The Galaxy map provides tools for filtering the type of system population, allegiance, government, economy, star class, cartographics shop and trade data shop.
There is also options for selecting a minimum and maximum population size.
To view these options, select Map instead of Realistic.
The trade routes are coloured routes which are linked to the commodity type. So, you could go through the commodity list and remove those goods that are too low to trade. It can also be useful when locating commodities for missions.
One very useful option is to select the fastest route instead of the most economical. Doing this would save many jumps on a long journey.