Web services > Polygon data > Washington (State) > 2025-present

Foliar Diseases [Washington (State)]

State of Washington Geospatial Open Data Portal · 2026 Full Details

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Title
Foliar Diseases [Washington (State)]
Description
Every summer for the past seventy-six years, an insect and disease aerial detection survey has been flown over all forested acres in Washington state (except where noted in the digital data by large 'NF' (not flown) areas). This survey is a cooperative effort between the U.S. Forest Service and the WDNR where two trained aerial surveyors sit on either side of a high-wing plane and sketch forest damage observed below. The primary mission of the survey is to record recently killed and defoliated groups of trees throughout the state, and to continually build a historical record of forest health trends. The majority of damage found is caused by insect and disease damage agents; however, trees killed by root disease and early spring feeding of black bears, or by abiotic events such as winter storms, fires, floods and landslides are recorded as well. Current defoliation can be detected as soon as the affected foliage changes color that year. However, whole tree mortality is not current since only flagged trees (i.e., trees which have a bright red, orange, or yellow foliage color) are recorded. This means that trees killed the year of the survey will not have changed color yet and a one-year lag time results. Only trees exhibiting distinctive colors or "signatures" are documented. For example, when bark beetle damage is spotted while surveying, a polygon is drawn on a digitized map of the size and location of the damage. The polygon is then labeled with the appropriate damage agent (i.e., code: 8 for Western pine beetle) and the percentage of trees affected within five damage severity categories. It is an educated guess as to the causal agent. We therefore use ground surveys to reinforce our estimates as much as possible. No vertical data is recorded.
Creator
Washington State Department of Natural Resources
Publisher
State of Washington Geospatial Open Data Portal
Temporal Coverage
Last Modified: 2026-01-08
Date Issued
2025-07-24
Rights
This digital data and metadata, (hereinafter collectively referred to as the "information" are provided on an "AS IS"; "AS AVAILABLE"; and "WITH ALL FAULTS" basis. Neither Department of Natural Resources nor any of its officials and employees makes any warranty of any kind for this information, express or implied, including but not limited to any warranties of merchantability or fitness for a particular purpose, nor shall the distribution of this information constitute any warranty. The information is collected from various sources and will change over time without notice. DNR and its officials and employees assume no responsibility or legal liability for the accuracy, completeness, reliability, timeliness, or usefulness of any of the information provided nor do they represent that the use of any of the information will not infringe privately owned rights. The information is not intended to constitute advice nor is it to be used as a substitute for specific advice from a licensed professional. You should not act (or refrain from acting) based upon the information without independently verifying the information and, as necessary, obtaining professional advice regarding your particular facts and circumstances. References to any specific commercial product, process, and service by trade name, trademark, or manufacturer do not constitute or imply endorsement, recommendation, or favoring by DNR and its officials and employees. IN NO EVENT WILL DNR BE LIABLE TO YOU OR ANY THIRD PARTY FOR ANY DAMAGES ARISING OUT OF THE USE OF OR INABILITY TO USE THE DIGITAL DATA, EVEN IF DNR IS ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Access Rights
Public
Format
ArcGIS DynamicMapLayer
Language
English
Date Added
August 10, 2025
Provenance Statement
The metadata for this resource was last retrieved from State of Washington Geospatial Open Data Portal on 2026-01-08.

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Cite and Reference

  • Citation
    Washington State Department of Natural Resources (2025). Foliar Diseases [Washington (State)]. State of Washington Geospatial Open Data Portal. https://geo.wa.gov/datasets/7c6f277769d743919368e115c4e53381_3 (web service)
  • BTAA Geoportal Link

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