GEOPY-2574: Speed up active from topography algorithm

[domfournier]

GEOPY-2574 - Speed up active from topography algorithm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.98%. Comparing base (c3e74e4) to head (c8cefbb).
⚠️ Report is 9 commits behind head on release/ga-4.7.

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/ga-4.7     #172      +/-   ##
==================================================
+ Coverage           85.68%   85.98%   +0.30%     
==================================================
  Files                  19       19              
  Lines                1090     1092       +2     
  Branches              147      147              
==================================================
+ Hits                  934      939       +5     
+ Misses                116      114       -2     
+ Partials               40       39       -1     

Files with missing lines	Coverage Δ
geoapps_utils/utils/locations.py	91.42% <100.00%> (+4.66%)	⬆️

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[sebhmg]

please see comments (small things)