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Mes trouvailles du jour : 3 August 2014

Sunday 3 August 2014 at 21:00

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Source: http://www.dotmana.com/weblog/2014/08/mes-trouvailles-du-jour-3-august-2014/


Mes trouvailles du jour : 2 August 2014

Saturday 2 August 2014 at 21:00

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Source: http://www.dotmana.com/weblog/2014/08/mes-trouvailles-du-jour-2-august-2014/


Mes trouvailles du jour : 31 July 2014

Thursday 31 July 2014 at 21:00

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Source: http://www.dotmana.com/weblog/2014/07/mes-trouvailles-du-jour-31-july-2014/


Mes trouvailles du jour : 30 July 2014

Wednesday 30 July 2014 at 21:00

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Source: http://www.dotmana.com/weblog/2014/07/mes-trouvailles-du-jour-30-july-2014/


Mes trouvailles du jour : 28 July 2014

Monday 28 July 2014 at 21:00

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Source: http://www.dotmana.com/weblog/2014/07/mes-trouvailles-du-jour-28-july-2014/


Mes trouvailles du jour : 23 July 2014

Wednesday 23 July 2014 at 21:00

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Source: http://www.dotmana.com/weblog/2014/07/mes-trouvailles-du-jour-23-july-2014/


Mes trouvailles du jour : 22 July 2014

Tuesday 22 July 2014 at 21:01

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Source: http://www.dotmana.com/weblog/2014/07/mes-trouvailles-du-jour-22-july-2014/


Mes trouvailles du jour : 16 July 2014

Wednesday 16 July 2014 at 21:00

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Source: http://www.dotmana.com/weblog/2014/07/mes-trouvailles-du-jour-16-july-2014/


Solder sucker/pump (the best ever)

Tuesday 15 July 2014 at 11:19

I finnaly found the best manual desolder pump, fully made of machined aluminium, made in Japan, The Engineer SS-02 Solder Sucker.

With it’s silicone nozzle, it does work very well.

Can be found on Amazon

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Source: http://www.dotmana.com/weblog/2014/07/solder-suckerpump-the-best-ever/


XCSoar: generate custom maps

Monday 14 July 2014 at 11:15

Introduction

XCSoar is an Open Source software for tactical glide computer: run it on any PDA/Smartphone/eBook and you have a powerfull computer for sailplane, paradlider and hang glider. (see previous post about adding a GPS to an eReader)

The geo file format used by XCSoar are:

We will use the latest to add custom geo referenced information on XCSoar (in this case, paragliding skyways from thermal.kk7)

Software requirement

 Processing files

#remove and create temp folder for file processing
rm -rf tmp/; mkdir tmp/
#convert PNG+PGW to GeoTiff and resize for faster processing (resize to any % or none)
gdal_translate ./skyways_all.png tmp/skyways_all.tif -outsize 50% 50%
#vectorize contour to shapefile red layer
gdal_contour tmp/skyways_all.tif tmp/skyways_all_r.shp -i 50 -b 1
#vectorize contour to shapefile green layer
gdal_contour tmp/skyways_all.tif tmp/skyways_all_g.shp -i 80 -b 2
#vectorize contour to shapefile blue layer
gdal_contour tmp/skyways_all.tif tmp/skyways_all_b.shp -i 200 -b 3

 

Visualisation with QGIS

Import from Layer->Add Vector Layer and select your 3 files

Then if everything is fine, save the 3 as Shapefiles:

Place the generated file into the XCM (XCSoar compressed archive map)

Dont forget to edit the topology.tpl to add the names of the new files:

You can edit color (RGB, 0-255)  and transparency (0-255)

The order is important: element are displayed from top to bottom (first to last)

Result

Original raster file, PNG + PGW format.

Generated shapefile maps in XCSoar (desktop version)

Same in XCSoar but eReader version optimised for black and white gray levels.

 

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Source: http://www.dotmana.com/weblog/2014/07/xcsoar-generate-custom-maps/