	T	X	Y	Z
NOAA NCEP-NCAR CDAS-1 DAILY Intrinsic sigma POT 9950 sigma[ X Y \| Z T]	M	M	M	M

This list of Active Objects appears in Expert Mode and are all the datasets that you currently have open. The last one (NOAA NCEP-NCAR CDAS-1 DAILY Intrinsic sigma POT) is the one you are currently working with.

means the grid is missing

M means the grids match

O means the grids are offset

S means the grids could match by sampling

D means the grids differ

Grid Comparisons

When you have multiple variables active, a table of grid comparisons appears to the right. These comparisons are between the last variable and all the others (so the last row always has matches or blanks).

NOAA NCEP-NCAR CDAS-1 DAILY Intrinsic sigma POT options

You have a number of options for working with this data set.

Data Viewers or
lets you interactively pick views of the data, starting with a color plot.
lets you interactively pick views of the data, starting with a contour plot.
lets you interactively pick views of the data, starting with a line plot.

You can also modify the dataset by

Data Selection which lets you pick out subsets of the data, and
Filters, which lets you perform calculations on the data.

You can also get the dataset output as

Dataset Documentation

We start with a quick reminder of where you are in the collection of datasets.

NCEP-NCAR^*

Potential temperature

As you go from left to right, the datasets listed get more and more specific, ending with the current dependent variable, NOAA NCEP-NCAR CDAS-1 DAILY Intrinsic sigma POT. Datasets with documentation are marked (*): the * links to the documentation directly.

Grids

Grids are the independent variables, i.e. what the current dependent variable (POT) depends on.

Time (time): grid: /T (days since 1948-01-01 12:00:00) ordered (1 Sep 1998) to (12 Apr 2024) by 1.0 N= 9356 pts :grid
Longitude (longitude): grid: /X (degree_east) periodic (0) to (2.5W) by 2.5 N= 144 pts :grid
Latitude (latitude): grid: /Y (degree_north) ordered (90N) to (90S) by 2.5 N= 73 pts :grid
Height: grid: /Z (sigma) ordered [ (9950)] :grid

Other Info

These are additional attributes, some of which can be used to change how the data is processed or displayed.

bufferwordsize: 4
calendar: standard
center: US Weather Service - National Met. Center
datatype: realarraytype
grib_name: POT
gribfield: 1
GRIBgridcode: 2
gribleveltype: 107
gribNumBits: 10
gribparam: 13
gribvariable: 13
missing_value: 9.99900026E20
PDS_TimeRANGE: 113
pointwidth: 1.0
process: (180) 62 wave triangular, 28 layer Spectral model from "Medium Range Forecast" run
PTVersion: 2
scale_max: 337.60001
scale_min: 208.2
standard_name: air_potential_temperature
subcenter: NCEP Ensemble Products
units: Kelvin_scale
standard units*: degree_Kelvin above 0

References

These are references to the literature for this dataset.

Kalnay, E., M. Kanamitsu, R. Kistler, W. Collins, D. Deaven, L. Gandin, M. Iredell, S. Saha, G. White, J. Woollen, Y. Zhu, A. Leetmaa, B. Reynolds, M. Chelliah, W. Ebisuzaki, W. Higgins, J. Janowiak, K. C. Mo, C. Ropelewski, J. Wang, R. Jenne, and D. Joseph. The NCEP/NCAR 40-Year Reanalysis Project. Bulletin of the American Meteorological Society, March, 1996