Hi,
this is my first time using netcdf data and gdal library on Ubuntu 12.04
I have downloaded a subsetted monthly precipitation dataset from:
http://www.esrl.noaa.gov/psd/data/gridded/data.cmap.html
I want to create timelines of a few gridcells (covering germany)
As I understand, before converting bands to raster-images by
gdal_translate one has to extract information from the subdatasets.
My Problem is:
using
gdalinfo X139.14.20.244.217.3.48.41.nc > gdalinfo.txt
No subdatasets appear. I would have expected something like to the
follwing to be included in the output of gdalinfo:
SUBDATASET_1_NAME=NETCDF:...
SUBDATASET_1_DESC=...
SUBDATASET_2_NAME=...
SUBDATASET_2_DESC=...
SUBDATASET_3_NAME=...
SUBDATASET_3_DESC=...
Instead the output is as following:
Driver: netCDF/Network Common Data Format
Files: X139.14.20.244.217.3.47.29.nc
Size is 6, 5
Coordinate System is `'
Origin = (2.500000000000000,57.500000000000000)
Pixel Size = (2.500000000000000,-2.500000000000000)
Metadata:
lat#actual_range={ 56.25, 46.25 }
lat#axis=Y
lat#long_name=Latitude
lat#standard_name=latitude
lat#units=degrees_north
lon#actual_range={ 3.75, 16.25 }
lon#axis=X
lon#long_name=Longitude
lon#standard_name=longitude
lon#units=degrees_east
NC_GLOBAL#Conventions=COARDS
NC_GLOBAL#documentation=http://www.esrl.noaa.gov/psd/data/gridded/data.cmap.html
NC_GLOBAL#history=Tue Aug 6 03:47:30 2013: ncks -O -d
lat,46.000000,57.000000 -d lon,3.000000,17.000000 -d time,0,2401
/Datasets/cmap/std/precip.pentad.mean.nc
/Public/www/X139.14.20.244.217.3.47.29.nc
Created by CAS 09/2012 using Version 1201
NC_GLOBAL#platform=Analyses
NC_GLOBAL#references=http://www.esrl.noaa.gov/psd/data/gridded/data.cmap.html
NC_GLOBAL#source=ftp ftp.cpc.ncep.noaa.gov precip/cmap/pentad
NC_GLOBAL#title=CPC Merged Analysis of Precipitation Pentad data
(excludes NCEP Reanalysis I)
NC_GLOBAL#Version=V1201
precip#actual_range={ 0, 25.07 }
precip#add_offset=0
precip#dataset=CPC Merged Analysis of Precipitation Standard
precip#least_significant_digit=2
precip#level_desc=Surface
precip#long_name=Average Pentad Rate of Precipitation
precip#missing_value=-9.96921e+36
precip#parent_stat=Mean
precip#precision=2
precip#scale_factor=1
precip#statistic=Pentad Mean
precip#units=mm/day
precip#valid_range={ 0, 250 }
precip#var_desc=Precipitation
time#actual_range={ 1569072, 1857384 }
time#avg_period=0000-01-00 00:00:00
time#axis=T
time#delta_t=0000-00-05 00:00:00
time#long_name=Time
time#standard_name=time
time#units=hours since 1800-01-01 00:00:0.0
Corner Coordinates:
Upper Left ( 2.5000000, 57.5000000)
Lower Left ( 2.5000000, 45.0000000)
Upper Right ( 17.5000000, 57.5000000)
Lower Right ( 17.5000000, 45.0000000)
Center ( 10.0000000, 51.2500000)
Band 1 Block=6x1 Type=Float32, ColorInterp=Undefined
NoData Value=-9.96920996838686905e+36
Metadata:
actual_range={ 0, 25.07 }
add_offset=0
dataset=CPC Merged Analysis of Precipitation Standard
least_significant_digit=2
level_desc=Surface
long_name=Average Pentad Rate of Precipitation
missing_value=-9.96921e+36
NETCDF_DIMENSION_time=1569072
NETCDF_time_units=hours since 1800-01-01 00:00:0.0
NETCDF_VARNAME=precip
parent_stat=Mean
precision=2
scale_factor=1
statistic=Pentad Mean
units=mm/day
valid_range={ 0, 250 }
var_desc=Precipitation
And the next bands following.
---
Here is the metadata:
---
Metadata for /Public/www/X139.14.20.244.217.3.47.29.nc
Dimensions:
time 2402
lat 5
lon 6
precip 2402 5 6
Variables:
time
long_name Time
avg_period 0000-01-00 00:00:00
axis T
standard_name time
delta_t 0000-00-05 00:00:00
actual_range 1979-01-01 00:00:00 2011-11-22 00:00:00
units hours since 1800-01-01 00:00:0.0
lat
long_name Latitude
axis Y
standard_name latitude
actual_range 56.25 46.25
units degrees_north
lon
long_name Longitude
axis X
standard_name longitude
actual_range 3.75 16.25
units degrees_east
precip
parent_stat Mean
long_name Average Pentad Rate of Precipitation
valid_range 0 250
least_significant_digit 2
level_desc Surface
dataset CPC Merged Analysis of Precipitation
Standard
missing_value -9.96920996838687e+36
statistic Pentad Mean
actual_range 0 25.0699996948242
var_desc Precipitation
add_offset 0
precision 2
units mm/day
scale_factor 1
Global Attributes:
source
ftp ftp.cpc.ncep.noaa.gov precip/cmap/pentad
Version
V1201
history
Tue Aug 6 03:47:30 2013: ncks -O -d lat,46.000000,57.000000 -d
lon,3.000000,17.000000 -d time,0,2401
/Datasets/cmap/std/precip.pentad.mean.nc
/Public/www/X139.14.20.244.217.3.47.29.nc Created by CAS 09/2012 using
Version 1201
references
http://www.esrl.noaa.gov/psd/data/gridded/data.cmap.html
documentation
http://www.esrl.noaa.gov/psd/data/gridded/data.cmap.html
platform
Analyses
title
CPC Merged Analysis of Precipitation Pentad data (excludes NCEP
Reanalysis I)
Conventions
COARDS
---
Any advise on how to proceed to create rasters and timelines from this
would be very appreciated. Probably something obvious I do not see.
Thanks,
Gunnar
_______________________________________________
gdal-dev mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/gdal-dev
