FactSheet2-ASCM_Legacy_Data.pdf

Alberta Survey Control Marker (ASCM) data is available for three reference frames: The North American Datum of 1927 (NAD27), the original derivation of the North American Datum of 1983 (NAD83(Original)), and the Canadian Spatial Reference System (CSRS) derivation of NAD83 (NAD83(CSRS)). This fact sheet reviews the NAD27 and NAD83(Original) datums including currency of coordinate data, coordinate differences between datums, and phasing out of ASCM integration and maintenance of coordinate data on each datum.

Data and Resources

Additional Info

Field	Value
Last Updated	April 17, 2026, 20:55 (UTC)
Created	April 17, 2026, 20:55 (UTC)
contact_email	Geoff.Banham@gov.ab.ca
contact_person	{"en": "Environment and Parks", "fr": "Environment and Parks"}
criticality_level	[]
data_dictionary	["economy"]
geographic_scope	[]
open_canada_collection	federated
open_canada_date_published	2021-04-30 00:00:00
open_canada_keywords	{"en": ["ASCM", "Alberta Survey Control", "NAD27", "NAD83"], "fr-t-en": ["ASCM", "Contrôle des enquêtes en Alberta", "NAD27", "NAD83"]}
open_canada_subject	["economics_and_industry"]
sensitivity_level	unrestricted
title_fr
update_frequency	not_planned