5.5.10 Mapping

Several methods are provided to construct a map, taking into account the relative positions of the bolometers in the instrument. The slowMap method computes exact positions and loops over the pixels of the resulting map to calculate the contributions to the flux at a given position from all bolometers. This is a very slow method.

The fastMap method loops over the signal series in each bolometer, and dumps fluxes at the nearest pixel on the final map. Then the maps produces from each bolometer are coadded. This method makes use of operations on arrays, and is thus very fast.

  read('lissajou')
  op()                 # open an XWindow device
  data.fastMap()       # reconstruct a map with the fast method