CSSGRIDD(3NCARG)

✨ CSSGRIDD ✨

okay bestie, sit down, we're doing CSSGRIDD from the NCAR GRAPHICS manual, section 3NCARG 💖 it's a Fortran callable, it does tension spline interpolation on a sphere, and honestly? it's giving main character energy. 🦋

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💅 NAME 💅

CSSGRIDD — tension spline interpolation on a sphere. yes that's it, that's the whole vibe. no cap.

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🎀 SYNOPSIS 🎀

CALL CSSGRIDD (N, RLAT, RLON, F, NI, NJ, PLAT, PLON, FF, IWK, RWK, IER)

periodt. that's the call. 🫶

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🌸 DESCRIPTION 🌸

okay so here's the tea on every single argument, and I mean every single one, we are not skipping anybody 🧚

• N (integer, input) — how many input data points you got. and she has to be N > 2, okay? strictly greater. don't test her. 😭
• RLAT (double precision, input) — an array holding the latitudes of your input data, in degrees. ⚠️ major caveat: the first three points must not be collinear — like, they cannot all lie on a common great circle. if they do? we don't talk about it. 🙈
• RLON (double precision, input) — an array holding the longitudes of your input data, also in degrees. longitude bestie, we love her. 🌈
• F (double precision, input) — an array of data values. F(I) is the functional value at (RLAT(I),RLON(I)) for I = 1 to N. so like, the actual numbers you're interpolating. ✨
• NI (integer, input) — the number of rows in the uniform output grid. and get this — NI can be 1. one row. single. iconic. 👑
• NJ (integer, input) — the number of columns in the uniform output grid. and yes, NJ can be 1 too. one column, one row, we contain multitudes. 💜
• PLAT (double precision, input) — an array of length NI containing the latitudes of the output grid lines. the values in PLAT should be in degrees. 🎀
• PLON (double precision, input) — an array of length NJ containing the longitudes of the output grid lines. the values in PLON should be in degrees. 🎀
• FF (double precision, output) — the payoff bestie!! 🎉 an NI by NJ array containing the desired interpolated values. FF(I,J) is the interpolated value at the coordinate specified by PLAT(I) and PLON(J) for I = 1 to NI and J = 1 to NJ. she's the moment. 💖
• IWK (integer, input) — an integer workspace of length 27*N. yes, twenty-seven times N. write it down. ✍️
• RWK (double precision, input) — a work array dimensioned for 13*N. 🚨 note that RWK must be typed DOUBLE PRECISION — do not come in here with single precision, I'm begging you. 😭
• IER (integer, output) — the error return value. if IER comes back as 0, no errors were detected, we slayed, we ate, nothing to see here. 💅 if IER is non-zero, then go read the man page for cssgrid_errors for the details — that's where the lore lives. 📖

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🔥 USAGE 🔥

CSSGRIDD is called to find an interpolating tension spline for data randomly positioned on a sphere. 🌍 and — plot twist — CSSGRIDD is a double precision version of CSSGRID. so if you wanted the single-precision sibling, you know where to go. 👀

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🌈 ACCESS 🌈

to use CSSGRIDD, load the NCAR Graphics library ngmath. that's the whole ritual. 🕯️✨

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💖 SEE ALSO 💖

• css_overview
• csstri
• cssgrid
• cssgrid_errors

and if you want the full deep dive, complete documentation for Cssgrid is available at this URL, literally copy-paste it, don't retype it bestie:

http://ngwww.ucar.edu/ngdoc/ng/ngmath/cssgrid/csshome.html

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👑 COPYRIGHT 👑

Copyright (C) 2000 University Corporation for Atmospheric Research

The use of this Software is governed by a License Agreement.

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and that's the whole page, bestie!! 🦋💖✨ this was CSSGRIDD(3NCARG) from the UNIX manual, dated MAY 2000 — yeah she's a vintage queen and she still serves. 🎀 go interpolate something cute. no cap. 💅🫶