b'Geophysics in the surveysNewsTable 1.Statistics for requests through the GADDS API for the period 1 July 2021- 30 June 2022.Summary National GA TAS WA SA NSW VIC QLD NT Total % %aggregates surveys surveys surveys surveys surveys surveys surveys surveys aggregates surveys# requests 3621# unique users 864# downloads 7231 1612 137 1222 376 513 336 925 301 12653 57.1% 42.9%# files 101 580 61 499 192 219 146 287 193 2278 4.4% 95.6%Files by theme Total files % theme Total% themerequestsgravity 39 124 18 107 46 34 35 70 22 495 22.3% 3398 27.2%radiometrics 13 205 18 163 71 48 47 85 78 728 32.7% 3214 25.7%magnetics 43 191 18 99 65 82 60 81 83 722 32.5% 4552 36.4%elevation 6 60 7 103 9 39 4 40 10 278 12.5% 1331 10.7%Files by format Total files % format Total% requests formatgrid 59 242 32 325 100 134 45 200 96 1233 54.2% 8632 68.2%line/pt 0 338 29 174 85 85 97 87 97 992 43.6% 2200 17.4%image 42 0 0 0 7 0 0 0 0 49 2.2% 1817 14.4%Acquisition is expected to commence inin eastern South Australia and westerngreat GA system (and particularly the September and run through to June ofVictoria where the gravity data is low innew one), we can confirm that we have next year. It will involve airborne gravityquality and distribution. This degradesdelivered over 12 000 files of geophysical surveying to deliver spatial resolution ofthe accuracy of the geoid model in thesedata to 864 users since 1 July, 2021.5 km or shorter. The survey will cover aregions and thus the ability to derive total area of approximately 192 000 km2.accurate heights from GNSS observations.Additionally:Hence, the initial need for airborne gravity Details of data releases will be providedsurvey data to be collected over targetedThere was close to a 60-40 split in due course. regions of interest is to enhance thebetween National aggregate and #. The expansion in application andgeoid model and thereby optimise heightsurvey downloads.reliance on Global Navigation Satellitedetermination from GNSS positioning.Magnetics and radiometrics are the System technology has increased the(DrAnna Riddell, Director, Geodesy,most popular themes. This is markedly need to support accurate and reliableNational Geodesy Section, Geosciencedifferent from the previous year when determination of real-world heights (suchAustralia, 2022) gravity and radiometrics were the most as Australian Height Datum) from GNSSpopular themes.positioning. This is achieved throughGADDS statistics Close to 20% of the requests are for application of a geoid model (such assurvey line and point data; most of the AUSGeoid2020), which is essential for theAnd finally, with the end of Financial Yearrequests involve grids and images.observation of real-world heights frombehind us, I just wanted to share some GNSS positioning. Geophysical Archive and Data DeliveryMike Barlow The geoid model is derived from a national(GADDS) statistics with you (Table 1).Geoscience Australia database of gravity data. There are regionsIf you ever doubted the value of thisMike.Barlow@ga.gov.auAUGUST 2022 PREVIEW 18'