I have 2 tables (given sample records):
1> tbl_travel
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| id | from_loc| from_lat | from_lon |to_loc | to_lat | to_lon |
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| TRV1 | Kolkata |34.44444 | 84.3434 | Dumka |34.44444 | 84.3434|
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| TRV2 | Vizag |30.44222 | 83.3412 | Pune |35.44345 | 85.3411|
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| TRV3 | Challa |34.5672 | 82.2345 | Pune |35.44345 | 85.3411|
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1> tbl_agent_route
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|id|agent_id|from_route|from_lat| from_lon |to_route |to_lat|to_lon|
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|1 |2 | Rachi |34.44444 | 84.3434 | Durgapur|34.44444 | 84.3434|
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|2 |2 | Srirampuram |30.44222 | 83.3412 | mumbai |35.44345 | 85.3411|
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|3 |1 | Dariyapur |34.5672 | 82.2345 | Rajgir |35.44345 | 85.3411|
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现在我需要旅行代理商路线（from_route或to_route）半径100公里范围内的所有旅行记录，其agent_id为2。
感谢。