Bearings and reprojections

stplanr 0.1.4

NEW FEATURES

• New function reproject() is a simple wrapper around spTransform() that uses
  crs_select_aeq() to convert a spatial object in geographic (lat/lon) coordinates
  into on with projected coordinates, with units of 1 m. This is useful for various
  spatial operations, such as finding the length and area of an object.
• Implement gprojected(), a function for performing GIS operations on a temporary, projected, version
  of spatial objects.
• Addition of line_bearing() to return the bearing of lines based on start and end points.
• Addition of angle_diff() for finding the angular difference between lines: are they roughly parallel or perpendicular?

BUG FIXES

• line2df() now works on lines with multiple vertices and is faster.
• Fixes in the examples used to illustrate how od_dist() works.

stplanr 0.1.3

NEW FEATURES

• Update to OSRM functions to support API v5.
• New parameter byvars in the overline() function, to allow disaggregation of results by a grouping variable (see example(overline)).
• Faster implementation of od2line(): od2line2(). Plan is to replace the original if no issues are found with new implementation.
• New function od2odf() which converts OD data into a dataframe of origins and destinations (feeds od2line2() but also useful as self-standing function).
• New argument new_proj in buff_geo() allows the results to be exported to any coordinate reference system (CRS).
• New function gprojected() generalises concept of buff_geo(), building on crs_select_aeq() to allow any GIS query to be conducted on a temporary projected version of spatial objects with geographical CRSs.
• New function od_dist() can quickly calculate Euclidean distances of OD pairs without converting to spatial objects.

BUG FIXES

• Bug fix in onewayid() so it captures all lines.
• Various improvements to documentation and code.