Overview

This import is available in DELFT-FEWS versions after 2010.02

GermanSnow imports grid time series data from the ASCII file produced by German SNOW model.

The SNOW files store three data types:

  • simulated data for (usually) 30 hours before the forecast time,
  • forecasted data for (usually) 72 hours after the forecast time,
  • status of the snow cover

All these three data types can be imported with GermanSnow.

Structure of the SNOW file

The first line contains the forecast time in the format "YYYY MM DD HH". The time zone is always UTC.
The forcast time may be preceded by the keyword : " - Datum: YYYY MM DD HH".

The second record contains the parameter Id and the time offset in hours in relation to the forecast time.
The next lines contain grid data. The start point of the grid in the SNOW file is South - West.

The following snippet illustrates a sample data file :

2011   1  10  18
 OBWN  -29
    2.0   2.0   2.0   1.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
    2.0   2.0   2.0   2.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
    2.0   2.0   2.0   1.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
    2.0   2.0   2.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
    2.0   1.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
 OBND  -29
    1.0   1.0   1.0   1.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
    1.0   1.0   2.0   2.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
    2.0   1.0   2.0   1.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
    1.0   2.0   2.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
    2.0   1.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
  OBWN  -28
    0.0   0.0   1.0   1.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
    0.0   1.0   1.0   2.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
    0.0   1.0   1.0   1.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
    0.0   1.0   1.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
    0.0   1.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
  OBND  -28
   ......
   ......

The record with forecast time may be exceptionally followed with a line acoording to this format:
" - Limits: [ X1- X2; Y2- Y2] - [ X1- X2; Y2- Y2]"
This information is associated with the corrections made by SNOW model. The reader ignores this line

Parser features

The parser must know the size of the grid to read from the SNOW files. So, the user must configure the grid geometry in grids.xml file.
The parser also expects that all parameters has the same grid size.

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