Forest Health Survey 2017, Minnesota
Go to Section:- Overview
- Data Quality
- Data Organization
- Coordinate System
- Attributes
- Distribution - Get Data
- Metadata Reference
Section 1: Overview
Originator:Minnesota Department of Natural Resources (MNDNR) - Division of Forestry, Forest Health Unit and US Forest Service
Title:
Forest Health Survey 2017, Minnesota
Abstract:
This dataset shows where largescale tree canopy damage was delineated in aerial surveys in 2017. Forests in northern and central Minnesota were surveyed (Flight Map). Forests south of northern Washington and Anoka counties were not surveyed. Only forest disturbances were mapped if they were occurring at the time of the flight. Flights occurred from late June to late August. The following were the most common disturbers, listed from largest area disturbed to smallest area disturbed: eastern larch beetle, spruce budworm, forest tent caterpillar, larch casebearer, aspen decline, shoot blight on northern white cedar, flooding, wind, jack pine budworm, black ash decline, twolined chestnut borer, hail, bark beetles on pines, and oak wilt. Not included in this dataset are unknown causes of damage.
Purpose:
The purpose of this survey was to indicate where significant and highly noticeable tree damage occurred. Another purpose of this survey was to monitor general trends in forest health conditions (previous years' aerial survey data is available through the Forest Health unit of the MNDNR).
Time Period of Content Date:
03/19/2018
Currentness Reference:
Time Period of Content date indicates the date which the user can be confident of accuracy and completeness of the dataset.
Progress:
Complete
Maintenance and Update Frequency:
None Planned
Spatial Extent of Data:
The northern 2/3 of Minnesota was surveyed (Flight Map). Specifically, all or most of the forests in the following counties were surveyed: AITKIN, ANOKA, BECKER, BELTRAMI, BENTON, CARLTON, CASS, CHISAGO, CLEARWATER, CROW WING, HUBBARD, ISANTI, ITASCA, KANABEC, KOOCHICHING, LAKE, LAKE OF THE WOODS, MAHNOMEN, MARSHALL, MILLE LACS, MORRISON, OTTER TAIL, PENNINGTON, PINE, POLK, ROSEAU, SHERBURNE, ST. LOUIS, TODD, WADENA, WASHINGTON. Note that Cook County and northwest St. Louis County were not surveyed.
Bounding Coordinates:
-97.23
-89.53
49.37
43.5
Place Keywords:
Minnesota
Theme Keywords:
forest health, tree health, tree damage, budworm, caterpillar, oak wilt, insects, diseases
Theme Keyword Thesaurus:
Access Constraints:
None
Use Constraints:
Use of the data are constrained only by the MNDNR GIS Data License Agreement. See the Distribution Liability section below for a link.
Contact Person Information:
Brian Schwingle,
Regional Forest Health Specialist
Minnesota DNR - Forestry
1200 Warner Rd
Saint Paul,
MN
55106
Phone: 651-259-5821
Email: brian.schwingle@state.mn.us
Section 2: Data Quality
Attribute Accuracy:
Attribute table values are recorded in flight and double-checked afterward for any obvious errors and to ensure consistency. Some polygons were created from ground surveys after flights.
Logical Consistency:
Completeness:
Caveats about this dataset:
- Many major forest problems cannot be identified from aircraft. For example, Armillaria root disease, white pine blister rust, and eastern dwarf mistletoe are not included in aerial surveys.
- Many concerning forest problems at low levels cannot be reliably seen from aircraft, such as oak wilt and emerald ash borer.
- Dutch elm disease is very common but not surveyed.
- Hardwood declines are extremely difficult to see and survey consistently. Decline data is not reliable.
- Most polygons are not ground-truthed.
- Affected locations (polygons) are generally within 100 m of reality
- Major canopy disturbers can be missed if flight timing does not coincide with an ephemeral disturber (e.g. tent caterpillars, frost damage, budworm defoliation, etc.).
- Major canopy disturbers can be missed if they lie farther away from flight transects. Flight transects generally go east-west and there are three to six miles between transects.
- Not all parts of Minnesota are surveyed every year.
- Pattern of damage can be scattered or clumped in any given polygon.
- Generally, only new mortality is recorded.
- Grid cells (boxes) are used to mark where certain disturbers are widespread and difficult to delineate (e.g. oak wilt). The attribute information in grid cells indicates how extensive the damage is.
Horizontal Positional Accuracy:
Polygons should generally be within 100 meters of actual problems. However, most of them were not ground-truthed.
Lineage:
Section 3: Spatial Data Organization (not used in this metadata)
Section 4: Coordinate System
Horizontal Coordinate Scheme:
Universal Transverse Mercator
UTM Zone Number:
15
Horizontal Datum:
NAD83
Horizontal Units:
meters
Vertical Datum:
Vertical Units:
Depth Datum:
Depth Units:
Section 5: Attributes
Overview:
Detailed Citation:
Table Detail:
2017 Forest Health Aerial Survey - Contains information on damage to forests in 2017| Field Name | Valid Values | Definition | Definition Source |
|---|
| DATE_CREATED | - | The date that the polygon was created | |
| HOST | - | The host species with damage | |
| HOST GROUP | - | If multiple hosts are impacted, or if host species couldn't be identified, the general group of species affected. | |
| CAUSE_OF_DAMAGE | - | The cause of the damage | |
| DAMAGE_TYPE | - | The type of damage | |
| PERCENT_AFFECTED | - | The percentage of forest cover within the polygon that is showing the damage. | |
| NOTES | - | Notes made in flight, from ground checks, or from data review sessions | |
| ACRES | - | The acreage of the polygon | |
Section 6: Distribution
Publisher:
Minnesota Department of Natural Resources (MNDNR)
Publication Date:
11/14/2017
Contact Person Information:
Zeb Thomas,
GIS Data Systems Coordinator
Minnesota Department of Natural Resources
500 Lafayette Rd
Saint Paul,
MN
55155
Phone: 651-259-5637
Email: zeb.thomas@state.mn.us
Distributor's Data Set Identifier:
env_forest_health_survey_2017
Ordering Instructions:
Please visit the download page for this dataset on the Minnesota Geospatial Commons website using the web link below (Online Linkage). Online Linkage: I AGREE
to the notice in "Distribution Liability" above. Clicking to agree will either begin the download process, link to a service, or provide more instructions. See "Ordering Instructions" above for details.
Section 7: Metadata Reference
Metadata Date:
11/14/2017
Contact Person Information:
Brian Schwingle,
Regional Forest Health Specialist
Minnesota DNR - Forestry
1200 Warner Rd
Saint Paul,
MN
55106
Phone: 651-259-5821
Email: brian.schwingle@state.mn.us
Metadata Standard Name:
Minnesota Geographic Metadata Guidelines
Metadata Standard Version:
1.2
