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diff --git a/docs/schedule.html b/docs/schedule.html
@@ -2759,6 +2759,33 @@ <h3 id="apr-4-2024hierarchical-clustering">22. Apr 4, 2024—Hierarchical cluste
 </li>
 <li><a href="worksheets/hierarchical-clustering.Rmd">Worksheet</a></li>
 </ul>
+<h3 id="apr-9-2024visualizing-geospatial-data">23. Apr 9, 2024—Visualizing geospatial data</h3>
+<p class="nospace">
+Materials:
+</p>
+<ul>
+<li><a href="slides/geospatial-data.html">Slides</a><br />
+</li>
+<li><a href="worksheets/geospatial-data.Rmd">Worksheet</a></li>
+</ul>
+<h3 id="apr-11-2024redundant-coding-text-annotations">24. Apr 11, 2024—Redundant coding, text annotations</h3>
+<p class="nospace">
+Materials:
+</p>
+<ul>
+<li><a href="slides/redundant-coding.html">Slides</a><br />
+</li>
+<li><a href="worksheets/redundant-coding.Rmd">Worksheet</a></li>
+</ul>
+<h3 id="apr-16-2024interactive-plots">25. Apr 16, 2024—Interactive plots</h3>
+<p class="nospace">
+Materials:
+</p>
+<ul>
+<li><a href="slides/interactive-plots.html">Slides</a><br />
+</li>
+<li><a href="worksheets/interactive-plots.Rmd">Worksheet</a></li>
+</ul>
 <h2 id="homeworks">Homeworks</h2>
 <p>All homeworks are due by 11:00pm on the day they are due. Homeworks need to be submitted as pdf files on Canvas.</p>
 <h3 id="homework-1-due-jan-25-2024">Homework 1 (due Jan 25, 2024)</h3>

diff --git a/docs/search.json b/docs/search.json
diff --git a/docs/slides/geospatial-data.html b/docs/slides/geospatial-data.html
@@ -19,7 +19,7 @@
 ### Claus O. Wilke
 ]
 .date[
-### last updated: 2023-04-10
+### last updated: 2024-04-08
 ]
 
 ---
@@ -304,6 +304,41 @@
 
 ---
 
+## Getting the data
+
+We'll be working with the `texas_income` dataset:
+
+.tiny-font[
+
+```r
+texas_income &lt;- readRDS(url("https://wilkelab.org/SDS375/datasets/Texas_income.rds"))
+
+texas_income
+```
+
+```
+Simple feature collection with 254 features and 4 fields
+Geometry type: MULTIPOLYGON
+Dimension:     XY
+Bounding box:  xmin: -106.6456 ymin: 25.83738 xmax: -93.50829 ymax: 36.5007
+Geodetic CRS:  NAD83
+First 10 features:
+    FIPS    county median_income  moe                       geometry
+1  48001  Anderson         41327 1842 MULTIPOLYGON (((-96.0648 31...
+2  48003   Andrews         70423 6038 MULTIPOLYGON (((-103.0647 3...
+3  48005  Angelina         44223 1611 MULTIPOLYGON (((-95.00488 3...
+4  48007   Aransas         41690 3678 MULTIPOLYGON (((-96.8229 28...
+5  48009    Archer         60275 5182 MULTIPOLYGON (((-98.95382 3...
+6  48011 Armstrong         59737 4968 MULTIPOLYGON (((-101.6294 3...
+7  48013  Atascosa         52192 3005 MULTIPOLYGON (((-98.80479 2...
+8  48015    Austin         53687 3810 MULTIPOLYGON (((-96.62085 3...
+9  48017    Bailey         37397 8652 MULTIPOLYGON (((-103.0469 3...
+10 48019   Bandera         49863 7193 MULTIPOLYGON (((-99.60332 2...
+```
+]
+
+---
+
 ## The **sf** package: Simple Features in R
 
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