I have a very large shapefile of road-network containing only coordinates and the type of elements (i.e. line) (JFI, you will find the shapefilehere. Since this file is hard to process even for my computer with 16GB and I am not interested in all the elements included in the shape file, is it possible load only the roads bounded in a circled/boxed area centered at the coordinate lat0, lon0 with a radius/side of 100km? Thus, I will reduce the size of the shape loaded vector struct array. Thanks.