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HI Mike,<br>
<br>
I believe the x,y are UTM (Universal Transverse Mercator). You are
seeing the complete "full disk" image, but you<br>
won't be able to specify lat/lon directly. I think you'll have to
either use an external tool (e.g., GDAL) to convert<br>
the file first, or try convert your lat/lon ranges to UTM then
specify them. For example,<br>
<br>
set x = 10000 12000<br>
set y = 9000 11000<br>
<br>
gives a plot just south of the equator. Note this is a really
high-res image, so it will take a long time to render<br>
the entire thing (22000 by 22000) if it does it at all (you might
get an "Out of buffer space").<br>
<br>
<br>
Jim<br>
<br>
<div class="moz-cite-prefix">On 7/25/15 6:18 PM, Mike Manning wrote:<br>
</div>
<blockquote cite="mid:55B45F9E.3060302@bsch.com.au" type="cite">
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Hi Jim,<br>
<br>
It's the sample Himawari-8 data on the BOM site: <a
moz-do-not-send="true" class="moz-txt-link-freetext"
href="ftp://ftp.bom.gov.au/anon/sample/catalogue/Satellite/IDE00220.201507140300.nc"><a class="moz-txt-link-freetext" href="ftp://ftp.bom.gov.au/anon/sample/catalogue/Satellite/IDE00220.201507140300.nc">ftp://ftp.bom.gov.au/anon/sample/catalogue/Satellite/IDE00220.201507140300.nc</a></a>
<br>
<br>
Cheers, Mike<br>
<br>
<div class="moz-cite-prefix">On 25/07/2015 2:56 PM, James T.
Potemra wrote:<br>
</div>
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Hi Mike,<br>
<br>
From where are you getting these files? The x,y coordinates are
in meters and not degrees. Without specifying the<br>
lat/lon it looks like you are getting the full disk image. The
netcdf files at JMA appear to be in lat/lon<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://www.data.jma.go.jp/mscweb/en/himawari89/space_segment/sample_netcdf.html">http://www.data.jma.go.jp/mscweb/en/himawari89/space_segment/sample_netcdf.html</a>,
but as yet they only<br>
seem to have the Japan-centric images.<br>
<br>
Jim<br>
<br>
<div class="moz-cite-prefix">On 7/23/15 8:00 PM, Mike Manning
wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m trying to display a Himawari-8
NetCDF file in Grads – here are the attributes of the nc
file:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">dimensions:<o:p></o:p></p>
<p class="MsoNormal"> time = UNLIMITED ; // (1
currently)<o:p></o:p></p>
<p class="MsoNormal"> y = 22000 ;<o:p></o:p></p>
<p class="MsoNormal"> x = 22000 ;<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">variables:<o:p></o:p></p>
<p class="MsoNormal"> double time(time) ;<o:p></o:p></p>
<p class="MsoNormal"> time:coordinates =
"time" ;<o:p></o:p></p>
<p class="MsoNormal"> time:long_name = "time"
;<o:p></o:p></p>
<p class="MsoNormal"> time:standard_name =
"time" ;<o:p></o:p></p>
<p class="MsoNormal"> time:units = "seconds
since 1970-01-01 00:00:00" ;<o:p></o:p></p>
<p class="MsoNormal"> time:calendar =
"standard" ;<o:p></o:p></p>
<p class="MsoNormal"> time:axis = "T" ;<o:p></o:p></p>
<p class="MsoNormal"> time:unlimited = "True"
;<o:p></o:p></p>
<p class="MsoNormal"> double y(y) ;<o:p></o:p></p>
<p class="MsoNormal"> y:coordinates = "y" ;<o:p></o:p></p>
<p class="MsoNormal"> y:long_name =
"projection_y_coordinate" ;<o:p></o:p></p>
<p class="MsoNormal"> y:standard_name =
"projection_y_coordinate" ;<o:p></o:p></p>
<p class="MsoNormal"> y:units = "m" ;<o:p></o:p></p>
<p class="MsoNormal"> y:axis = "Y" ;<o:p></o:p></p>
<p class="MsoNormal"> double x(x) ;<o:p></o:p></p>
<p class="MsoNormal"> x:coordinates = "x" ;<o:p></o:p></p>
<p class="MsoNormal"> x:long_name =
"projection_x_coordinate" ;<o:p></o:p></p>
<p class="MsoNormal"> x:standard_name =
"projection_x_coordinate" ;<o:p></o:p></p>
<p class="MsoNormal"> x:units = "m" ;<o:p></o:p></p>
<p class="MsoNormal"> x:axis = "X" ;<o:p></o:p></p>
<p class="MsoNormal"> float geostationary ;<o:p></o:p></p>
<p class="MsoNormal"> geostationary:proj4 =
"+proj=geos +lon_0=140.7 +h=35785863 +x_0=0 +y_0=0
+a=6378137 +b=6356752.3 +units=m +no_defs " ;<o:p></o:p></p>
<p class="MsoNormal"> geostationary:proj_name
= "GEOS141" ;<o:p></o:p></p>
<p class="MsoNormal">
geostationary:grid_mapping_name = "geostationary" ;<o:p></o:p></p>
<p class="MsoNormal">
geostationary:longitude_of_projection_origin = 140.7 ;<o:p></o:p></p>
<p class="MsoNormal">
geostationary:perspective_point_height = 35785863. ;<o:p></o:p></p>
<p class="MsoNormal">
geostationary:satellite_height = 35785863. ;<o:p></o:p></p>
<p class="MsoNormal">
geostationary:semi_major_axis = 6378137. ;<o:p></o:p></p>
<p class="MsoNormal">
geostationary:semi_minor_axis = 6356752.3 ;<o:p></o:p></p>
<p class="MsoNormal">
geostationary:sweep_angle_axis = "y" ;<o:p></o:p></p>
<p class="MsoNormal">
geostationary:GeoTransform = -5500000., 500., 0.,
5500000., 0., -500. ;<o:p></o:p></p>
<p class="MsoNormal">
geostationary:spatial_ref =
"PROJCS[\"unnamed\",GEOGCS[\"unnamed
ellipse\",DATUM[\"unknown\",SPHEROID[\"unnamed\",6378137,298.2570248822722]],PRIMEM[\"Greenwich\",0],UNIT[\"degree\",0.0174532925199433]],PROJECTION[\"Geostationary_Satellite\"],PARAMETER[\"central_meridian\",140.7],PARAMETER[\"satellite_height\",35785863],PARAMETER[\"false_easting\",0],PARAMETER[\"false_northing\",0]]"
;<o:p></o:p></p>
<p class="MsoNormal"> double scan_line_time(y) ;<o:p></o:p></p>
<p class="MsoNormal"> scan_line_time:units =
"seconds since 2015-07-14 03:00:00" ;<o:p></o:p></p>
<p class="MsoNormal">
scan_line_time:long_name = "estimated scan line time" ;<o:p></o:p></p>
<p class="MsoNormal"> scan_line_time:calendar
= "standard" ;<o:p></o:p></p>
<p class="MsoNormal">
scan_line_time:coordinates = "y" ;<o:p></o:p></p>
<p class="MsoNormal"> float channel_0003_brf(time, y,
x) ;<o:p></o:p></p>
<p class="MsoNormal">
channel_0003_brf:_FillValue = 1.e+20f ;<o:p></o:p></p>
<p class="MsoNormal">
channel_0003_brf:least_significant_digit = 2s ;<o:p></o:p></p>
<p class="MsoNormal">
channel_0003_brf:algorithm_name = "channel_3_brf" ;<o:p></o:p></p>
<p class="MsoNormal">
channel_0003_brf:central_wavelength = 6.3915e-07 ;<o:p></o:p></p>
<p class="MsoNormal">
channel_0003_brf:comment = "bidirectional reflectance
factor observed by the Advanced Himawari Imager at 0.64 um
(Band 3)" ;<o:p></o:p></p>
<p class="MsoNormal">
channel_0003_brf:long_name = "bidirectional reflectance
factor for channel 3 at 0.64 um" ;<o:p></o:p></p>
<p class="MsoNormal"> channel_0003_brf:units
= "1" ;<o:p></o:p></p>
<p class="MsoNormal">
channel_0003_brf:valid_max = 1.2 ;<o:p></o:p></p>
<p class="MsoNormal">
channel_0003_brf:valid_min = 0. ;<o:p></o:p></p>
<p class="MsoNormal">
channel_0003_brf:coordinates = "time y x" ;<o:p></o:p></p>
<p class="MsoNormal">
channel_0003_brf:grid_mapping = "geostationary" ;<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I made a sample script as follows:<o:p></o:p></p>
<p class="MsoNormal">'sdfopen testfile.nc'<o:p></o:p></p>
<p class="MsoNormal">'d channel_0003_br'<o:p></o:p></p>
<p class="MsoNormal">'printim satimage.png'<o:p></o:p></p>
<p class="MsoNormal">'quit'<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Ideally I want to be able to set a
lat/lon region, but when I specify any lat/lon region I
just get a chart with a red output. When I don’t specify
any lat/lon output at all, I get a bizzare chart (I’m
guessing because it’s using x and y coordinates instead of
lat/lon?) Is there any way to correctly get this to
display in grads at all?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Cheers, Mike<o:p></o:p></p>
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