NEON AOP 表面定向反射率数据是一种高光谱 VSWIR（可见光到短波红外）数据产品，包含 426 个波段

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发布于 2025-02-03 08:22:47

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文章被收录于专栏：GEE数据专栏，GEE学习专栏，GEE错误集等专栏GEE数据专栏，GEE学习专栏，GEE错误集等专栏

简介

NEON AOP 表面定向反射率数据是一种高光谱 VSWIR（可见光到短波红外）数据产品，包含 426 个波段，波长从 ~380 nm 到 2510 nm。波长在 1340-1445 nm 和 1790-1955 nm 之间的波段设置为-100；这些波段是水蒸气吸收波段，没有有效值。数据集还包含 QA 栅格波段（B427 - B442）。主要处理步骤包括正射矫正和大气校正。数据由美国国家航空航天局喷气推进实验室（JPL）制造的 AVIRIS-NG 传感器的三个 NEON 成像分光计单元之一收集。利用云层覆盖最少的飞行线路上的最下端像素，将反射率转换为马赛克。空间分辨率为 1 米，光谱分辨率为 ~5 纳米。图像属性中提供了每个波段的中心波长和最大半宽（FWHM）。

摘要

Dataset Availability

2013-01-01T00:00:00 -

Dataset Provider

NEON

Contact

Contact information not available.

Collection Snippet

Copied

ee.ImageCollection("projects/neon-prod-earthengine/assets/HSI_REFL/001")

Resolution

1 meters

Name	Type	Description
AOP_VISIT_NUMBER	Int	Unique visit number to the NEON site.
CITATION	String	Data citation. See NEON Data Policies and Citation Guidelines.
DOI	String	Digital Object Identifier. NEON data that have been released are assigned a DOI.
FLIGHT_YEAR	Int	Year the data were collected.
NEON_DOMAIN	String	NEON eco-climatic domain code, "D01" to "D20". See NEON Field Sites and Domains.
NEON_SITE	String	NEON four-digit site code. See NEON Field Sites.
NEON_SITE_NAME	String	Full name of the NEON site. See NEON Field Sites.
NEON_DATA_PROD_URL	String	NEON data product url. Always set to: NEON \| Data Product.
PROVISIONAL_RELEASED	String	Whether the data are Provisional or Released. See NEON Data Revisions and Release.
RELEASE_YEAR	Int	If data are released, the year of the NEON Release Tag.
SCALE_FACTOR	Double	Reflectance scale factor.
SENSOR_ID	String	ID of NEON Imaging Spectrometer (NIS), or Global Airborne Observatory (GAO): "NIS1", "NIS2", "NIS3", "GAO".

代码

// Read in the NEON AOP Bidirectional Reflectance Image Collection
var refl002 = ee.ImageCollection(
  "projects/neon-prod-earthengine/assets/HSI_REFL/002");

// Display available images in the HSI_REFL/002 Image Collection
print('NEON Bidirectional Reflectance Images', refl002.aggregate_array('system:index'))

// Specify the start and end dates and filter by date range
var startDate = ee.Date('2022-01-01');
var endDate = startDate.advance(1, 'year');
var refl002_2022 = refl002.filterDate(startDate, endDate);

// Filter by NEON site name (see https://www.neonscience.org/field-sites/explore-field-sites)
var reflLIRO_2022 = refl002_2022.filter('NEON_SITE == "LIRO"').mosaic();

// Define the visualization parameters, display the red, green, and blue bands for a true-color image
var rgbVis = {min: 340, max: 2150, bands: ['B053','B035','B019'], gamma: 2}

// Add the reflectance layer to the Map and center on the site
Map.addLayer(reflLIRO_2022, rgbVis, 'LIRO 2022 Bidirectional Reflectance');
Map.setCenter(-89.70, 46.01, 14);

代码2

var refl002 = ee.ImageCollection(
  'projects/neon-prod-earthengine/assets/HSI_REFL/002');

var startDate = ee.Date('2022-01-01');
var endDate = startDate.advance(1, 'year');
var refl002_2022 = refl002.filterDate(startDate, endDate);

var liro2022 = refl002_2022.filter('NEON_SITE == "LIRO"').mosaic();
var liro2022_rgb = liro2022.select(['B053', 'B035', 'B019'])

var lon = -89.7024;
var lat = 46.005;

Map.setCenter(lon, lat, 12);

// Degrees in EPSG:3857.
var delta = 0.015;
// Width and Height of the thumbnail image.
var pixels = 256;

var areaOfInterest = ee.Geometry.Rectangle(
  [lon - delta, lat - delta, lon + delta, lat + delta], null, false);

var visParams = {
  min: 128, max: 133,
  dimensions: [pixels, pixels],
  region: areaOfInterest, crs: 'EPSG:3857', format: 'png'};

var image = liro2022_rgb.visualize();
var imageClip = liro2022_rgb.visualize().clip(areaOfInterest);

Map.addLayer(image, {min: 128, max: 133}, 'LIRO 2022 Bidirectional Reflectance RGB Image');

Map.addLayer(areaOfInterest, {color: 'red', opacity: 0.5}, 'Area of Interest');

print(ui.Thumbnail({image: imageClip, params: visParams}));