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plot_simbad.pro
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plot_simbad.pro
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;+
; NAME: JUDE_FUV_ASTROMETRY
; PURPOSE: Apply astrometry to one image by comparison with another that is
; already corrected
; CALLING SEQUENCE:
; jude_new_astrometry, new_file, ref_file, both_same = both_same, ref_stars = ref_stars
; INPUTS:
; New_file : File to be corrected astrometrically.
; Ref_file : File with accurate astrometry
; OUTPUTS:
; None : New file is updated with correct astrometry
; OPTIONAL INPUT KEYWORDS:
; Both_same : If set, there is no rotation between files. Otherwise,
; the NUV data have to be rotated and reflected.
; Ref_stars : array with two rows: ra and dec
; NOTES:
; Data files are written out as per the original names
; MODIFICATION HISTORY:
; JM: Aug. 18, 2017
;Copyright 2016 Jayant Murthy
;
; Licensed under the Apache License, Version 2.0 (the "License");
; you may not use this file except in compliance with the License.
; You may obtain a copy of the License at
;
; http://www.apache.org/licenses/LICENSE-2.0
;
; Unless required by applicable law or agreed to in writing, software
; distributed under the License is distributed on an "AS IS" BASIS,
; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
; See the License for the specific language governing permissions and
; limitations under the License.
;
;-
;************************* READ_SIMBAD_STARS ***********************
;If I have a list of stars from Simbad, I use that.
function read_simbad_stars, names, ra, dec, stype, mag, xtest, ytest, ztest
;Read stars from simbad using the file I've already created.
;The default name is sim-script, if it doesn't exist, I ask what to do
sim_file_name = 'sim-script'
if (file_test(sim_file_name) eq 0)then begin
print,"Default Simbad list doesn't exist. You have the option to create a new list"
print,"Please go to the following URL: http://simbad.u-strasbg.fr/simbad/sim-fscript"
print,"and enter the following commands in the box. Save the resulting output"
print,"as sim-script."
print, $
'format object form1 "%IDLIST(1) : %COO(d2;C) : %OTYPE(S) : %FLUXLIST(B;F) "'
print, 'set radius 60m'
print, 'query coo ' + strcompress(ra,/rem) + 'd' + $
strcompress(dec,/rem) + 'd'
print, 'format display'
sim_file_name = 'sim-script'
while(file_test(sim_file_name) eq 0) do begin
read, 'Enter file name (Default is sim-script): ', sim_file_name
if (sim_file_name eq '')then sim_file_name = 'sim-script.txt'
endwhile
endif
;Read stars from the Simbad text file
spawn,"wc -l " + sim_file_name,str
wrds = strsplit(str, /extract)
nstars = long(wrds[0])
stars = strarr(nstars)
openr,1,sim_file_name
readf,1,stars
close,1
;In the default Simbad file, the first few lines should be rejected and the
;last line is blank
i = 0
while (strmid(stars[i],0,6) ne '::data')do i = i + 1
stars = stars[i+2:nstars - 2]
nstars = nstars - i - 3
;Variables for the Simbad stars
names = strarr(nstars)
ra = dblarr(nstars)
dec = dblarr(nstars)
stype = strarr(nstars)
mag = fltarr(nstars) + 9999
;Extract the ra, dec, mag
for i = 0, nstars - 1 do begin
if (strcompress(stars[i],/rem) ne '')then begin
wrds = strsplit(stars[i], /extract, ':')
names[i] = wrds[0]
w2 = strsplit(wrds[1],/extract)
ra[i] = double(w2[0])
dec[i] = double(w2[1])
stype[i] = wrds[2]
if (strcompress(wrds[3],/rem) ne '')then $
mag[i] = float(wrds[3]) else $
mag[i] = 9999
endif
endfor
;Get rid of sources where we have no magnitude
s = where(mag lt 20, ns)
if (ns gt 0)then begin
ra = ra[s]
dec = dec[s]
stype = stype[s]
mag = mag[s]
names = names[s]
endif
;Order by magnitude remembering that the brightest have the least magnitude.
s = sort(mag)
ra = ra[s]
dec = dec[s]
stype = stype[s]
mag = mag[s]
names = names[s]
;Convert to Cartesian coordinates.
xtest = cos(ra/180d*!dpi)*cos(dec/180d*!dpi)
ytest = sin(ra/180d*!dpi)*cos(dec/180d*!dpi)
ztest = sin(dec/180d*!dpi)
return, nstars
end
;********************** END READ_SIMBAD_STARS ***********************
;********************* FIND_POINT_SOURCES *************************
pro find_point_sources, new_im, x, y, f,new_max_value,xoff,yoff
x = 0 & y = 0 & f = 0
thresh = .002
siz = size(new_im,/dimensions)
resolution = siz[0]/512
while ((n_elements(x) lt 6) or (n_elements(x) gt 20))do begin
find,new_im,x,y,f,s,r,thresh,1.2,[-1.0,1.0],[.2,1.0]
print,n_elements(x)," stars found with a threshold of ",thresh
if (n_elements(x) gt 20) then thresh = thresh*1.5
if (n_elements(x) lt 6) then thresh = thresh/2
endwhile
if (n_elements(x) ge 2)then begin
srt = reverse(sort(f))
x = x[srt]
y = y[srt]
f = f[srt]
for i = 0, n_elements(x) - 2 do begin
for j = i + 1, n_elements(x) - 1 do begin
d1 = sqrt((x[i] - x[j])^2 + (y[i] - y[j])^2)
if (d1 lt 100)then x[j] = -1
endfor
endfor
endif
q = where(x gt 0, nq)
if (nq gt 0)then begin
x = x[q]
y = y[q]
f = f[q]
endif
end
;**********************END FIND_POINT_SOURCES **********************
;**********************DISPLAY PROGRAMS ***********************
pro display_image, im, max_value, x, y, xpos, ypos
tv,bytscl(rebin(im, 512, 512), 0, max_value),xpos, ypos
plots,/dev, x/8. + xpos, y/8. + ypos, psym=4, symsize=3, col=255
end
function set_limits, grid2, xstar, ystar, boxsize, resolution,$
xmin = xmin, ymin = ymin, display = display
siz = size(grid2)
ndim = siz[1]
xmin = xstar - boxsize*resolution
xmax = xstar + boxsize*resolution
ymin = ystar - boxsize*resolution
ymax = ystar + boxsize*resolution
xmin = 0 > xmin < (ndim - 1)
xmax = (xmin + 1) > xmax < (ndim - 1)
ymin = 0 > ymin < (ndim - 1)
ymax = (ymin + 1) > ymax < (ndim - 1)
if (keyword_set(display))then begin
plots,/dev, [xmin, xmin, xmax, xmax, xmin]/resolution,$
[ymin, ymax, ymax, ymin, ymin]/resolution,$
col=255,thick=2
endif
if (((xmax - xmin) lt 5) or ((ymax - ymin) lt 5)) then begin
h1 = fltarr(2*boxsize*resolution, 2*boxsize*resolution)
endif else h1 = grid2[xmin:xmax, ymin:ymax]
return,h1
end
function check_star_position, new_im, xstar, ystar,new_max_value, xmin, ymin
boxsize = 20
siz = size(new_im, /dimension)
resolution = siz[0]/512
h1 = set_limits(new_im, xstar, ystar, boxsize, resolution, xmin = xmin, ymin = ymin)
siz = size(h1, /dimensions)
r1 = mpfit2dpeak(h1, a1)
if (finite(a1[4]) and finite(a1[5]))then begin
xstar = xmin + a1[4]
ystar = ymin + a1[5]
endif else begin
tcent = total(h1)
xcent = total(total(h1, 2)*indgen(siz[0]))/tcent
ycent = total(total(h1, 1)*indgen(siz[1]))/tcent
xstar = xmin + xcent
ystar = ymin + ycent
endelse
boxsize = 5
h1 = set_limits(new_im, xstar, ystar, boxsize, resolution, xmin = xmin, ymin = ymin)
siz = size(h1, /dimensions)
r1 = mpfit2dpeak(h1, a1)
if (finite(a1[4]) and finite(a1[5]) and (a1[1] gt 0))then begin
xstar = xmin + a1[4]
ystar = ymin + a1[5]
star_found = 1
endif else begin
star_found = 0
endelse
tv,bytscl(rebin(h1,siz[0]*(512/siz[0]),siz[1]*(512/siz[1])) ,0,new_max_value),512,0
plots,(xstar - xmin)*(512/siz[0]),(ystar - ymin)*(512/siz[1]),/psym,symsize=3,col=255,/dev,thick=2
wset,0
return,star_found
end
;*****************END DISPLAY PROGRAMS***************************
pro plot_simbad, ref_file, galex_file, refra, refdec, refx, refy, ref_max_value = ref_max_value
;Initialization
device,window_state = window_state
if (window_state[0] eq 0)then $
window, 0, xs = 1024, ys = 512, xp = 10, yp = 500
;Read data from image files
ref_im = mrdfits(ref_file, 0, ref_hdr, /silent)
ref_time = mrdfits(ref_file, 1, thdr,/silent)
q=where(ref_time eq 0,nq)
if (nq gt 0)then ref_im[q] = 0
siz = size(ref_im, /dimensions)
resolution = siz[0]/512
;Has atrometry been done?
if (strcompress(sxpar(ref_hdr, "ASTRDONE"),/rem) ne "TRUE")then begin
ans=''
ra = sxpar(ref_hdr, "RA_PNT")
dec = sxpar(ref_hdr, "DEC_PNT")
sxaddpar,ref_hdr,"CRVAL1",ra
sxaddpar,ref_hdr,"CRVAL2",dec
sxaddpar,ref_hdr,"CRPIX1",512*resolution/2
sxaddpar,ref_hdr,"CRPIX2",512*resolution/2
sxaddpar,ref_hdr,"CDELT1",-0.000911456/resolution
sxaddpar,ref_hdr,"CDELT2",0.000911456/resolution
sxaddpar,ref_hdr,"CTYPE1","RA---TAN"
sxaddpar,ref_hdr,"CTYPE2","DEC--TAN"
endif else begin
ra = sxpar(ref_hdr, "CRVAL1")
dec = sxpar(ref_hdr, "CRVAL2")
endelse
extast, ref_hdr, ref_astr
;Change image scale
ans='y'
if (n_elements(ref_max_value) eq 0)then ref_max_value = 0.0002 else $
ans = 'n'
while (ans eq 'y')do begin
tv,bytscl(rebin(ref_im,512,512), 0, ref_max_value),0,0
ans_val = ""
read,"Enter new scale; Press return if none ",ans_val
if (ans_val ne "")then ref_max_val = float(ans_val) else ans='n'
endwhile
;Read stars from simbad using the file I've already created. The name
;of the file must be simbad.csv, just because it was easier.
nstars = read_simbad_stars(names, ra, dec, stype, mag, xtest, ytest, ztest)
ad2xy,ra,dec,ref_astr,xsimb,ysimb
plots,/dev,/psym,col=255,thick=2,xsimb/resolution,ysimb/resolution
newxp = fltarr(3)
newyp = fltarr(3)
ans = ""
read,"Would you like to modify the astrometry?",ans
if (ans eq "y")then begin
a = 1000
while (a gt 512) do begin
print,"Select star"
cursor,a,b,/dev & print,a,b
if (a gt 512)then print,"Invalid point clicked"
wait,1 ;(Avoiding double clicks)
endwhile
a = a*resolution
b = b*resolution
star_found = check_star_position(ref_im, a, b, ref_max_value, xmin, ymin)
newxp[0] = a
newyp[0] = b
endif
stop
;Now find point sources in the image.
find_point_sources, ref_im, refxp, refyp, reffp, ref_max_value, 0, 0
dxp = sqrt((refxp/resolution - 256)^2 + (refyp/resolution - 256)^2)
;Our preference is sources near the center.
q = where(dxp lt 256, nq)
if (nq gt 0)then begin
dxp = dxp[q]
refxp = refxp[q]
refyp = refyp[q]
reffp = reffp[q]
endif
q = sort(dxp)
dxp = dxp[q]
refxp = refxp[q]
refyp = refyp[q]
reffp = reffp[q]
nsources = n_elements(refxp)
;Now to find possible identifications
if (nsources gt 1) then begin
refang = sqrt((refxp[1] - refxp[0])^2 + (refyp[1] - refyp[0])^2)
;Are there any Simbad sources which match this angle
nsimb = n_elements(xsimb)
grid_simb = fltarr(nsimb, nsimb)
for i = 0, nsimb - 2 do begin
for j = i+1, nsimb - 1 do begin
grid_simb[i, j] = $
sqrt((xsimb[i] - xsimb[j])^2 + (ysimb[i] - ysimb[j])^2)
endfor
endfor
dst=where(abs(grid_simb -refang) lt 10, ndst)
if (ndst gt 0)then begin
;Let's try solving and see where we get
for isimb = 0, nsimb - 1 do begin
x1 = dst[isimb] mod nsimb
y1 = dst[isimb]/nsimb
newra = [ra[x1], ra[y1]]
newdec = [dec[y1], dec[y1]]
newxp = [refxp[0], refxp[1]]
newyp = [refyp[0], refyp[1]]
new_hdr = ref_hdr
starast, newra, newdec, newxp, newyp, cd, hdr=new_hdr,/right
extast,new_hdr,new_astr
stop
endfor
endif
stop
endif
grid_sources = fltarr(nsources, nsources)
for i = 0, nsources - 1 do $
for j=0, nsources - 1 do $
grid_sources[i, j] = $
sqrt((refxp[i] - refxp[j])^2 + (refyp[i] - refyp[j])^2)
;Let's see if we can get matches
for isource = 0, nsources - 2 do begin
for isimb = 0, nsimb - 1 do begin
for j = isource + 1, nsources - 1 do begin
q=where(abs(grid_simb[isimb,*] - grid_sources[isource, j]) lt 3, nq)
if (nq eq 0)then break
endfor
if (nq gt 0)then print,isource," ",isimb," ",names[isimb],stype[isimb],mag[isimb]
endfor
endfor
;Pick stars
npick = 0
isource = 0
while (npick le 2) do begin
read,"Select first Simbad source (-1 to skip)",isimb
if (isimb ge 0)then begin
if (n_elements(ref_ra) eq 0)then begin
ref_ra = ra[isimb]
ref_dec = dec[isimb]
ref_x = refxp[isource]
ref_y = refyp[isource]
endif else begin
ref_ra = [ref_ra, ra[isimb]]
ref_dec = [ref_dec, dec[isimb]]
ref_x = [ref_x, refxp[isource]]
ref_y = [ref_y, refyp[isource]]
endelse
npick = npick + 1
endif
isource = isource + 1
endwhile
stop
noproc:
end