AuScope GeoNetwork
NSW Geophysics Isostatic Gravity over TMI RTP Tilt
This dataset is part of the Geological Survey NSW Geophysics dataset series.
Bouguer gravity that has been isostatically corrected in pseudocolour, superimposed on a greyscale intensity layer showing tilt-filtered total magnetic intensity reduced to the pole. Isostatic correction of the gravity data removes the contribution due to Airy isostasy, the effect in which the depth of the base of the crust is greater in regions of higher topography. Variations in isostatically-corrected gravity should directly reflect differences in the geology of the crust, rather than its thickness. The tilt-filter is a variety of phase filter which, like the more familiar first vertical derivative of TMI (TMI 1VD), traces geological structures. Unlike TMI 1VD however, the tilt-filter is relatively insensitive to the depth of the source geology below the ground, making tilt-filtered TMI a useful tool for tracing geological structure below variable depths of sedimentary cover. Isostatic gravity shares the same units as Bouguer gravity (µms -2). The output of the tilt-filter is an angle, varying between -π/2 and +π/2 radians (i.e. -90° to +90°). This is not related to the strength of the magnetic anomaly, but the spacing between contours of equal tilt angle is related to the depth of the source.
Simple
Identification info
- Status
- Point of contact
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Role Organisation Electronic mail address Point of contact Geological Survey of NSW
- Spatial representation type
- Topic category
-
- Geoscientific information
Extent
Extent
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- Maintenance and update frequency
- As needed
- Theme
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WCS
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ImageMosaic
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- Place
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World
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- Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research
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Earth Sciences
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Resource constraints
- Use limitation
- Access constraints
- Licence Unrestricted
- Use constraints
- Licence Unrestricted
- Language
- English
- Character encoding
- UTF8
Distribution Information
- OnLine resource
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geophys:IsoGravTilt
NSW Geophysics Isostatic Gravity over TMI RTP Tilt
Resource lineage
- Hierarchy level
- Dataset
Reference System Information
- Reference system identifier
- EPSG:4326
Reference System Information
- Reference system identifier
- CRS:84
Metadata
- Metadata identifier
- urn:uuid/791e7e127b544081f9f178b92c947c117a2f5aa6
- Language
- English
- Character encoding
- anyValidURI
- Contact
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Role Organisation Electronic mail address Point of contact Geological Survey of NSW
Point of contact
Type of resource
- Resource type
- Dataset
Metadata linkage
- Function
- Complete Metadata
- Metadata linkage
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http://portal.auscope.org/geonetwork/srv/api/records/177abe2c-9efe-4fd2-a66e-0f1e099c3047
- Date info (Revision)
- 2023-08-18T07:56:01
- Date info (Creation)
- 2025-09-03T10:15:04
Metadata standard
- Title
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ISO 19115-3
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