Changes between Version 4 and Version 5 of IppFilenameStructure

Timestamp:

Nov 13, 2009, 3:19:41 PM (17 years ago)

Author:

dravg.uk.edinburgh

Comment:

--

IppFilenameStructure

@@ -38 +38 @@
    * `ch.mk`
    * `ch`
-  * If '''wrp''' then it's a warm (i.e. mapped to sky coordinates)
+  * If '''wrp''' then it's a warp (i.e. mapped to sky coordinates)
    * `169841` = ?
    * `skycell` = invariant.  Just lets you know the next two numbers are skycell references
@@ -49 +49 @@
 
 == Skycells ==
+
+Skycells are devised by tessellation of the 4pi sky.  Equal-area rectangles are centred on the tessellation points such that no space is left covered and the borders of all rectangles overlap other rectangles.
+
+Each skycell is further divided into subcells on a grid which (in future at least) overlap by a few arcsecs with neighbouring subcells such that no part of the sky is stuck only on a boundary.
+