Add DD for AHN3 and AHN4 datasets

PiperOrigin-RevId: 705431909

catalog/AHN/AHN_AHN3.jsonnet

@@ -0,0 +1,11 @@
+local ahn = import 'ahn_new.libsonnet';
+
+local id = 'AHN/AHN3';
+local title = 'AHN3: Netherlands AHN 0.5m';
+local description_detail = |||
+  AHN3 Dataset contains the Netherlands AHN 0.5m DSM and DTM variables.
+  AHN3 was measured between 2014 and 2019.
+|||;
+local extent_from = '2014-01-01T00:00:00Z';
+local extent_to = '2019-01-01T00:00:00Z';
+ahn.ahn_dataset(id, title, description_detail, extent_from, extent_to)

catalog/AHN/AHN_AHN4.jsonnet

@@ -0,0 +1,12 @@
+local ahn = import 'ahn_new.libsonnet';
+
+local id = 'AHN/AHN4';
+local title = 'AHN4: Netherlands AHN 0.5m';
+local description_detail = |||
+  AHN4 Dataset contains the Netherlands AHN 0.5m DSM and DTM variables.
+  AHN4 was measured between 2020 and 2022.
+|||;
+local extent_from = '2020-01-01T00:00:00Z';
+local extent_to = '2022-01-01T00:00:00Z';
+
+ahn.ahn_dataset(id, title, description_detail, extent_from, extent_to)

catalog/AHN/ahn_new.libsonnet

@@ -0,0 +1,100 @@
+local subdir = 'AHN';
+
+local ee_const = import 'earthengine_const.libsonnet';
+local ee = import 'earthengine.libsonnet';
+local spdx = import 'spdx.libsonnet';
+local units = import 'units.libsonnet';
+
+local license = spdx.cc0_1_0;
+local self_ee_catalog_url(id) =
+  ee_const.ee_catalog_url + std.strReplace(id, '/', '_');
+
+{
+  ahn_dataset(id, title, description_detail, extent_from, extent_to):: {
+    stac_version: ee_const.stac_version,
+    type: ee_const.stac_type.collection,
+    stac_extensions: [
+      ee_const.ext_eo,
+    ],
+    id: id,
+    title: title,
+    'gee:type': ee_const.gee_type.image,
+    description: |||
+      The Actueel Hoogtebestand Nederland (AHN) is a file with detailed and
+      precise height data for the whole of the Netherlands. 3D height
+      information was collected from helicopters and aircraft using laser
+      technology. In this way, the height at ground level of every square metre
+      in the Netherlands is known to an accuracy of 5 centimetres. Information
+      is also available about buildings and vegetation.
+
+    ||| + description_detail + |||
+
+      The Digital Terrain Model (DTM) product represents the elevation of the
+      ground, while the Digital Surface Model (DSM) product represents the
+      elevation of the tallest surfaces at that point.
+    |||,
+    license: license.id,
+    links: ee.standardLinks(subdir, id),
+    keywords: [
+      'ahn',
+      'dem',
+      'elevation',
+      'geophysical',
+      'lidar',
+      'netherlands',
+    ],
+    providers: [
+      ee.producer_provider('AHN', 'https://www.ahn.nl'),
+      ee.host_provider(self_ee_catalog_url(id)),
+    ],
+    extent: ee.extent(3.35, 50.74, 7.24, 53.55, extent_from, extent_to),
+    summaries: {
+      gsd: [
+        0.5,
+      ],
+      'eo:bands': [
+        {
+          name: 'dtm',
+          description: 'Elevation of the ground',
+          'gee:units': units.meter,
+        },
+        {
+          name: 'dsm',
+          description: 'Elevation of the tallest surfaces at that point',
+          'gee:units': units.meter,
+        },
+      ],
+      'gee:visualizations': [
+        {
+          display_name: 'AHN Netherlands',
+          lookat: {
+            lat: 52.39,
+            lon: 4.78,
+             zoom: 12,
+          },
+          image_visualization: {
+            band_vis: {
+              min: [
+                0.0,
+              ],
+              max: [
+                30.0,
+              ],
+              bands: [
+                'dsm',
+              ],
+            },
+          },
+        },
+      ],
+    },
+    'gee:terms_of_use': |||
+      The datasets of the AHN are available as Open Data.
+      This means that the data can be used by anyone for free and without
+      restrictions. For more information visit the
+      [Open Data](https://www.ahn.nl/open-data/) page. Downloads are available
+      under the terms of the
+      [CC-0 license](https://data.overheid.nl/licenties-voor-hergebruik).
+    |||,
+  },
+}

catalog/AHN/catalog.jsonnet

@@ -21,5 +21,7 @@ local self_url = base_url + base_filename;
     ee.link.child_collection('AHN_AHN2_05M_INT', base_url),
     ee.link.child_collection('AHN_AHN2_05M_NON', base_url),
     ee.link.child_collection('AHN_AHN2_05M_RUW', base_url),
+    ee.link.child_collection('AHN_AHN3', base_url),
+    ee.link.child_collection('AHN_AHN4', base_url),
   ],
 }

examples/AHN/AHN_AHN3.js

@@ -0,0 +1,8 @@
+var dataset = ee.Image('AHN/AHN3/AHN3_20140101');
+var elevation = dataset.select('dsm');
+var elevationVis = {
+  min: -5.0,
+  max: 30.0,
+};
+Map.setCenter(5.76583, 51.855276, 16);
+Map.addLayer(elevation, elevationVis, 'AHN3 dsm');

examples/AHN/AHN_AHN3_preview.js

@@ -0,0 +1,48 @@
+var image = ee.Image('AHN/AHN3/AHN3_20140101');
+
+var greyBackground = ee.Image.constant([128, 128, 128])
+  .rename(['red', 'green', 'blue'])
+  .visualize({
+    min: 0,
+    max: 255,
+    bands: ['red', 'green', 'blue']
+  });
+
+var combinedImage = image.visualize({
+  bands: ['dsm', 'dtm', 'dsm'],
+  min: 0,
+  max: 30
+});
+
+// Merge the grey background with the combined image
+var finalImage = ee.ImageCollection([
+  greyBackground, 
+  combinedImage
+]).mosaic();
+
+// Define the area of interest for the thumbnail
+var pixels = 256;
+var centerLon = 4.91;
+var centerLat = 52.34;
+var areaOfInterest = ee.Geometry.Rectangle(
+  [centerLon - 0.02, centerLat - 0.02, centerLon + 0.02, centerLat + 0.02]
+);
+
+// Define thumbnail parameters
+var thumbnailParams = {
+  dimensions: [pixels, pixels],
+  region: areaOfInterest,
+  crs: 'EPSG:4326',
+  format: 'png'
+};
+
+// Display the map
+Map.setCenter(centerLon, centerLat, 13);
+Map.addLayer(finalImage, {}, 'Combined DSM and DTM with Grey Background');
+
+// Generate and display the thumbnail
+print('Combined DSM and DTM Thumbnail with Grey Background:');
+print(ui.Thumbnail({
+  image: finalImage,
+  params: thumbnailParams,
+}));

examples/AHN/AHN_AHN4.js

@@ -0,0 +1,8 @@
+var dataset = ee.Image('AHN/AHN4/AHN4_20200101');
+var elevation = dataset.select('dsm');
+var elevationVis = {
+  min: -5.0,
+  max: 30.0,
+};
+Map.setCenter(5.76583, 51.855276, 16);
+Map.addLayer(elevation, elevationVis, 'AHN4 dsm');

examples/AHN/AHN_AHN4_preview.js

@@ -0,0 +1,48 @@
+var image = ee.Image('AHN/AHN4/AHN4_20200101');
+
+var greyBackground = ee.Image.constant([128, 128, 128])
+  .rename(['red', 'green', 'blue'])
+  .visualize({
+    min: 0,
+    max: 255,
+    bands: ['red', 'green', 'blue']
+  });
+
+var combinedImage = image.visualize({
+  bands: ['dsm', 'dtm', 'dsm'],
+  min: 0,
+  max: 30
+});
+
+// Merge the grey background with the combined image
+var finalImage = ee.ImageCollection([
+  greyBackground, 
+  combinedImage
+]).mosaic();
+
+// Define the area of interest for the thumbnail
+var pixels = 256;
+var centerLon = 6.21;
+var centerLat = 52.13;
+var areaOfInterest = ee.Geometry.Rectangle(
+  [centerLon - 0.02, centerLat - 0.02, centerLon + 0.02, centerLat + 0.02]
+);
+
+// Define thumbnail parameters
+var thumbnailParams = {
+  dimensions: [pixels, pixels],
+  region: areaOfInterest,
+  crs: 'EPSG:4326',
+  format: 'png'
+};
+
+// Display the map
+Map.setCenter(centerLon, centerLat, 13);
+Map.addLayer(finalImage, {}, 'Combined DSM and DTM with Grey Background');
+
+// Generate and display the thumbnail
+print('Combined DSM and DTM Thumbnail with Grey Background:');
+print(ui.Thumbnail({
+  image: finalImage,
+  params: thumbnailParams,
+}));