Table 3.
Primary Data–Gathering Approach | n (% of Total) | References by Location of Study Area | ||||
---|---|---|---|---|---|---|
Canada | Denmark | Scotland | United Kingdom | U.S. | ||
Ground-Truthed, GPS-assisted | 4 (21) | 17 | 12,14,18 | |||
On-Site Verification | ||||||
With Systematic Canvass | 2 (10) | 21,22 | ||||
With Systematic Canvass, GPS-assisted | 1 (5) | 19 | ||||
Without Systematic Canvass | 4 (21) | 26 | 29 | 27 | 24 | |
Without Systematic Canvass, GPS-assisted | 2 (10) | 13,23 | ||||
Targeted Observation, GPS-assisted | 3 (16) | 25 | 20,30 | |||
Targeted Observational Field Data | 3 (16) | 28,31,32 |