[GRASS-user] t.register: register 4 consecutive rasters maps per month for long time series

[Veronica Andreo]

Hello Johanes,

there's and example in t.register manual page with netCDF files [0] that
might help. You would have 48 maps per year (IMHO, 0.25*month is a bit
strange as time step, but well). I would say that you need to write a
script to get dates for each 1/4 of a month (maybe someone else know of a
function to do a similar task, dunno) in your time series and then make a
file with mapname|start_time|end_time to pass to t.register.

However, if you only need to estimate yearly means and long term means, you
can use r.series [1] with every 48 maps for yearly means and, the whole
list of maps for the long term mean.

hth,
Vero

[0] https://grass.osgeo.org/grass72/manuals/t.register.html
[1] https://grass.osgeo.org/grass72/manuals/r.series.html

2017-10-24 11:56 GMT+02:00 Johannes Radinger <johannesradinger at gmail.com>:

> Hi,
> I am very new to the temporal functionalities of GRASS. Specifically I
> have a netCDF file that contains many layers where each layer represents a
> raster map of a drought index (http://monitordesequia.csic.es/map/) for a
> timepoint of a timeseries. The time series is from 1/1961 to 12/2015 with 4
> maps for each month. So these are not really weekly maps but maps with an
> interval of 0.25*months. The layers of the netCDF are only numbered
> consecutively so there is no indication of a specific date etc. (I just now
> that they start with 1/1961 and then the interval of 0.25*months). What
> would be the procedure to register these raster maps in GRASS so that I can
> calculate later only e.g. yearly means and a long-time year average?
>
> Best regards,
> Johannes
>
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