[las_users] cell corners of oceanic temperature data

[Shawn Saving <saving@xxxxxxxxxx>]

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:

.
.
.
-9.9999998E+33
-9.9999998E+33
-9.9999998E+33
-9.9999998E+33
-9.9999998E+33
   
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%3Csize+%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.

thanks
Shawn