Aerial survey results

map of 2003 aerial survey results

The DNR is lucky to have Resource Assessment's Bill Befort and his crack team of aerial sketch-mappers who provide us with a statewide survey of forest health problems each summer. The US Forest Service also shares their aerial survey maps of the national forests, too. This year Resource Assessment expanded their repertoire to include polygon digitization and creation of the final product, a digital file of all mapped polygons and their attributes. This allows foresters to check out forest health problems at several scales, Region, Area, county and township. Here is the statewide summary of sketch-mapped polygons and a map with all of the forest health polygons mapped.

Tabular summary: Aerial Survey - 2003

Damaging agent

Acres
mapped

Comments

Forest tent caterpillar

2,254,000

Last year of widespread defoliation

Spruce budworm

34,600

Acreage increased significantly

Jack pine budworm

18,400

New outbreak this year

Flooding

8,000

 

Oak wilt

4,500

Additional photography project done to pin point affected acres

Two-lined chestnut borer

4,300

Additional photography project done to create incidence model

Larch casebearer

1,600

 

Bark beetles

1,200

 

Dutch elm disease

75

 

Unknown dead larch

6,000

Probably caused by larch beetle

Unknown dead hardwoods

5,700

 

Unknown dead softwoods

2,200

 

Unknown defoliated hardwoods

6,900

 

TOTAL

2,347,475