pkfilterdem(1)

💖 pkfilterdem — bestie edition 💖

okay so this is the manual for pkfilterdem(1) from the pkfilterdem crew, and honestly? she's a whole vibe. we're filtering digital elevation model rasters up in here and i'm gonna walk you through it like we're texting at 2am. no gatekeeping. 🫶

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✨ NAME ✨

pkfilterdem — filter digital elevation model raster datasets 🏔️✨

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🌈 SYNOPSIS 🌈

pkfilterdem -i input -o output [options] [advanced options]

that's it. that's the whole entrance. -i in, -o out, and the rest is toppings. 🍓

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💅 DESCRIPTION 💅

pkfilterdem can be used to filter digital elevation models. periodt.

she's typically used after the utility pklas2img(1) to create a digital terrain model. so like, pklas2img does her thing, and then pkfilterdem comes in and cleans it up. the way that pipeline just works. 😭💖

the default filter operation is the progressive morphological filter. the original page links to it right here:

http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1202973&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D1202973

yes bestie it's a long link. it's giving "academic paper" energy. iykyk. 👑

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🎀 OPTIONS 🎀

the standard menu, gorgeous and reliable:

• -i filename, --input filename — input image 📥
• -o filename, --output filename — output classification image 📤
• -f filter, --filter filter — post processing filter. your choices are: vito, etew_min, promorph (the progressive morphological filter), open, close). yes, that trailing ) is in the original, we do not edit the queen's punctuation. 💀
• -dim maxsize, --dim maxsize — maximum filter kernel size 📐
• -ot type, --otype type — data type for the output image. pick one: (Byte / Int16 / UInt16 / UInt32 / Int32 / Float32 / Float64 / CInt16 / CInt32 / CFloat32 / CFloat64). an empty string means: inherit the type from the input image 🧬
• -of format, --oformat format — output image format (see also gdal_translate(1)). 📦
• -ct colortable, --ct colortable — color table (a file with 5 columns: id R G B ALFA (0: transparent, 255: solid)). use none to omit the color table 🎨
• -nodata value, --nodata value — nodata value 🚫
• -v level, --verbose level — verbose mode if > 0 🗣️

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🔥 Advanced options 🔥

this is the vip section. main character energy only. 👑

• -circ, --circular — circular disc kernel for dilation and erosion ⭕
• -st threshold, --st threshold — slope threshold used for morphological filtering. use a low value to remove more height objects in flat terrains 📉
• -ht threshold, --ht threshold — initial height threshold for progressive morphological filtering. use low values to remove more height objects. optionally, a maximum height threshold can be set via a second argument (e.g., -ht 0.2 -ht 2.5 sets an initial threshold at 0.2 m and caps the threshold at 2.5 m). 🪜
• -minchange number, --minchange number — stop iterations when no more pixels are changed than this threshold. like, if barely anything's moving, she's done, she's leaving the group chat. 🛑🦋

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👀 SEE ALSO 👀

• pklas2img(1)

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bestie reminder: every flag, value, default, and weird little ) up there is exactly as the original says it. i did not fix anything. i am a good archivist and also a good friend. 💜

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that's the whole page, no cap. this one's from the pkfilterdem(1) fam, dated 01 January 2025 — so yes, she's a New Year's baby, iconic behavior. go filter something gorgeous. slay. 💅🌸✨