ABoVE: Soil Moisture and Active Layer Thickness in Alaska and NWT, Canada, 2008-2020
简介
该数据集提供了不同研究团队在美国阿拉斯加和加拿大西北地区的站点测量的土壤解冻深度和湿度 (STDM) 测量值和介电特性。每个站点有多个观测值，总共 352,719 个观测值。该数据集包括通过机械探测 (6.0%) 或探地雷达 (GPR) (94.0%) 测量的 206,000 个活动层厚度观测值。使用 GPR (22.1%)、Hydrosense I 和 II 探头 (75.3%) 和 DualEM (2.6%) 收集了大约 16,000 个体积含水量测量值。元数据包括位置、时间、地理空间坐标、技术和测量团队。测量值通常在解冻季节快要结束的 8 月和 9 月收集，涵盖 2008 年 6 月 22 日至 2020 年 8 月 15 日期间。
该数据集在相关出版物 Clayton 等人（2021）中被称为“土壤水分和活动层厚度现场测量”（SMALT），包含数千个解冻深度和土壤水分测量数据，这些测量数据收集于巴罗、苏厄德半岛、北坡、费尔班克斯、科尔德富特、育空-库斯科温三角洲、美国阿拉斯加三角洲交界处以及加拿大西北地区及其附近的研究地点。SMALT 包含 206,000 个使用机械探测（6.0%）或探地雷达（GPR）（94.0%）测量的土壤活动层厚度（ALT）观测数据。约 16,000 个体积含水量（VWC）测量数据由 GPR（22.1%）、Hydrosense I 和 II 探头（75.3%）以及 DualEM（2.6%）收集。
摘要
Table 1. Variable names and descriptions in ABoVE_Soil_ThawDepth_Moisture_Validation.csv.
Variable Units Description
site_name Site where measurements were collected
plot Plot at site where measurements were collected
point Point number within a survey
survey_technique Survey technique used by research team
team_name Research team name
organization Research team organization
observer Name of observer associated with the study plots/measurements
observer_email Observer email
latitude Decimal degrees (N) Latitude (N) of the measurement site
longitude Decimal degrees (E) Longitude (E) of the measurement site
PDOP Decimal degrees Position Dilution of Precision; accuracy of the GPS measurement
date YYYY-MM-DD Date of collection
time HH:MM:SS Time of collection; 24-hour clock
ALT_instrument Instrument used to measure Active layer thickness (ALT): probe or GPR
ALT cm Active layer thickness (ALT); thaw depth at time of measurement
ALT_err cm ALT measurement error
VWC_instrument Instrument used to measure volumetric water content (VWC): Hydrosense I, Hydrosense II, DualEM, or ground penetrating radar (GPR)
depth_top cm Depth to the top of the VWC measurement
depth_bottom cm Depth to the bottom of the VWC measurement
attenuation Attenuation of HydroSense measurement
dielectric_permittivity Soil dielectric permittivity
period microseconds Period of HydroSense measurement
VWC percent Volumetric water content
VWC_err percent VWC measurement error
corrected flag Errors corrected from version 1 to 2: 0=no, 1=yes
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"
df = pd.read_csv(url, sep="\t")
df
leafmap.nasa_data_login()
results, gdf = leafmap.nasa_data_search(
short_name="ABoVE_Soil_ThawDepth_Moisture_1903",
cloud_hosted=True,
bounding_box=(-169.51, 55.81, -98.74, 76.69),
temporal=("2016-08-18", "2018-09-12"),
count=-1, # use -1 to return all datasets
return_gdf=True,
)
gdf.explore()
