To be more specific, I find myself at a disadvantage when the other two races can scan to view your position, unit composition and plan when to make the best engagement possible. Protoss will simply get a thorough idea of what is going on through observer vision, but as zerg I am struggling to know for sure when to engage.
Sending a ling into the army to have a look is only mildy useful until the first seige tank/collosus shot, and changelings suffer from similar problems (especially vs protoss with observer escorts). How far back does the siege tank spread go? Are there spellcasters further back?
Is there any way to reliably check these things before a battle? Any help is greatly appreciated
