探究大气生态系统：1996年BOREAS项目中南北研究区SLICER数据详解

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【摘要】  BOREAS Scanning Lidar Imager of Canopies by Echo Recovery (SLICER): Level-3 Data简介为支持 BOREal 生态系统-大气研究 (BOREAS)，在南部和北部研究区（分别为 SSA 和 NSA）的所有塔通量 (TF) 站点以及研究区之间的横断面上获取了回波恢复扫描激光雷达冠层成像仪 (SLICER) 数据。数据是...

 BOREAS Scanning Lidar Imager of Canopies by Echo Recovery (SLICER): Level-3 Data

简介

为支持 BOREal 生态系统-大气研究 (BOREAS)，在南部和北部研究区（分别为 SSA 和 NSA）的所有塔通量 (TF) 站点以及研究区之间的横断面上获取了回波恢复扫描激光雷达冠层成像仪 (SLICER) 数据。数据是在 1996 年 7 月 18 日至 30 日之间的 5 天内获取的。每个塔站点的覆盖范围通常为 40 公里长，每座塔上至少有 3 条线，最多有 10 条线，方向为各种方位角。SLICER 数据与高级固态阵列光谱仪 (ASAS) 高光谱多视角图像同时获取。SLICER 3 级产品由每条航线的二进制文件组成，每个激光发射的数据记录由 13 个参数和 600 字节的波形组成，波形是从地球表面反射的后向散射激光能量的原始记录。

摘要

Site boundaries: (All latitude and longitude given in decimal degrees)

Site (Region)

Westernmost Longitude

Easternmost Longitude

Northernmost Latitude

Southernmost Latitude

Tower Flux (TF) sites in the Southern and Northern Study Areas of the BOReal Ecosystem-Atmosphere Study (BOREAS) region

-106.19779

-98.02747

55.92842

53.62889

Study Area: The North American Datum of 1983 (NAD83) coordinates for the tower sites are:

Site

Western Longitude

Eastern Longitude

Northern Latitude

Southern Latitude

NSA-BVP

-98.02747

-98.02747

55.84225

55.84225

NSA-FEN

-98.42072

-98.42072

55.91481

55.91481

NSA-OBS

-98.48139

-98.48139

55.88007

55.88007

NSA-OJP

-98.62396

-98.62396

55.92842

55.92842

NSA-YJP

-98.28706

-98.28706

55.89575

55.89575

SSA-FEN

-104.61798

-104.61798

53.80206

53.80206

SSA-OBS

-105.11779

-105.11779

53.98717

53.98717

SSA-OJP

-104.69203

-104.69203

53.91634

53.91634

SSA-YJP

-104.64529

-104.64529

53.87581

53.87581

SSA-9OA

-106.19779

-106.19779

53.62889

53.62889

SSA-9YA

-105.32314

-105.32314

53.65601

53.65601

Companion File Information:

Companion File Name

Description

BOREAS_SLICER_NASA-LAPF_Instrument_and_DataDescription.pdf

This document describes the Scanning Lidar Imager of Canopies by Echo Recovery (SLICER), an airborne laser altimeter and surface lidar instrument and data product description.

BOREAS_SLICER_NASA-LAPG_TechnicalOverview.pdf

Technical Overview of Boreas Slicer. Legacy guide format with 20 detailed sections.

SLICER_inventory.csv

Slicer inventory file. See the descriptions of the parameters contained in the SLICER inventory file in the table below.

ELEVDIFF_readme.txt

Script used to Measure the Elevation Difference

FLUXTOWR_SUMMARY.txt

Summary that lists, for each SLICER flight line, the BOREAS TF site(s) crossed by that flight line, and the approximate laser shot number in the data record closest to the tower.

Code_PRO.zip

Programs for use in IDL for interactively viewing and editing the data

Flight_Line_Plots.zip

gif plots of location map, roll & pitch on the line, and profiles of elevation and total pulse width for each flight line

Flight_Transect_Files.zip

Detailed flight line maps showing the location of the laser footprint ground tracks in the vicinity of each TF site.

Log_Notes.zip

Instrument operator log notes for each flight day

Trajectory_Files_and_Plots.zip

 GPS aircraft trajectory files stored as ASCII data. composed of one header record and then a data record for each GPS epoch. The header record consists of one parameter and a data record consists of eight parameters.  The naming convention for these files consists of an eight-character name and a .trj suffix.  The eight characters consist of YY_MM_DD, where YY is the last two digits of the year in which the data were collected, MM is the month of the year, and DD is the day of the month.

Descriptions of the parameters contained in the SLICER inventory file

Column Name

Unit of Measurement

Description

Spatial_Coverage

The general term used to denote the spatial area over which the data were collected.

Date_Obs

DD-MON-YYYY

The date on which the data were collected

Start_Time

HHMM GMT

The starting GPS time for the data collected

End_Time

HHMM GMT

The ending GPS time for the data collected

Run_Start_Lat

Decimal Degrees

The WGS84 latitude coordinate at the beginning of the data line

Run_Start_Long

Decimal Degrees

The WGS84 longitude coordinate at the beginning of the data line

Run_End_Lat

Decimal Degrees

The WGS84 latitude coordinate at the end of the data line

Run_End_Long

Decimal Degrees

The WGS84 longitude coordinate at the end of the data line

Num_Shots

Count

The number of laser pulses for the data line

CRTFCN_Code

The BOREAS certification level of the data.  Examples are CPI (Checked by PI), CGR (Certified by Group), PRE (Preliminary), and CPI-??? (CPI but questionable).

代码

!pip install leafmap
!pip install pandas
!pip install folium
!pip install matplotlib
!pip install mapclassify
 
import pandas as pd
import leafmap
 
url = "https://github.com/opengeos/NASA-Earth-Data/raw/main/nasa_earth_data.tsv"
df = pd.read_csv(url, sep="\t")
df
 
leafmap.nasa_data_login()
results, gdf = leafmap.nasa_data_search(
    short_name="ABoVE_ASCENDS_XCO2_2050",
    cloud_hosted=True,
    bounding_box=(-106.2, 53.63, -98.03, 55.93),
    temporal=("1996-07-18", "1996-07-30"),
    count=-1,  # use -1 to return all datasets
    return_gdf=True,
)
gdf.explore()
 
#leafmap.nasa_data_download(results[:5], out_dir="data")

引用

Harding, D. 2016. BOREAS Scanning Lidar Imager of Canopies by Echo Recovery (SLICER): Level-3 Data. ORNL DAAC, Oak Ridge, Tennessee, USA. BOREAS Scanning Lidar Imager of Canopies by Echo Recovery (SLICER): Level-3 Data, https://doi.org/10.3334/ORNLDAAC/508

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