Clément Ronzon ClemRz

Battery pack capacity formula

Use this formula to compute a lithium-ion battery pack capacity:

% = 1.25 * v / s - 3.875

Where % is the remaining capacity as a fraction of 1 (multiply by 100 to get a percentage), v is the pack voltage and s is the number of cells in series.

Resize images and put them into a single pdf

First install ImageMagick

Run the following commands:

mogrify -resize 663x1024 *.jpg
for i in `seq 0 26`; do convert $(printf "filename-%03d" $i).jpg $(printf "filename-%03d" $i).pdf; done  
gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=temp.pdf $(for i in `seq 0 26`; do printf "filename-%03d.pdf " $i; done)

Extracts a CSV speed, elevation and distance table from a KML file.

This is a Python script that extracts a table with several columns from a KML file: timestamp, elapsed time, distance, speed, elevation, elev. gain, elev. loss and stop time.

How to use this script

Open a terminal and run:

python3 script.py /path/to/your/file.kml

Trail maps production with QGIS

Table of Content

I. Setup
II. Create a map from an existing map
III. Add layers
- III.a. DEM
  - III.a.1. Contour Lines
  - III.a.2. Hill Shades

How to print a 1:1 (or any scale) 2D graphic from a Sketchup Make 3D model

Export your model to STL file (Install the Sketchup STL extension: https://extensions.sketchup.com/en/content/sketchup-stl)
Import the STL file in a new TinkerCAD model: https://www.tinkercad.com
Export the TinkerCAD model to 2D SVG graphic
Open the SVG file in Inkscape
Make sure you page is correctly set up and print to the desired scale

The End

How to add more file fields to the GPS Visualizer convertion tool

Go to http://www.gpsvisualizer.com/ and choose a file converter
Click the link Show additional file input boxes
Open the developper tool's console
Copy and paste the script below

Enjoy!

How to download the KML from an AllTrails page without PRO account

Open a trail page in your favourite browser, for instance: https://www.alltrails.com/explore/trail/us/arizona/south-kaibab-to-phantom-ranch-to-bright-angel-trail
Open the developper console
copy and paste the script below (script.js)
execute it, you should see a KML file being downloaded

The last file below is for advanced users.

Enjoy!

How to import OSM vectorial data into QGIS

Follow the steps:

Go to https://www.openstreetmap.org and log in
On the right, open the layer menu and check the public GPS trace
On the top-left corner click on "Export"
Enter the coordinates
Click on Export button
Open the file with a text editor

How to add vectorial PALSAR-2 Global Forest data in QGIS

Follow those simple steps:

Go to http://www.eorc.jaxa.jp/ALOS/en/palsar_fnf/data/index.htm and select latest FNF map.
Select the region and sub-region
Download the FNF file
In your QGIS project open the file that has no extension
If you need to merge several FNF files, save them first as GTIFF (raster) and use the merge tool in the raster menu
In the raster menu select Conversion > Polygonize, remember to check the "field name" checkbox

	from PyQt4.QtCore import QSettings

	class Selection(QgsMapTool):
	def __init__(self, canvas, layer):
	QgsMapTool.__init__(self, canvas)
	self.canvas = canvas
	self.layer = layer

	def getFeatureRequest(self):
	sr = self.searchRadiusMU(self.canvas)