基于直升机航空重力同步地形的布格改正处理

doi:10.11720/wtyht.2023.1289

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Abstract

Large-scale mining activities have been continued in key exploration areas. Consequently, the mined-out areas, waste dumps, and tailings ponds of mines are constantly deforming. As a result, the digital terrain method fails to make the terrain data closely match the airborne gravimetric data, leading to serious correction errors in airborne gravity terrain correction and stone-slab correction. This study calculated the difference between the GNSS geodetic height and the radio terrain clearance altitude of the helicopter gravity and magnetic survey system and then converted the GNSS geodetic height into normal height. Then, the synchronous surveyed terrains were obtained through leveling and fine-scale processing. Moreover, the surveyed terrain data, together with various collected terrain data, were compared with the ICESat-2/ATL08 spaceborne laser elevation. The results show that the surveyed terrains Wxd100 and Wxd400 had elevation precision of 5.33 m and 8.93 m, respectively. After airborne Bouguer gravity correction was conducted using the surveyed terrains, the data quality of the mining area and several typical survey lines was greatly improved.

Key words： airborne gravimetry synchronization surveyed terrain Bouguer gravity mine

Received: 10 June 2022 Published: 27 April 2023

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	Jin-Hong QU
	Zuo-Xi JIANG
	Xi-Hua ZHOU
	Ming WANG
	Feng LUO

Cite this article:

Jin-Hong QU,Zuo-Xi JIANG,Xi-Hua ZHOU, et al. Airborne Bouguer gravity based on synchronous terrains surveyed using helicopter airborne gravimetry[J]. Geophysical and Geochemical Exploration, 2023, 47(2): 447-457.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1289 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I2/447

Basic parameters of the global public version of 30 m resolution DEM

Comparison of DEM data collected on survey line L1710 with actual topography

Relationship between elevations

Actual surveyed terrain processing
a—initially obtain the actual surveyed terrain; b—actual surveyed terrain is levelled by the tie-line; c—actual surveyed terrain is levelled by microlevelling process; d—actual surveyed terrain after stripping off tall buildings

Extracted striping patterns

Extracted striping patterns by Naudy non-linear filter

Multi-source DEM data and the actual surveyed terrain after stitching SRTM1
a— 1:50000DEM; b—ASTER; c—SRTM1; d—AW3D30; e—SRTM3; f—actual surveyed terrain was stitched with SRTM1

Static measurement standard deviation (STD)

Internal accuracy statistics for repeated lines of elevation

Statistics of survey network intersections of actual surveyed terrain

Map of ATL08 Laser data on the track in the experimental area

Multi-source DEM data statistics based on ICESat-2/ATL08

Multi-source DEM data partition statistics based on ICESat-2/ATL08

Schematic diagram of airborne gravity terrain correction

序号	高程地形	分辨率/m	外符合总精度/ (10^-5m· $s - 2$ )	采集时间
A1	1:5万	25	1.159	早于2000
A2	ASTER	30	1.305	1999~2008
A3	SRTM1	30	1.098	2000.2
A4	AW3D30	30	1.063	2006~2011
A5	SRTM3	90	1.097	2000.2
B1	1:5万_Wxd100	25	1.056	测区同步
B2	ASTER_Wxd100	30	1.090	测区同步
B3	SRTM1_Wxd100	30	1.054	测区同步
B4	AW3D30_Wxd100	30	1.057	测区同步
B5	SRTM3_Wxd100	90	1.056	测区同步
B6	SRTM1_Wxd400	30/80	1.059	测区同步

The total accuracy of external coincidence for airborne Bouguer gravity by different DEM data

	B1~A1	B2~A2	B3~A3	B4~A4	B5~A5	A5~A3	B6~B3
Min/(10^-5m· $s - 2$ )	-5.281	-2.329	-3.800	-1.356	-3.746	-0.122	-0.562
Max/(10^-5m· $s - 2$ )	4.887	2.646	3.693	1.194	3.728	0.019	0.524
ME/(10^-5m· $s - 2$ )	-0.206	-0.608	-0.201	0.063	-0.177	-0.048	-0.061
STD/(10^-5m· $s - 2$ )	0.589	0.581	0.420	0.242	0.412	0.007	0.126

Statistics of Bouguer gravity difference between two DEM data

Difference map of Bouguer gravity anomaly difference between two DEM data
a—B1~A1; b—B2~A2; c— B3~A3;d—B4~A4;e—A5~A3; f— B6~B3

The external coincidence accuracy of airborne Bouguer gravity under different DEM data for typical lines(10^-5m·

s - 2

)

Comparison of airborne Bouguer gravity anomaly on L2270

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