Changeset 9713 for trunk/doc/modules/ModulesSDRS.tex
- Timestamp:
- Oct 20, 2006, 6:27:38 PM (20 years ago)
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trunk/doc/modules/ModulesSDRS.tex (modified) (4 diffs)
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trunk/doc/modules/ModulesSDRS.tex
r9689 r9713 1 %%% $Id: ModulesSDRS.tex,v 1.7 8 2006-10-21 00:58:33price Exp $1 %%% $Id: ModulesSDRS.tex,v 1.79 2006-10-21 04:27:38 price Exp $ 2 2 \documentclass[panstarrs,spec]{panstarrs} 3 3 … … 87 87 88 88 89 \subs ubsection{Configuration information}89 \subsection{Configuration information} 90 90 91 91 This structure stores the configuration information: the site, camera … … 134 134 \end{prototype} 135 135 pmConfigRead loads the site configuration (the file name is specified 136 by "-site SITE _FILE" on the command-line, the PS_SITE environment137 variable, or it is \code{$HOME/.ipprc}). The configuration search %$ 138 path is set. The camera configuration is loaded if it is specified on 139 the command line ("-camera CAMERA_FILE"). Recipes specified on the 140 command line ("-recipe RECIPE_NAME RECIPE_SOURCE") are also loaded. 141 These command-line arguments are removed from from the command-line, 142 tosimplify parsing. The psLib log, trace and time setups are also136 by "-site SITE\_FILE" on the command-line, the PS\_SITE environment variable, or 137 it is \code{$HOME/.ipprc}). The configuration search %$ path is 138 set. The camera configuration is loaded if it is specified on the 139 command line ("-camera CAMERA\_FILE"). Recipes specified on the command 140 line ("-recipe RECIPE\_NAME RECIPE\_SOURCE") are also loaded. These 141 command-line arguments are removed from from the command-line, to 142 simplify parsing. The psLib log, trace and time setups are also 143 143 performed if specified in the site configuration. 144 144 … … 617 617 %\input{CameraGeometry.tex} 618 618 619 \section{Photometry} 620 621 \tbd{This section is to be deferred, and for now consists only of 622 place holders, with no functional items.} 623 624 Photometric observations are performed in an instrumental photometric 625 system, and must be related to other photometric systems. We 626 require a data structure which defines a photometric system, as well 627 as a structure to define the transformation between photometric 628 systems. 629 630 The photometric system is defined by the psPhotSystem structure. 631 A photometric system is identified by a human-readable \code{name} 632 (ie, SDSS.g, Landolt92.B, GPC1.OTA32.r). Each photometric system is 633 given a unique identifier \code{ID}. Observations taken with a 634 specific camera, detector, and filter represent their own photometric 635 system, and it may be necessary to perform transformations between 636 these systems. Photometric systems associated with observations from 637 a specific camera/detector/filter combination can be associated with 638 those components. 639 \begin{datatype} 640 typedef struct { 641 const int ID; ///< ID number for this photometric system 642 const char *name; ///< Name of photometric system 643 const char *camera; ///< Camera for photometric system 644 const char *filter; ///< Filter used for photometric system 645 const char *detector; ///< Detector used for photometric system 646 } psPhotSystem; 647 \end{datatype} 648 649 The following structure defines the transformation between two 650 photometric systems. 651 \begin{datatype} 652 typedef struct { 653 psPhotSystem src; ///< Source photometric system 654 psPhotSystem dst; ///< Destination photometric system 655 psPhotSystem pP, pM; ///< Primary color reference 656 psPhotSystem sP, sM; ///< Secondary color reference 657 float pA, sA; ///< Color offset for references 658 psPolynomial3D transform; ///< Transformation from source to destination 659 } psPhotTransform; 660 \end{datatype} 661 662 The transformation between two photometric systems may depend on the 663 airmass of the observation and on the colors of the object of 664 interest. For a specific observation, such a transformations can be 665 defined as a polynomial function of the color of the star and the 666 airmass of the observations. If sufficient data exists, the 667 transformation between the photometric systems may include more than 668 one color, constraining the curvature of the stellar spectral energy 669 distributions. This latter term may be significant for stars which 670 are highly reddened, for example. Derived photometric quantities may 671 have been corrected for airmass variations, in which case only color 672 terms may be measurable. The structure defines the transformation 673 between a source photometric system (\code{src}) and a target 674 photometric system (\code{dst}). The photometric system of a primary 675 color is defined by \code{pP, pM} such that the color is constructed 676 as $pP - pM$. A secondary color is defined by \code{sP, sM}. For 677 both, a reference color is specified (\code{pA, sA}): the polynomial 678 transformation terms refer to colors in the form $pP - pM - pA$. The 679 transformation is specified as a 3D polynomial. For a star of 680 magnitude $M_{\rm src}$ in the source photometric system, with 681 additional magnitude information in the other systems $M_{\rm pP}$, 682 $M_{\rm pM}$, $M_{\rm sP}$, $M_{\rm sM}$, observed at an airmass of 683 $z$, the magnitude of the star in the target system $M_{\rm dst}$ is 684 given by: $M_{\rm dst} = M_{\rm src} + transform(z, M_{\rm pP} - 685 M_{\rm pM} - pA, M_{\rm sP} - M_{\rm sM} - sA)$. 619 620 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 686 621 687 622 \section{Image Detrending}
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