Fix logo size and add overview to each chapter

_static/custom.css

@@ -1,4 +1,3 @@
 div.navbar-brand-box a.navbar-brand img {
-  max-height: unset !important;
-  max-width: 80%
+  max-height: 13em !important;
 }

_toc.yml

@@ -1,17 +1,17 @@
 # Table of contents
 # Learn more at https://jupyterbook.org/customize/toc.html
-- file: README
-  title: "Remote Sensing for Journalism"
+- file: "README.md"
 - part: "Data Retrieval and Processing"
   chapters:
   - file: "sources/01 Overview.md"
   - file: "sources/01a Download from Scihub.ipynb"
   - file: "sources/01b Plot downloaded products.ipynb"
   - file: "sources/01c Coverage analysis.ipynb"
-  - file: "sources/1d Brandenburg mosaic.ipynb"
+  - file: "sources/01d Brandenburg mosaic.ipynb"
   - file: "sources/01e True-color pipeline.ipynb"
 - part: "Spectral Indices"
   chapters:
+  - file: "sources/02 Overview.md"
   - file: "sources/02a NDVI.ipynb"
   - file: "sources/02b Timeseries.ipynb"
     sections:
@@ -21,6 +21,7 @@
   - file: "sources/02e Spectral Indices.ipynb"
 - part: "Burn Ratio Calculations"
   chapters:
+  - file: "sources/03 Overview.md"
   - file: "sources/03a Forest Fire Product Downloads.ipynb"
   - file: "sources/03b Example Initialized Downloads.ipynb"
   - file: "sources/03b Forest Fires 2018 and 2019.ipynb"

sources/02 Overview.md

@@ -0,0 +1,9 @@
+# Overview
+
+The parts of the Sentinel-2 data that extend the visible spectrum can be used to calculate _Spectral Indices_ or _Spectral Indicators_.
+
+These indicators can be used for a range of different tasks. The Normalised Difference in Water Index (NDWI) for example gives information about how likely a pixel represents water, the Bare-Soil Index (BSI) gives an estimate about how likely a pixel represents unvegetaed soil. Other indices give an indication about vegetation health or plant activity using reflectance properties of the ground in different spectra of light.
+
+This chapter explores how to calculate these indices over long and short time spans, leveraging the high spatial resolution to provide highly localized information using these indices.
+
+It ends with a notebook that implements the BSI, the NDWI, the Normalized Difference In Vegetation Index (NDVI) and the Normalized Burn Ratio (NBR) which can be used to determine burn severity after a fire. The implementation is extensible enough to perform many different kinds of index calculations on downloaded products with only minimal changes.

sources/02e Spectral Indices.ipynb

@@ -152,10 +152,12 @@
    "outputs": [],
    "source": [
     "indices = {\n",
-    "    # normalized difference in vegetation\n",
-    "    'ndvi': (div, (sub, 'B08', 'B04'), (add, 'B08', 'B04')),\n",
     "    # normalized burn ratio\n",
     "    'nbr': (div, (sub, 'B08', 'B12'), (add, 'B08', 'B12')),\n",
+    "    # normalized difference in vegetation\n",
+    "    'ndvi': (div, (sub, 'B08', 'B04'), (add, 'B08', 'B04')),\n",
+    "    # normalized difference in water index\n",
+    "    'ndwi': (div (sub, 'B03', 'B08'), (add, 'B03', 'B08')),\n",
     "    # bare soil index\n",
     "    'bsi': (div, (sub, (add, 'B11', 'B04'), (add, 'B08', 'B02')),\n",
     "                 (add, (add, 'B11', 'B04'), (add, 'B08', 'B02')))\n",

sources/03 Overview.md

@@ -0,0 +1 @@
+# Overview