Title

Psyllid Affected Areas 

Alternate title

PSYLLID25 

Purpose

PSYLLID25 is used to target areas affected psyllids when planning control works and monitoring programs. This layer may be overlayed with temperature, rainfall, elevation and aspect to determine correlations and to facilitate predictive modelling. 

Credit

Darren McKinty, Debbie Edwards, Geoff Pike (Erica), Psyllid Working Group 

Supplemental Information

Relationship to other Datasets: Boundaries of polygons may follow line work contained in TOPO25, HYDRO25, ROAD25 and FOREST25. PSYLLID25 will be used with TOPO25 (elevation and aspect) and climatic data to determine correlations, if any. FOREST25 could be used to check accuracy of psyllid mapping as attacks usually occur in E.regnens. Current Design Issues: This layer has been simplified and contains only items and valid codes for which data is currently or is very likely to be available. Future Design Issues: This layer will be reviewed by the soon to be appointed Project Officer, Psyllid Working Group. Items that should be considered (according to Debbie Edwards and Darren McKinty) are: psyl_mort,3,3,I = Percentage of dead trees within the area due to psyllid attack fungi,1,1,I = Type of fungi (fungi.lut) fung_mort,3,3,I = Percentage of dead trees within the area due to fungal attack. psyl_age,1,1I = Age of psyllid (psyl_age.lut): egg, 1-5 larval instars and adult. Some tracking of origin of line work ie. TOPO25, HYDRO25 may need to be implemented as for BLOCK25. Creation of multiple layers to store history ie 1 per year but this may not be necessary in ARC/INFO Version 7. Related Documents: None 

Status

Completed  

Horizontal Accuracy

25m  

Maintenance and update frequency

Annually  

Title

DIGITAL Arc/Info Revision 7 Librarian layer 1 

Topic category

• Farming
• Health

Classification

Unclassified  

Statement

Dataset Source: Boundaries of polygons may follow line work contained in TOPO25, HYDRO25, ROAD25 and FOREST25. Dataset Originality: Primary & Derived 

Description

Collection Method: Remote Sensed - Satellite Remote Sensed - Airborne Field Measurements Aerial Observation Aerial Photo Interpretation 

Description

Currently all data has been capture using aerial observation. From the aircraft, the observer has mapped the infestation boundary and intensity onto a 1:25 000 topographic map with Forest Block boundaries clearly delineated. This data was then transferred onto a stable base and digitised pulling may of the lines from layers TOPO25, HYDRO25, ROAD25 and FOREST25. 

Classification

Unclassified  

Attribute Quality

Comments

Ground truthing is required to verify boundaries and intensity. 

Positional Accuracy

Comments

Precision: 10 m. to 100 m. Determination: Deductive Estimate 

Conceptual Consistency

Comments

See Layer Attribute Documentation 

Missing Data

Comments

Complete for selected blocks. Complete for selected blocks. 

Excess Data