of a PostScript or PDF
> file, change the first argument of "gsn_open_wks" to "png". To further
> control the size of the PNG file, do something like this:
>
> pltType = "png"
> pltType@wkWidth = 1000
> pltType@wkHeight = 1000
>
> wks = gsn_open_wks(pltType, "example")
>
> The above code will send the graphical output to a PNG file called
> "example.png".
>
> Note that the graphics are always drawn to a square. If you try to set
> wkWidth and wkHeight to a non-square, then NCL internally will set the
> output to a square that is the largest of the two values.
>
> --Mary
>
> >
> > Regards
> > Ghansham
> > _______________________________________________
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>
>

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Received on Mon Jun 18 19:35:56 2012