Skip to content

Instantly share code, notes, and snippets.

View flemmens's full-sized avatar

François Lemmens flemmens

4 followers · 11 following
View GitHub Profile
@iandees
iandees / pgdc_arcticdem_mosaic_index.txt
Last active October 6, 2017 17:30
http://data.pgc.umn.edu/elev/dem/setsm/ArcticDEM/mosaic/v2.0/07_40/07_40_2_2_5m_v2.0.tar.gz
http://data.pgc.umn.edu/elev/dem/setsm/ArcticDEM/mosaic/v2.0/07_41/07_41_1_1_5m_v2.0.tar.gz
http://data.pgc.umn.edu/elev/dem/setsm/ArcticDEM/mosaic/v2.0/07_41/07_41_1_2_5m_v2.0.tar.gz
http://data.pgc.umn.edu/elev/dem/setsm/ArcticDEM/mosaic/v2.0/07_41/07_41_2_1_5m_v2.0.tar.gz
http://data.pgc.umn.edu/elev/dem/setsm/ArcticDEM/mosaic/v2.0/07_41/07_41_2_2_5m_v2.0.tar.gz
http://data.pgc.umn.edu/elev/dem/setsm/ArcticDEM/mosaic/v2.0/07_42/07_42_1_2_5m_v2.0.tar.gz
http://data.pgc.umn.edu/elev/dem/setsm/ArcticDEM/mosaic/v2.0/08_39/08_39_1_2_5m_v2.0.tar
http://data.pgc.umn.edu/elev/dem/setsm/ArcticDEM/mosaic/v2.0/08_39/08_39_2_2_5m_v2.0.tar
http://data.pgc.umn.edu/elev/dem/setsm/ArcticDEM/mosaic/v2.0/08_40/08_40_1_1_5m_v2.0.tar.gz
http://data.pgc.umn.edu/elev/dem/setsm/ArcticDEM/mosaic/v2.0/08_40/08_40_1_2_5m_v2.0.tar.gz
@kchapelier
kchapelier / gaussianKernel1d.js
Created June 18, 2017 09:07
1D gaussian kernel
// based on https://warpycode.wordpress.com/2009/04/13/computing-a-1d-gaussian-kernel/
// see http://www.stat.wisc.edu/~mchung/teaching/MIA/reading/diffusion.gaussian.kernel.pdf.pdf for more info
var gaussianKernel1d = (function () {
var sqr2pi = Math.sqrt(2 * Math.PI);
return function gaussianKernel1d (size, sigma) {
"use strict";
// ensure size is even and prepare variables
@bendc
bendc / supportsES6.js
Created August 25, 2016 08:05
Test if ES6 is ~fully supported
var supportsES6 = function() {
try {
new Function("(a = 0) => a");
return true;
}
catch (err) {
return false;
}
}();
@jasonkit
jasonkit / lena.js
Last active August 14, 2023 13:17
Using WebGL to do Gaussian Blur
var canvas_in = document.getElementById("canvas_in");
var canvas_out = document.getElementById("canvas_out");
var img = new Image();
img.onload = function() {
var w = this.width;
var h = this.height;
canvas_in.width = canvas_out.width = w;
canvas_in.height = canvas_out.height = h;
@paulkaplan
paulkaplan / ascii_stl_writer.js
Last active November 17, 2021 17:32
ascii_stl_writer.js
// Written by Paul Kaplan
var AsciiStlWriter = (function() {
// ASCI STL files
function stringifyVector(vec){
return ""+vec.x+" "+vec.y+" "+vec.z;
}
function stringifyVertex(vec){
@paulkaplan
paulkaplan / binary_stl_writer.js
Last active November 17, 2021 17:32
Writing binary and ascii STL files in Javascript
// Written by Paul Kaplan
var BinaryStlWriter = (function() {
var that = {};
var writeVector = function(dataview, offset, vector, isLittleEndian) {
offset = writeFloat(dataview, offset, vector.x, isLittleEndian);
offset = writeFloat(dataview, offset, vector.y, isLittleEndian);
return writeFloat(dataview, offset, vector.z, isLittleEndian);
};
@denitram
denitram / BU-restore functions in postgresql
Last active July 10, 2023 11:09
Postgresql: backup and restore functions
# First, make a dump of the database without data (-s)
$ pg_dump -h localhost -U username -Fc -s -f db_dump dbName
# Create a list of the functions
$ pg_restore -l db_dump | grep FUNCTION > function_list
# Restore the functions in an other database
$ pg_restore -h localhost -U username -d other-dbName -L function_list db_dump
@bertspaan
bertspaan / README.md
Created January 2, 2014 15:28
Python script to convert DBF database file to CSV
@cquest
cquest / hillshade-transparent-overlay.md
Last active July 5, 2022 06:30
transparent hillshade cooking guide using gdal

Ingredients

  • a decent DEM
  • gdal
  • some computer

compute grayscale hillshade using gdaldem

gdaldem hillshade -compute_edges your_dem_file hillshade.tif

color-ramp to compute transparency (alpha channel)

In another bowl, prepare the following shade.ramp file:

@darrell
darrell / voronoi.sql
Last active November 22, 2020 03:03
Code to generate Voronoi diagrams in PostGIS using Python. Many thanks to everyone who contributed to this code. Original blog post describing the work is here: http://geogeek.garnix.org/2012/04/faster-voronoi-diagrams-in-postgis.html
CREATE OR REPLACE FUNCTION voronoi(table_name text,geom_col text) returns SETOF record as $$
#############################################################################
#
# Voronoi diagram calculator/ Delaunay triangulator
# Translated to Python by Bill Simons
# September, 2005
#
# Additional changes by Carson Farmer added November 2010
#