OK, for clarity....unlike other house systems, the topocentric system basically measures from the surface of the earth, not the center of the earth. This small adjustment takes into account what the local observer is seeing from their perspective rather than from a geocentric perspective.
It does seem to clear up the
extreme latitude problem but, is needless anywhere else since it will simply look just like most any other house system you use (i.e. Regio, Placidus, Porph, etc)
For further clarity, most all the house systems pretty much resemble each other at less than extreme latitudes so, the whole argument of what house system to use is really pointless since they all vary by only a degree or two. I did a side by side comparison for about 45 latitude here if you want numbers :
http://astrologyweekly.com/forum/showthread.php?t=42622
Meridian, Equal and Whole are exceptions to this, of course.