Blackall Airborne Gravity Gradiometry Survey, 2024

The Blackall Airborne Gravity Gradiometer (AGG) survey of Central Queensland was flown between March 11th to 6th April 2024. Contracted to Xcalibur Smart Mapping, Geoscience Australia undertook the project management, contract management and quality control on behalf of the Geological Survey of Queensland. The located data, gridded data and quality control reports are contained within this record.Survey area was centered on longitude 147° 21’ E and latitude 25° 16’ S to the south of Blackall. A total of 34 production flights were flown for a combined total of 15,705.4 line kilometres of data and acquired on 1000 m line spacing at 100 m nominal terrain clearance. Quality control was performed by airborne gravity consultant Dr Mark Dransfield on behalf of Geoscience Australia, with his report included here.The survey was designed to supplement the regional legacy ground gravity data and improve the definition of gravimetric anomalies in the region. In addition, the AGG survey will provide better understanding of the cover sequence thickness and characteristics of the underlying basement geology.The data will be released by the Geological Survey of Queensland and can be found at: https://geoscience.data.qld.gov.au/data/gravity-gradiometry/gg104288.Survey Name: Blackall airborne gravity gradiometery survey, 2024Datasets Acquired: Gravity gradiometry, gravity, digital terrain modelGeoscience Australia Project Number: P5024Acquisition Start Date: 11/03/2024Acquisition End Date: 06/04/2024Flight line spacing: 1000 mFlight line direction: East-West (090-270)Total distance flown: 15,705.4 line kmNominal terrain clearance: 100 mBlocks: 1Data Acquisition: Xcalibur Smart MappingProject Management: Geoscience AustraliaQuality Control: Mark Dransfield on behalf of Geoscience AustraliaDataset Ownership: Geological Survey of Queensland and Geoscience AustraliaIncluded in this release:1. Point-located DataASCII-column data in ASEG-GDF format with accompanying description and definition files.• Gravity gradiometry data including the various corrections• Gravity gradiometry data noise estimates• Vertical gravity estimate including various reduction and levelled corrections• Digital terrain model2. GridsGridded data in ERMapper (.ers) format (GDA2020/MGA zone 55):• Free-air vertical gravity gradiometry• Free-air corrected vertical gravity• Terrain and bouguer corrected vertical gravity gradiometry (densities for terrain correction: 2.0g/cm3 and 2.67 g/cm3)• Terrain and bouguer corrected vertical gravity (densities for terrain correction: 2.0g/cm3 and 2.67 g/cm3)• Conformed, terrain and bouguer corrected vertical gravity gradiometry (densities for terrain correction: 2.0g/cm3 and 2.67 g/cm3)• Conformed, terrain and bouguer vertical gravity (densities for terrain correction: 2.0g/cm3 and 2.67 g/cm3)• Digital terrain model3. Reports• Contractors Logistics Report• Quality Control Report (Mark Dransfield)

昆士兰州中部布莱克奥尔机载重力梯度仪（Airborne Gravity Gradiometer，AGG）测量飞行于2024年3月11日至4月6日实施。本项目由澳大利亚地球科学局（Geoscience Australia）受昆士兰州地质调查局委托，负责项目管理、合同管理与质量控制，数据采集工作由Xcalibur Smart Mapping承担。本记录包含点位定位数据、网格化数据与质量控制报告。
勘测区域以东经147°21′、南纬25°16′为中心，位于布莱克奥尔以南。本次作业共完成34架次生产飞行，累计获取15705.4公里测线数据，采用1000米测线间距，标称离地高度为100米。
机载重力顾问马克·德兰斯菲尔德博士（Mark Dransfield）受澳大利亚地球科学局委托开展质量控制工作，相关报告已附于本记录中。本次AGG勘测旨在补充该区域遗留的区域地面重力数据，提升区域重力异常的解译精度；此外，本AGG勘测数据将有助于深入了解盖层序列厚度与下伏基底地质特征。
本数据集由昆士兰州地质调查局发布，获取链接为：https://geoscience.data.qld.gov.au/data/gravity-gradiometry/gg104288。
## 勘测基本参数
勘测名称：2024年布莱克奥尔机载重力梯度测量
获取数据集类型：重力梯度测量、重力数据、数字地形模型
澳大利亚地球科学局项目编号：P5024
采集开始日期：2024/03/11
采集结束日期：2024/04/06
测线间距：1000米
测线方向：东西向（090-270方位）
累计飞行测线距离：15705.4公里
标称离地高度：100米
区块数量：1
数据采集方：Xcalibur Smart Mapping
项目管理方：澳大利亚地球科学局
质量控制方：马克·德兰斯菲尔德博士（受澳大利亚地球科学局委托）
数据集权属：昆士兰州地质调查局与澳大利亚地球科学局
## 本次发布包含内容
1. 点位定位数据
采用ASEG-GDF格式的ASCII列数据，附带配套说明与定义文件：
• 包含各类校正项的重力梯度测量数据
• 重力梯度测量数据噪声评估结果
• 包含各类归算与平差校正项的垂直重力估算结果
• 数字地形模型
2. 网格化数据
采用ERMapper（.ers）格式的网格化数据（坐标系为GDA2020/MGA第55带）：
• 自由空气垂直重力梯度
• 自由空气校正后垂直重力
• 经地形与布格校正的垂直重力梯度（地形校正密度分别为2.0g/cm³与2.67g/cm³）
• 经地形与布格校正的垂直重力（地形校正密度分别为2.0g/cm³与2.67g/cm³）
• 经整合、地形与布格校正的垂直重力梯度（地形校正密度分别为2.0g/cm³与2.67g/cm³）
• 经整合、地形与布格校正的垂直重力（地形校正密度分别为2.0g/cm³与2.67g/cm³）
• 数字地形模型
3. 报告
• 承包商后勤报告
• 质量控制报告（马克·德兰斯菲尔德编制）