added ws202425 courses

2024-11-14 13:11:04 +01:00
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+//You are now ready to answer the question at the start of this 
+//section - how much forest area was lost in the Republic of the Congo in
+//2012, and how much of that was in protected areas?
+
+// Load country features from Large Scale International Boundary (LSIB) dataset.
+var countries = ee.FeatureCollection('USDOS/LSIB_SIMPLE/2017');
+
+// Subset the Congo Republic feature from countries.
+var congo = ee.Feature(
+  countries
+    .filter(ee.Filter.eq('country_na', 'Rep of the Congo'))
+    .first()
+);
+
+// Subset protected areas to the bounds of the feature of the Republic of the Congo
+// and other criteria. Clip to the intersection with the Republic of the Congo.
+var protectedAreas = ee.FeatureCollection('WCMC/WDPA/current/polygons')
+  .filter(ee.Filter.and(
+    ee.Filter.bounds(congo.geometry()),
+    ee.Filter.neq('IUCN_CAT', 'VI'),
+    ee.Filter.neq('STATUS', 'proposed'),
+    ee.Filter.lt('STATUS_YR', 2010)
+  ))
+  .map(function(feat){
+    return congo.intersection(feat);
+  });
+
+// Get the loss image.
+var gfc2014 = ee.Image('UMD/hansen/global_forest_change_2015');
+var lossIn2012 = gfc2014.select(['lossyear']).eq(12);
+var areaImage = lossIn2012.multiply(ee.Image.pixelArea());
+
+// Calculate the area of loss pixels in the Republic of the Congo.
+var stats = areaImage.reduceRegion({
+  reducer: ee.Reducer.sum(),
+  geometry: congo.geometry(),
+  scale: 30,
+  maxPixels: 1e9
+});
+
+print(
+  'Area lost in the Republic of the Congo:',
+  stats.get('lossyear'),
+  'square meters'
+);
+
+// Calculate the area of loss pixels in the protected areas.
+var stats2 = areaImage.reduceRegion({
+  reducer: ee.Reducer.sum(),
+  geometry: protectedAreas.geometry(),
+  scale: 30,
+  maxPixels: 2e9
+});
+
+print(
+  'Area lost in protected areas:',
+  stats2.get('lossyear'),
+  'square meters'
+);
+
+
+//The only changes between this script and the one just prior are the 
+//addition of the protected area information and changing the script 
+//from looking at overall loss to looking at loss in 2012. This required 
+//two changes. First, there's a new lossIn2012 image which has a 1 where loss
+//was recorded in 2012, 0 otherwise. Second, because the name of the band is different 
+//(lossyear instead of loss) the property name had to change in the print statement.