Estimated Average Annual Rainfall (20m grid)

dataset: RAIN20
Estimated long-term mean annual rainfall interpolated to a 20m grid cell using the VICMAP_ELEVATION_DTM_20M layer and the ANUCLIM software.
 
Citation proposal Citation proposal
(2010)

Estimated Average Annual Rainfall (20m grid)

Department of Environment, Land, Water & Planning
 

Description

Title
Estimated Average Annual Rainfall (20m grid) 
Alternate title
RAIN20 
Resource Type
Dataset  
Purpose
Generation of maps showing graduations in average annual rainfall. Generation of maps of isohyets. Environmental modelling species distributions recharge areas site suitability analyses catchment analyses other 
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 Related Documents: None ESOCLIM documentation (CLIM_GRD.DOC) ANUCLIM Users Guide 
Status
Completed  
 
 

Temporal

Time period
2009-07-012009-09-01 
 
 

Spatial

Spatial representation type
Grid  
Horizontal Accuracy
100m  
Code
4283 
Description
General - Victoria 
N
S
E
W


 

 

Maintenance

Maintenance and update frequency
Irregular  
 
 

Format

Title
DIGITAL Arc/Info Revision 7 Grid library 2 
 
 

Contacts

  Point of contact

Cited responsible party  

No information provided.

Cited responsible party  

No information provided.

Cited responsible party  

No information provided.
 
 

Keywords

Topic category
  • Climatology, meteorology, atmosphere
 
 

Resource Constraints

Use limitation
Available under licence 
Classification
Unclassified  
 
 

Lineage

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. VICMAP_ELEVATION_DTM_20M 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. 
 
 

Metadata Constraints

Classification
Unclassified  
 
 

Quality

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
 
 

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