; CHKFC ;--------------------------------------------------------------- ;! makes images of Clean boxes from Boxfile ;# Task Imaging ;----------------------------------------------------------------------- ;; Copyright (C) 2001-2002, 2005 ;; Associated Universities, Inc. Washington DC, USA. ;; ;; This program is free software; you can redistribute it and/or ;; modify it under the terms of the GNU General Public License as ;; published by the Free Software Foundation; either version 2 of ;; the License, or (at your option) any later version. ;; ;; This program is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; ;; You should have received a copy of the GNU General Public ;; License along with this program; if not, write to the Free ;; Software Foundation, Inc., 675 Massachusetts Ave, Cambridge, ;; MA 02139, USA. ;; ;; Correspondence concerning AIPS should be addressed as follows: ;; Internet email: aipsmail@nrao.edu. ;; Postal address: AIPS Project Office ;; National Radio Astronomy Observatory ;; 520 Edgemont Road ;; Charlottesville, VA 22903-2475 USA ;----------------------------------------------------------------------- CHKFC LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC CHKFC: Makes images showing the fields and boxes in BOXFILE OUTNAME Output Image name (name) OUTSEQ 0.0 9999.0 Output Image name (seq. #) OUTDISK 0.0 9.0 Disk drive # BOXFILE disk file to read field locs and Clean boxes COORDINA Center RA, Dec CELLSIZE 0.0 (X,Y) size of grid in asec IMSIZE 0.0 16384 field size NFIELD 0.0 4096. Number facets RASHIFT New facet RA shift (asec) DECSHIFT New facet Dec shift (asec) NBOXES 0.0 50.0 Number Clean boxes CLBOX -2.0 Clean boxes: facet #1 DOBLANK -1.0 1.0 > 0 Use blanks for unCleaned DOWEDGE -1.0 2.0 > 0 Add field number in boxes ---------------------------------------------------------------- CHKFC Type: Task Use: CHKFC reads an input BOXFILE which defines the fields for IMAGR. It makes a set of images with 1's in the Clean windows and blanks or 0's outside the Clean windows. It can take its inputs from adverbs instead of or in addition to the BOXFILE. Adverbs: OUTNAME.....The output image name (name). Standard defaults. OUTSEQ......The output image name (seq. #). 0 => highest. OUTDISK.....The output disk drive #. 0 => any. BOXFILE.....Input text file containing lines which specify the fields for the multi-field imaging. This file should then be specified as the BOXFILE for IMAGR. ' ' => take all inputs from adverbs. Leading and trailing blanks from all lines in the text file are discarded, so "column 1" below means the first non-blank column in the card. This option is used to specify field parameters for fields 1 through NFIELD which are then copied to the fields used for additional resolutions (if any). To specify a field's parameters, put the letter F or f in column 1 followed by the field number, the X and Y FLDSIZE values, the RASHIFT amd the DECSHIFT for the field (separated by blanks). Any field specified in this way overrides the corresponding parameters given in the adverbs. Thus, F 2 450 450 -25.5 6.7 specifies that field 2 is to have a FLDSIZE of 450x450 with an RASHIFT of -25.6 and a DECSHIFT of 6.7 arcsec. If this is the only F card in the file, then fields 1 and 3 through NFIELD are set by the adverb values. As an alternative, a field may also be specified with a "coordinates" card having a C or c in column one. After the C, give the field number, the X and Y FLDSIZE values and the center Right Ascension (HH MM SS.S) and Declination (signDD MM SS.S) separated by blanks. Thus C 2 450 450 11 34 45.67 -00 14 23.1 specifies that field 2 is to have a FLDSIZE of 450x450 with a center RA of 173.6902917 degrees and a center Declination of -0.23975 degrees. All 9 numbers must be given; the sign is optional for positive declinations and is given only on the degrees term. To set Clean boxes, specify one box per line, as field blc-x blc-y trc-x trc-y (5 integers) e.g. 1 200 205 220 222 1 230 232 240 241 2 100 100 130 121 ... or circular "boxes" as field -1 radius center-x center-y (5 ints) e.g. 001 -1 10 210 214 001 -1 5 235 237 .... Column 1 must contain a numeric character (part of the field number); otherwise the line is treated as a some other sort of line. Fields with no boxes specified default to the size specified by IMSIZE and FLDSIZE (see above and including FLDSIZEs read from this file). COORDINA....Center RA and Dec as HH, MM, SS.S, DD, MM, SS.S. This is used only if the BOXFILE contains F cards which define fields by a shift from the reference COORDINA. There is no default in this case. BOXFILEs that use C cards which define fields by their center coordinate do not use the value of this adverb. CELLSIZE....Pixel size for the fields in IMAGR in arc seconds. IMSIZE......Size of each field. If CELLSIZE and/or IMSIZE are zero, the data are read to find the maximum baseline and maximum W in order to estimate these parameters. NFIELD......The number of fields to map in the antenna beam. Up to 4096 are allowed. Number used will be the max of NFIELD and the max field number in BOXFILE. RASHIFT.....New RA shift of the phase center of each field from the tangent point of the uv data in asec. Map center = tangent point + shift. If X>0 shifts map center to east. NOTE: RASHIFT is a shift in RA scaled by cos (Dec_0) as Ra_new(i) = RA_0 + RASHIFT(i) / cos (Dec_0) where _0 => the tangent point in the uv data. This is a change for 15OCT99 from shifts in -SIN projection (which do not work for -NCP data and large angles). If the UV data have been rotated then RASHIFT and DECSHIFT refer to X and Y in the new coordinate system. NFIELD values of RASHIFT will be used as initial values before BOXFILE is read - field centers in the file will override the RASHIFT values. DECSHIFT....Declination shift of map center from tangent point of each field in asec. Map center = tangent point + shift. If Y>0 shifts map center to north. NFIELD values of DECSHIFT will be used as initial values before BOXFILE is read - field centers in the file will override the DECSHIFT values. NBOXES......Number (<=50) of rectangular or circular search boxes to search on the first field; the Clean windows in all other fields are given in BOXFILE. If any boxes for field 1 appear in BOXFILE, NBOXES and CLBOX are ignored. CLBOX.......A 4x50 array with the parameters of each box. 0 => use window specified in FLDSIZE. CLBOX(1,i)=-1 indicates a circle of radius CLBOX(2,i) pixels centered on (CLBOX(3,i), CLBOX(4,i)). CLBOX(1,i) >= 0 indicates a rectangular box. DOBLANK.....True (> 0) => pixels outside Clean boxes are represented with magic-value blanks; otherwise 0's are used. When FLATN is run, 0's are interpolated and averaged causing interesting but sometimes odd effects. Blanks are usually better. DOWEDGE.....True (> 0) => insert the field number in all Clean windows that are large enough. Image intensity 2 is used for window boundaries, 1 for Clean windows outside the numbers and 3 times this for numbers. DOWEDGE 2 telss the task to make the numbers rather larger (for TVLODs with TXINC and TYINC > 1). Again FLATN's interpolation can do some odd things. ----------------------------------------------------------------