This Fortran facility provides a means to find local extrema of a map in HEALPix format. It also serves to illustrate the use of the following parts of the HEALPix toolkit: fast neighbour and extrema finding in the nested scheme, in-place conversion between RING and NESTED pixel schemes
Location in HEALPix directory tree: src/f90/hotspot/HotSpots.f90
hotspot reads a healpix map in FITS format and generates the following outputs: 1) a HEALPix map in FITS format which is zero everywhere, except at pixels which contain local extrema. These pixels have the same values as in the input map. 2) an ASCII file which lists the pixel numbers and values of maxima, and 3) an ASCII file which lists the pixel numbers and values of minima.
The following datasets are involved in the hotspot processing.
This section lists those routines and facilities (including those external to the Healpix distribution) which can assist in the utilisation of hotspot.
EXAMPLE # 1:
hotspot runs in interactive mode.
EXAMPLE # 2:
When `filename' is present, hotspot enters the non-interactive mode and parses its inputs from the file `filename'. This has the following structure: the first entry is a qualifier which announces to the parser which input immediately follows. If this input is omitted in the input file, the parser assumes the default value shown below. If the equality sign is omitted, then the parser ignores the entry. In this way comments may also be included in the file. In this example, the file contains the following qualifiers:
This section describes error messages generated by hotspot
Eric Hivon 2010-06-18