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US 11,960,050 B1Granted
Fusion method of satellite-based and ground-based lightning data
AssigneeNanjing Joint Institute for Atmospheric Sciences
InventorsYan Liu, Jie Zhu, Zheng Li, Meirong Yang, Hongbin Wang, Duanyang Liu, Fanchao Lv, Sulin Jiang, Fengjiao Chen
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Abstract
A fusion method of satellite-based and ground-based lightning data includes S1, selecting valid data in the satellite-based and ground-based lightning data; S2, determining a time threshold for fusing the satellite-based and ground-based lightning data; S3, determining a spatial threshold for fusing the satellite-based lightning data and the ground-based lightning data; and S4, constructing a data fusion scheme to obtain a fused all lightning data set.
Claims6
A fusion method of satellite-based and ground-based lightning data,
- comprising following steps:
- step S1, selecting valid data in the satellite-based and ground-based lightning data:
- selecting group products of satellite-based lightning, and data of cloud-to-ground lightning return strokes as well as cloud flash pulses received by a ground-based VLF/LF three-dimensional lightning locator as valid data for fusing, wherein the data of the cloud-to-ground lightning return strokes and the cloud flash pulses received by the ground-based VLF/LF three-dimensional lightning locator comprise occurrence times, positions and lightning current intensities;
- step S2, determining a time threshold for fusing the satellite-based and ground-based lightning data:
- determining a difference of longitudes and latitudes to 0.2°, within a range of 0.02 s to 2 s, changing time window values with a time resolution of the satellite-based lightning data as a progressive speed, and calculating a matching degree MP between the satellite-based lightning data and the ground-based lightning data under specified time and space windows, and taking a change inflection point of the matching degree MP as the time threshold, wherein the matching degree is obtained by a following formula:
- M
-
- P
- =
- G
- S
- G
- ×
- 100
-
- %
- ,
- wherein the matching degree MP represents a ratio of a number of group products matched with at least one of the cloud-to-ground lightning return strokes or cloud flash pulses to a total number of the group products detected by the satellite-based lightning under the specified time and space window, and GS is the number of the group products matched with at least one of the cloud-to-ground lightning return strokes or the cloud flash pulses;
- G is the total number of the group products detected by the satellite-based lightning;
- step S3, determining a spatial threshold for fusing the satellite-based and ground-based lightning data:
- selecting samples from an isolated thunderstorm system, and calculating centroid distances between lightning clusters detected by satellite-based and ground-based lightning detection systems in an evolution process of same the thunderstorm system, and taking a distance corresponding to an 80th percentile as the spatial threshold;
- and
- step S4, based on the time threshold and the spatial threshold determined in the step S2 and step S3 respectively, considering ground-based lightning data and satellite-based lightning data within the time threshold and the spatial threshold to be overlapped, eliminating the satellite-based lightning data overlapped, and merging remaining satellite-based lightning data with the ground-based lightning data to obtain a fused all lightning data set;
- wherein the method further comprises:
- applying the fused all lightning data set to provide lightning monitoring and early warning, severe convective weather analysis, lightning disaster investigation and identification, and/or lightning protection design.
22 more elements
A fusion method of satellite-based and ground-based lightning data, comprising following steps:
- step S1, selecting valid data in the satellite-based and ground-based lightning data:
- selecting group products of satellite-based lightning, and data of cloud-to-ground lightning return strokes as well as cloud flash pulses received by a ground-based VLF/LF three-dimensional lightning locator as valid data for fusing, wherein the data of the cloud-to-ground lightning return strokes and the cloud flash pulses received by the ground-based VLF/LF three-dimensional lightning locator comprise occurrence times, positions and lightning current intensities;
- step S2, determining a time threshold for fusing the satellite-based and ground-based lightning data:
- determining a difference of longitudes and latitudes to 0.2°, within a range of 0.02 s to 2 s, changing time window values with a time resolution of the satellite-based lightning data as a progressive speed, and calculating a matching degree MP between the satellite-based lightning data and the ground-based lightning data under specified time and space windows, and taking a change inflection point of the matching degree MP as the time threshold, wherein the matching degree is obtained by a following formula:
- M
-
- P
- =
- G
- S
- G
- ×
- 1
-
- 0
-
- 0
-
- %
- ,
- wherein the matching degree MP represents a ratio of a number of group products matched with at least one of the cloud-to-ground lightning return strokes or cloud flash pulses to a total number of the group products detected by the satellite-based lightning under the specified time and space window, and GS is the number of the group products matched with at least one of the cloud-to-ground lightning return strokes or the cloud flash pulses;
- G is the total number of the group products detected by the satellite-based lightning;
- step S3, determining a spatial threshold for fusing the satellite-based and ground-based lightning data:
- selecting samples from an isolated thunderstorm system, and calculating centroid distances between lightning clusters detected by satellite-based and ground-based lightning detection systems in an evolution process of same the thunderstorm system, and taking a distance corresponding to an 80th percentile as the spatial threshold;
- step S4, based on the time threshold and the spatial threshold determined in the step S2 and step S3 respectively, considering ground-based lightning data and satellite-based lightning data within the time threshold and the spatial threshold to be overlapped, eliminating the satellite-based lightning data overlapped, and merging remaining satellite-based lightning data with the ground-based lightning data to obtain a fused all lightning data set;
- and
- step S5, applying the fused all lightning data set to provide lightning protection and disaster reduction business services.
24 more elements
Dependencies are inferred from the claim text.