ALTA/ASCM (American Land Title Association/American Congress on Surveying and Mapping - Land Title Survey.)
An ALTA/ACSM Survey is the most comprehensive type of survey available. It covers all of the aspects of the boundary and improvement location survey as well as identification of any additional evidence of possession or use which could be adverse to the interests of the purchaser. This type of survey is normally only performed on commercial properties due to the cost associated with the extensive work involved.

Current ALTA Survey Standards (.pdf)

Optional "Table A" specifications for ALTA Surveys (.pdf)