Edward O eddy-geek

## slope.html
<!DOCTYPE html>
<html lang="en">
<head>
  <!-- https://gist.github.com/eddy-geek/ff8c4f3d74e1be6747baf3c91b41a50c -->
  <!-- .../gh api --method PATCH /gists/ff8c4f3d74e1be6747baf3c91b41a50c -F "files[slope.html][content]=@slope.html" -F "files[slope.md][content]=@slope.md" --jq '.html_url' -->
  <meta charset="utf-8" />
  <title>Hybrid DEM Slope/Aspect with Border Backfill — MapLibre GL JS</title>
  <meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1,user-scalable=no" />

  <link rel="stylesheet" href="https://unpkg.com/maplibre-gl@5.18.0/dist/maplibre-gl.css" />

## eslope-202603.json
      slope: [
        'step', ['slope'],
        "#ffffff", // white
        20, "#c0ffff", // light sky blue
        24, "#57ffff", // bright cyan
        28, "#00d3db", // aqua blue
        31, "#fffa32", // sunshine yellow
        34, "#ffc256", // macaroni
        37, "#fd7100", // orange
        40, "#ff0000", // cherry red

## README.md

      
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                eddy-geek
                / README.md
            
            
              Last active
              February 27, 2026 19:39
            
              
                maplibre-gl slope/aspect debug viewer
              
          
    What this does

full interactive slope/aspect debug viewer using only maplibre-gl-js with:


Hybrid DEM pipeline

Uses internal backfilled DEM tiles when available
Falls back to custom border-fixed tiles when needed
Status counters show internal vs fallback usage


Terrain analysis overlay


## terrarium2dem.md

      
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                eddy-geek
                / terrarium2dem.md
            
            
              Created
              January 14, 2026 21:46
            
          
    How to convert terrarrium terrain RGB mbtiles back into tif ?

You can do it with GDAL in two steps:

pick the correct decoder (Terrarium vs Mapbox Terrain‑RGB),
apply the formula to the RGB PNG tiles inside the MBTiles and write out a Float32 GeoTIFF (then optionally reproject to WGS84).

Below I give ready‑to‑run commands for both encodings, plus tips to choose the zoom level, mask with the alpha band, and reproject.

  
## create_windows_usb_pendrive_from_macos.sh
#!/bin/bash

set -e  # Exit on any error

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

## necessary-verbs.sh
#!/bin/sh
hda-verb /dev/snd/hwC0D0 0x20 0x500 0x0
hda-verb /dev/snd/hwC0D0 0x20 0x500 0x0
hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99
hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99
hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99
hda-verb /dev/snd/hwC0D0 0x20 0x480 0x0
hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99
hda-verb /dev/snd/hwC0D0 0x20 0x480 0x0
hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99

## README.md

      
              3 files
            
          
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                eddy-geek
                / README.md
            
            
              Last active
              May 6, 2024 14:07
            
          
    KDE Bug 466373 – Qt apps don't use wp-fractional-scale-v1 for hidpi fractional scaling on Wayland
SUMMARY
Qt client apps using system Qt 5.15.8 still use the old downscaling mechanism to deal with fractional scaling, instead of wp-fractional-scale-v1, leading to visual artefacts.
STEPS TO REPRODUCE

Set "Scale" to fractional eg 135% in Display Configuration
Open a Qt app

OBSERVED RESULT

  
## jpg_quality_pil_magick.py
def get_jpg_quality(pim: 'PIL.Image.Image') -> int:
    """
    Implement quality computation following ImageMagick heuristic algorithm:
    https://github.com/ImageMagick/ImageMagick/blob/7.1.0-57/coders/jpeg.c#L782
    Usage:
    ```
    pim = Img.open(...)
    quality = get_jpg_quality(pim)
    ```
    See also https://stackoverflow.com/questions/4354543/

## kde_neon_wayland_pipewire_screencasting_debugging.md

      
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                eddy-geek
                / kde_neon_wayland_pipewire_screencasting_debugging.md
            
            
              Last active
              September 21, 2021 14:19
            
          
Main bug: Can't share screen on a Wayland session with Firefox https://bugs.kde.org/show_bug.cgi?id=439607


from what I can see only Hirsuite (21.04) has xdg-desktop-portal built with PipeWire support

doesn't seem true anymore (see below)

Code: https://invent.kde.org/libraries/plasma-wayland-protocols/-/merge_requests/1/
Context: https://soyuka.me/make-screen-sharing-wayland-sway-work/
Other distros:

https://soyuka.me/make-screen-sharing-wayland-sway-work/


## pandas_dataframe_to_json_perf.md

      
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                eddy-geek
                / pandas_dataframe_to_json_perf.md
            
            
              Last active
              April 16, 2020 17:26
            
          
    Comparing length of json-encoded DataFrame. to_json doc
Conclusions with my sample dataset

CSV

can be signifantly more compact if your data has lots of nans / strings, since their encoding is empty / not-quoted
but index is lost
and careful with incompatible quoting if you embed csv in json


split is the most compact json encoding that keeps column and index names, use it over columns (default) / record

but index name is lost
and MultiIndex does not wround-trip
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<!-- https://gist.github.com/eddy-geek/ff8c4f3d74e1be6747baf3c91b41a50c -->
	<!-- .../gh api --method PATCH /gists/ff8c4f3d74e1be6747baf3c91b41a50c -F "files[slope.html][content]=@slope.html" -F "files[slope.md][content]=@slope.md" --jq '.html_url' -->
	<meta charset="utf-8" />
	<title>Hybrid DEM Slope/Aspect with Border Backfill — MapLibre GL JS</title>
	<meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1,user-scalable=no" />

	<link rel="stylesheet" href="https://unpkg.com/maplibre-gl@5.18.0/dist/maplibre-gl.css" />
	slope: [
	'step', ['slope'],
	"#ffffff", // white
	20, "#c0ffff", // light sky blue
	24, "#57ffff", // bright cyan
	28, "#00d3db", // aqua blue
	31, "#fffa32", // sunshine yellow
	34, "#ffc256", // macaroni
	37, "#fd7100", // orange
	40, "#ff0000", // cherry red
	#!/bin/bash

	set -e # Exit on any error

	# Colors for output
	RED='\033[0;31m'
	GREEN='\033[0;32m'
	YELLOW='\033[1;33m'
	BLUE='\033[0;34m'
	NC='\033[0m' # No Color
	#!/bin/sh
	hda-verb /dev/snd/hwC0D0 0x20 0x500 0x0
	hda-verb /dev/snd/hwC0D0 0x20 0x500 0x0
	hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99
	hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99
	hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99
	hda-verb /dev/snd/hwC0D0 0x20 0x480 0x0
	hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99
	hda-verb /dev/snd/hwC0D0 0x20 0x480 0x0
	hda-verb /dev/snd/hwC0D0 0x20 0x500 0x99
	def get_jpg_quality(pim: 'PIL.Image.Image') -> int:
	"""
	Implement quality computation following ImageMagick heuristic algorithm:
	https://github.com/ImageMagick/ImageMagick/blob/7.1.0-57/coders/jpeg.c#L782
	Usage:
	```
	pim = Img.open(...)
	quality = get_jpg_quality(pim)
	```
	See also https://stackoverflow.com/questions/4354543/