Title

Murray Basin - Depth To Basement (1:1,000,000) 

Alternate title

DEPTH_TO_BASEMENT_MURRAY_BASIN 

Purpose

To provide a 2D representation of the depth to Palaeozoic bedrock in the Victorian portion of the Murray Basin 

Supplemental Information

History: Added to VSDLLD 13/03/2018 Related Documents: GSV Geoscience GIS Data Dictionary.doc - Maintained by Graham Callaway 

Status

Completed  

Horizontal Accuracy

250m  

Code

4283 

Maintenance and update frequency

Irregular  

Topic category

• Geoscientific information

Use limitation

Creative Commons Attribution Version 4.0 (international licence). 

Classification

Unclassified  

Statement

Dataset Source: Derived from published 3D modelling inhouse at Dept. of Primary Industries Dataset Originality: Derived 

Description

1. Shapefile for 50m contours generated by Mark McLean using 3d modelling in MGA54 2. Create working GDB at \\p00401\p_gsv\projects\\Solid Geology of Victoria\Depth_to_basement.gdb with 2 feature classes + topology 3. Load contours into \\p00401\p_gsv\projects\Solid Geology of Victoria\Depth_to_basement.gdb\DepthToBasement50m\Basement_contour from supplied shapefile (copy at \\p00401\p_gsv\projects\Solid Geology of Victoria\2013_02_20_murray_bsmt_contour_50.shp) 4. Select all Basement_contour arcs in arcmap and generalise (tolerance 0.001 dd) 5. Select Basement_contour arcs < 0.008dd and delete 6. Clean up arcs that look ugly (see below) and extend/ clip arcs to VMINDEX.FR_FRAMEWORK_AREA_LINE along Victorian border. 7. Check for dangles using the topology 8. Select all arcs + border arcs and construct polygons into \\p00401\p_gsv\projects\Solid Geology of Victoria\Depth_to_basement.gdb\DepthToBasement50m\Basement_depth 9. Manually populate DEPTH_TO_BASEMENT field in Basement_depth or use a spatial location selection starting with the smallest value (ie select all polygons that are touched by the selected arcs = 50m. You then have to recalculate the polygons that don't match as you will have selected both the 0-50m polygons as well as the 50-100m polygons). Watch out for depression contours! If you colour the polygons you will be able to see the wrong ones graphically. 10. Calculate the other fields for minimum and maximum depth to basement (numeric fields created to select from in Geovic - the DEPTH_TO_BASEMENT field is a text data type so can't be used for arithmetic selections) 11. When you are happy that you have coded all the polygons correctly load the shapes into a feature class you created at Database Connections\spivpro_gsv.sde\GSV.DEPTH_TO_BASEMENT (make sure it's SDO_GEOMETRY when you create it) 12. Create an sld file to symbolise the feature class in Geoserver. If you have symbolised polygons in arcmap you can convert the colours to hexadecimal values for input into your sld file. 13. Get someone with oracle rights to enable permissions and synonyms on the polygon feature class GSV.DEPTH_TO_BASEMENT to WXS_VIEWER 

Classification

Unclassified  

Attribute Quality

Comments

Good 

Positional Accuracy

Comments

Generally accurate to 1:1,000,000 

Conceptual Consistency

Comments

Good 

Missing Data

Comments

1:1,000,000 complete Completeness Verification: Metadata Custodian Review Frequency: yearly Metadata Last Reviewed by Custodian: March 2013 

Excess Data

Comments

1:1,000,000 fair