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Web mining-based remote sensing product search limited item semantic extension method

A technology of semantic expansion and remote sensing products, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of weakening of features in the field of remote sensing products, inconvenient retrieval by ordinary users, and inability to meet retrieval precision and recall Ratio requirements and other issues to achieve the effect of improving accuracy

Active Publication Date: 2016-07-20
TWENTY FIRST CENTURY AEROSPACE TECH CO LTD
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Problems solved by technology

However, limited by the principle of ontology construction, the query expansion through ontology is extremely professional, and it is not convenient for ordinary users to search. However, with the publicization of remote sensing products and services, the domain characteristics of remote sensing products are gradually weakening, and the heterogeneity of remote sensing products and services The nature and dynamic characteristics are becoming more and more obvious, and user semantic extension solely relying on the ontology idea cannot meet the requirements of retrieval precision and recall

Method used

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  • Web mining-based remote sensing product search limited item semantic extension method
  • Web mining-based remote sensing product search limited item semantic extension method

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] The present invention proposes a semantic extension method for remote sensing product retrieval limited items based on network mining, the steps are as follows:

[0036] S1. Input the limited items of the query content into the search engine, extract the network search results, extract the content introduction of each record to form a sentence, and sequentially form an excerpt chapter.

[0037] At the same time, extract the public time of each record, extract the document creation time if there is no public time, define the time specification format, convert the public time or document creation time according to the time specification format as the reference reference time, and record the reference reference time In its corresponding content introduction segment; if a record has no publication time and document creation time, o...

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Abstract

The invention discloses a web mining-based remote sensing product search limited item semantic extension method. The method mainly comprises the following steps: extracting brief introduction content and time information on the basis of a network search result so as to form an extract chapter; extracting time words and space words in the chapter, and labeling basic time expressions corresponding to the time words and the space words; normalizing the labelled basic time expressions; counting the normalized basic time expressions and the space words, ad taking the time and space words which appear at high frequency as extension results. In allusion to the problem that the time and space information input by users has fuzziness, reference performance and dynamics in remote sensing product search, the web mining-based remote sensing product search limited item semantic extension method is disclosed, so that integrated time and space information is positioned, the semantic extension carried out on user input information is realized, the user demands can be correctly understood, and the correctness and timeliness of the search are improved.

Description

technical field [0001] The invention belongs to the field of remote sensing data processing and information extraction, and relates to a semantic extension technology for remote sensing product retrieval limited items based on network mining technology. Background technique [0002] Semantic expansion of restricted items in remote sensing products refers to the semantic expansion of the time and place information contained in the restricted items in the retrieved content when retrieving remote sensing products. Among them, the limited item refers to the time and space limited information contained in the search content of the remote sensing product that the user queries, and is divided into explicit and implicit space-time information. The explicit space-time information refers to the time and space directly displayed in the search content. Spatial information, while implicit spatio-temporal information means that the search content does not directly display the time and spa...

Claims

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Application Information

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IPC IPC(8): G06F17/30
CPCG06F16/3338G06F16/3344G06F16/338
Inventor 何建军李玉堂陈婷关盛勇王西亚高宇武文斌高松峰
Owner TWENTY FIRST CENTURY AEROSPACE TECH CO LTD
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