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Author: plazas

DP1/100_How_to_Use_RSP_Tools/103_Image_access_and_display/103_7_Big_deep_coadd_cutout.ipynb

@@ -22,7 +22,7 @@
     "Data Release: <a href=\"https://dp1.lsst.io\">Data Preview 1</a> <br>\n",
     "Container Size: large <br>\n",
     "LSST Science Pipelines version: r29.2.0 <br>\n",
-    "Last verified to run: 2025-09-19 <br>\n",
+    "Last verified to run: 2025-09-22 <br>\n",
     "Repository: <a href=\"https://github.com/lsst/tutorial-notebooks\">github.com/lsst/tutorial-notebooks</a> <br>"
    ]
   },
@@ -68,8 +68,6 @@
    "source": [
     "### 1.1. Import packages\n",
     "\n",
-    "`numpy` is imported for numerical operations and `matplotlib.pyplot` for plotting and visualization.\n",
-    "`lsst.daf.butler.Butler` provides access to datasets, and `lsst.afw.display` is used for displaying astronomical images.\n",
     "Geometry classes from `lsst.geom` handle pixel and sky coordinates: `Box2I`, `Point2I`, and `Extent2I` define integer-based image regions, `Point2D` represents floating-point coordinates, and `SpherePoint` with `degrees` specifies positions on the celestial sphere.\n",
     "`lsst.sphgeom.Box` defines regions on the sky.\n",
     "`GetTemplateTask` (`lsst.ip.diffim`) retrieves template images for image differencing, while `lsst.pipe.tasks.makeDiscreteSkyMap` generates discrete sky maps for defining sky coverage."
@@ -363,6 +361,14 @@
     ")"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "e5f03ac9-72d1-46e1-97be-50f0ce071429",
+   "metadata": {},
+   "source": [
+    "Get the coadd from the data reference."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -373,6 +379,14 @@
     "bcg_coadd = butler.get(bcg_data_ref)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "58613b7a-9f1f-4156-b8ba-cb08c915996d",
+   "metadata": {},
+   "source": [
+    "Get the WCs from the coadd."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -394,6 +408,14 @@
     "                        dec_bcg * degrees)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "f1bb7b34-66e6-4bbf-9381-a66a2bcc021c",
+   "metadata": {},
+   "source": [
+    "Use the plate sclate at the BCG location."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -404,6 +426,14 @@
     "plate_scale_bcg = wcs_bcg.getPixelScale(Point2D(bcg_point)).asArcseconds()"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "e0f9765b-9ec7-472f-9520-b97013e931f5",
+   "metadata": {},
+   "source": [
+    "Set the plate scale in the new skymap."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -602,7 +632,7 @@
     "\n",
     "Reset the `afwDisplay` backend to be Firefly and start the display.\n",
     "A new tab will open, containing the Firefly interface.\n",
-    "Note that Firelfly will use the WCS information to display the image in celestial coordinates."
+    "Note that Firelfly will use the new WCS information to display the image in celestial coordinates."
    ]
   },
   {