ncl_ngwsym (3) - Linux Manuals

ncl_ngwsym: Draws a symbol from the standard WMO/NOAA meteorological

NAME

NGWSYM - Draws a symbol from the standard WMO/NOAA meteorological fonts by reference to the font name and symbol number within that font.

SYNOPSIS

CALL NGWSYM(FTYPE,NUM,X,Y,SIZE,ICOLOR,IALT)

C-BINDING SYNOPSIS

#include <ncarg/ncargC.h>

void c_ngwsym(char *ftype, int num, float x, float y,
float size, int icolor, int ialt)

DESCRIPTION

FTYPE

(an input parameter of type CHARACTER) specifying the desired font. Legal values are:

'WW'

- Present weather.

'C'

- Cloud types.

'CL'

- Low clouds.

'CM'

- Medium clouds.

'CH'

- High clouds.

'W'

- Past weather.

'N'

- Sky cover.

'a'

- Pressure tendency.

NUM

(an input parameter of type INTEGER) specifying the number of the desired symbol within the specified font.

X

(an input parameter of type REAL) specifying the X coordinate position, in world coordinates, where the symbol is to be positioned. This X position marks the horizontal center of the symbol.

Y

(an input parameter of type REAL) specifying the Y coordinate position, in world coordinates, where the symbol is to be positioned. This Y position marks the vertical center of the symbol.

SIZE

(an input parameter of type REAL) the value of which is the height, in world coordinates, of the symbol.

ICOLOR

(an input parameter of type INTEGER) the value of which is the GKS color index specifying what color the symbol will be.

IALT

(an input parameter of type INTEGER) indicating whether an alternate representation for the specified symbol is to be used. If IALT=1, then the alternate symbol for the one specified is drawn. This applies only to a few symbols such as numbers 7, 93, 94, 95, 97 in the WW font and number 3 in the W font.

C-BINDING DESCRIPTION

The C binding argument descriptions are the same as the FORTRAN argument descriptions.

USAGE

This function simply looks up the appropriate symbol in either font 36 or 37 of Plotchar and uses Plotchar to draw the symbol.

To produce a table of all the weather symbols broken down by font and symbol number, execute "ncargex fngwsym".

For the WW (present weather) font, the descriptions for the symbols are:

0

Cloud development NOT observed or NOT observable during past hour

1

Clouds generally dissolving or becoming less developed during past hour

2

State of sky on the whole unchanged during past hour

3

Clouds generally forming or developing during past hour

4

Visibility reduced by smoke

5

Haze

6

Widespread dust in suspension in the air, NOT raised by wind, at time of observation

7

Dust or sand raised by wind at time of observation

8

Well-developed dust whirl(s) within past hour

9

Dust storm or sandstorm within sight of or at station during past hour

10

Light fog (mist)

11

Patches of shallow fog at station, NOT deeper than 6 feet on land

12

More or less continuous shallow fog at station, NOT deeper than 6 feet on land

13

Lightning visible, no thunder heard

14

Precipitation within sight, but NOT reaching the ground

15

Precipitation within sight, reaching the ground but distant from station

16

Precipitation within sight, reaching the ground, near to but NOT at station

17

Thunderstorm, but no precipitation at the station

18

Squall(s) within sight during past hour or at time of observation

19

Funnel cloud(s) within sight of station at time of observation

20

Drizzle (NOT freezing) or snow grains (NOT falling as showers) during past hour, but NOT at time of observation

21

Rain (NOT freezing and not falling as showers) during past hour, but NOT at time of observation

22

Snow (NOT falling as showers) during past hour, but NOT at time of observation

23

Rain and snow or ice pellets (NOT falling as showers) during past hour, but NOT at time of observation

24

Freezing drizzle or freezing rain (NOT falling as showers) during past hour, but NOT at time of observation

25

Showers of rain during past hour, but NOT at time of observation

26

Showers of snow or of rain and snow, during past hour, but NOT at time of observation

27

Showers of hail or of hail and rain, during past hour, but NOT at time of observation

28

Fog during past hour, but NOT at time of observation

29

Thunderstorm (with or without precipitation) during past hour, but NOT at time of observation

30

Slight or moderate dust storm or sandstorm, has decreased during past hour

31

Slight or moderate dust storm or sandstorm, no appreciable change during past hour

32

Slight or moderate dust storm or sandstorm has begun or increased during past hour

33

Severe dust storm or sandstorm, has decreased during past hour

34

Severe dust storm or sandstorm, no appreciable change during past hour

35

Severe dust storm or sandstorm has begun or increased during past hour

36

Slight or moderate drifting snow, generally low (less than 6 feet)

37

Heavy drifting snow, generally low

38

Slight or moderate blowing snow, generally high (more than 6 feet)

39

Heavy blowing snow, generally high

40

For or ice fog at distance at time of observation, but NOT at station during past hour

41

Fog or ice fog in patches

42

Fog or ice fog, sky discernible, has become thinner during past hour

43

Fog or ice fog, sky NOT discernible, has become thinner during past hour

44

Fog or ice fog, sky discernible, no appreciable change during past hour

45

Fog or ice fog, sky NOT discernible, no appreciable change during past hour

46

Fog or ice fog, sky discernible, has begun or become thicker during past hour

47

Fog or ice fog, sky NOT discernible, has begun or become thicker during past hour

48

Fog depositing rime, sky discernible

49

Fog depositing rime, sky NOT discernible

50

Intermittent drizzle (NOT freezing), slight at time of observation

51

Continuous drizzle (NOT freezing), slight at time of observation

52

Intermittent drizzle (NOT freezing), moderate at time of observation

53

Continuous drizzle (NOT freezing), moderate at time of observation

54

Intermittent drizzle (NOT freezing), heavy at time of observation

55

Continuous drizzle (NOT freezing), heavy at time of observation

56

Slight freezing drizzle

57

Moderate or heavy freezing drizzle

58

Drizzle and rain, slight

59

Drizzle and rain, moderate or heavy

60

Intermittent rain (NOT freezing), slight at time of observation

61

Continuous rain (NOT freezing), slight at time of observation

62

Intermittent rain (NOT freezing), moderate at time of observation

63

Continuous rain (NOT freezing), moderate at time of observation

64

Intermittent rain (NOT freezing), heavy at time of observation

65

Continuous rain (NOT freezing), heavy at time of observation

66

Slight freezing rain

67

Moderate or heavy freezing rain

68

Rain or drizzle and snow, slight

69

Rain or drizzle and snow, moderate or heavy

70

Intermittent fall of snowflakes, slight at time of observation

71

Continuous fall of snowflakes, slight at time of observation

72

Intermittent fall of snowflakes, moderate at time of observation

73

Continuous fall of snowflakes, moderate at time of observation

74

Intermittent fall of snowflakes, heavy at time of observation

75

Continuous fall of snowflakes, heavy at time of observation

76

Ice prisms (with or without fog)

77

Snow grains (with or without fog)

78

Isolated starlike snow crystals (with or without fog)

79

Ice pellets or snow pellets

80

Slight rain shower(s)

81

Moderate or heavy rain shower(s)

82

Violent rain shower(s)

83

Slight shower(s) of rain and snow mixed

84

Moderate or heavy shower(s) of rain and snow mixed

85

Slight snow shower(s)

86

Moderate or heavy snow shower(s)

87

Slight shower(s) of snow pellets, or ice pellets with or without rain, or rain and snow mixed

88

Moderate or heavy shower(s) of snow pellets, or ice pellets, or ice pellets with or without rain or rain and snow mixed

89

Slight shower(s) of hail, with or without rain or rain and snow mixed, not associated with thunder

90

Moderate or heavy shower(s) of hail, with or without rain, or rain and snow mixed, not associated with thunder

91

Slight rain at time of observation; thunderstorm during past hour, but NOT at time of observation

92

Moderate or heavy rain at time of observation; thunderstorm during past hour, but NOT at time of observation

93

Slight snow, or rain and snow mixed, or hail at time of observation; thunderstorm during past hour, but NOT at time of observation

94

Moderate or heavy snow, or rain and snow mixed, or hail at time of observation; thunderstorm during past hour, but NOT at time of observation

95

Slight or moderate thunderstorm without hail, but with rain and/or snow at time of observation

96

Slight or moderate thunderstorm, with hail at time of observation

97

Heavy thunderstorm, without hail, but with rain and/or snow at time of observation

98

Thunderstorm combined with dust storm or sandstorm at time of observation

99

Heavy thunderstorm with hail at time of observation

For the C (cloud types) font:

0

Ci - Cirrus

1

Cc - Cirrocumulus

2

Cs - Cirrostratus

3

Ac - Altocumulus

4

As - Altostratus

5

Ns - Nimbostratus

6

Sc - Stratocumulus

7

St - Stratus

8

Cu - Cumulus

9

Cb - Cumulonimbus

For the CL (low clouds) font:

0

not defined

1

Cu of fair weather, little vertical development and seemingly flattened

2

Cu of considerable development, generally towering, with or without other Cu or Sc bases all at same level

3

Cb with tops lacking clear-cut outlines, but distinctly not cirriform or anvil-shaped; with or without Cu, Sc, St

4

Sc formed by spreading out of Cu; Cu often present also

5

Sc not formed by spreading out of Cu

6

St or StFra (stratus fractus), but no StFra of bad weather

7

StFra and/or CuFra of bad weather (scud)

8

Cu and Sc (not formed by spreading out of Cu) with bases at different levels

9

Cb having clearly fibrous (cirriform) top, often anvil-shaped, with or without Cu, Sc, St, or scud

For the CM (medium clouds) font:

0

not defined

1

Thin As (most of cloud layer semitransparent)

2

Thick As, greater part sufficiently dense to hide sun (or moon), or Ns

3

Thin Ac, mostly semitransparent: cloud elements not changing much and at a single level

4

Thin Ac in patches; cloud elements continually changing and/or occurring at more than one level

5

Thin Ac in bands or in a layer gradually spreading over sky and usually thickening as a whole

6

Ac formed by the spreading out of Cu or Cb

7

Double-layered Ac, or a thick layer of Ac, not increasing; or Ac with As and/or Ns

8

Ac in the form of Cu-shaped tufts or Ac with turrets

9

Ac of a chaotic sky, usually at different levels; patches of dense Ci are usually present also

For the CH (high clouds) font:

0

not defined

1

Filaments of Ci, or "mares tails," scattered and not increasing

2

Dense Ci in patches or twisted sheaves, usually not increasing, sometimes like remains of Cb; or towers or tufts

3

Dense Ci, often anvil-shaped, derived from or associated with Cb

4

Ci, often hook-shaped, gradually spreading over the sky and usually thickening as a whole

5

Ci and Cs, often in converging bands, or Cs alone; generally overspreading and growing denser; the continuous layer not reaching 45 degree altitude

6

Ci and Cs, often in converging bands, or Cs alone; generally overspreading and growing denser; the continuous layer exceeding 45 degree altitude

7

Veil of Cs covering the entire sky

8

Cs not increasing and not covering entire sky

9

Cc alone or Cc with some Ci or Cs, but the Cc being the main cirriform cloud

For the W (past weather) font:

0

Clear or few clouds [no associated symbol]

1

Partly cloudy (scattered) or variable sky [no associated symbol]

2

Cloudy (broken) or overcast [no associated symbol]

3

Sandstorm or dust storm, or drifting or blowing snow

4

Fog, ice fog, thick haze or thick smoke

5

Drizzle

6

Rain

7

Snow, or rain and snow mixed, or ice pellets

8

Shower(s)

9

Thunderstorm, with or without precipitation

For the N (sky cover) font:

0

No clouds

1

One-tenth or less

2

Two-tenths or three-tenths

3

Four-tenths

4

Five-tenths

5

Six-tenths

6

Seven-tenths or eight tenths

7

Nine-tenths or overcast with openings

8

Completely overcast (ten-tenths)

9

Sky obscured

For the a (pressure tendency) font:

0

Rising, then falling; same as or higher than 3 hours ago

1

Rising, then steady; or rising, then rising more slowly

2

Rising steadily, or unsteadily

3

Falling or steady, then rising; or rising, then rising more rapidly

4

Steady; same as 3 hours ago

5

Falling, then rising; same as or lower than 3 hours ago

6

Falling, then steady; or falling, then falling more slowly

7

Falling steadily, or unsteadily

8

Steady or rising, then falling; or falling, then falling more rapidly

9

not defined

EXAMPLES

CALL NGWSYM('N',5,.5,.5,.25,1,0)

Plots the symbol for six-tenths cloud cover at position (.5,.5) and height .25 in the foreground color.

CALL NGWSYM('a',6,.2,.8,.3,1,0)

Plots the symbol for barometric pressure that is falling then steady.

CALL NGWSYM('WW',95,.5,.5,.2,1,1)

Plots the alternate symbol for slight or moderate thunderstorm without hail.

Use the ncargex command to see the following relevant example: fngwsym.

ACCESS

To use NGWSYM or c_ngwsym, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably in that order.

MESSAGES

If an illegal font, or symbol number within a font, is requested, then a warning is issued.

COPYRIGHT

Copyright (C) 1987-2009
University Corporation for Atmospheric Research
The use of this Software is governed by a License Agreement.