sqlite, index for geographical coordinates?

Question

I have a SQLite database that contains geographical data. My table is defined like this:

     CREATE TABLE GEO_OBJECTS (ID VARCHAR(30) PRIMARY KEY     NOT NU         


        

Answer 1

A normal index might help for some one-dimensional interval queries, but in two or more dimensions, you need an index designed for such queries, such as an R-tree.

SQLite does have an R-tree module, but it might not have been compiled into your DB driver.

You might consider SpatiaLite, which is derived from SQLite and has many useful functions (such as computing the great circle distance).