Description Usage Arguments Details Value References Examples
Finds all the mappings for a set of observations and predictions often over multiple years
1 2 3 4 | create_mapping(start_year, end_year, obs_start_year, pred_start_year,
observed, predicted, reg_info, month, level, dat_type_obs, dat_type_pred,
plotting = FALSE, obs_only = FALSE, pred_only = FALSE, nX = 304,
nY = 448, xmn = -3850, xmx = 3750, ymn = -5350, ymx = 5850)
|
start_year |
first year to be mapped |
end_year |
last year to be mapped |
obs_start_year |
year in which observation array starts |
pred_start_year |
year in which prediction array starts |
observed |
array of observed values of dimension year x longitude x latitude |
predicted |
array of predicted values of dimension year x longitude x latitude |
reg_info |
a |
month |
month under consideration |
level |
concentration level for which to build contour |
dat_type_obs |
string of either "bootstrap" or "simple" indicating the file type of the observation (see details) |
dat_type_pred |
string of either "gfdl" or "simple" indicating the file type of the prediction (see details) |
plotting |
boolean indicatng whether maps should be plotted (defaults to false) |
obs_only |
indicator to run mapping only for observations |
pred_only |
indicator to run mapping only for predictions |
nX |
dimension in the x (defaults to value for Northern Polar stereographic grid: 304) |
nY |
dimension in the y (defaults to value for Northern Polar stereographic grid: 448) |
xmn |
min x value (defaults to value for Northern Polar stereographic grid: -3850) |
xmx |
max x value (defaults to value for Northern Polar stereographic grid: 3750) |
ymn |
min y value (defaults to value for Northern Polar stereographic grid: -5350) |
ymx |
max y value (defaults to value for Northern Polar stereographic grid: 5850) |
The object maps
is obtained from running the
create_mapping
function. It is a list of four objects. The
first two items in the list, start_year
and end_year
,
give the first and last year that were mapped. The second two items,
obs_list
and pred_list
, are lists of arrays with one
3-dimensional array for each region. The first dimension is for the
year. The other two dimensions are for the fixed points'
y-coordinates, the mapped points' x-coordinates, the mapped points'
y-coordinates, the length of the mapping vectors in the x-direction,
the length of the vectors in the y-direction, and the angles of the
mapping vectors.
For dat_type_obs = "simple"
and dat_type_pred = "simple"
the values in the observed
and predicted
arrays are
indicators of whether the grid box contains ice (1: ice-covered,
0: no ice, NA: land). If datTypePred = "gfdl"
or
dat_type_obs = "bootstrap"
, the values in the observed
and predicted
arrays correspond to the raw ice concentrations
values observed or predicted (including indicators for missing data,
land etc.). If datTypePred = "gfdl"
, the predictions are
formatted as in the CM2.5 Forecast-oriented Low-Ocean Resolution
(FLOR) model produced by the National Oceanic and Atmospheric
Administration’s Geophysical Fluid Dynamics Laboratory and converted
to a Polar Stereographic grid (Vecchi et al. 2014; Msadek et al. 2014).
If datTypeObs = "bootstrap"
the array values are assumed to be
from the monthly sea ice concentration obtained from the National
Aeronautics and Space Administration (NASA) satellites Nimbus-7 SMMR
and DMSP SSM/I-SSMIS and processed by the bootstrap algorithm.
Weights for converting to a polar stereograhic grid were obtained
from the spherical coordinate remapping and interpolation package
(SCRIP) (Jones 1997).
map
object (see details)
Comiso, J., 2017: Bootstrap sea ice concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS. version 3. Boulder, Colorado USA: NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/7Q8HCCWS4I0R
CM2.5 Forecast-oriented Low-Ocean Resolution (FLOR) model: Vecchi, Gabriel A., et al. "On the seasonal forecasting of regional tropical cyclone activity." Journal of Climate 27.21 (2014): 7994-8016.
Msadek, R., et al. "Importance of initial conditions in seasonal predictions of Arctic sea ice extent." Geophysical Research Letters 41.14 (2014): 5208-5215.
National Center for Atmospheric Research, 2017: Earth system grid at NCAR. https://www.earthsystemgrid.org/home.html.
Jones, P.W. "A user’s guide for SCRIP: A spherical coordinate remapping and interpolation package." Los Alamos National Laboratory, Los Alamos, NM (1997).
1 2 3 4 5 6 7 | ## Not run:
create_mapping(start_year = 1981, end_year = 1981, obs_start_year = 1981,
pred_start_year = 1980, observed = obsFeb19811982,
predicted = emFeb19811982, reg_info = reg_info, month = 2,
level = 15, dat_type_obs = "bootstrap", dat_type_pred = "gfdl",
plotting = TRUE)
## End(Not run)
|
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