ncl_conop1 man page

CONOP1 — sets option switches for the Conran_family utility.





Character, input -- Selects an internal parameter and sets an option switch. The possibilities are:

'ITP=C1' or 'ITP=LIN'
'SCA=ON' or 'SCA=OFF' or 'SCA=PRI'

The following options are defined by this subroutine:

This option resets ALL parameters to their default values. DEF has no 'ON' or 'OFF' states.

To activate: CALL CONOP1('DEF')
Parameter to set extrapolation. Normally all CONRAN versions will only plot the boundaries of the convex hull defined by the user's data. To have the contours fill the rectangular area of the frame, set the EXT switch ON. The default is OFF.

To turn on: CALL CONOP1('EXT=ON')

To turn off: CALL CONOP1('EXT=OFF')
The parameter to display the grid. GRI is OFF by default.

To turn on: CALL CONOP1('GRI=ON')

To turn off: CALL CONOP1('GRI=OFF')

Note: If GRI=ON, the virtual grid will be superimposed over the contour plot. The X and Y tick intervals will be displayed under the map only if PER=ON. (see PER)
Set the interpolation scheme. There are two schemes -- C1 surfaces and linear. The C1 method takes longer but will give the best results when the data is sparse (less than 100 points). The linear method will produce a better plot when there is a dense data set. The default is C1 surface.

For C1 surface CALL CONOP1('ITP=C1')

For linear CALL CONOP1('ITP=LIN')
This parameter can be set to either label the contours (LAB=ON) or not (LAB=OFF). The default value is LAB=ON. (Does not apply to entry CONRAQ.)

To turn on: CALL CONOP1('LAB=ON')

To turn off: CALL CONOP1('LAB=OFF')
The parameter to list options on the printer. The default value is OFF: no options are displayed.

To turn on: CALL CONOP1('LOT=ON')

To turn off: CALL CONOP1('LOT=OFF')

Note: Print is directed to the standard output unit.
The parameter to plot a message. The default is ON.

To turn on: CALL CONOP1('MES=ON')

To turn off: CALL CONOP1('MES=OFF')

Note: If MES=ON, a message is printed below the plot giving contour intervals and execution time in seconds. If PER or GRI is ON, the message also contains the X and Y tick intervals.
The parameter to plot the input data values. The default value is PDV=OFF.

To turn on: CALL CONOP1('PDV=ON')

To turn off: CALL CONOP1('PDV=OFF')

Note: If PDV=ON, the input data values are plotted relative to their location on the contour map. If you only wish to see the locations and not the values, set PDV=ON and change FMT to produce an asterisk (*) such as (I1).
The parameter to draw a perimeter. The default value is PER=ON, which causes a perimeter to be drawn around the contour plot.

To turn on: CALL CONOP1('PER=ON')

To turn off: CALL CONOP1('PER=OFF')

Note: If MES is ON, the X and Y tick intervals will be given. These are the intervals in user coordinates that each tick mark represents.
The parameter to plot relative minima and maxima. (Does not apply to entry CONRAQ.) This parameter is OFF by default.

To turn off: CALL CONOP1('PMM=OFF')

To turn on: CALL CONOP1('PMM=ON')
The parameter which sets the plot shield option. The outline of the shield will be drawn on the same frame as the contour plot. (Does not apply to entry CONRAQ.) By default this option is OFF.

Draw the shield: CALL CONOP1('PSL=ON')

Don't draw it: CALL CONOP1('PSL=OFF')

Note: See parameter SLD using "man conop3" to see how the polygon is entered which defines the shield.
The parameter indicating the use of the same data in a new execution. The default value is OFF.

To turn on: CALL CONOP1('REP=ON')

To turn off: CALL CONOP1('REP=OFF')

Note: If REP=ON, the same X-Y data and triangulation are to be used, but it is assumed that the user has changed the contour values or resolution for this run. Scratch arrays WK and IWK must remain unchanged.
The parameter for scaling of the plot on a frame. This parameter is ON by default.

User scaling: CALL CONOP1('SCA=OFF')

Program scaling: CALL CONOP1('SCA=ON')

Prior window: CALL CONOP1('SCA=PRI')

If SCA=OFF, plotting instructions are issued using the user's input coordinates. SCA=OFF should be used to interface with EZMAP. If SCA=ON, a viewport is established such that the plot will fit into the center 90 percent of the frame. If SCA=PRI, the program maps the user's plot instructions into the portion of the frame defined by the current normalization transformation.
The parameter to advance the frame before triangulation. The default value is TFR=ON, which means that the contours and the triangles will be plotted on separate frames.

If program set: CALL CONOP1('TFR=ON')

To turn off: CALL CONOP1('TFR=OFF')

Note: Triangles are plotted after the contouring is completed. To see the triangles over the contours, set TFR=OFF.
The parameter to plot only the triangles.

To turn off: CALL CONOP1('TOP=OFF')

To turn on: CALL CONOP1('TOP=ON')

Setting TOP=ON causes parameters TRI and TFR to be set to TRI=ON, and TFR=OFF. Setting TOP=OFF results in TRI=OFF and TFR=ON. If another setting is wanted for either TRI or TFR, it should be reset after the TOP call.

Note: The user may wish to overlay the triangles on some other plot. 'TOP=ON' will allow that.
The parameter to plot the triangulation. The default is OFF and therefore the triangles are not drawn.

To turn on: CALL CONOP1('TRI=ON')

To turn off: CALL CONOP1('TRI=OFF')

Note: Plotting the triangles will indicate to the user where good and bad points of interpolation are occurring in the contour map. Equilateral triangles are optimal for interpolation. Quality degrades as triangles approach a long and narrow shape. The convex hull of the triangulation is also a poor point of interpolation.


CONOP1 is called to toggle Conran_family options before entries CONRAN, CONRAQ, or CONRAS are called to generate the contour plot.


Use the command ncargex to see the following examples: tconaq, tconan, and tconas.


To use CONOP1 load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably in that order.


See the conran_family man page for a description of all Conran_family error messages and/or informational messages.

See Also

Online: conran_family, conran_family_params, conran, conraq, conras, conop2, conop3, conop4, conpack, conpack_params

Hardcopy: NCAR Graphics Contouring and Mapping Tutorial; NCAR Graphics Fundamentals, UNIX Version; User's Guide for NCAR GKS-0A Graphics