Title

Estimated Average Annual Temperature 

Alternate title

TEMP20 

Purpose

Generation of maps showing graduations in average annual temperature. Environmental modelling. 

Credit

Sam Ebert, DSE Wodonga Craig Hamilton, DSE Wodonga Terry McLLean, DPI Rutherglen 

Supplemental Information

Relationship to other Datasets: The layer is derived using ESOCLIM and DEM250. For a given area one can expect high correlations between RAIN<month> and DEM250 Current Design Issues: The layer is a raster dataset, ie. a GRID. To reduce disk storage it is stored as an integer value grid with precision maintained to two decimal places using: value = mm/annum * 100. Future Design Issues: As DEM250 is replaced by a higher resolution DEM it may be appropriate to re-calculate the rainfall estimates. For specific areas it will be appropriate to use additional rainfall data to update the ESOCLIM surfaces and generate higher resolution rainfall estimates. Layer design should be revised at that time. Related Documents: None ESOCLIM documentation (CLIM_GRD.DOC) ANUCLIM Users Guide 

Status

Completed  

Horizontal Accuracy

100m  

Code

4283 

Maintenance and update frequency

Irregular  

Title

DIGITAL Arc/Info Revision 7 Grid library 2 

Topic category

• Climatology, meteorology, atmosphere

Use limitation

Available under licence 

Classification

Unclassified  

Statement

Dataset Source: The dataset is an output from the ANUCLIM program, which interrogates pre-existing interpolated surfaces using, as input variables, latitude, longitude, and elevation. DEM20 is used to estimate elevation. The original surfaces are interpolations of climate variables using minimum curvature multi-dimensional splining algorithms developed by Dr. Mike Hutchinson of the Centre for Resource and Environmental Studies (CRES) ANU. Further details regarding the derivation process can be obtained from ANUCLIM Users Guide. ANUCLIM is licenced software, CRES may lay some claim to datasets derived using ANUCLIM. Dataset Originality: Derived 

Description

ArcInfo Workstation converts a GRID to an ascii file suitable for input to ANUCLIM and runs the program. A number of small, customised programs are used in this process. Output files are large (160 bytes/cell), prohibiting estimation of multiple variables for large grids in a single pass. ArcGIS Toolbox converts ANUCLIM output files to ARC/INFO grids, using standard names for the output grids. Output grids are maintained as floating. 

Classification

Unclassified  

Attribute Quality

Comments

Normally claimed to be within 5% of the actual value. This is based on a generalised cross-validation algorithm which carries out the original interpolation without each point in turn, and compares the interpolated value at that point with the observed value. 

Positional Accuracy

Comments

Precision: 10-100m Determination: Based on the input map scale for the data underpinning VICMAP_ELEVATION_DTM_20M. 

Conceptual Consistency

Missing Data

Comments

Complete for the state. Complete for all Victorian Catchment Management Authority (CMA's) areas. 

Excess Data