The following definitions have the form "name (value constraints) - description"
Sheet (two or three digits) - aka "Map Numbers" are blocks of approximately 4,915,200 hectares.
Map Units Subdivision ([A-P]) - each sheet is subdivided further into 16 blocks, approximately 307,200 hectares
Map Sheet Unit ([1-16]) - each map unit is subdivided further into 16 blocks, approximately 19,200 hectares
Blocks ([A-L]) - each map sheet unit is subdivided further into 12 blocks, approximately 1600 hectares
Units ([1-100]*) - each block is finally divided into 100 units, approximately 64 hectares
Two subsets of the complete NTS format is supported:
- Sheet and Map Unit Subdivision
- Sheet, Map Unit Subdivision, and Map Sheet Unit
Note that "Blocks" and "Units" are currently not supported on geogratis and are ignored on the query.
National Topographic System (NTS)
The following definitions have the form "name (value constraints) - description"
Sheet (two or three digits) - aka "Map Numbers" are blocks of approximately 4,915,200 hectares. Map Units Subdivision ([A-P]) - each sheet is subdivided further into 16 blocks, approximately 307,200 hectares Map Sheet Unit ([1-16]) - each map unit is subdivided further into 16 blocks, approximately 19,200 hectares Blocks ([A-L]) - each map sheet unit is subdivided further into 12 blocks, approximately 1600 hectares Units ([1-100]*) - each block is finally divided into 100 units, approximately 64 hectares
Two subsets of the complete NTS format is supported: - Sheet and Map Unit Subdivision - Sheet, Map Unit Subdivision, and Map Sheet Unit
Note that "Blocks" and "Units" are currently not supported on geogratis and are ignored on the query.