OBM Index - Retired Index de l'OBM

Data Format(s): OBM Index

Coordinate system: Grid CS = Universal Transverse Mercator; Map Proj = Transverse Mercator; Horiz. Datum = NAD83; Vert. Datum = Not Applicable

An Index identifying Ontario Base Map (OBM) map tiles. These map tiles are based on a UTM (Nad83) coordinate system. The tiles come in two sizes: • 10000m by 10000m for 1:20,000 and • 5000m by 5000m for 1:10,000 These map tiles are oriented according to UTM coordinates and the map identifier references the lower left corner. The mapsheet identifier is a 13 digit number in the following format: SSZZEEEENNNNN • SS represents scale (10 = 1:10,000 and 20 = 1:20,000) • ZZ represents the UTM zone number (15, 16, 17, 18) • EEEE are the first 4 digits of the UTM easting • NNNNN are the first 5 digits of the UTM northing Eg. 2015650054500 -1:20,000 scale map (10000m x 10000m) in UTM zone 15 with the lower left at (650000,5450000) Maps on the UTM zone boundary will be trimmed by the UTM zone boundary. Historically, these map tiles were based on a UTM Nad27 (May 76) coordinate system but have been subsequently replaced by Nad83 based tiles. OBM Index has been retired.The data is no longer maintained and future maintenance will not occur.