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#{ RADIOOVERLAY -- Overlay a radio contour on the image display.
procedure radiooverlay (image)
string image { prompt = "Input image" }
real size = 0.25 { prompt = "Query size" }
int ncontours = 0 { prompt = "No. contours to draw" }
bool append = yes { prompt = "Append display?" }
bool verbose = yes { prompt = "Verbose output?" }
string device = "imdred" { prompt = "Overlay device" }
int status = 0 { prompt = "Service status code" }
begin
string img, rimg, imname, ovdev, url, query, base
string fields, pos_all, pos_l, pos_w, restab
real ra, dec, sz
bool verb, app, disp
int siap, count, ncont
img = image # Get params to local variables
sz = size
verb = verbose
app = append
ncont = ncontours
ovdev = device
restab = mktemp ("tmp$res") // ".xml"
rimg = mktemp ("tmp$img") // ".fits"
if (imaccess (img)) {
iferr { wcsinfo (img) } then {
error (0, "Cannot determine image coords for `"//img//"'")
} else {
ra = wcsinfo.midx
dec = wcsinfo.midy
sz = max (wcsinfo.width, wcsinfo.height) / 60.0
if (!app)
display (img, 1, >& "dev$null")
}
} else {
sesame (img, verbose-)
ra = sesame.ra
dec = sesame.dec
if (!app)
dss (img, size=sz, use_display+)
}
# Create temp files for the output
rimg = mktemp ("tmp$rad") // ".fits"
# Get NVSS image, force the use of the SkyView service.
base = "http://skyview.gsfc.nasa.gov/cgi-bin/vo/sia.pl?survey=nvss&"
printf ("POS=%.5f,%.5f&SIZE=%.3f", ra, dec, sz) | scan (query)
url = base // query // "&RUNID=" // vo.runid
# Download the query string.
urlget (url, restab, use_cache+, cache="cache$")
tdump (restab, row=1, col="URL", pwidth=2048, cdfile="dev$null",
pfile="dev$null") | scan (rimg)
# Overlay the contours
contour (rimg, dev=ovdev, title="", perim-, fill+, xres=64, yres=64,
ncontours=ncont, >& "dev$null")
# Clean up.
delete (restab, verify-, >& "dev$null")
imdelete (rimg, >& "dev$null")
end
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