[R-sig-Geo] Breaking a polygon at a line

2018-01-27 Thread Orme, David
Hi, I’m trying to cut a polygon open into a linestring using a line string as a blade (for want of a better description). The specific use case is that I want to convert a polygon boundary into a GPX route and want to control the starting point. Using ‘sf’, an simple example of the inputs and

Re: [R-sig-Geo] accessing spatial imagery via rgdal's web map tile service driver

2018-01-27 Thread Roger Bivand
On Fri, 26 Jan 2018, Fischbach, Anthony wrote: I see that WMS ("OGC Web Map Service") and WMTS ("OGC Web Mab Tile Service") are supported within my rgdal installation , however, it is unclear how to call for WMTS imagery. Please advise on how to access geo-referenced imagery through a web map