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+  <section id="Overlay-the-MOC-of-Spitzer-on-a-2MASS-cutout">
+<h1>Overlay the MOC of Spitzer on a 2MASS cutout<a class="headerlink" href="#Overlay-the-MOC-of-Spitzer-on-a-2MASS-cutout" title="Link to this heading">¶</a></h1>
+<div class="nbinput nblast docutils container">
+<div class="prompt highlight-none notranslate"><div class="highlight"><pre><span></span>[1]:
+</pre></div>
+</div>
+<div class="input_area highlight-ipython3 notranslate"><div class="highlight"><pre><span></span>from astropy.io import fits
+from astropy.wcs import WCS as WCS
+from mocpy import MOC
+from astropy.visualization import simple_norm
+import astropy.units as u
+import numpy as np
+import matplotlib.pyplot as plt
+</pre></div>
+</div>
+</div>
+<div class="nbinput nblast docutils container">
+<div class="prompt highlight-none notranslate"><div class="highlight"><pre><span></span>[2]:
+</pre></div>
+</div>
+<div class="input_area highlight-ipython3 notranslate"><div class="highlight"><pre><span></span># load 2MASS cutout covering the galactic plane
+hdu = fits.open(
+    &quot;http://alasky.u-strasbg.fr/hips-image-services/hips2fits?hips=CDS%2FP%2F2MASS%2FK&amp;width=1200&amp;height=700&amp;fov=30&amp;projection=TAN&amp;coordsys=galactic&amp;rotation_angle=0.0&amp;object=gal%20center&amp;format=fits&quot;,
+)
+</pre></div>
+</div>
+</div>
+<div class="nbinput nblast docutils container">
+<div class="prompt highlight-none notranslate"><div class="highlight"><pre><span></span>[3]:
+</pre></div>
+</div>
+<div class="input_area highlight-ipython3 notranslate"><div class="highlight"><pre><span></span># load Spitzer MOC
+moc = MOC.from_fits(&quot;http://skies.esac.esa.int/Spitzer/IRAC1_bright_ISM/Moc.fits&quot;)
+</pre></div>
+</div>
+</div>
+<div class="nbinput nblast docutils container">
+<div class="prompt highlight-none notranslate"><div class="highlight"><pre><span></span>[4]:
+</pre></div>
+</div>
+<div class="input_area highlight-ipython3 notranslate"><div class="highlight"><pre><span></span># create WCS from 2MASS image header
+twomass_wcs = WCS(header=hdu[0].header)
+</pre></div>
+</div>
+</div>
+<div class="nbinput docutils container">
+<div class="prompt highlight-none notranslate"><div class="highlight"><pre><span></span>[5]:
+</pre></div>
+</div>
+<div class="input_area highlight-ipython3 notranslate"><div class="highlight"><pre><span></span>fig = plt.figure(111, figsize=(15, 10))
+ax = fig.add_subplot(1, 1, 1, projection=twomass_wcs)
+moc.fill(ax=ax, wcs=twomass_wcs, alpha=0.3, color=&quot;red&quot;)
+im = ax.imshow(
+    hdu[0].data,
+    origin=&quot;lower&quot;,
+    norm=simple_norm(hdu[0].data, &quot;sqrt&quot;, min_cut=0, max_cut=150),
+)
+</pre></div>
+</div>
+</div>
+<div class="nboutput nblast docutils container">
+<div class="prompt empty docutils container">
+</div>
+<div class="output_area docutils container">
+<img alt="../../_images/_collections_notebooks_FITS-image-pixels-intersecting-MOC_5_0.png" src="../../_images/_collections_notebooks_FITS-image-pixels-intersecting-MOC_5_0.png" />
+</div>
+</div>
+<div class="nbinput nblast docutils container">
+<div class="prompt highlight-none notranslate"><div class="highlight"><pre><span></span>[6]:
+</pre></div>
+</div>
+<div class="input_area highlight-ipython3 notranslate"><div class="highlight"><pre><span></span># compute skycoords for every pixel of the image
+width = hdu[0].header[&quot;NAXIS1&quot;]
+height = hdu[0].header[&quot;NAXIS2&quot;]
+
+xv, yv = np.meshgrid(np.arange(0, width), np.arange(0, height))
+skycoords = twomass_wcs.pixel_to_world(xv, yv)
+</pre></div>
+</div>
+</div>
+<div class="nbinput nblast docutils container">
+<div class="prompt highlight-none notranslate"><div class="highlight"><pre><span></span>[7]:
+</pre></div>
+</div>
+<div class="input_area highlight-ipython3 notranslate"><div class="highlight"><pre><span></span>ra, dec = skycoords.icrs.ra.deg, skycoords.icrs.dec.deg
+</pre></div>
+</div>
+</div>
+<div class="nbinput docutils container">
+<div class="prompt highlight-none notranslate"><div class="highlight"><pre><span></span>[8]:
+</pre></div>
+</div>
+<div class="input_area highlight-ipython3 notranslate"><div class="highlight"><pre><span></span>mask_in_moc = moc.contains(ra * u.deg, dec * u.deg)
+</pre></div>
+</div>
+</div>
+<div class="nboutput nblast docutils container">
+<div class="prompt empty docutils container">
+</div>
+<div class="output_area stderr docutils container">
+<div class="highlight"><pre>
+/tmp/ipykernel_326933/2840231297.py:1: DeprecationWarning: This method is deprecated and has been replaced by contains_lonlat
+  mask_in_moc = moc.contains(ra * u.deg, dec * u.deg)
+</pre></div></div>
+</div>
+<div class="nbinput nblast docutils container">
+<div class="prompt highlight-none notranslate"><div class="highlight"><pre><span></span>[9]:
+</pre></div>
+</div>
+<div class="input_area highlight-ipython3 notranslate"><div class="highlight"><pre><span></span>img = hdu[0].data
+img_test = img.copy()
+
+img_test[~mask_in_moc] = 0
+</pre></div>
+</div>
+</div>
+<div class="nbinput docutils container">
+<div class="prompt highlight-none notranslate"><div class="highlight"><pre><span></span>[10]:
+</pre></div>
+</div>
+<div class="input_area highlight-ipython3 notranslate"><div class="highlight"><pre><span></span>fig = plt.figure(111, figsize=(15, 10))
+ax = fig.add_subplot(1, 1, 1, projection=twomass_wcs)
+
+im = ax.imshow(
+    img_test,
+    origin=&quot;lower&quot;,
+    norm=simple_norm(hdu[0].data, &quot;sqrt&quot;, min_cut=0, max_cut=150),
+)
+</pre></div>
+</div>
+</div>
+<div class="nboutput nblast docutils container">
+<div class="prompt empty docutils container">
+</div>
+<div class="output_area docutils container">
+<img alt="../../_images/_collections_notebooks_FITS-image-pixels-intersecting-MOC_10_0.png" src="../../_images/_collections_notebooks_FITS-image-pixels-intersecting-MOC_10_0.png" />
+</div>
+</div>
+<div class="nbinput docutils container">
+<div class="prompt highlight-none notranslate"><div class="highlight"><pre><span></span>[11]:
+</pre></div>
+</div>
+<div class="input_area highlight-ipython3 notranslate"><div class="highlight"><pre><span></span># number of pixels in the mask
+np.sum(img[mask_in_moc])
+</pre></div>
+</div>
+</div>
+<div class="nboutput nblast docutils container">
+<div class="prompt highlight-none notranslate"><div class="highlight"><pre><span></span>[11]:
+</pre></div>
+</div>
+<div class="output_area docutils container">
+<div class="highlight"><pre>
+8690767.0
+</pre></div></div>
+</div>
+<div class="nbinput docutils container">
+<div class="prompt highlight-none notranslate"><div class="highlight"><pre><span></span>[12]:
+</pre></div>
+</div>
+<div class="input_area highlight-ipython3 notranslate"><div class="highlight"><pre><span></span># number of pixels in the entire image
+np.sum(img)
+</pre></div>
+</div>
+</div>
+<div class="nboutput nblast docutils container">
+<div class="prompt highlight-none notranslate"><div class="highlight"><pre><span></span>[12]:
+</pre></div>
+</div>
+<div class="output_area docutils container">
+<div class="highlight"><pre>
+14976694.0
+</pre></div></div>
+</div>
+</section>
+
+
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+          </div>
+        </div>
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+<li><a class="reference internal" href="#">Overlay the MOC of Spitzer on a 2MASS cutout</a></li>
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