2015 年全球红树林冠层高度图 12 米分辨率
从 TanDEM-X 导出的全球红树林树冠高度图
简介
这篇论文目前正在接受《自然-科学数据》杂志的审查，一旦论文发表，引用信息将会更新。 请在使用本数据集时注意这一点 本数据集提供了 2015 年全球红树林冠层高度图，分辨率为 12 米。 树冠高度估计值来自 TanDEM-X 数字表面模型，并通过 GEDI 激光雷达数据进行了校准和验证。 数据集涵盖北纬 34 度至南纬 39 度的环赤道带，涵盖全球大部分红树林生态系统。 该数据集包括 1443 个 GeoTIFF 文件，其中包含全球红树林树冠高度图，按 1°×1° 分块排列。 每个 GeoTIFF 文件代表一个瓦片，命名如下： TDM1_DEM__10_Y##X###_DEM_EGM08_GMW314_2015_WM_hcap_cal.tif，其中 Y##X#### 表示瓦片西南角的纬度（Y ="N "或 "S"）和经度（X ="W "或 "E"）坐标。 这些冠层高度图有助于评估调节红树林生态系统森林结构和碳循环动态的局部尺度地球物理和环境条件。 这些树冠高度图有助于评估调节红树林生态系统中森林结构和碳循环动态的当地尺度地球物理和环境条件。
数据集说明
数据获取与材料¶ 在数据获取与材料方面，数据来源包括德国航空航天中心（DLR）TanDEM-X 任务提供的数字高程模型（DEM）数据，Rizzoli 等人在 2017 年对此进行了报道。 全球红树林观察（GMW）地图提供了全球红树林范围地图，Bunting 等人在 2022 年对此进行了详细介绍。 此外，还使用了全球生态系统动态调查 (GEDI) L2A 数据，Dubayah 等人在 2020 年对此进行了记录。
变量
| haracteristic | Description |
|---|---|
| Spatial Coverage | Circum-equatorial band from 34° N to 39° S |
| Spatial Resolution | 12 m |
| Temporal Coverage | Mangrove height maps: 2015; GEDI L2A mangrove heights: 2019-04-18 to 2022-05-22 |
| Temporal Resolution | One-time estimates for nominal year 2015 of maximum canopy height. GEDI data were collected between April 2019 and May 2022. |
| Data File Formats | Cloud optimized GeoTIFF (.tif) and CSV (*.csv) |
| Number of Files | 1443 GeoTIFF files and 1 CSV file |
GeoTIFF Characteristics
- Coordinate system: geographic coordinates using WGS 1984 datum with elevation (EPSG: 4979)
- Pixel resolution: 0.000111 degrees (~12 m)
- Number of bands: one
- Pixel values: maximum canopy height in meters
- No data value: All pixels are valid, but pixels without mangroves have a value of zero.
GEDI_MANGROVE_HT 图层包含用于生成 GeoTIFF 文件的各个 GEDI L2A 图块的红树林高度。
| Variable | GEDI L2A variable name | Units | Description |
|---|---|---|---|
| GEDI_file_name | - | - | Name of the GEDI file |
| beam | Beam ID | - | Beam number (0-11) |
| delta_time | delta_time | YYYY-MM-DD HH:MM:SS.SSSSSS+00:00 | Transmit time of the shot |
| shot_number | shot_number | 1 | Unique shot ID |
| lat_lowestmode | lat_lowestmode | degrees | Latitude of center of lowest mode |
| lon_lowestmode | lon_lowestmode | degrees | Longitude of center of lowest mode |
| channel | channel | 1 | Channel number (0-7) |
| degrade_flag | degrade_flag | flag | Non-zero values indicate the shot occurred during a degraded period |
| digital_elevation_model | digital_elevation_model | m | Digital elevation model height above the WGS84 ellipsoid. Interpolated at latitude_bin0 and longitude_bin0 from the TandemX 90m product. |
| digital_elevation_model_srtm | digital_elevation_model_srtm | m | Shuttle Radar Topography Mission (SRTM) elevation at GEDI footprint location |
| elev_highestreturn | elev_highestreturn | m | Elevation of highest detected return relative to reference ellipsoid |
| elev_lowestmode | elev_lowestmode | m | Elevation of lowest mode |
| elevation_bias_flag | elevation_bias_flag | flag | Elevations potentially affected by 4bin (~60 cm) ranging error |
| energy_total | energy_total | 1 | Integrated counts in the return waveform relative to the mean nise level |
| landsat_treecover | landsat_treecover | percent | Tree cover in the year 2010, defined as canopy closure for all L2A vegetation taller than 5 m in height (Hansen et al., 2013). Encoded as a percentage per output grid cell. |
| landsat_water_persistence | landsat_water_persistence | percent | The percent UMD GLAD Landsat observations with classified Derived surface water between 2018 and 2019. Values >80 usually represent permanent water, while values <10 represent permanent land. |
| urban_proportion | urban_proportion | percent | The percentage proportion of land area within a focal area surrounding each shot that is urban land cover. Urban land cover is derived from the DLR 12 m resolution TanDEM-X Global Urban Footprint Product. |
| mean_sea_surface | mean_sea_surface | m | Mean sea surface height above the WGS84 ellipsoid, includes the geoid. Interpolated at latitude_bin0 and longitude_bin0 from DTU15. |
| num_detectedmodes | num_detectedmodes | 1 | Number of detected modes in rxwaveform |
| quality_flag | quality_flag | flag | Flag simplifying selection of most useful data |
| rh | rh | m | Relative height metrics at 98% interval |
| rx_energy | rx_energy | 1 | total energy f rxwaveform, mean noise removed |
| selected_algorithm | selected_algorithm | - | ID of algorithm selected as identifying the lowest non-noise mode |
| sensitivity | sensitivity | degrees | Maximum canopy cover that can be penetrated considering th NR of the waveform |
| solar_elevation | solar_elevation | degrees | The elevation of the sun position vector from the laser bounce point position in the local ENU frame. The angle is measured from the East-North plane and is positive Up. |
| surface_flag | surface_flag | flag | Indicates elev_lowestmode is within 300 m of DEM or MSS |
| egm_08 | m | Elevation over the EGM 2008 geoid | |
| tdx_max | m | Maximum TanDEM-X DEM value from the pixels overlapping the GEDI footprint | |
| tdx_std | m | Standard deviation of TanDEM-X DEM values from the pixels overlapping the GEDI footprint | |
| tdx_mean | m | Mean TanDEM-X DEM value from the pixels overlapping the GEDI footprint | |
| tdx_min | m | Minimum TanDEM-X DEM value from the pixels overlapping the GEDI footprint | |
| pixel_count | 1 | Number of TanDEM-X pixels overlapping the GEDI footprint |
代码
var mangrove_tandemx_12 = ee.ImageCollection("projects/sat-io/open-datasets/GLOBAL_MANGROVE_HT_TANDEMX");
var mangrove_gedi = ee.FeatureCollection("projects/space-geographer/assets/GEDI_MANGROVE_HT");
代码链接
数据连接
引用
Simard, M., L. Fatoyinbo, N.M. Thomas, A.E. Stovall, A. Parra, A. Barenblitt, P. Bunting, and I. Hajnsek. 2024. A new global mangrove height map with a 12-meter spatial resolution. In review 2024, Nature Scientific Data.
Simard, M., L. Fatoyinbo, N. Thomas, A. Stovall, A. Parra, M.W. Denbina, D. Lagomasino, and I. Hajnsek. 2024. CMS: Global Mangrove Canopy Height
Maps Derived from TanDEM-X, 2015. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/2251
许可
根据 NASA 地球科学计划数据和信息政策，ORNL DAAC 托管的数据不受限制地开放共享： Simard et al 2024 在 GEE 中的策划：Samapriya Roy Samapriya Roy 关键词 红树林、Tandem-X、树冠高度、GEDI 最后更新 : 2024-07-26
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