<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!--Converted with LaTeX2HTML 98.1p1 release (March 2nd, 1998) originally by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> <HTML> <HEAD> <TITLE>Mosaicing of Frames</TITLE> <META NAME="description" CONTENT="Mosaicing of Frames"> <META NAME="keywords" CONTENT="vol2"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <LINK REL="STYLESHEET" HREF="vol2.css"> <LINK REL="next" HREF="node62.html"> <LINK REL="previous" HREF="node55.html"> <LINK REL="up" HREF="node31.html"> <LINK REL="next" HREF="node62.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html2189" HREF="node62.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html2186" HREF="node31.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html2180" HREF="node60.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html2188" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="icons.gif/contents_motif.gif"></A> <BR> <B> Next:</B> <A NAME="tex2html2190" HREF="node62.html">Miscellaneous</A> <B> Up:</B> <A NAME="tex2html2187" HREF="node31.html">CCD Reductions</A> <B> Previous:</B> <A NAME="tex2html2181" HREF="node60.html">Bad Pixel Correction</A> <BR> <BR> <!--End of Navigation Panel--> <H1><A NAME="SECTION006110000000000000000"> </A> <A NAME="mosaicing-of-frames"> </A> <BR> Mosaicing of Frames </H1> In particular in the IR range of the spectrum but also in the optical the user may want to combine several reduced science frames into a mosaic. To support this, the CCDRED context contains five mosaicing commands. <P> In order to align or match a number of images the user first has to run the command <TT>CREATE/MOSAIC</TT>. This command creates a master frame containing all input frames to be aligned and intensity matched as sub rasters. The order in which the sub rasters are put in the mosaic image is determined by a number of keywords all starting with <TT>`MO_'</TT>. <I>E.g.</I> the keyword <TT>MO_CORN</TT> determines the origin of the mosaic. Apart from the mosaic image, <TT>CREATE/MOSAIC</TT> also creates a MIDAS table containing all relevant information about the subrasters in the mosaic image and the ways it was created. <P> Using the mosaic frame and the database table, one can now do the alignment or alignment and matching of the sub raster. The alignment can be done by the command <TT>ALIGN/MOSAIC</TT>, the matching by two commands: <TT>MATCH/MOSAIC</TT> and <TT>FIT/MOSAIC</TT>. To be successful these commands need additional information were the images have to be glued together. The commands <TT>ALIGN/MOSAIC</TT> and <TT>MATCH/MOSAIC</TT> accept that information in three different formats: a fixed shift, a table with the x and y shifts for each subraster, or a table of common objects. The command <TT>FIT/MOSAIC</TT> only needs the database table that should contain the shifts per subraster. <P> The command <TT>SHIFT/MOSAIC</TT> is created in order to support the selection of common objects in adjacent subrasters. This command can be used to create a MIDAS table containing these objects and that can be used as input for the commands <TT>ALIGN/MOSAIC</TT> and <TT>MATCH/MOSAIC</TT>. <P> The keyword setting for the mosaicing can be inspected by the command <TT>SHOW/CCD MO</TT>. Changes can be done by the <TT>SET/CCD</TT> command. Below follows an overview of the mosaicing keywords and their default settings. The help files of the five commands give the full details. <P> <BR> <DIV ALIGN="CENTER"><A NAME="2067"> </A> <TABLE> <CAPTION><STRONG>Table 3.10:</STRONG> CCD keywords for mosaicing</CAPTION> <TR><TD> <DIV ALIGN="CENTER"> <TABLE CELLPADDING=3 BORDER="1" ALIGN="CENTER"> <TR><TH ALIGN="LEFT"><B>Keyword </B></TH> <TH ALIGN="LEFT"><B>Options </B></TH> <TH ALIGN="LEFT"><B>Default </B></TH> <TH ALIGN="LEFT"><B>Description </B></TH> </TR> <TR><TD ALIGN="LEFT"><TT>MO_SEC </TT></TD> <TD ALIGN="LEFT">coord.</TD> <TD ALIGN="LEFT">[<,<:>,>]</TD> <TD ALIGN="LEFT">section for statistics</TD> </TR> <TR><TD ALIGN="LEFT"><TT>MO_SUBT </TT></TD> <TD ALIGN="LEFT">yes|no</TD> <TD ALIGN="LEFT">no</TD> <TD ALIGN="LEFT">subtraction option?</TD> </TR> <TR><TD ALIGN="LEFT"><TT>MO_CORN </TT></TD> <TD ALIGN="LEFT">ll|lr|ul|ur</TD> <TD ALIGN="LEFT">ll</TD> <TD ALIGN="LEFT">type of function to fit</TD> </TR> <TR><TD ALIGN="LEFT"><TT>MO_DIREC </TT></TD> <TD ALIGN="LEFT">row|column</TD> <TD ALIGN="LEFT">row</TD> <TD ALIGN="LEFT">add subraster row/column wise</TD> </TR> <TR><TD ALIGN="LEFT"><TT>MO_RAST </TT></TD> <TD ALIGN="LEFT">yes|no</TD> <TD ALIGN="LEFT">no</TD> <TD ALIGN="LEFT">add in raster pattern</TD> </TR> <TR><TD ALIGN="LEFT"><TT>MO_OVER </TT></TD> <TD ALIGN="LEFT">integer</TD> <TD ALIGN="LEFT">1,1</TD> <TD ALIGN="LEFT">space between adj. frames</TD> </TR> <TR><TD ALIGN="LEFT"><TT>MO_INTER </TT></TD> <TD ALIGN="LEFT">interpolant</TD> <TD ALIGN="LEFT">lin</TD> <TD ALIGN="LEFT">interpolation method</TD> </TR> <TR><TD ALIGN="LEFT"><TT>MO_MNPX </TT></TD> <TD ALIGN="LEFT">integer</TD> <TD ALIGN="LEFT">0</TD> <TD ALIGN="LEFT">minimal number of pixels</TD> </TR> <TR><TD ALIGN="LEFT"><TT>MO_TRIM </TT></TD> <TD ALIGN="LEFT">integer</TD> <TD ALIGN="LEFT">1,1,1,1</TD> <TD ALIGN="LEFT">trim columns and rows</TD> </TR> <TR><TD ALIGN="LEFT"><TT>MO_NUL </TT></TD> <TD ALIGN="LEFT">real</TD> <TD ALIGN="LEFT"><TT> NULL(2)</TT></TD> <TD ALIGN="LEFT">value for rejections</TD> </TR> </TABLE></DIV> <A NAME="ccd:mosaic-keywords"> </A> </TD></TR> </TABLE> </DIV> <BR> <P> <HR> <!--Navigation Panel--> <A NAME="tex2html2189" HREF="node62.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html2186" HREF="node31.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html2180" HREF="node60.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html2188" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="icons.gif/contents_motif.gif"></A> <BR> <B> Next:</B> <A NAME="tex2html2190" HREF="node62.html">Miscellaneous</A> <B> Up:</B> <A NAME="tex2html2187" HREF="node31.html">CCD Reductions</A> <B> Previous:</B> <A NAME="tex2html2181" HREF="node60.html">Bad Pixel Correction</A> <!--End of Navigation Panel--> <ADDRESS> <I>Petra Nass</I> <BR><I>1999-06-15</I> </ADDRESS> </BODY> </HTML>
