Step 1 - Access Window
1.1 Data SearchThe access window allows the user to define the area of interest. The page opens with the Australian coastline theme active (this layer cannot be turned off). The user can add themes by selecting them from the list of check boxes on the right of the page.
Basic navigation is done using the four buttons to the right of the map of Australia - zoom in, zoom out, pan and query (Figure 1).
There are three ways to search for geophysical datasets. Either:
Use the Lat/Long Rectangle or the Map Sheet Index window (right) side of the screen.
Or
Use the Map window (left) side of the screen.
Figure 1. Geophysical Data Delivery System Lat/Long Rectangle and Map window.
1.1.1 Lat/Long Window, Map Sheet Index (Right) Side of Screen
Search co-ordinates can be entered in the fields supplied (nb: latitudes are negative in the southern hemisphere).
Or select the name of a 1:250k Map Sheet from the drop down list to search for datasets covering that sheet.
Once the area of interest has been defined press Proceed to Download to proceed to step 2.
A new window will open.
1.1.2 Map Window (Left) Side of Screen
This window enables you to select datasets by dragging a box with the mouse over the area of interest on the map. You can use the navigation keys of this window to define a search area. Notes on the function of each navigation key will be displayed when the mouse is moved over the keys, they include:
- Zoom in: drag a box to zoom in.
- Zoom out: click to zoom out.
- Pan: click to recentre the map
- Query: drag a box to select the area for which you want data.
Once the area of interest has been defined press Proceed to Download to proceed to step 2.
A new window will open.
1.1.3 Additional Layers
The check boxes under the Additional Layers heading allow for display of the following layers on the map of Australia
- Digital Elevation - A raster image of terrain (blue low, red high)
- Magnetics - A raster image of magnetic anomalies (blue low, red high)
- Gravity - A raster image of gravity anomalies (blue low, red high)
- Geological Regions - Major geological divisions
- Population Centres - Major population centres
- Roads - Major roads network
- Railways - Major railways network
- 1:250 000 map sheets
- 1:100 000 map sheets
Note:The population, roads and railways layers will only display when the map is displayed at less than 1:3 000 000 scale.
All other layers display at all scales.
Step 2 - Data Type and Theme Window
The Data type and theme window displays the geodetic coordinates selected and allows for selection of the data type (grid or vector) and theme (magnetics, radiometrics, elevation, gravity) from the drop down lists (Figure 2).
Figure 2. Data Type and Theme window.
Select the datatype and theme then press Next to proceed to step 3.
Step 3 - Choosing datasets for download
3.1 IntroductionThis page displays all the datasets that meet the area of interest,data type and theme criteria (Figure 3).
Figure 3. Choosing gridded datasets for download.
Gridded datasets can be previewed by clicking on the Preview image link displayed under Additional Information at the bottom of each dataset (Figure 4).
Figure 4. Previewing gridded datasets.
In the image window a link vis62223.gif is displayed. Clicking on this link with the right mouse button enables the image file (in gif format) to be saved to the customer's hard drive using the Save Target As... option.
When downloading gridded datasets the Download this grid check box must be ticked. Datasets not required should not have a tick in the download check box.
For each GRID dataset selected for download there are three choices for the resolution of the supplied dataset:
- Get all data (approximate size of file in Kb)
- Subsample - get every 2nd grid cell (approximate size of file in Kb)
- Subsample - get every 10th cell (approximate size of file in Kb)
3.3 Survey Extents
The survey extents of each dataset can be displayed by clicking on Survey extent. A new window is opened with the selected survey area coloured in red (Figure 5). Click on Close window to exit this feature.
Figure 5. Previewing survey extents.
For datasets at a national scale this feature is not available and National scale dataset. No survey details available will be displayed.
3.4 Survey Metadata
The survey metadata of each dataset can be displayed by clicking on Survey metadata. A new window is opened with all available metadata relating to that survey displayed (Figure 6). Click on X in the top right corner of this window to exit this feature.
Figure 6. Viewing survey metadata.
For datasets at a national scale this feature is not available and National scale dataset. No survey details available will be displayed.
Select the radio button of your choice then press Next to proceed.
3.5 Vector Datasets
For each VECTOR dataset selected for download the dataset is supplied at the full dataset resolution.
Click on the required check boxes to select the columns required from each vector dataset selected.
This page displays all the datasets that meet the area of interest,data type and theme criteria (Figure 7).
Figure 7. Choosing vector datasets for download.
Datasets meeting the selection criteria are ordered in decreasing order of data file size.
A percentage coverage estimate is given to indicate how much of the chosen dataset is in the region of interest.
In Figure 7, the area of interest covers 0.1 degrees north-south and 1.5 degrees east-west. This slice is approximately 8% of the Dubbo magnetic point-located dataset.
Datasets to be downloaded must have the Download the dataset vector checkbox displaying a tick.
A note is displayed indicating that to select all fields of the dataset leave all field check boxes unchecked.
If a subset of fields is required select the field of interest by clicking on the check box next to the required field.
Definitions of all field names is given in the next section of this help file.
4. Field Name Definitions
Each vector dataset has standard fields that are listed for each dataset.
For magnetic data these fields are listed and defined in the following table:
| Field Name | Definition |
|---|---|
| altitudeMean | Nominal survey altitude in metres above sea level |
| bearing | Nominal line or tie bearing in degrees (0-359) measured east of true north |
| dateCode | Date line or tie was acquired - yyyymmdd |
| FID | Fiducial at sample in data record |
| fidFactor | Fiducial size in seconds (Factor to convert fiducial increment into seconds). |
| flight | Flight number for line or tie |
| groundClearance | Nominal survey altitude in metres above ground level |
| latitude | Latitude in degrees |
| LINE | Unique line or tie number |
| longitude | Longitude in degrees |
| microlevelled | As for residual and also microlevelled |
| residual | Levelled total magnetic intensity - IGRF + 5000nT |
| survey | Unique survey number identification |
| timeOfDay | Time of day at fiducial zero in seconds |
| gridflag | Gridding flag 1=ignore, 0=use. Indicates whether the data point was used in grid generation |
For radiometric data these fields are listed and defined in the following table:
| Field Name | Definition |
|---|---|
| altitude | Altitude in metres above ground level of survey aircraft |
| altitudeMean | Nominal survey altitude in metres above sea level |
| bearing | Nominal line or tie bearing in degrees (0-359) measured east of true north |
| dateCode | Date line or tie was acquired - yyyymmdd |
| FID | Fiducial at sample in data record |
| fidFactor | Fiducial size in seconds (Factor to convert fiducial increment into seconds). |
| flight | Flight number for line or tie |
| groundClearance | Nominal survey altitude in metres above ground level |
| latitude | Latitude in degrees |
| LINE | Unique line or tie number |
| longitude | Longitude in degrees |
| potassium | Potassium (counts/sec OR pctK) |
| survey | Unique survey number identification |
| thorium | Thorium (counts/sec OR ppmTh) |
| timeOfDay | Time of day at fiducial zero in seconds |
| totalcount | Total count (counts/sec OR nanoGrays/hour) |
| uranium | Uranium (counts/sec OR ppmU) |
For elevation data these fields are listed and defined in the following table:
| Field Name | Definition |
|---|---|
| altitudeMean | Nominal survey altitude in metres above sea level |
| bearing | Nominal line or tie bearing in degrees (0-359) measured east of true north |
| dateCode | Date line or tie was acquired - yyyymmdd |
| FID | Fiducial at sample in data record |
| fidFactor | Fiducial size in seconds (Factor to convert fiducial increment into seconds). |
| flight | Flight number for line or tie |
| ground | Ground elevation in metres above sea level |
| groundClearance | Nominal survey altitude in metres above ground level |
| latitude | Latitude in degrees |
| LINE | Unique line or tie number |
| longitude | Longitude in degrees |
| plane | Aircraft elevation in metres above ellipsoid |
| survey | Unique survey number identification |
| timeOfDay | Time of day at fiducial zero in seconds |
For gravity data these fields are listed and defined in the following table:
| Field Name | Definition |
|---|---|
| project | Survey number unique to each survey |
| obsno | Oracle database generated unique number |
| stationno | Station number (includes project number) |
| stationname | Name of station |
| stationtype | Type of station eg. absolute, base, control, ground, helicopter etc. |
| dlong | Longitude |
| dlat | Latitude (negative) for the southern hemisphere |
| posunits | Position units (degrees, decimal degrees) |
| acc_loc | Estimate of accuracy of the position, in metres |
| datum | Position datum |
| spheroid | Spheroid used defined by the datum |
| posmethod | Method used to position the station eg. digitised from map, GPS, etc. |
| elevation | Elevation of ground at the station (metres above sea level) |
| elevunits | Units of the elevation |
| acc_ht | Estimate of accuracy of the elevation, in metres |
| elevdatum | Elevation datum |
| elevmethod | Method used to define elevation eg. barometer, map, GPS, etc. |
| elevtype | Elevation description eg. land, marine, underground etc. |
| obsdate | Date observation was made |
| countryid | Country observation was made in eg. Aus., PNG etc. |
| grav | Observed gravity value |
| gravunits | Units of the observed gravity |
| acc_gu | Estimate of the accuracy of the observed gravity |
| gravdatum | Observed gravity datum |
| calcdate | Date gravity data were processed |
| gravmethod | Gravity meter used eg. LaCoste-Romberg, Scintrex etc. |
| gmeterid | Gravity meter serial number |
| height | Height of the gravity meter at the observation point |
| heighterror | Estimate of the accuracy of the meter height |
| heightmethod | Method used to obtain the height of the meter |
| tc | Terrain correction |
| tcerror | Terrain correction accuracy estimate |
| tcmethod | Method used to calculate the terrain corrrection eg. Hammer hand, Intrepid software etc. |
| tcdensity | Density used in the terrain correction |
| confid | Confidentiality status of the station eg. open or embargoed |
| reliab | Estimate of the overall reliability of the reading (0 = unreliable, 7 = high reliability) |
| status | Status of the station (original or active) |
| comments | Comments made when observing the station |
| parent | Shows either '-1' for the original version of the station that has been converted, or the obsno of the station from which it has been converted |
| freeair | Free Air Anomaly value |
| bouguer | Bouguer Anomaly value at 2.67 tonne/cubic metre |
For airborne gravity data these fields are listed and defined in the following table:
| Field Name | Definition |
|---|---|
| Proj | Project Number |
| Flt | Flight Number |
| Line | Line Number |
| Fid | Fiducial |
| Date | Date (yyyymmdd) |
| Brg | Bearing (degrees East of North) |
| Long | Final Longitude (degrees, GDA94) |
| Lat | Final Latitude (degrees, GDA94) |
| LatRad | Final Latitude (radians, GDA94) |
| mga53E | Final Easting (metres, GDA94,MGA53) |
| mga53N | Final Northing (metres, GDA94, MGA53) |
| GPSHt | GPS Height above WGS84 Ellipsoid (metres) |
| GPSTime | GPS time (seconds since start of day) |
| CSats | Coarse Channel Saturations (1=saturation, 0=no saturation) |
| FSats | Fine Channel Saturations (1=saturation, 0=no saturation) |
| RawFA??? | Raw Relative Free Air Anomaly (Unlevelled). WGS84, Helmert System. Units - micrometres/sec/sec** (gravity units) |
| TieLvAdj | Tie Line Levelling Adjustment. Units - micrometres/sec/sec (gravity units) |
| TieLvFA??? | Tie Line Levelled Relative Free Air Anomaly. WGS84, Helmert System. Units - micrometres/sec/sec (gravity units) |
| NoiseAdj | Noise Adjustment. Units - micrometres/sec/sec (gravity units) |
| RelFA??? | Final Relative Free Air Anomaly. WGS84, Helmert System. Units - micrometres/sec/sec (gravity units) |
| DCHelmert | DC Adjustment to Absolute Gravity. WGS84, Helmert System. Units - micrometres/sec/sec (gravity units) |
| AbsFA???HelEllips | Absolute Free Air Anomaly. WGS84, Helmert System. Units - micrometres/sec/sec (gravity units) |
| Terrain | Terrain height (metres) (AHD71) |
| NValue | N-Value AusGeoid98 (metres) |
| AHD71Ht | Height above Geoid (metres) (AHD71) |
| ObsFilt | Observed Gravity - Filtered height term (IGSN71, AHD71). Units - micrometres/sec/sec (gravity units) |
| Obs | Observed Gravity - unfiltered height term (IGSN71, AHD71). Units - micrometres/sec/sec (gravity units) |
| FA???GRS67AHDFilt | Final Absolute Free Air Anomaly (IGSN71, AHD71). Units - micrometres/sec/sec (gravity units) |
| NormBCorrFilt | Normalised Bouguer Correction, filtered to match gravity (IGSN71, AHD71). Units - micrometres/sec/sec (gravity units) |
| BullardCorrFilt | Bullard (Earth Curvature) Correction, filtered to match gravity (IGSN71, AHD71). Units - micrometres/sec/sec (gravity units) |
| B???Corr254 | Bouguer Correction, dens=2.54 (IGSN71, AHD71). Units - micrometres/sec/sec (gravity units) |
| B???Corr267 | Bouguer Correction, dens=2.67 (IGSN71, AHD71). Units - micrometres/sec/sec (gravity units) |
| NormTerr???CorrFilt | Normalised Terrain Correction, filtered to match gravity (IGSN71, AHD71). Units - micrometres/sec/sec (gravity units) |
| Terr???Corr254 | Terrain Correction, dens=2.54 (IGSN71, AHD71). Units - micrometres/sec/sec (gravity units) |
| Terr???Corr267 | Terrain Correction, dens=2.67 (IGSN71, AHD71). Units - micrometres/sec/sec (gravity units) |
| BA???sim254 | Final Absolute Simple Bouguer Anomaly (dens=2.54) (IGSN71, AHD71). Units - micrometres/sec/sec (gravity units) |
| BA???sim267 | Final Absolute Simple Bouguer Anomaly (dens=2.67) (IGSN71, AHD71). Units - micrometres/sec/sec (gravity units) |
| BA???com254 | Final Absolute Complete Bouguer Anomaly (dens=2.54) (IGSN71, AHD71). Units - micrometres/sec/sec (gravity units) |
| BA???com267 | Final Absolute Complete Bouguer Anomaly (dens=2.67) (IGSN71, AHD71). Units - micrometres/sec/sec (gravity units) |
| ??? | Filter Length 060, 080, 107 seconds |
| ** | 1 micrometre/sec/sec=0.1 mGal |
5. Submit Request
The final step in the procedure is to acknowledge reading and agreeing with the terms of the data licence and privacy statements (Figure 8).
Figure 8. Licence agreement, data usage and client registration details.
Read the licence conditions and tick the licence check box. Please also fill in the Development, Proposed Distribution of Data and Application check boxes where applicable. Please note all fields marked with an * must be filled in.
Supply your name and contact details. The supplied e-mail address is the address for delivery of the requested data.
A warning is supplied if the size if the requested dataset is greater than 200 megabytes. Files larger than 200Mb could take a long time to download on a slow internet connection.
Note: Files to be downloaded are restricted to be less than 200 megabytes in size.
For requests of datasets larger than 200 megabytes please contact Murray Richardson via e-mail murray.richardson@ga.gov.au or telephone him on (02) 6249 9229.
Click Submit Form and the user will be informed that the data request has been submitted (Figure 9).
Figure 9. Submitted request window.
When the data has been extracted and zipped you will receive an e-mail with a link to the prepared data.
The delivered e-mail will appear like the example in Figure 10.
Figure 10. E-mail indicating successful completion of data request.
Click on the link to the prepared data and select the Save this file to disk option (Figure 11). Click OK.
Figure 11. Saving the zip file containing the requested datasets.
The Save As window opens (Figure 12). It is recommended that at this stage the zip file is given a name representative of the contained dataset. Click Save.
Selecting the Open this file from its current location radio button will open the zip file as shown in Figure 14.
Figure 12. Saving the zip file to your hard drive.
The download will commence and when completed the zip file can be opened (Figure 13).
Figure 13. Download completed message.
Clicking on open will display the contents of the zip file (Figure 14).
Figure 14. An example of the contents of the downloaded zip file.
For all datasets the zip file will contain copyright information in the file Copyright_Disclaimer.txt
For gridded datafiles the filename convention is to have the airborne survey project number (Eg P569) and the dataset theme (Eg tmi for magnetics). The small g indicates a geodetic dataset is stored in the JetStream data directory
Two files are supplied when choosing gridded datasets. The gridded datafile and the associated header with a .ers extension
For vector datafiles the filename convention is to have the airborne survey project number (Eg P596) and the dataset theme (Eg MAG for magnetics)
Three files are supplied when choosing vector datasets. The '.dat' file contains the vector dataset. The '.des' file contains dataset datum and projection information. The '.dfn' file contains dataset field name definitions and formats.