#rocque

The XX - Sunset (Rocque & Waslewski Bootleg)

Another bootleg mix of The xx and their track ‘Sunset’ has dropped.  This remix is by Rocque & Waslewski and it’s not bad.  In fact it’s really good and you can download on Facebook

The Locating London's Past blog has a pair of fascinating new posts by Peter Rauxloh about the process of creating the 'new' version of Rocque's 1746 map.

Part 1: Georeferencing

However, georeferencing an historic map is generally more tricky than a modern aerial photograph, for two reasons.  First is the obvious fact that it can be challenging to identify pairs of long-lived common points on both the historic map and that produced 200 years later.  Secondly, while  the accuracy of the aerial photograph or infra-red scan is generally effected by systematic linear machine or design errors like poor camera calibration or inadequate resolution, the optical ground survey that created the old map, had  to contend with both systematic error such as poor instrument adjustment  or a  stretched  measuring chain, and a panoply of non-linear sporadic sources of gross and minor error which can occur during the survey itself and in the technique and materials used for its depiction. 

Part 2. Investigating the warp factor