CMLS98B File Structures
Purpose | Processes
and Assumptions | Installation |
Use | Example |
References | Acknowledgements
Program Structure |
Platform Dependencies | File
Structures
FILE STRUCTURES
All files used by CMLS98B are ASCII files. They can be easily created by
other programs or by editors. Different values on a line are called fields.
Different lines are called records. One or more blank spaces separate fields
on the same line. The structures described are the forms assumed by CMLS98B.
Other forms will require rewriting the functions which read files. Specifics
for each file follow.
-
Weather: This file is illustrated below. Line 1 contains the number of days
in the file and the first year. Line 2 is a coded identifier for the weather
station. Line 3 is the name of the weather station. Line 4 contains the latitude
of the location in degrees, the character 'N' or 'S' for hemisphere,
the longitude in degrees, the character 'E' or 'W' for longitude,
the elevation, the characters 'M' or 'FT' for elevation units, and the characters
'MM' or 'IN' for precipitation units, and the character 'F' or 'C' for
temperature units of Fahrenheit or Celsius, respectively. Line 5 begins the
weather data with day of year followed by maximum temperature, minimum
temperature, and precipitation. Note that the day of year begins again at
1 each year.
10227 1948 OK3281 FORT COBB 35.10 N 98.43 W 1260 FT IN F 1 28 14 0.380 2 38 6 0.000 3 46 10 0.000 4 50 18 0.000 5 55 25 0.000 6 55 29 0.000 7 57 28 0.000 8 63 29 0.000 9 63 33 0.000 10 58 30 0.000 11 54 34 0.000 12 53 39 0.040 13 50 24 0.000 14 45 22 0.000 15 48 24 0.000 16 49 20 0.001 17 33 11 0.000 18 38 14 0.000 19 41 17 0.000 20 45 23 0.000 21 54 21 0.000 22 58 28 0.000 23 54 11 0.000 24 29 12 0.120 25 26 17 0.000 . . . . . . . . . . . . 365 47 12 0.000 366 48 15 0.000 1 50 24 0.000 2 59 25 0.000 . . . . . . . . . . . .
- Infiltration: Line 1 of this file contains the number of days of data in the file and the year the data begins. Line 2 contains a coded identifier for the location. Line 3 contains the name of the location. Line 4 contains the latitude of the location in degrees, the character 'N' or 'S' for hemisphere, the longitude, the character 'E' or 'W' for longitude, the elevation, the characters 'M' or 'FT' for elevation units, and the characters 'MM' or 'IN' for infiltration units. Lines 5 to the end of the file contain the day of year followed by the infiltration amount on that day. Thus the file looks like that for weather except that only one number instead of 3) is present for each day.
- Irrigation File: This file is identical to the infiltration file with irrigation amounts replacing infiltration amounts.
- Evapotranspiration: This file is identical in structure to the infiltration file. In this case the last set of units on line 4 represents the units for evapotranspiration. Beginning in line 5, each line contains the day of year and the evapotranspiration on that day.
- Pan Evaporation: This file is identical to the evapotranspiration file with daily evapotranspiration replaced by pan evapotranspiration.
-
Crop Coefficients: The crop coefficient file can contain time dependent crop
coefficients for many crops. Each line of the file represents a different
crop. The first field in the line is the name of the crop. This can be up
to 20 alphanumeric characters. The crop name cannot include a blank. The
crop name must be unique within this file. Following the crop name are up
to 12 day - crop coefficient data pairs. The days are referenced to the planting
day of the crop. That is, day 1 is the day the crop was planted. This table
is illustrated below for three crops. The values shown were estimated from
information presented in Jensen et al. (1990).
Corn 1 0.15 20 0.40 30 0.95 60 0.95 100 0.70 80 0.30 150 0.15 Soybeans 1 0.15 20 0.22 40 0.75 50 1.0 90 0.95 110 0.65 120 0.15 Peanuts 1 0.3 20 0.3 40 1.0 130 1.0 150 0.3 180 0.2 350 0.1
-
WGEN Parameters: The following table illustrates a parameter file. Line 1
contains the name of the weather station. Line 2 contains notes about the
station such as the name of the file from which these parameters were derived.
Line 3 contains the latitude of the location in degrees, the character 'N'
or 'S' for hemisphere, the longitude, the character 'E' or 'W' for longitude,
the elevation, the characters 'M' or 'FT' for elevation units, the characters
'MM' or 'IN' associated with the precipitation generated with these parameters,
and the characters 'F' (Fahrenheit) or 'C' (Celsius) for the temperature
units associated with generated high an low temperatures. Lines 4 through
15 contain PWW, PWD, ALPHA, and BETA for January through December. Line 16
contains TXMD, ATX, CVTX, ACVTX, TXMW, TN, ATN, CVTN, ACVTN, RMD, AR, and
RMW (Note: These 12 parameters can be spread over more than one line if you
prefer). See the WGEN manual for a description of these symbols.
FORT COBB OK3281 35.10 N 98.43 W 1260 FT IN F 0.409091 0.153179 0.324357 0.442812 0.467005 0.183986 0.340742 0.470576 0.409524 0.186930 0.365041 0.588176 0.423913 0.167683 0.444659 0.742441 0.477193 0.246998 0.402377 1.163035 0.440816 0.235294 0.391554 1.108837 0.411765 0.164464 0.373781 1.180033 0.335079 0.180207 0.379064 0.879246 0.378109 0.194053 0.394694 1.213369 0.437500 0.127119 0.356080 1.156289 0.379085 0.135371 0.337475 0.803611 0.438596 0.139168 0.318023 0.548300 76.036964 21.877216 0.125157 -0.076647 69.825600 48.341244 22.346968 0.196495 -0.144030 460.000000 198.000000 300.000000
