Hi Marcelo, Thredds team,
We encounter the same issue at CLS! But our idea was more on the integer
management. When a variable is a short or float, the tests we've done was ok.
Waiting for the thredds opinion.
Regards
Tony
Tony Jolibois
C.L.S.
Direction Océanographie Spatiale
Parc Technologique du Canal
8-10, rue Hermès
31520 Ramonville St-Agne, FRANCE
Tel: +33 (0)5 61 39 37 97 Fax: +33 (0)5 61 39 37 82
-----Message d'origine-----
De : thredds-bounces@xxxxxxxxxxxxxxxx [mailto:thredds-bounces@xxxxxxxxxxxxxxxx]
De la part de marceloandrioni@xxxxxxxxxxxxxxxx
Envoyé : jeudi 29 mai 2014 00:20
À : thredds@xxxxxxxxxxxxxxxx
Objet : [thredds] Problem with ncss and wms (probably scale_factor)
Hello, I am having some problems displaying data from CLS altimetry files. The
data is stored as integer to save space and has a scale_factor:
int sla(time, lat, lon) ;
sla:_FillValue = -2147483647 ;
sla:long_name = "Sea Level Anomalies" ;
sla:standard_name = "sea_surface_height_above_sea_level" ;
sla:units = "m" ;
sla:scale_factor = 0.0001 ;
I am not sure I can send the file for copyright reasons, but anyone with a
subscription to CLS can get in
ftp.aviso.altimetry.fr/donnees/ftpsedr/DUACS/global/delayed-time/grids/msla/all-sat-merged/h/1993/dt_global_allsat_msla_h_19930101_20140106.nc.gz
when seeing the data using the Opendap protocol everything works and the values
over land are show as missing. But when using NetcdfSubset or the Godiva2
viewer (that makes WMS requests) the values over land are show as valid but
with two different values: -2.147e+5 in Godiva2/WMS and -2.147483647e+9 in NCSS.
I think this is a similar problem as the one report by Peter Vodden in
http://www.unidata.ucar.edu/mailing_lists/archives/thredds/2014/msg00002.html
I tried changing the _FillValue (to -2.147e+5 and -2.147483647e+9) using ncml
but that only made the Opendap start showing the land values as non-missing.
Also tried adding attribute valid_min and valid_max but that didn't work also.
Any ideas?
Thank you.
--
| Marcelo Andrioni
| Environmental Engineer
| PETROBRAS (Ocean Engineering Technology Department) Av. Horácio
| Macedo, 950 - Cidade Universitária ZIP 21941-915 - Ilha do Fundão -
| Rio de Janeiro - RJ - Brazil marceloandrioni@xxxxxxxxxxxxxxxx
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