topic_surface(1)

✨ Topic: surface ✨

okay bestie, welcome to the surface corner of GRASS GIS 🌸 this is the group chat where all the modules that deal with surfaces hang out — filling holes, interpolating points, making fractals, measuring area, the whole vibe. Every single one is listed below, no gatekeeping. 💅

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🦋 The modules

• r.contour — makes a vector map of whatever contours you asked for, pulled straight out of a raster map. ✨
• r.fill.stats — fills those ’no data’ cells (NULLs) in a raster map fast with interpolated values (IDW). so it's basically plugging the gaps, speedrun edition.
• r.fillnulls — fills the no-data areas in raster maps using spline interpolation. yes it's giving "fill in the blanks" but make it ✨math✨.
• r.random.surface — generates random surface(s) with spatial dependence. chaotic but in a spatial way, iykyk.
• r.resamp.bspline — does bilinear or bicubic spline interpolation with Tykhonov regularization. fancy name, fancy math, slays.
• r.surf.area — prints an estimation of surface area for a raster map. just tells u how much area there is fr fr.
• r.surf.contour — generates a surface raster map from rasterized contours.
• r.surf.fractal — creates a fractal surface of a given fractal dimension. it's giving infinite detail 🌀
• r.surf.gauss — generates a raster map using a gaussian random number generator. normal distribution core.
• r.surf.idw — provides surface interpolation from raster point data by Inverse Distance Squared Weighting.
• r.surf.random — produces a raster surface map of uniform random deviates with a defined range.
• v.surf.bspline — performs bicubic or bilinear spline interpolation with Tykhonov regularization. (yes, it's the vector twin of r.resamp.bspline, and yes, both eat 💖)
• v.surf.idw — provides surface interpolation from vector point data by Inverse Distance Squared Weighting.
• v.surf.rst — performs surface interpolation from a vector points map by splines. the r.s.t. stands for "regularized spline with tension" energy, lowkey iconic.

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🔎 also

See also the corresponding keyword surface for additional references. 👀

And if u wanna go exploring:

• Main index
• Topics index
• Keywords index
• Graphical index
• Full index

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friendly heads up bestie: that keyword link is where the extra references live — go poke around if u want the deep lore. 🫶

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ok that's the whole page, no crumbs left. 🎀 big © 2003-2025 GRASS Development Team shoutout, this is from the GRASS GIS 8.4.2 Reference Manual, and yeah we're running GRASS 8.4.2 — periodt. 💜🦋✨