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Welcome to Alidade!

Alidade aims to serve you, the geospatial professional. The geospatial industries of geographic information systems (GIS), civil engineering, mapping and surveying share many common goals and needs. Professionals, both licensed and certified, in these fields need good training resources. The aim of Alidade is to provide straightforward learning resources that all geospatial professionals can use.
State Plane Coordinate Systems
Geodesy Links
GPS Links
Errors & Accuracy
GIS Links
Land Surveying Links

IPLSA Exam Review Seminars
Safety
Sample Videos
About the name Alidade

About Todd W. Horton, PE, PLS