Forestry and Agrifoods
Several years ago it became evident that photo interpretation in the second inventory cycle carried out in the 90's is significantly more detailed than in the first cycle carried out in the 70's and 80's. To estimate the affect of this on production levels in the Mapping Section a small study was conducted to compare the 1977-1978 inventory with the 1993-1994 inventory in District 16. The study demonstrated that more detailed interpretation has significantly increased the costs (time and money) to create digital Forest Inventory Maps.
A comparison was made between the 1977-1978 inventory and the 1993-1994 inventory for map sheet 50. Three things were compared:
These results are depicted in the following table
|Year of Photography||Arc Length||Polygons||Forest Stands|
Clearly there has been a significant increase in the level of detail on FI maps created today as compared to twenty years ago, and this has the following implications:
There are several possible reasons why interpretation has become more detailed.
The increased detail is happening at a time when there are more demands to cut costs and improve production times. We must ask ourselves whether we need such detailed maps to effectively carry out ecosystem management? If indeed the detail is required, we must be prepared to commit resources to deal with the extra work effort.