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No, you have to put this in the ctl file exactly:<br>
<br>
Angstrom_Exponent_Land_QA_Mean=>AELQA_Mean 0 1, 1, 0,
0 Surface pressure [hPa]<br>
<br>
where the first variable is as defined in the HDF file, then a
=>, then the name you want to use. <br>
<br>
Jim<br>
<br>
<div class="moz-cite-prefix">On 10/13/12 5:31 PM, Ehsan Erfani
wrote:<br>
</div>
<blockquote
cite="mid:CAM8gLRCBbiqeva44SwNMCSJpjc_jtJ07Fp4NTjsQPX7dFdK-Uw@mail.gmail.com"
type="cite">Thank you Jim,<br>
<br>
But when I abbreviate the name of variable as:<br>
<br>
AELQA_Mean 0 1, 1, 0, 0 Surface pressure [hPa]<br>
<br>
I receive this errror message:<br>
<br>
Error: Variable aelqa_mean not in HDF-SDS file<br>
Data Request Error: Error for variable 'aelqa_mean'<br>
Error ocurred at column 1<br>
DISPLAY error: Invalid expression<br>
Expression = aelqa_mean<br>
<br>
<br>
Any idea?<br>
<br>
Thank you in advance,<br>
Ehsan<br>
<br>
<br>
<br>
<div class="gmail_quote">On Sat, Oct 13, 2012 at 7:46 PM, James T.
Potemra <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:jimp@hawaii.edu" target="_blank">jimp@hawaii.edu</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> Ehsan:<br>
<br>
I think there is a character limit on the variable name.
So, you have<br>
a variable called "Angstrom_Exponent_Land_QA_Mean", but
GrADS<br>
is looking for "angstrom_expone". Instead, you can map the
variable<br>
to something shorter (see <a moz-do-not-send="true"
href="http://www.iges.org/grads/gadoc/gadocindex.html"
target="_blank">http://www.iges.org/grads/gadoc/gadocindex.html</a>),<br>
e.g., in your ctl file:<br>
<br>
Angstrom_Exponent_Land_QA_Mean=>AELQA_Mean 0 1,
1, 0, 0 Surface pressure [hPa]<br>
<br>
then open and display "aelqa_mean", or whatever you call it.<br>
<br>
Jim
<div>
<div class="h5"><br>
<br>
<div>On 10/13/12 1:54 PM, Ehsan Erfani wrote:<br>
</div>
<blockquote type="cite"><font><span
style="font-size:10pt">Hi again,<br>
<br>
I attached an hdf file with a ctl (I downloaded
the data from Giovanni website and I wrote the
ctl). This time, the Grads can open the data, but
when I write the command: d
Angstrom_Exponent_Land_QA_Mean, This error message
appears:<br>
Syntax Error: Invalid Operand<br>
'angstrom_exponent' not a variable or function
name<br>
Error ocurred at column 1<br>
DISPLAY error: Invalid expression<br>
Expression = angstrom_exponent_land_qa_mean<br>
<br>
But, I am sure the name of variable is true. I
checked it by HDFView and this is the information
from HDFView:<br>
Angstrom_Exponent_Land_QA_Mean (720, 2)<br>
32-bit floating-point, 180 x 360<br>
Number of attributes = 18<br>
_FillValue = -9999.0<br>
QA_Useful_Flag_Bit = 0<br>
Quality_Assurance_Data_Set =
Quality_Assurance_Land<br>
scale_factor = 1.0<br>
QA_Value_Start_Bit = 1<br>
add_offset = 0.0<br>
long_name = Angstrom exponent (Land) for
0.47 and 0.66 microns: Level-2 QA Weighted Mean<br>
Statistic_Type = Simple<br>
units = unitless<br>
QA_Byte = 0<br>
Aggregation_Data_Set = None<br>
valid_range = -500,5000<br>
Included_Level_2_Nighttime_Data = False<br>
Derived_From_Level_2_Data_Set =
Angstrom_Exponent_Land<br>
QA_Value_Num_Bits = 3<br>
Level_2_Pixel_Values_Read_As = Real<br>
structureType = Grid<br>
unitsCategory = exponent<br>
<br>
Hope these help to solve the problems. I
appreciate all your consideration and help.<br>
<br>
Best regards,<br>
Ehsan</span></font><br>
<br>
<div class="gmail_quote">On Sat, Oct 13, 2012 at 1:26
AM, Ehsan Erfani <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:e.erfani81@gmail.com"
target="_blank">e.erfani81@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<font><span style="font-size:10pt">1- I used
grads-2.0.a3.oga.1.win32_superpack (GrADS
OPenNDAP). Also, I tried
grads-2.0.1.oga.1-win32_superpack. <br>
2- Both of them are opengrads and run in
windows.<br>
3- First, I want to open hdf data without ctl
(I have a lot of data and they do not have
similar variables). So, I consider using
sdfopen to open the files.<br>
</span></font><br>
<font><span style="font-size:10pt"><font><span
style="font-size:10pt">4- By using
sdfopen, I received these error message
for the above grads versions,
respectively:
<div><br>
<br>
"gradsdf : SDF file has no discernable X
coordinate."<br>
<br>
</div>
"gadsdf: SDF file has no discernable X
coordinate.<br>
To open this file with GrADS, use a
descriptor file with an XDEF entry."</span></font><br>
<br>
5- I used MODIS hdf files. A typical name of
the files can be
"MOD08_D3.A2011152.051.2011153120457.hdf". I
wanted to plot 550 nm AOD and deep blue AOD.
These data are typical satellite data from
terra or aqua.<br>
I do not have access to linux to provide
ncdump data. Anyway, the message would be very
long and I write some first lines (containing
the dimension and grid data) from the HDF
Import Tool and write the full message in the
end:<br>
</span></font><font><span style="font-size:10pt">Name:
MERRA200.prod.assim.tavg1_2d_lnd_Nx.20000601.hdf
HDFEOSVersion: HDFEOS_V2.14 StructMetadata.0:
GROUP=SwathStructure END_GROUP=SwathStructure
GROUP=GridStructure GROUP=GRID_1
GridName="EOSGRID" XDim=540
YDim=361
UpperLeftPointMtrs=(-180000000.000000,90000000.000000)
LowerRightMtrs=(180000000.000000,-90000000.000000)
Projection=GCTP_GEO
GridOrigin=HDFE_GD_LL
GROUP=Dimension
OBJECT=Dimension_1
DimensionName="TIME"
Size=24
END_OBJECT=Dimension_1
END_GROUP=Dimension
GROUP=DataField
OBJECT=DataField_1
DataFieldName="GRN"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim") 3- I used
sdfopen command to open them.<br>
<br>
Final word:<br>
I know that the problem can be due to the
dimension, however the dimension is defined in
the data by XDim and YDim, Time. I wonder
does anyone successfully use GrADS to open hdf
files by sdfopen command. Is a certain version
of GrADS recommended to do this?<br>
<br>
Thank you in advance,<br>
Ehsan<br>
<br>
</span></font><br>
<div class="gmail_quote">
<div>On Fri, Oct 12, 2012 at 10:53 AM, Jennifer
Adams <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:jma@cola.iges.org"
target="_blank">jma@cola.iges.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">Your post
is missing the following information:
<div>1. The version of GrADS you are
running</div>
<div>2. What operating system you're
running it on</div>
<div>3. The contents of your ctl file</div>
<div>4. The error message you get when you
try to open your ctl file</div>
<div>5. More information about the grid in
your MODIS file, especially the output
from ncdump (which is often enabled to
handle HDF files)</div>
<div> Nobody can help until you provide
these things. </div>
<div>--Jennifer</div>
<div><br>
</div>
<div><br>
</div>
</div>
</blockquote>
</div>
<div><br>
<br>
Name:
MERRA200.prod.assim.tavg1_2d_lnd_Nx.20000601.hdf
HDFEOSVersion: HDFEOS_V2.14 StructMetadata.0:
GROUP=SwathStructure END_GROUP=SwathStructure
GROUP=GridStructure GROUP=GRID_1
GridName="EOSGRID" XDim=540
YDim=361
UpperLeftPointMtrs=(-180000000.000000,90000000.000000)
LowerRightMtrs=(180000000.000000,-90000000.000000)
Projection=GCTP_GEO
GridOrigin=HDFE_GD_LL
GROUP=Dimension
OBJECT=Dimension_1
DimensionName="TIME"
Size=24
END_OBJECT=Dimension_1
END_GROUP=Dimension
GROUP=DataField
OBJECT=DataField_1
DataFieldName="GRN"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_1
OBJECT=DataField_2
DataFieldName="LAI"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_2
OBJECT=DataField_3
DataFieldName="GWETROOT"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_3
OBJECT=DataField_4
DataFieldName="GWETTOP"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_4
OBJECT=DataField_5
DataFieldName="TPSNOW"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_5
OBJECT=DataField_6
DataFieldName="TUNST"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_6
OBJECT=DataField_7
DataFieldName="TSAT"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_7
OBJECT=DataField_8
DataFieldName="TWLT"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_8
OBJECT=DataField_9
DataFieldName="PRECSNO"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_9
OBJECT=DataField_10
DataFieldName="PRECTOT"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_10
OBJECT=DataField_11
DataFieldName="SNOMAS"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_11
OBJECT=DataField_12
DataFieldName="SNODP"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_12
OBJECT=DataField_13
DataFieldName="EVPSOIL"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_13
OBJECT=DataField_14
DataFieldName="EVPTRNS"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_14
OBJECT=DataField_15
DataFieldName="EVPINTR"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_15
OBJECT=DataField_16
DataFieldName="EVPSBLN"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_16
OBJECT=DataField_17
DataFieldName="RUNOFF"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_17
OBJECT=DataField_18
DataFieldName="BASEFLOW"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_18
OBJECT=DataField_19
DataFieldName="SMLAND"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_19
OBJECT=DataField_20
DataFieldName="FRUNST"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_20
OBJECT=DataField_21
DataFieldName="FRSAT"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_21
OBJECT=DataField_22
DataFieldName="FRSNO"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_22
OBJECT=DataField_23
DataFieldName="FRWLT"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_23
OBJECT=DataField_24
DataFieldName="PARDF"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_24
OBJECT=DataField_25
DataFieldName="PARDR"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_25
OBJECT=DataField_26
DataFieldName="SHLAND"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_26
OBJECT=DataField_27
DataFieldName="LHLAND"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_27
OBJECT=DataField_28
DataFieldName="EVLAND"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_28
OBJECT=DataField_29
DataFieldName="LWLAND"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_29
OBJECT=DataField_30
DataFieldName="SWLAND"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_30
OBJECT=DataField_31
DataFieldName="GHLAND"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_31
OBJECT=DataField_32
DataFieldName="TWLAND"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_32
OBJECT=DataField_33
DataFieldName="TELAND"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_33
OBJECT=DataField_34
DataFieldName="WCHANGE"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_34
OBJECT=DataField_35
DataFieldName="ECHANGE"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_35
OBJECT=DataField_36
DataFieldName="SPLAND"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_36
OBJECT=DataField_37
DataFieldName="SPWATR"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_37
OBJECT=DataField_38
DataFieldName="SPSNOW"
DataType=DFNT_FLOAT32
DimList=("TIME","YDim","XDim")
END_OBJECT=DataField_38
OBJECT=DataField_39
DataFieldName="XDim"
DataType=DFNT_FLOAT64
DimList=("XDim")
END_OBJECT=DataField_39
OBJECT=DataField_40
DataFieldName="YDim"
DataType=DFNT_FLOAT64
DimList=("YDim")
END_OBJECT=DataField_40
OBJECT=DataField_41
DataFieldName="Time"
DataType=DFNT_FLOAT64
DimList=("TIME")
END_OBJECT=DataField_41
END_GROUP=DataField
GROUP=MergedFields
END_GROUP=MergedFields END_GROUP=GRID_1
END_GROUP=GridStructure GROUP=PointStructure
END_GROUP=PointStructure END <br>
</div>
<div>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">
<div>
<div>
<div>
<div>
<div>On Oct 11, 2012, at 9:53 PM,
Ehsan Erfani wrote:</div>
<br>
</div>
</div>
<blockquote type="cite">
<div>
<div>Hello,<br>
<br>
I cannot open MODIS (Moderate
Resolution Imaging
Spectroradiometer) HDF files by
grads. I receive this message
when I use the sdfopen:<br>
"gradsdf : SDF file has no
discernable X coordinate."<br>
<br>
I tried to open by xdfopen
without any success. Also, I
made a ctl but again it did not
help. I appreciate it if you let
me know how to open hdf files by
GrADS. Thank you.<br>
<br>
Best regards,<br>
</div>
</div>
Ehsan
_______________________________________________<br>
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target="_blank">gradsusr@gradsusr.org</a><br>
<a moz-do-not-send="true"
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<br>
<div> <span style="border-spacing:0px
0px;text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:auto;font-style:normal;font-weight:normal;line-height:normal;border-collapse:separate;text-transform:none;font-size:12px;white-space:normal;font-family:Helvetica;word-spacing:0px"><span
style="border-spacing:0px
0px;text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:auto;font-style:normal;font-weight:normal;line-height:normal;border-collapse:separate;text-transform:none;font-size:12px;white-space:normal;font-family:Helvetica;word-spacing:0px"><span
style="border-spacing:0px
0px;text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:auto;font-style:normal;font-weight:normal;line-height:normal;border-collapse:separate;text-transform:none;font-size:12px;white-space:normal;font-family:Helvetica;word-spacing:0px">
<div> --</div>
<div>Jennifer M. Adams</div>
<div>IGES/COLA</div>
<div>4041 Powder Mill Road,
Suite 302</div>
<div>Calverton, MD 20705</div>
<div><a moz-do-not-send="true"
href="mailto:jma@cola.iges.org"
target="_blank">jma@cola.iges.org</a></div>
<div><br>
</div>
<br>
</span></span></span> </div>
<br>
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