Re: [Talk-GB] Georeferencing / zeroing imagery

On 2019-09-14 17:14, SK53 wrote: > Hi Edward, > > In general the GPS rule is still the best way of doing it, we used to have > access to Strava heatmap which was very good, but no longer. > > Other viable alternatives are: > > * OS OpenData road centrelines. Of course if you use a crude

Re: [Talk-GB] Georeferencing / zeroing imagery

Take my answers with a grain of salt. I'm no expert, but these are from my experience and current understanding. On Sat, Sep 14, 2019 at 3:58 PM Edward Bainton wrote: > A few questions: > - Over how wide an area does an offset obtained that way hold good? > This varies, areas with large

Re: [Talk-GB] Georeferencing / zeroing imagery

Hi Edward, In general the GPS rule is still the best way of doing it, we used to have access to Strava heatmap which was very good, but no longer. Other viable alternatives are: - OS OpenData road centrelines. Of course if you use a crude OSGB->WGS84 based on OSGB36 this may be upto 5 m

[Talk-GB] Georeferencing / zeroing imagery

Hi folks Another query from me that I imagine has been done to death elsewhere (so apologies), but I haven't found it on the wiki. The usual disclaimer that I'm not well up on the technical side of the map. I've read the wiki on Using Imagery