Oasis - No nearby connection has been found for point inside LA

[CodeBear801]

This bug related with: #238

When try to find nearby charge station for 800,000 meters, I found warning in logs say that some point in LA didn't has near by charge stations, which is impossible.

[CodeBear801]

Debug strategy:

• For each charge station point, log all the s2 cells it covered
• For each charge station point, when apply s2 query, log all s2 cells it want to retrieve data from
• visualize result

[CodeBear801]

Issue found: Query's level is one level up compare with pre-processing:

The small cell in middle is the max level generated in preprocessing, the large cell is two of query cell's result near given location, which is one level up.

Debug information

38.94177,-121.10558

point = {ID:26376303 Location:{Lat:38.94177 Lon:-121.10558}} {809b106b873,809b106b874,809b106b87,809b106b84,809b106b9,809b106bc,809b106b,809b106c,809b107,809b104,809b11,}

query_result.txt

+++ p.Location = {Lat:38.94177 Lon:-121.10558}, 800000, nearbyIDs = 0

[CodeBear801]

Some improvement suggestions:

• May be consider to record data into bigger cells, to level = 6, then 'S2' will merge small cells in the middle