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| Survey types |
Index map of survey coverage [PDF, 7.5 Mb, viewer]
Survey data are generally classified by the line spacing that was used for the airborne survey:
| Line Spacing (m) |
Line-kilometres | Area (km2) |
Map Sheets |
Scale | Description |
|---|---|---|---|---|---|
| ~25 000 | 36 000 | ??? | 10 | 1:1M | These surveys were carried out as part of the Uranium Reconnaissance Program (URP) in the 1970's. The data are suitable for 1:1M scale. |
| 5000 | 1 200 000 | ??? | 205 | 1:250k | These surveys were carried out as reconnaissance surveys. The data are suitable for 1:250k scale. |
| 1000, 2000 & 2500 | 250 000 | ??? | 50 | 1:50k | This is the 'standard' line spacing for most surveys. It represents the best combination of economy and detailed information. |
| <=500 | 50 000 | ??? | 100 | small areas | These are 'detail' surveys, that are used for environmental studies (nuclear waste disposal sites) and detailed geological mapping/studies of mineral deposits and structural features. |
| Total | 1 536 000 | ??? |
| Survey coverages |
The NATGAM database is continually being updated, with ongoing data recovery and reformatting.
The amount of coverage available (as of 2001-07-01) is shown below.
 Ternary radioelement map of Canada showing coverage of NATGAM surveys. |
| 2006-09-20 |