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 <[email protected]>: > 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 > > _______________________________________________ > grass-user mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/grass-user >
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