ncl_conraq (3) - Linux Manuals

ncl_conraq: draws a two dimensional contour map from irregularly

NAME

CONRAQ - draws a two dimensional contour map from irregularly distributed data. This is the small quick version of the Conran_family. It also has the fewest available number of options.

STATUS

CONRAQ is approaching obsolescence. If you have available an interpolation package which can do a random to gridded interpolation equal to that built into the Conran_family, then we recommend that you grid your dataset and use the Conpack utility instead. Refer to the conpack and conpack_family_params man pages as well as the NCAR Graphics Contouring and Mapping Tutorial.

SYNOPSIS

CONRAQ (XD,YD,ZD,NDP,WK,IWK)

DESCRIPTION

XD

Input, real array -- of dimension NDP containing the X coordinates of the data points.

YD

Input, real array -- of dimension NDP containing the Y coordinates of the data points.

ZD

Input, real array -- of dimension NDP containing the data values at the points.

NDP

Input, integer -- is the number of data points to be contoured. NDP must be 4 or larger.

WK

Input, real array -- workspace of dimension 15*NDP.

IWK

Input, integer array -- workspace which must be dimensioned at least IWK((27+NCP)*NDP).

The parameter NCP controls the number of data points to be used in the interpolation. Increasing NCP causes more of the surrounding data to influence the point of interpolation. In the case of linear interpolation NCP is always 4. In the case of C1 interpolation, NCP can vary from 2 to 25 with 4 as the default.

The interpolation option is selected using parameter ITP. See the conran_family_params man page for a description of all internal parameters.

USAGE

Contour lines are not smoothed or thinned, but a number of options are available through the use of internal parameters. See the conran_family_params man page.

Super and standard-and-smooth versions of the Conran_family are also available through entries CONRAS and CONRAN, respectively.

EXAMPLES

Use the ncargex command to see the relevant example tconaq.

ACCESS

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

The special conraq library is not loaded as part of the normal NCAR Graphics installation. It can be loaded by the user directly, along with the above three standard libraries, or loaded implicitly through the use of the -quick option of the ncargf77 command.

QUICK

Command: "ncargf77 -quick mycode.f"

MESSAGES

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

COPYRIGHT

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