feat: add eo extension

stac/examples/eo/item.json

@@ -0,0 +1,150 @@
+{
+  "stac_version": "1.0.0",
+  "stac_extensions": [
+    "https://stac-extensions.github.io/eo/v1.1.0/schema.json"
+  ],
+  "type": "Feature",
+  "id": "20201211_223832_CS2",
+  "bbox": [
+    172.91173669923782,
+    1.3438851951615003,
+    172.95469614953714,
+    1.3690476620161975
+  ],
+  "geometry": {
+    "type": "Polygon",
+    "coordinates": [
+      [
+        [
+          172.91173669923782,
+          1.3438851951615003
+        ],
+        [
+          172.95469614953714,
+          1.3438851951615003
+        ],
+        [
+          172.95469614953714,
+          1.3690476620161975
+        ],
+        [
+          172.91173669923782,
+          1.3690476620161975
+        ],
+        [
+          172.91173669923782,
+          1.3438851951615003
+        ]
+      ]
+    ]
+  },
+  "properties": {
+    "datetime": "2020-12-11T22:38:32.125Z",
+    "created": "2020-12-12T01:48:13.725Z",
+    "updated": "2020-12-12T01:48:13.725Z",
+    "platform": "cool_sat2",
+    "instruments": [
+      "cool_sensor_v1"
+    ],
+    "gsd": 0.66,
+    "eo:cloud_cover": 1.2,
+    "eo:snow_cover": 0
+  },
+  "collection": "eo-collection",
+  "links": [
+    {
+      "rel": "root",
+      "href": "./collection.json",
+      "type": "application/json",
+      "title": "Simple Example Collection"
+    },
+    {
+      "rel": "parent",
+      "href": "./collection.json",
+      "type": "application/json",
+      "title": "Simple Example Collection"
+    },
+    {
+      "rel": "collection",
+      "href": "./collection.json",
+      "type": "application/json",
+      "title": "Simple Example Collection"
+    }
+  ],
+  "assets": {
+    "analytic": {
+      "href": "https://storage.googleapis.com/open-cogs/stac-examples/20201211_223832_CS2_analytic.tif",
+      "type": "image/tiff; application=geotiff; profile=cloud-optimized",
+      "title": "4-Band Analytic",
+      "roles": [
+        "data"
+      ],
+      "eo:bands": [
+        {
+          "name": "band1",
+          "common_name": "blue",
+          "center_wavelength": 0.47,
+          "full_width_half_max": 0.07,
+          "solar_illumination": 1959.66
+        },
+        {
+          "name": "band2",
+          "common_name": "green",
+          "center_wavelength": 0.56,
+          "full_width_half_max": 0.08,
+          "solar_illumination": 1823.24
+        },
+        {
+          "name": "band3",
+          "common_name": "red",
+          "center_wavelength": 0.645,
+          "full_width_half_max": 0.09,
+          "solar_illumination": 1512.06
+        },
+        {
+          "name": "band4",
+          "common_name": "nir",
+          "center_wavelength": 0.8,
+          "full_width_half_max": 0.152,
+          "solar_illumination": 1041.63
+        }
+      ]
+    },
+    "thumbnail": {
+      "href": "https://storage.googleapis.com/open-cogs/stac-examples/20201211_223832_CS2.jpg",
+      "title": "Thumbnail",
+      "type": "image/png",
+      "roles": [
+        "thumbnail"
+      ]
+    },
+    "visual": {
+      "href": "https://storage.googleapis.com/open-cogs/stac-examples/20201211_223832_CS2.tif",
+      "type": "image/tiff; application=geotiff; profile=cloud-optimized",
+      "title": "3-Band Visual",
+      "roles": [
+        "visual"
+      ],
+      "eo:bands": [
+        {
+          "name": "band3",
+          "common_name": "red",
+          "center_wavelength": 0.645,
+          "full_width_half_max": 0.09
+        },
+        {
+          "name": "band2",
+          "common_name": "green",
+          "center_wavelength": 0.56,
+          "full_width_half_max": 0.08
+        },
+        {
+          "name": "band1",
+          "common_name": "blue",
+          "center_wavelength": 0.47,
+          "full_width_half_max": 0.07
+        }
+      ]
+    }
+  }
+}

stac/src/extensions/electro_optical.rs

@@ -0,0 +1,82 @@
+//! The [electro-optical](https://github.com/stac-extensions/eo) extension.
+
+use crate::Extension;
+use serde::{Deserialize, Serialize};
+
+/// EO data is considered to be data that represents a snapshot of the Earth for
+/// a single date and time.
+///
+/// It could consist of multiple spectral bands in any part of the
+/// electromagnetic spectrum. Examples of EO data include sensors with visible,
+/// short-wave and mid-wave IR bands (e.g., the OLI instrument on Landsat-8),
+/// long-wave IR bands (e.g. TIRS aboard Landsat-8).
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ElectroOptical {
+    /// An array of available bands where each object is a [Band].
+    ///
+    /// If given, requires at least one band.
+    #[serde(skip_serializing_if = "Vec::is_empty", default)]
+    pub bands: Vec<Band>,
+
+    /// Estimate of cloud cover, in %.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub cloud_cover: Option<f64>,
+
+    /// Estimate of snow and ice cover, in %.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub snow_cover: Option<f64>,
+}
+
+/// [Spectral
+/// bands](https://www.sciencedirect.com/topics/earth-and-planetary-sciences/spectral-band)
+/// in an [Asset](crate::Asset).
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Band {
+    /// The name of the band (e.g., "B01", "B8", "band2", "red").
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub name: Option<String>,
+
+    /// The name commonly used to refer to the band to make it easier to search for bands across instruments.
+    ///
+    /// See the list of [accepted common names](https://github.com/stac-extensions/eo#common-band-names).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub common_name: Option<String>,
+
+    /// Description to fully explain the band.
+    ///
+    /// [CommonMark 0.29](http://commonmark.org/) syntax MAY be used for rich text representation.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub description: Option<String>,
+
+    /// The center wavelength of the band, in micrometers (μm).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub center_wavelength: Option<f64>,
+
+    /// Full width at half maximum (FWHM).
+    ///
+    /// The width of the band, as measured at half the maximum transmission, in
+    /// micrometers (μm).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub full_width_half_max: Option<f64>,
+
+    /// The solar illumination of the band, as measured at half the maximum transmission, in W/m2/micrometers.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub solar_illumination: Option<f64>,
+}
+
+impl Extension for ElectroOptical {
+    const IDENTIFIER: &'static str = "https://stac-extensions.github.io/eo/v1.1.0/schema.json";
+    const PREFIX: &'static str = "eo";
+}
+
+#[cfg(test)]
+mod tests {
+    use super::ElectroOptical;
+    use crate::{Extensions, Item};
+
+    #[test]
+    fn item() {
+        let item: Item = crate::read("examples/eo/item.json").unwrap();
+        let _: ElectroOptical = item.extension().unwrap().unwrap();
+    }
+}

stac/src/extensions/mod.rs

@@ -11,7 +11,7 @@
 //! | Extension | Maturity | **stac-rs** supported version |
 //! | -- | -- | -- |
 //! | [Authentication](https://github.com/stac-extensions/authentication) | Proposal | v1.1.0 |
-//! | [Electro-Optical](https://github.com/stac-extensions/eo) | Stable | n/a |
+//! | [Electro-Optical](https://github.com/stac-extensions/eo) | Stable | v1.1.0 |
 //! | [File Info](https://github.com/stac-extensions/file) | Stable | n/a |
 //! | [Landsat](https://github.com/stac-extensions/landsat) | Stable | n/a |
 //! | [Projection](https://github.com/stac-extensions/projection) | Stable | v1.1.0 |
@@ -44,6 +44,7 @@
 //! ```
 
 pub mod authentication;
+pub mod electro_optical;
 pub mod projection;
 pub mod raster;