diff --git a/01-raster-structure.html b/01-raster-structure.html
index c4b72213..f69ccbe9 100644
--- a/01-raster-structure.html
+++ b/01-raster-structure.html
@@ -1361,7 +1361,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/01-raster-structure.html",
   "dateCreated": "2015-10-22",
   "dateModified": "2024-07-02",
-  "datePublished": "2024-09-24"
+  "datePublished": "2024-10-01"
 }
 
   </script><script>
diff --git a/02-raster-plot.html b/02-raster-plot.html
index 5cde32bb..44c599a5 100644
--- a/02-raster-plot.html
+++ b/02-raster-plot.html
@@ -986,7 +986,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/02-raster-plot.html",
   "dateCreated": "2015-10-22",
   "dateModified": "2024-07-02",
-  "datePublished": "2024-09-24"
+  "datePublished": "2024-10-01"
 }
 
   </script><script>
diff --git a/03-raster-reproject-in-r.html b/03-raster-reproject-in-r.html
index 1d37fa6f..2b260152 100644
--- a/03-raster-reproject-in-r.html
+++ b/03-raster-reproject-in-r.html
@@ -560,7 +560,7 @@ <h3 class="callout-title">Exercise</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb8">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -804,7 +804,7 @@ <h3 class="callout-title">Challenge: Extent Change with CRS Change</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Answers </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>The extent for DTM_hill_UTMZ18N_HARV is in UTMs so the extent is in
 meters. The extent for DTM_hill_HARV is in lat/long so the extent is
@@ -920,7 +920,7 @@ <h3 class="callout-title">Challenge: Reproject, then Plot a Digital Terrain Mode
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Answers </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb32">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -979,7 +979,7 @@ <h3 class="callout-title">Challenge: Reproject, then Plot a Digital
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Answers </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>The maps look identical. Which is what they should be as the only
 difference is this one was reprojected from WGS84 to UTM prior to
@@ -1061,7 +1061,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/03-raster-reproject-in-r.html",
   "dateCreated": "2015-10-22",
   "dateModified": "2024-07-02",
-  "datePublished": "2024-09-24"
+  "datePublished": "2024-10-01"
 }
 
   </script><script>
diff --git a/04-raster-calculations-in-r.html b/04-raster-calculations-in-r.html
index c0935947..af9c29a9 100644
--- a/04-raster-calculations-in-r.html
+++ b/04-raster-calculations-in-r.html
@@ -508,7 +508,7 @@ <h3 class="callout-title">Exercise</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb3">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -766,7 +766,7 @@ <h3 class="callout-title">Challenge: Explore CHM Raster Values</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Answers </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>There are missing values in our data, so we need to specify
 <code>na.rm = TRUE</code>.</li>
@@ -979,7 +979,7 @@ <h3 class="callout-title">Challenge: Explore the NEON San Joaquin Experimental R
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Answers </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>Use the <code>lapp()</code> function to subtract the two rasters
 &amp; create the CHM.</li>
@@ -1141,7 +1141,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/04-raster-calculations-in-r.html",
   "dateCreated": "2015-10-22",
   "dateModified": "2024-07-02",
-  "datePublished": "2024-09-24"
+  "datePublished": "2024-10-01"
 }
 
   </script><script>
diff --git a/05-raster-multi-band-in-r.html b/05-raster-multi-band-in-r.html
index 795caa31..d0386c21 100644
--- a/05-raster-multi-band-in-r.html
+++ b/05-raster-multi-band-in-r.html
@@ -1456,7 +1456,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/05-raster-multi-band-in-r.html",
   "dateCreated": "2015-10-22",
   "dateModified": "2024-07-02",
-  "datePublished": "2024-09-24"
+  "datePublished": "2024-10-01"
 }
 
   </script><script>
diff --git a/06-vector-open-shapefile-in-r.html b/06-vector-open-shapefile-in-r.html
index 60bec8aa..5dba4c0d 100644
--- a/06-vector-open-shapefile-in-r.html
+++ b/06-vector-open-shapefile-in-r.html
@@ -962,7 +962,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/06-vector-open-shapefile-in-r.html",
   "dateCreated": "2015-10-22",
   "dateModified": "2024-07-02",
-  "datePublished": "2024-09-24"
+  "datePublished": "2024-10-01"
 }
 
   </script><script>
diff --git a/07-vector-shapefile-attributes-in-r.html b/07-vector-shapefile-attributes-in-r.html
index eab3d8d2..c3aadd11 100644
--- a/07-vector-shapefile-attributes-in-r.html
+++ b/07-vector-shapefile-attributes-in-r.html
@@ -605,7 +605,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Answers
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>To find the number of attributes, we use the <code>ncol()</code>
 function:</li>
@@ -783,7 +783,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Answers
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>First we will save an object with only the boardwalk lines:</p>
 <div class="codewrapper sourceCode" id="cb27">
@@ -840,7 +840,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Answer
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>First we will save an object with only the stone wall lines and check
 the number of features:</p>
@@ -973,7 +973,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Answers
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>First we need to look at the levels of our factor to see what order
 the road types are in:</p>
@@ -1143,7 +1143,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Answers
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>First we explore the <code>BicyclesHo</code> attribute to learn the
 values that correspond to the roads we need.</p>
@@ -1214,7 +1214,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Answers
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <p>First we read in the data and check how many levels there are in the
 <code>region</code> column:</p>
@@ -1351,7 +1351,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/07-vector-shapefile-attributes-in-r.html",
   "dateCreated": "2015-10-22",
   "dateModified": "2024-07-02",
-  "datePublished": "2024-09-24"
+  "datePublished": "2024-10-01"
 }
 
   </script><script>
diff --git a/08-vector-plot-shapefiles-custom-legend.html b/08-vector-plot-shapefiles-custom-legend.html
index 7aae7de6..1f6ccf1e 100644
--- a/08-vector-plot-shapefiles-custom-legend.html
+++ b/08-vector-plot-shapefiles-custom-legend.html
@@ -584,7 +584,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Answers
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>First we need to read in the data and see how many unique soils are
 represented in the <code>soilTypeOr</code> attribute.</p>
@@ -694,7 +694,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Answers
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb14">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -788,7 +788,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/08-vector-plot-shapefiles-custom-legend.html",
   "dateCreated": "2015-10-22",
   "dateModified": "2024-07-02",
-  "datePublished": "2024-09-24"
+  "datePublished": "2024-10-01"
 }
 
   </script><script>
diff --git a/09-vector-when-data-dont-line-up-crs.html b/09-vector-when-data-dont-line-up-crs.html
index 57887a0e..63449e07 100644
--- a/09-vector-when-data-dont-line-up-crs.html
+++ b/09-vector-when-data-dont-line-up-crs.html
@@ -868,7 +868,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/09-vector-when-data-dont-line-up-crs.html",
   "dateCreated": "2015-10-22",
   "dateModified": "2024-07-02",
-  "datePublished": "2024-09-24"
+  "datePublished": "2024-10-01"
 }
 
   </script><script>
diff --git a/10-vector-csv-to-shapefile-in-r.html b/10-vector-csv-to-shapefile-in-r.html
index 481854b1..1e3bac5f 100644
--- a/10-vector-csv-to-shapefile-in-r.html
+++ b/10-vector-csv-to-shapefile-in-r.html
@@ -1076,7 +1076,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/10-vector-csv-to-shapefile-in-r.html",
   "dateCreated": "2015-10-22",
   "dateModified": "2024-07-02",
-  "datePublished": "2024-09-24"
+  "datePublished": "2024-10-01"
 }
 
   </script><script>
diff --git a/11-vector-raster-integration.html b/11-vector-raster-integration.html
index eff37dbb..8d76700b 100644
--- a/11-vector-raster-integration.html
+++ b/11-vector-raster-integration.html
@@ -1001,7 +1001,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/11-vector-raster-integration.html",
   "dateCreated": "2015-10-22",
   "dateModified": "2024-07-02",
-  "datePublished": "2024-09-24"
+  "datePublished": "2024-10-01"
 }
 
   </script><script>
diff --git a/12-time-series-raster.html b/12-time-series-raster.html
index 109c5af2..8de6208e 100644
--- a/12-time-series-raster.html
+++ b/12-time-series-raster.html
@@ -619,7 +619,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Answers
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb10">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -883,7 +883,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Answers
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>First we need to load in the RGB data for Julian day 277 and look at
 its metadata.</p>
@@ -1049,7 +1049,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/12-time-series-raster.html",
   "dateCreated": "2015-10-22",
   "dateModified": "2024-07-02",
-  "datePublished": "2024-09-24"
+  "datePublished": "2024-10-01"
 }
 
   </script><script>
diff --git a/13-plot-time-series-rasters-in-r.html b/13-plot-time-series-rasters-in-r.html
index f2890758..cdbc5244 100644
--- a/13-plot-time-series-rasters-in-r.html
+++ b/13-plot-time-series-rasters-in-r.html
@@ -529,7 +529,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Answers
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Learners can find this information in the help files for the
 <code>theme()</code> function. The parameter to set is called
@@ -764,7 +764,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Answers
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb19">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -868,7 +868,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/13-plot-time-series-rasters-in-r.html",
   "dateCreated": "2015-10-22",
   "dateModified": "2024-07-02",
-  "datePublished": "2024-09-24"
+  "datePublished": "2024-10-01"
 }
 
   </script><script>
diff --git a/14-extract-ndvi-from-rasters-in-r.html b/14-extract-ndvi-from-rasters-in-r.html
index 5133bf87..6de4c281 100644
--- a/14-extract-ndvi-from-rasters-in-r.html
+++ b/14-extract-ndvi-from-rasters-in-r.html
@@ -716,7 +716,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Answers
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>First we will read in the NDVI data for the SJER field site.</p>
 <div class="codewrapper sourceCode" id="cb23">
@@ -812,7 +812,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Answers
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb29">
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@@ -870,7 +870,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Answers
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb32">
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@@ -1026,7 +1026,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Answers
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb41">
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@@ -1131,7 +1131,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/14-extract-ndvi-from-rasters-in-r.html",
   "dateCreated": "2015-10-22",
   "dateModified": "2024-07-02",
-  "datePublished": "2024-09-24"
+  "datePublished": "2024-10-01"
 }
 
   </script><script>
diff --git a/404.html b/404.html
index ab0a9a01..b6b4ce94 100644
--- a/404.html
+++ b/404.html
@@ -452,8 +452,8 @@ <h1>Page not found</h1>
   "url": "https://datacarpentry.org/r-raster-vector-geospatial/404.html",
   "identifier": "https://datacarpentry.org/r-raster-vector-geospatial/404.html",
   "dateCreated": "2015-10-22",
-  "dateModified": "2024-09-24",
-  "datePublished": "2024-09-24"
+  "dateModified": "2024-10-01",
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 <p>The maps look identical. Which is what they should be as the only
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 <p>First we will save an object with only the stone wall lines and check
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 <p>First we need to look at the levels of our factor to see what order
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 <p>First we explore the <code>BicyclesHo</code> attribute to learn the
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 <p>First we need to read in the data and see how many unique soils are
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 <p>First we need to load in the RGB data for Julian day 277 and look at
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 <p>Learners can find this information in the help files for the
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 <p>First we will read in the NDVI data for the SJER field site.</p>
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 <div class="codewrapper sourceCode" id="cb8">
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   <h4 class="accordion-header" id="headingSolution2"> Answers </h4>
 </button>
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+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>The extent for DTM_hill_UTMZ18N_HARV is in UTMs so the extent is in
 meters. The extent for DTM_hill_HARV is in lat/long so the extent is
@@ -922,7 +922,7 @@ <h3 class="callout-title">Challenge: Reproject, then Plot a Digital Terrain Mode
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
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 <div class="codewrapper sourceCode" id="cb32">
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@@ -981,7 +981,7 @@ <h3 class="callout-title">Challenge: Reproject, then Plot a Digital
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Answers </h4>
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 <div class="accordion-body">
 <p>The maps look identical. Which is what they should be as the only
 difference is this one was reprojected from WGS84 to UTM prior to
@@ -1063,7 +1063,7 @@ <h3 class="callout-title">Key Points</h3>
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