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Re: [las_users] cell corners of oceanic temperature data

Hi Shawn,

Thank you very much for pointing the problem out.  We have modified the script  for "ArcView Gridded" output to list the location of the corner of the grid cells.  The original values you saw on the output were acutally the location of the center of the grid cells.

As for the http tags at the bottom of the popup window of the ASCII text file, if you click the third link (Permanent link to this plot/data) at the bottom of the output window, you will get a new page with only data, no html tags.

Please let us know if you have further questions.


Shawn Saving wrote:
I originally posted this message on Feb 1, 2006 but have not seen it posted to the archive so I'm not sure that it was received.


I wonder if I have uncovered a problem with the "ArcView Gridded" output file format ("Full Region" option). Specifically, for the World Ocean Atlas 2001 1 x 1 degree Annual Means, temperature (mean, std dev, and std err) data, the  header of the generated ASCII files look like this:

ncols 360
nrows 180
xllcorner  -179.5000    yllcorner  -89.50000    cellsize   1.000000    nodata -9.9999998E+33

The reference locations say "xllcorner" and "yllcorner" yet the coordinates are -179.5 and -89.5 degrees, respeectively.  For 1 degree data it seems odd that the *corner* location would not be a whole number (i.e., -180 and -90).  For the coordinates listed, I'd expect the keywords to be "xllcenter" and "yllcenter".
Is this header correct or is it an error?

Also, and this is a minor point. When you actually download the "ArcView Gridded" file, you get a popup window of the ASCII text file that can be saved locally.  However, at the end of the file are three lines of html tags that have to be edited out of the file manually before it can be imported into ArcInfo.  It looks like this:

   Send all plot output to main window <http://ferret.pmel.noaa.gov/NVODS/servlets/data_popup?new_output_window=false>
Open a new window for each plot <http://ferret.pmel.noaa.gov/NVODS/servlets/data_popup?new_output_window=true&new_output_window_name=_blank>
Permanent link to this plot/data <http://ferret.pmel.noaa.gov/NVODS-bin/LASserver.pl?xml=%3C%3Fxml+version%3D%221.0%22%3F%3E%3ClasRequest+package%3D%22%22+href%3D%22file%3Alas.xml%22+%3E%3Clink+match%3D%22%2Flasdata%2Foperations%2Fdata%22+%2F%3E%3Cproperties+%3E%3Cferret+%3E%3 Csize+%3E.5%3C%2Fsize%3E%3Cformat+%3Earc%3C%2Fformat%3E%3Cexpression+%3E%3C%2Fexpression%3E%3C%2Fferret%3E%3C%2Fproperties%3E%3Cargs+%3E%3Clink+match%3D%22%2Flasdata%2Fdatasets%2Fwoa01_annual%2Fvariables%2Ft00mn1%22+%2F%3E%3Cregion+%3E%3Crange+low%3D%22-180.0%22+type%3D%22x%22+high%3D%22180.0%22+%2F%3E%3Crange+low%3D%22-89.5%22+type%3D%22y%22+high%3D%2289.5%22+%2F%3E%3Cpoint+v%3D%220%22+type%3D%22z%22+%2F%3E%3C%2Fregion%3E%3C%2Fargs%3E%3C%2FlasRequest%3E>

am I not properly downloading the file?  This is pretty annoying when downloading  a lot of data files.


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