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Hi Francesco, <br>
thanks for producing the new plots and clarifying the meaning of the
plots,<br>
<br>
I tested the new satellite code on this r-band image: it seems that
the satellite track is now detected and removed. We currently
reprocessing this field (as well as the g and u band). This
particular satellite is relatively narrow and bright. We are
wondering how such plots look if a faint (narrow or broad)
non-detected satellite track is visible in the fov. <br>
<br>
We should discuss the satellite detection issue probably this
afternoon at the telecon.<br>
<br>
And of course also the optimum set of parameters MIN_AREA and
DETECT_THRESH which are directly related to completeness and
spurious objects. <br>
<br>
GS<br>
<br>
<br>
On 02/06/2013 10:12 AM, Francesco La Barbera wrote:
<blockquote
cite="mid:CAOnmKXdpM+bSPpHC+f5Q_mXo2R3BxxYwQR04NTOhkKOF3qHe1Q@mail.gmail.com"
type="cite">Hi Gert,<br>
<br>
<div class="gmail_quote">On Tue, Feb 5, 2013 at 4:54 PM, G.
Sikkema <span dir="ltr"><<a moz-do-not-send="true"
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>
</div>
</div>
<div class="im">
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</blockquote>
<br>
<br>
<pre cols="72">--
dr. Gert Sikkema
Kapteyn Institute
Zernike Building, room 133
P.O. Box 800
9700 AV Groningen
<a moz-do-not-send="true" href="mailto:sikkema@astro.rug.nl" target="_blank">sikkema@astro.rug.nl</a>
homepage: <a moz-do-not-send="true" href="http://www.astro.rug.nl/%7Esikkema" target="_blank">http://www.astro.rug.nl/~sikkema</a>
31-50-3634548
MSN: add: <a moz-do-not-send="true" href="mailto:cubensi@hotmail.com" target="_blank">cubensi@hotmail.com</a> to your MSN
* Popular lectures on:
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- Globular Clusters
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<br>
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<br>
<pre class="moz-signature" cols="72">--
dr. Gert Sikkema
Kapteyn Institute
Zernike Building, room 133
P.O. Box 800
9700 AV Groningen
<a class="moz-txt-link-abbreviated" href="mailto:sikkema@astro.rug.nl">sikkema@astro.rug.nl</a>
homepage: <a class="moz-txt-link-freetext" href="http://www.astro.rug.nl/~sikkema">http://www.astro.rug.nl/~sikkema</a>
31-50-3634548
MSN: add: <a class="moz-txt-link-abbreviated" href="mailto:cubensi@hotmail.com">cubensi@hotmail.com</a> to your MSN
* Popular lectures on:
- Einstein's theory of Relativity
- Globular Clusters
</pre>
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