A local gravity anomaly extraction method based on satellite altimetry gravity data

Abstract

The invention discloses a local gravity anomaly extraction method based on satellite height measurement gravity data, which comprises the following basic steps of: processing satellite altimetry gravity data by using a sobel operator to obtain each gravity anomaly region; extracting a minimum enclosing rectangle of each gravity anomaly region according to the boundary line of each gravity anomalyregion; performing coordinate system rotation on the minimum enclosing rectangle of each gravity anomaly region to obtain a transformation rectangle, and obtaining a gravity anomaly value in each transformation rectangle region by utilizing an improved curved surface fitting method; performing interpolation processing on the gravity abnormal value of each transformation rectangle by utilizing a network function to obtain a regional abnormal gravity value of each gravity abnormal region; and finally obtaining a local gravity abnormal value of each gravity abnormal region. The method is scientific and reasonable and has high operability and practicability, and the satellite height measurement gravity data are processed through the network function interpolation method to obtain local gravityanomaly information.

Description

technical field [0001] The invention relates to a network function interpolation method, in particular to a local gravity anomaly extraction method based on satellite altimetry gravity data. Background technique [0002] The generally obtained gravity data is the Bouguer gravity anomaly data, which is the simplest and most widely studied gravity anomaly data in contemporary gravity research. The Bouguer gravity anomaly is composed of regional gravity anomaly and local gravity anomaly. Among them, gravity anomalies caused by geological factors with a large distribution and deep influence (such as regional geological structures) are called regional gravity anomalies, and small-scale gravity anomalies caused by geological factors (such as minerals, oil and gas) called a local gravity anomaly. It can be seen that the extraction of local gravity anomalies is not only an important research content of resource exploration, but also helpful to the study of geological structures. ...

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Problems solved by technology

The experimental principles of these two methods are relatively simple, but there will be more limitations in the experimental process.

For example, there will be missing edges or low edge fitting accuracy. It can be seen that it is difficult to effectively extract the edge information of local gravity anomalies by traditional extraction methods, and the network function interpolation makes good use of edge data for data interpolation. , providing a new research idea for the extraction of local gravity anomalies

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