1. File Header

The file header contains the basic information about the model dimensions and other metadata required to construct the computer model.

01: 2Z-V5

02: % Model description
03: ENVI-met test area

04: % Number of grids in x, y and z direction
05: 20
06: 26
07: 25

08: % Base Horizontal Gridsize dx, dy
09: 2.00
10: 2.00
11: % Vertical Gridsize
12: 2.00

13: % Telecoping vertical Grid? 0= No 1= Yes
14: 0 or 1
14a: % Telecoping factor in %
14b: 20
14c: % Start z-level for telecoping
14d: 30.00

15: % Model rotation out of grid north in deg
16: 0.0

17: % Number of nesting grids
18: 3
19: % Soil Profile ID for Nesting Grid A
20: cl
21: % Soil Profile ID for Nesting Grid
22: as

23: % Geographical Projection System
24: GK
25: % Real world coordinate lower left grid x and y
26: 2000.00
27: 2000.00

28: % Name of location (city,..)
29: Essen/Germany
30: % Position on Earth (Longitude and Latitude)
31: 53.00
32: 7.00
33: % Name of Reference Time Zone
34: CET/UTC+1
35: % Definition Longitude of Time Zone
36: 15.00

37: % Define where Area Data are located
38: [INTERNAL]
(…)

Most of the lines are self-explaining, however, a brief description what they mean follows next.
In general, lines beginning with “%” are remark lines. Even if they do not contain information, they must be kept and they cannot be extended by more remark lines in order to fullfill the format of the file.

01 Format ID

Defines the number of characters defining one number in the matrix blocks. See annotations here.
-V5 indicates an area input file in format version 5 used by ENVI-met V3.1 and newer.
Other formats are no longer supported by ENVI-met, but can be loaded and then saved in the Editor!

02-03: Model Description

Free text line describeing the model area

04-07: Number of Grids in x-, y- and z-Direction

The values for x- and y- must correspond to the matrix data following later in the file.
The number of z-values must be defined by the user.
When using the equidistant grid method, the lowest grid box above the surface is automatically split into 5 sub-boxes with Δzs=0.2 Δz. These additional 4 boxes are not included in the number of z-grids given here.
The final model size is increased by the Nesting Grids and the additional 4 surface-boxes mentioned above. Make sure, that your area is not too big to run ENVI-met.

08-12: Base Grid Size in x-, y- and z-Direction

Defines the size of one grid point in meters in the x- y- and z-direction.
Equidistant spacing is used in this version except of the nesting grids and the z-grids if a telecoping grid is used.
For more details see Vertical Grid Layout.

13-14: Usage of Telecoping Vertical Grid yes/no

If a telecoping grid is used (“1” in line 14) the lines 14 a- d follow.
If no telecoping gird is used, the next line will be line 15 .

15-16: Model Rotation Settings

Model rotation out of grid north in degrees. For more information see here.

17-22: Nesting Grid Settings

L 18 defines the number of nesting grids. For more information see here.
Ls 20, 22 define the ID of the soil profiles to be assigned alternating to the nesting grids (e.g. “cl”).

23-27: Georeference Settings

Defines the geographical projection system (not used yet) and the real world reference of the lower left grid.
Will be used for model management later on, for the moment only for information.

28-36: Geographical Position of the Domain

Defines the location in terms of name, longitude, latitude and time zone reference.
See ENVI-met editor for details.

In version 3.1, only the [INTERNAL] format is supported which means that the geometry data are included inside this Area Input File.

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