Dsw21

Added plans

1. Network-Plan from Dortmund at day
2. Network-Plan from Dortmund at night
3. Rails-Plan from Dortmund

For each of them I set the location to be the "Dortmund HBF" (https://www.koordinaten-umrechner.de/decimal/51.517843,7.459272)

Steps I did in gimp (for each of these three)

• Open the pdf and set ppi to 200. Did not saw a big change between 200 and 250
• Set to 8bit: Gimp -> Image -> Mode -> Indexed -> Generate optimum palette with Maximum number of colors: 256 (not sure if this was right)
• Exported as png