SYNOPSIS

pkkalman [options]

DESCRIPTION

pkkalman will complement a time series of observations (option -obs) at fine spatial resolution. A data assimilation technique based on a Kalman filter is hereby used. The data at fine spatial resolution are assimilated with coarse spatial resolution time series at a finer temporal resolution, referred to as a model (option -mod). The time series for both observation and model can either be provided as multi-band raster datasets or as multiple single band datasets. Missing data in the observations are predicted by the algorithm. The model must cover at least the spatial coverage of the observation. The missing data must be provided either as nodata values in the input (using option -obsnodata) or as an external mask (using option -obsmask). The time sequence for the model and observation should be provided via the options -tmod and -tobs. Tuning parameters for the algorithm are process noise (option -q) and the weights for uncertainty of valid observations (-uo) and the model (-um).

OPTIONS

-dir forward|backward|smooth, --direction forward|backward|smooth

direction to run model (forward|backward|smooth)

-mod filename, --model filename

coarse spatial resolution input datasets(s) used as model. Use either multi-band input (-model multiband_model.tif) or multiple single-band inputs (-mod model1 -mod model2 etc.)

-modmask filename, --modmask filename

model mask datasets(s). Must have same dimension as model input. Use either multi-band input or multiple single-band inputs

-obs filename, --observation filename

fine spatial resolution input dataset(s) used as observation. Use either multi-band input (-obs multiband_obs.tif) or multiple single-band inputs (-obs obs1 -obs obs2 etc.)

-obsmask filename, --obsmask filename

observation mask dataset(s). Must have same dimension as observation input (use multi-band input or multiple single-band inputs)

-tmod number, --tmodel number

time sequence of model input. Sequence must have exact same length as model input. Leave empty to have default sequence 0,1,2,etc.

-tobs number, --tobservation number

time sequence of observation input. Sequence must have exact same length as observation input

-a_srs EPSG:number, --a_srs EPSG:number

Override the projection for the output file (leave blank to copy from input file, use epsg:3035 to use European projection and force to European grid)

-ofw filename, --outputfw filename

Output raster dataset for forward model

-u_ofw filename, --u_outputfw filename

Uncertainty output raster dataset for forward model

-obw filename, --outputbw filename

Output raster dataset for backward model

-u_obw filename, --u_outputbw filename

Uncertainty output raster dataset for backward model

-ofb filename, --outputfb filename

Output raster dataset for smooth model

-u_ofb filename, --u_outputfb filename

Uncertainty output raster dataset for smooth model

-modnodata value, --modnodata value

invalid value for model input

-obsnodata value, --obsnodata value

invalid value for observation input

-msknodata value, --msknodata value

Mask value not to consider

-mskband value, --mskband value

Mask band to read (0 indexed)

-obsmin value, --obsmin value

Minimum value for observation data

-obsmax value, --obsmax value

Maximum value for observation data

-eps value, --eps value

epsilon for non zero division. Default: 0.00001

-um value, --uncertmodel value

Uncertainty of the model

-uo value, --uncertobs value

Uncertainty of valid observations

-unodata value, --uncertnodata value

Uncertainty in case of no-data values in observation.

-q value, --q value

Process noise: expresses instability (variance) of proportions of fine res pixels within a moderate resolution pixel

-down number, --down number

Downsampling factor for reading model data to calculate regression (default is ratio between coarse (model) and fine (obs) resolution raster datasets)

-ot type, --otype type

Data type for output image ({Byte / Int16 / UInt16 / UInt32 / Int32 / Float32 / Float64 / CInt16 / CInt32 / CFloat32 / CFloat64}). Empty string: inherit type from input image

-of GDALformat, --oformat GDALformat

Output image format (see also gdal_translate(1)). Empty string: inherit from input image

-co NAME=VALUE, --co NAME=VALUE

Creation option for output file. Multiple options can be specified.

-v level, --verbose level

verbose mode when positive