Index: /trunk/Ohana/src/libdvo/doc/dvo-images.txt
===================================================================
--- /trunk/Ohana/src/libdvo/doc/dvo-images.txt	(revision 15240)
+++ /trunk/Ohana/src/libdvo/doc/dvo-images.txt	(revision 15240)
@@ -0,0 +1,7 @@
+
+the dvo image table is not extremely efficient.  it is unsorted, and
+spatial searches consist of complete scans of the table.
+
+a spatial index could consist of five cardinal points for each square
+image (4 corners and the center) or a central point and max radius.
+table would consist each would be
Index: /trunk/Ohana/src/libfits/doc/notes-compress.txt
===================================================================
--- /trunk/Ohana/src/libfits/doc/notes-compress.txt	(revision 15240)
+++ /trunk/Ohana/src/libfits/doc/notes-compress.txt	(revision 15240)
@@ -0,0 +1,32 @@
+
+I need to implement (at least) support for read of compressed images.
+It might be a good plan to upgrade the gfits API set, or at least
+identify needed work.
+
+* PCOUNT / GCOUNT : these are currently ignored.  I need to at least
+  include them in the calculation of the fits data segment size.  I
+  might need to use them in the interpretation of the table data.
+
+* implement variable-length columns in FITS table support.  
+
+* add the I/O support directly to gfits_read/write_matrix, or define
+  low-level APIs to support read/write of a compressed image?
+
+  * we should start with the low-level APIs and add in the higher
+    level ones as needed.
+
+* possible needed APIs:
+
+  - gfits_image_is_compressed (Header *header) 
+    does the specified header correspond to a compressed image?	
+    what about the PHU which implies a compressed image in the next
+    HDU?
+
+  - Matrix *gfits_uncompress_image (Header *header, Table *table)
+    convert the specified table into an image, modifying the header in
+    place
+
+  - Table *gfits_compress_image (Header *header, Matrix *matrix, Compression *options)
+    compress the given image returning the table data
+
+
Index: /trunk/Ohana/src/relastro/src/ImageOps.c
===================================================================
--- /trunk/Ohana/src/relastro/src/ImageOps.c	(revision 15239)
+++ /trunk/Ohana/src/relastro/src/ImageOps.c	(revision 15240)
@@ -174,5 +174,6 @@
 }
 
-/* XXX re-write to use image->nstars if that is possible */
+// return StarData values for detections in the specified image, converting coordinates from the
+// chip positions: X,Y -> L,M -> P,Q -> R,D
 StarData *getImageRaw (Catalog *catalog, int Ncatalog, int im, int *Nstars, int isMosaic) {
 
@@ -219,4 +220,6 @@
 }
 
+// return StarData values for averages positions in the specified image, converting coordinates from
+// the sky positions: R,D -> P,Q -> L,M -> X,Y
 StarData *getImageRef (Catalog *catalog, int Ncatalog, int im, int *Nstars, int isMosaic) {