Hi Gert,<br><br><div class="gmail_quote">On Tue, Feb 5, 2013 at 4:54 PM, G. Sikkema <span dir="ltr"><<a href="mailto:sikkema@astro.rug.nl" target="_blank">sikkema@astro.rug.nl</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
hi Francesco, <br>
<br>
thanks for the analysis report on completeness for field
KIDS_135_-1.5.<br>
We are currently reprocessing the g,r,i tiles, to see if we can
remove the satellite tracks. </div></blockquote><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div bgcolor="#FFFFFF" text="#000000">
However, the new satellite code has problems removing very faint
satellite tracks (at ~2 times the nosie).<br></div></blockquote><div><br></div><div><div>OK, thanks for the update.</div></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
So in my opinion, it would be good to set the detection threshold at
least to 2 and min_area at 5.<br>
Could you also send the source distribution plots (i.e.:
CONTAMINATION_xy_min3_thre2.0.jpg ) for the following
configurations?:<br>
min_area=5 & detect_thresh=2.5<br>
min_area=5 & detect_thresh=2.0<br>
min_area=3 & detect_thresh=2.5<br>
<br>
And from what band was your source distrubtion plot derived?<br></div></blockquote><div><br></div><div>Pls, find attached here the requested plots. I included all four cases (min_area=3 and threshold=2.0), as I redid</div>
<div>the plots with a different color coding:</div><div>black -> all contaminants in the selected region</div><div>red -> contaminants with S-Ex FLAGS=0</div><div> blue -> contaminants with S-Ex FLAGS between 1 and 3 (i.e. deblended sources, and/or objects contaminated by close neighbors)</div>
<div><br></div><div>Also, all these plots refer to r band, as reported in the new filenames.</div><div><br></div><div>Cheers,</div><div>Francesco</div><div><br></div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">GS<div><div class="h5"><br>
<br>
<br>
<br>
On 02/05/2013 12:51 PM, Francesco La Barbera wrote:
</div></div><blockquote type="cite"><div><div class="h5">Dear All,<br>
<div class="gmail_quote">
<div><br>
</div>
<div>we performed a more detailed study of
completeness/contamination of our KIDS catalogs by comparing</div>
<div>KIDS vs. CFHT photometry in the field of KIDS_135_-1.5.</div>
<div><br>
</div>
<div>Here it's the steps we followed:</div>
<div><br>
</div>
<div>1) We downloaded the last version of the images, that
shouldn't be affected</div>
<div>by the satellite track issue we found in the previous
version of the coadd's.</div>
<div> </div>
<div>1) We ran KIDSCAT on the r-band images, with 6 different
setups, changing DETECTION_MINAREA</div>
<div>and DETECTION_THRESHOLD in the S-Ex .configuration file. We
considered:</div>
<div>MINAREA: 3, 5</div>
<div>THRESHOLD: 1.5, 2.0, 2.5</div>
<div>Besides that, we also ran KIDSCAT on the g and i band
images with MINAREA=3, and THRESHOLD=2.0, 2.5</div>
<div><br>
</div>
<div><br>
</div>
<div>2) The catalogs were matched to the CFHT ones (pls ask
Mario for details)</div>
<div><br>
</div>
<div>3) The first attached plot, CFHT_KIDS_....._THRESHOLD.jpg,
summarizes the completeness/contamination with different
setups for the r-band coadd.</div>
<div>Top and bottom panels correspond to MINAREA=3 and 5,
respectively.</div>
<div>For each panel, the solid curves plot the fraction of
spurious sources (i.e. objects with no matching to CFHT)</div>
<div>as a function of magnitude. We considered magnitudes in the
same aperture of 5'' in both catalogs (KIDS and CFHT).</div>
<div>Curves with different colors correspond to different
DETECTION_THRESHOLDs as labeled.</div>
<div>The completeness mags, for each THRESHOLD value (i.e.
color), are marked with a vertical dashed line.</div>
<div>(Here completeness is defined as the mag value where CFHT
counts keep increasing, while KIDS counts remain
constant/decrease).</div>
<div><br>
</div>
<div>4) The second attached plot shows the spatial distribution
of spurious sources in the area "previously" affected by the
satellite track. </div>
<div><br>
</div>
<div>5) We would conclude as follows:</div>
<div> A) for THRESHOLD=1.5 contamination increases
significantly, up to ~20-22% around the completeness mag</div>
<div> B) completeness improves by ~0.15-0.2mag when moving from
THRESHOLD 2.5 to 2.0, and by the same amount from 2.0 to 1.5.</div>
<div> C) changing MINAREA to 5 we get slightly lower
completeness (by~0.1-0.15mag), and slightly lower
contamination (by a few percent)</div>
<div> D) the satellite track issue is still there</div>
<div><br>
</div>
<div>Depending on what is the maximum level of contamination we
can allow in the catalogs, we think we might adopt either
THRESHOLD=2.5 (current value)</div>
<div>or THRESHOLD=2.0, as in the latter value we get slightly
better completeness, at the price of a bit worst
contamination. </div>
<div>Notice that the contamination fractions are indeed upper
limits (see our previous email on the subject), as there are
many sources</div>
<div>not present in the CFHT catalogs because of (e.g.)
deblending issues. </div>
<div><br>
</div>
<div>Finally, the last attached plot,
CFHT_KIDS_COMPLETENESS_CONTAMINATION_THRESHOLD_g_i_bands.jpg,
shows completeness and contamination</div>
<div>for g band (upper panel) and i band (lower panel), both for
MINAREA=3. Resuts are similar to those for r band. </div>
<div><br>
</div>
<div>Eagerly waiting for your feedback, so that we can finalize
the S-Ex configuration file.</div>
<div><br>
</div>
<div>Cheers,</div>
<div>Francesco, Nicola, Mario</div>
<div><br>
</div>
<div>-------------------------------------------------------------------------------</div>
</div>
<br>
<br>
<fieldset></fieldset>
<br>
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<br>
<br>
<pre cols="72">--
dr. Gert Sikkema
Kapteyn Institute
Zernike Building, room 133
P.O. Box 800
9700 AV Groningen
<a href="mailto:sikkema@astro.rug.nl" target="_blank">sikkema@astro.rug.nl</a>
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