What is the map projection of the THEMIS images?

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The THEMIS Standard Data products (EDR, RDR, ABR, & BTR) are not projected into any coordinate system. The pixels in these products maintain the time, row, and column ordering (per band) of the raw observation; this arrangement is commonly referred to as "camera coordinates". Be aware that the bands of the QUBE products are not spatially registered within a single image.

The THEMIS Special Geometry products (GEO, LOC, PBT, and DCS) are map projected, with the coordinate system details documented in the headers and/or available labels. The following guidelines are used in routine processing:

  • VIS-LOC = SINUSOIDAL, where -60 < center-latitude < +60
  • VIS-LOC = POLAR STEREOGRAPHIC, where -60 > center-latitude > +60
  • IR-GEO = SINUSOIDAL, where -70 < latitude-range < +70
  • IR-PBT & IR-DCS maintain the projection of the source IR-GEO product