Data Package Metadata View Summary

Sparse point clouds derived from UAV overflights of the fifteen NPP study sites at Jornada Basin LTER in 2019

General Information

Data Package:

Local Identifier:

knb-lter-jrn.210543004.3

Title:

Sparse point clouds derived from UAV overflights of the fifteen NPP study sites at Jornada Basin LTER in 2019

Alternate Identifier:

DOI PLACE HOLDER

Abstract:

This data package contains sparse point clouds for each of the 15 NPP study sites at the Jornada Basin LTER in southern New Mexico, USA. The point clouds were derived from raw images collected during uncrewed aerial vehicle (UAV) overflight missions conducted in late summer and early autumn of 2019 (1 overflight day per site). For each site one or two missions were flown during an afternoon using a DJI Phantom 4 UAV, and between 450 and 1300 12.4 megapixel RGB images were captured. A subset of images captured at each site were loaded into Agisoft Metashape software to derive points using a structure from motion method. The raw images are not provided but can be made available via project PIs. This data package includes point clouds for all 15 sites as geotiff raster files. Other derived products from these UAV missions, including orthomosaic photos, digital elevation models, and digital terrain models, are available in other EDI data packages (knb-lter-jrn.210543001, knb-lter-jrn.210543002, and knb-lter-jrn.210543003, respectively). This study is complete.

Short Name:

UAS_nppsites Sparse points

Publication Date:

2022-04-25

Language:

English

For more information:
Visit:	https://jrn.lternet.edu
Visit:	DOI PLACE HOLDER

Time Period

Begin:

2019-08-30

End:

2019-11-04

People and Organizations
Contact:	Jornada Basin LTER Information Manager (Jornada Basin LTER/New Mexico State University) [ email ]
Creator:	Wojcikiewicz, Robert (New Mexico State University)
Creator:	Hanan, Niall P (New Mexico State University)
Associate:	Doss, Emily (New Mexico State University, associate scientist)

Data Entities
Data Table Name:	File inventory and metadata
Description:	Inventory table of included data files and associated metadata
Data Table Name:	UAV flight metadata
Description:	Table of metadata for UAV flights providing source imagery for the included datasets
Other Name:	C-CALI sparse point cloud file
Description:	Sparse point cloud for C-CALI site in a .las file

Detailed Metadata

Data Entities

Data Table


Data:	https://pasta-s.lternet.edu/package/data/eml/knb-lter-jrn/210543004/3/094794b87a8ecf9ea59eca9c36e18542
Name:	File inventory and metadata
Description:	Inventory table of included data files and associated metadata
Number of Records:	17
Number of Columns:	23

Table Structure

Object Name:

JRN543004_SparsePointCloud_inventory.csv

Size:

4724 byte

Authentication:

2b6fdde60fbf9c4e85a9d67f092bec8e Calculated By MD5

Text Format:

Number of Header Lines:

Number of Foot Lines:

Record Delimiter:

Orientation:

column

Simple Delimited:

Field Delimiter:	,
Quote Character:	"

Table Column Descriptions

Dataset file path

File name

File size

File format

Missing value code

Coordinate proj string

Number of points

Key point limit

Tie point limit

Vegetation zone

Site ID

Flight ID

Flight date

Images captured

Images used

Processing software

Cam accuracy param

Marker accuracy param

Tiepoint accuracy param

Photo alignment quality param

Dense cloud quality param

File description

Notes

Column Name:

path

filename

filesize

file_format

missing_value_code

coord_proj_str

n_points

key_point_limit

tie_point_limit

veg_zone

site_id

flight_id

flight_date

flight_images_captured

flight_images_used

processing_software

param_camera_accuracy_m

param_marker_accuracy_pixel

param_tiepoint_accuracy_pixel

param_photo_alignment_quality

param_dense_cloud_quality

description

notes

Definition:

Path to file in data package

File name

Size of file (string, M=megabytes; G=Gigabytes)

Format of file

Missing data indicator value in raster (if any)

Coordinate reference system (PROJ4 string)

Number of points in sparse point cloud

Processing parameter - key point limit

Processing parameter - tie point limit

Vegetation zone - there are 5 zones in the NPP study sites

Site identifier (one of the 15 NPP sites)

Flight identifier (see Flight_metadata file)

Date of UAV image capture

Number of images captured by UAV

Number of images used to derive orthomosaic image

Processing software used to derive orthomosaic image

Processing parameter - camera accuracy (meters) used in Agisoft Metashape

Processing parameter - marker accuracy for image coordinates (pixels) used in Agisoft Metashape

Processing parameter - tie point accuracy (pixels) used in Agisoft Metashape

Processing parameter - photo alignment quality setting used in Agisoft Metashape

Processing parameter - dense cloud quality setting used in Agisoft Metashape

Description of file

Notes about the file

Storage Type:

string

integer

string

dateTime

integer

string

float

integer

string

Measurement Type:

nominal

interval

nominal

dateTime

interval

nominal

ratio

interval

nominal

Measurement Values Domain:

Definition

any text

Definition

any text

Definition

any text

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	csv
Definition	Comma separated values file (delimited text format)
Source

Code Definition

Code	las
Definition	LASER (lidar or point cloud) file
Source

Definition

any text

Definition

any text

Unit	number
Type	integer

Unit	number
Type	integer

Unit	number
Type	integer

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	C
Definition	Creosote shrubland vegetation type
Source

Code Definition

Code	G
Definition	Grassland vegetation type
Source

Code Definition

Code	M
Definition	Mesquite dune vegetation type
Source

Code Definition

Code	P
Definition	Playa vegetation type (grassland)
Source

Code Definition

Code	T
Definition	Tarbush vegetation type
Source

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	TAYL
Definition	Taylor well site (tarbush)
Source

Code Definition

Code	TOBO
Definition	Tobosa tank site (playa)
Source

Code Definition

Code	WELL
Definition	West well site (mesquite)
Source

Code Definition

Code	WEST
Definition	West of Jornada road tarbush site (tarbush)
Source

Code Definition

Code	BASN
Definition	Basin site (grassland at lower trailer)
Source

Code Definition

Code	CALI
Definition	Caliche site (creosote shrubland)
Source

Code Definition

Code	COLL
Definition	College Ranch site (playa)
Source

Code Definition

Code	EAST
Definition	East of Jornada road tarbush site (tarbush)
Source

Code Definition

Code	GRAV
Definition	Gravel site (creosote shrubland)
Source

Code Definition

Code	IBPE
Definition	IBP Exclosure site (grassland)
Source

Code Definition

Code	NORT
Definition	North natural vegetation exclosure site (mesquite)
Source

Code Definition

Code	RABB
Definition	Rabbit rain gauge site (mesquite)
Source

Code Definition

Code	SAND
Definition	Sand site (creosote shrubland; formerly UPTR - upper trailer)
Source

Code Definition

Code	SMAL
Definition	Small site (playa)
Source

Code Definition

Code	SUMM
Definition	Mt. Summerford site (grassland)
Source

Definition

any text

Format	YYYY-MM-DD
Precision	1

Unit	number
Type	integer

Unit	number
Type	integer

Definition

any text

Unit	meter
Type	real

Unit	pixel
Type	real

Unit	number
Type	integer

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	high
Definition	High quality parameter
Source

Code Definition

Code	high?
Definition	Uncertain quality parameter - assumed to be high
Source

Code Definition

Code	medium
Definition	Medium quality parameter
Source

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	high
Definition	High quality parameter
Source

Definition

any text

Definition

any text

Missing Value Code:

Code	NA
Expl	Not applicable or unknown

Code	NA
Expl	Not applicable

Code	NA
Expl	Not applicable

Code	NA
Expl	Not applicable or unknown

Code	NA
Expl	Not applicable or unknown

Code	NA
Expl	Not applicable or unknown

Code	NA
Expl	Not applicable

Code	NA
Expl	Not applicable

Code	NA
Expl	Not applicable or unknown

Code	NA
Expl	Not applicable or unknown

Code	NA
Expl	Not applicable or unknown

Code	NA
Expl	Not applicable or unknown

Code	NA
Expl	Not applicable or unknown

Code	NA
Expl	Not applicable or unknown

Code	NA
Expl	Not applicable or unknown

Code	NA
Expl	Not applicable or unknown

Code	NA
Expl	Not applicable or unknown

Code	NA
Expl	Not applicable or unknown

Code	NA
Expl	No comment, quality flag, or additional information available

Accuracy Report:

Accuracy Assessment:

Coverage:

Methods:

Data Table


Data:	https://pasta-s.lternet.edu/package/data/eml/knb-lter-jrn/210543004/3/d59916f14d2140ac06417852605bbd90
Name:	UAV flight metadata
Description:	Table of metadata for UAV flights providing source imagery for the included datasets
Number of Records:	26
Number of Columns:	21

Table Structure

Object Name:

JRN543004_Flight_metadata.csv

Size:

3652 byte

Authentication:

d5b038b513d57ef1db41828695f4acbb Calculated By MD5

Text Format:

Number of Header Lines:

Number of Foot Lines:

Record Delimiter:

Orientation:

column

Simple Delimited:

Field Delimiter:	,
Quote Character:	"

Table Column Descriptions

Flight ID

Flight date

Vegetation zone

Site ID

Start time

End time

Images collected

Height above ground

Front overlap

Side overlap

Camera angle

Drone model

Sensor type

Sensor size

Effective megapixels

Focal length

Field of view

Shutter speed

X resolution

Y resolution

Flight notes

Column Name:

flight_id

date

veg_zone

site_id

start_time

end_time

images_collected

height_m

front_overlap_pct

side_overlap_pct

camera_angle_deg

drone_model

camera_sensor_type

camera_sensor_size_in

effective_megapixels

camera_lens_focallength_mm

camera_lens_FOV_deg

camera_shutter_speed

ind_image_pixels_x

ind_image_pixels_y

notes

Definition:

UAV Flight identification code - aggregation of site, year, and number

Date of UAV flight

Vegetation zone - there are 5 zones in the NPP study sites

Site identifier (one of the 15 NPP sites)

Start time of flight

End time of flight

Number of images collected

Height of UAV above ground surface (m)

Percent front overlap of UAV passes (%)

Percent side overlap of UAV passes (%)

Camera angle relative to vertical

Model of drone

Camera sensor type

Camera sensor size

Effective megapixels captured by camera sensor (millions of pixels)

Focal length of camera lens

Camera lens field of view (degrees)

Shutter speed of camera

Individual camera image X resolution (number of pixels)

Individual camera image Y resolution (number of pixels)

Notes on UAV flight

Storage Type:

string

dateTime

string

dateTime

integer

float

string

float

integer

string

integer

string

Measurement Type:

nominal

dateTime

nominal

dateTime

interval

ratio

nominal

ratio

interval

nominal

interval

nominal

Measurement Values Domain:

Definition

any text

Format	YYYY-MM-DD
Precision	1

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	G
Definition	Grassland vegetation type
Source

Code Definition

Code	M
Definition	Mesquite dune vegetation type
Source

Code Definition

Code	P
Definition	Playa vegetation type (grassland)
Source

Code Definition

Code	T
Definition	Tarbush vegetation type
Source

Code Definition

Code	C
Definition	Creosote shrubland vegetation type
Source

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	BASN
Definition	Basin site (grassland at lower trailer)
Source

Code Definition

Code	CALI
Definition	Caliche site (creosote shrubland)
Source

Code Definition

Code	COLL
Definition	College Ranch site (playa)
Source

Code Definition

Code	EAST
Definition	East of Jornada road tarbush site (tarbush)
Source

Code Definition

Code	GRAV
Definition	Gravel site (creosote shrubland)
Source

Code Definition

Code	IBPE
Definition	IBP Exclosure site (grassland)
Source

Code Definition

Code	NORT
Definition	North natural vegetation exclosure site (mesquite)
Source

Code Definition

Code	RABB
Definition	Rabbit rain gauge site (mesquite)
Source

Code Definition

Code	SAND
Definition	Sand site (creosote shrubland; formerly UPTR - upper trailer)
Source

Code Definition

Code	SMAL
Definition	Small site (playa)
Source

Code Definition

Code	SUMM
Definition	Mt. Summerford site (grassland)
Source

Code Definition

Code	TAYL
Definition	Taylor well site (tarbush)
Source

Code Definition

Code	TOBO
Definition	Tobosa tank site (playa)
Source

Code Definition

Code	WELL
Definition	West well site (mesquite)
Source

Code Definition

Code	WEST
Definition	West of Jornada road tarbush site (tarbush)
Source

Format	hh:mm:ss
Precision	1

Format	hh:mm:ss
Precision	1

Unit	number
Type	integer

Unit	meter
Type	real

Unit	percent
Type	real

Unit	percent
Type	real

Unit	degree
Type	real

Definition

any text

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	CMOS
Definition	CMOS active pixel camera sensor (Complementary metal–oxide–semiconductor)
Source

Definition

any text

Unit	megapixel
Type	real

Unit	millimeter
Type	integer

Unit	degree
Type	integer

Definition

any text

Unit	number
Type	integer

Unit	number
Type	integer

Definition

any text

Missing Value Code:

Code	NA
Expl	Missing value - data not collected or otherwise unavailable

Code	NA
Expl	Missing value - data not collected or otherwise unavailable

Code	NA
Expl	Missing value - data not collected or otherwise unavailable

Code	NA
Expl	No comment, quality flag, or additional information available

Accuracy Report:

Accuracy Assessment:

Coverage:

Methods:

Non-Categorized Data Resource

Name:

C-CALI sparse point cloud file

Entity Type:

otherEntity

Description:

Sparse point cloud for C-CALI site in a .las file

Physical Structure Description:

Object Name:

CCALI_SPARSE_CLOUD.las

Size:

13864584 byte

Authentication:

090de06766e49eafe562a172e8ed9183 Calculated By MD5

Externally Defined Format:

Format Name:

application/vnd.las

Data:

https://pasta-s.lternet.edu/package/data/eml/knb-lter-jrn/210543004/3/eb1d19c902f01c41ef1116f12ecdb759

Data Package Usage Rights

This information is released under the Creative Commons license - Attribution - CC BY (https://creativecommons.org/licenses/by/4.0/). The consumer of these data ("Data User" herein) is required to cite it appropriately in any publication that results from its use. The Data User should realize that these data may be actively used by others for ongoing research and that coordination may be necessary to prevent duplicate publication. The Data User is urged to contact the authors of these data if any questions about methodology or results occur. Where appropriate, the Data User is encouraged to consider collaboration or co-authorship with the authors. The Data User should realize that misinterpretation of data may occur if used out of context of the original study. While substantial efforts are made to ensure the accuracy of data and associated documentation, complete accuracy of data sets cannot be guaranteed. All data are made available "as is." The Data User should be aware, however, that data are updated periodically and it is the responsibility of the Data User to check for new versions of the data. The data authors and the repository where these data were obtained shall not be liable for damages resulting from any use or misinterpretation of the data. Thank you.

Keywords

By Thesaurus:
LTER Core Research Areas	land use and land cover change
LTER Controlled Vocabulary v1	aerial imagery, deserts, elevation, land surface properties, plant cover, remote sensing, shrubs, topography, vegetation
none	LAS file, UAV, drone, height, laser, point cloud, remote sensing, sUAS, sparse points, structure from motion, terrain, unmanned aircraft
Jornada Basin LTER dataset keywords	LTER VII
Jornada Basin project names	study 543
Jornada Basin place names	C-CALI, C-GRAV, C-SAND, CDRRC, G-BASN, G-IBPE, G-SUMM, JER, M-NORT, M-RABB, M-WELL, NPP locations, P-COLL, P-SMAL, P-TOBO, T-EAST, T-TAYL, T-WEST

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

Methods and protocols used in the collection of this data package

Description:

Project outline

Between 30 August 2019 and 4 November 2019, uncrewed aerial vehicle (UAV) missions were flown over the 15 NPP study sites located in the Jornada Basin, southern New Mexico, USA. These sites are associated with the Jornada Basin LTER program. During each mission, which consisted of one or two separate flights, between 450 and 1300 12.4 megapixel RGB images (approximately) were captured. Orthomosaic photos, digital elevation models (DEM), digital terrain models (DTM), and other products have been derived from these data. This data package contains sparse point clouds in .las file format.

Flight and payload information

A DJI Phantom 4 UAV with a 12.4 megapixel camera was used for all missions. Metadata describing each mission related to the included data are found in the "Flight_metadata.csv" file. Important fields include flight start and end times, UAV pass overlaps, UAV height, camera angle, camera sensor specification, camera lens specifications, and number of images collected.

Image post-processing

A subset of the individual images (.jpg files) collected during missions at each site were loaded into Agisoft Metashape software, which uses structure from motion (SFM) technology to generate the sparse point clouds in this data package. These point clouds give horizontal and vertical point coordinates of all ground surface features derived from SFM image processing. Images were aligned and dense clouds were generated at "high" quality unless otherwise noted in the "SparsePoingCloud_inventory.csv" file included in this data package.

Agisoft Photoscan uses a fairly common technique called structure from motion (SFM) which relies on the use of uses mathematical techniques to recover the three dimensional shape and appearance of objects in imagery (Verhoeven, 2011). Exact algorithms used in the software are hard to find due to proprietary restrictions, however a brief, general description of relevant processing for creating orthomosaics are below.

Feature matching across the photos

At the first stage PhotoScan detects points in the source photos which are stable under viewpoint and lighting variations and generates a descriptor for each point based on its local neighborhood. These descriptors are used later to detect correspondences across the photos. This is similar to the well known SIFT approach, but uses different algorithms for a little bit higher alignment quality.

Solving for camera intrinsic and extrinsic orientation parameters

PhotoScan uses a greedy algorithm to find approximate camera locations and refines them later using a bundle-adjustment algorithm. This should have many things in common with Bundler, a software that basically performs the process described here, although we didn’t compare our algorithm with Bundler thoroughly (go to the following link for information on Bundler: https://www.cs.cornell.edu/~snavely/bundler/).

Dense surface reconstruction

The reconstruction process involves pair-wise depth map computation, whereby the program recognizes geometries common among different photographs and creates a surface reconstruction based on how those geometries appear to change in photographs from different positions.

Texture mapping

The texture mapping process parameterizes a surface by dividing the surface into smaller pieces, and then blends source photos to form a texture atlas.

Post-processing and file metadata

Parameters used in processing software, as well as metadata describing the derived sparse point clouds, are included in the "SparsePointCloud_inventory.csv" file. Important parameters used in post-processing with Agisoft software include assumed camera accuracy, the marker accuracy for image coordinates, photo alignment quality settings, and dense cloud quality settings. In addition, file format, image resolution, pixel size in ground area units, coordinate reference system, and other metadata useful for re-using the point cloud data are included in this file.

Related data packages

The raw imagery collected during UAV missions is not publicly available on EDI yet. It can be requested from the PIs. Other derived products from these UAV missions are available at EDI including:

Orthomosaic photos of the sites - knb-lter-jrn.210543001

Digital elevation models (terrain features including vegetation) - knb-lter-jrn.210543003

Digital terrain models (terrain features excluding vegetation) - knb-lter-jrn.210543003

References

Verhoeven, G, 2011. Taking computer vision aloft - archaeological three-dimensional reconstructions from aerial photographs with photoscan. Archaeological Prospection, 18, pp. 67-73.

Semyonov, D., 2011. Algorithms used in Photoscan [Msg 2]. Retrieved May 3, 2020. Message posted to www.agisoft.ru/forum/index.php?topic=89.0.

People and Organizations

Publishers:

Organization:

Environmental Data Initiative

Email Address:

info@environmentaldatainitiative.org

Web Address:

https://environmentaldatainitiative.org

Id:

https://ror.org/0330j0z60

Creators:

Individual:

Robert Wojcikiewicz

Organization:

New Mexico State University

Address:

Plant and Environmental Sciences Department,

Las Cruces, NM 88003-8003 U.S.A.

Individual:

Niall P Hanan

Organization:

New Mexico State University

Address:

Plant and Environmental Sciences Department,

Las Cruces, NM 88003-8003 U.S.A.

Id:

https://orcid.org/0000-0002-9130-5306

Contacts:

Organization:

Jornada Basin LTER/New Mexico State University

Position:

Jornada Basin LTER Information Manager

Address:

P.O. Box 30003, MSC 3JER New Mexico State University,

Las Cruces, NM 88003-8003 USA

Phone:

575-646-1739

Email Address:

jornada.data@nmsu.edu

Web Address:

https://lter.jornada.nmsu.edu/information-management/

Associated Parties:

Individual:

Emily Doss

Organization:

New Mexico State University

Address:

Plant and Environmental Sciences Department,

Las Cruces, NM 88003-8003 U.S.A.

Role:

associate scientist

Metadata Providers:

Organization:

Jornada Basin LTER/New Mexico State University

Position:

Jornada Basin LTER program

Address:

P.O. Box 30003; MSC 3JER New Mexico State University,

Las Cruces, NM 88003-8003 USA

Email Address:

jornada.lter@nmsu.edu

Web Address:

https://lter.jornada.nmsu.edu

Temporal, Geographic and Taxonomic Coverage

Temporal, Geographic and/or Taxonomic information that applies to all data in this dataset:

Time Period

Begin:

2019-08-30

End:

2019-11-04

Geographic Region:

Description:

NPP study locations: There are 15 sites used in the NPP study, spanning 5 vegetation community types in the Jornada Basin. This bounding box includes all 15 sites. More precise geographic coordinates for this study may be requested from the JRN LTER Data Manager (jornada.data@nmsu.edu).

Bounding Coordinates:

Northern:	32.669000	Southern:	32.488000
Western:	-106.865000	Eastern:	-106.713000

Project

Parent Project Information:

Title:

Jornada Basin LTER

Personnel:

Individual:

Dr. Niall Hanan

Address:

P.O. Box 30003, MSC 3JER,

New Mexico State University,

Las Cruces, NM 88003-8003 United States

Phone:

575-646-3335 (voice)

Email Address:

nhanan@nmsu.edu

Role:

Principal Investigator

Abstract:

The Jornada Basin Long-Term Ecological Research (LTER) program is part of a national network of long-term ecological research sites funded by the US National Science Foundation (NSF). The Jornada LTER program has been continuously funded since 1982 to develop general principles governing changes between grassland and shrubland ecosystems based on long-term data collected in the Chihuahuan Desert. We translate our findings to dryland ecosystems around the world, and forecast the dynamics of future ecosystem states in response to changing climate and land use.

Funding:

JRN LTER is funded by the National Science Foundation under award DEB 2025166.

Maintenance

Maintenance:

Description:	completed
Frequency:	asNeeded

Other Metadata

Additional Metadata

additionalMetadata
        |___text '\n    '
        |___element 'metadata'
        |     |___text '\n      '
        |     |___element 'unitList'
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |     |  \___attribute 'abbreviation' = 'º'
        |     |     |     |  \___attribute 'id' = 'degree'
        |     |     |     |  \___attribute 'multiplierToSI' = '0.0174532924'
        |     |     |     |  \___attribute 'name' = 'degree'
        |     |     |     |  \___attribute 'parentSI' = 'radian'
        |     |     |     |  \___attribute 'unitType' = 'angle'
        |     |     |     |___text '\n          '
        |     |     |     |___element 'description'
        |     |     |     |     |___text '360 degrees comprise a unit circle'
        |     |     |     |___text '\n        '
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |     |  \___attribute 'abbreviation' = 'Mpx'
        |     |     |     |  \___attribute 'id' = 'megapixel'
        |     |     |     |  \___attribute 'name' = 'megapixel'
        |     |     |     |  \___attribute 'unitType' = 'dimensionless'
        |     |     |     |___text '\n          '
        |     |     |     |___element 'description'
        |     |     |     |     |___text 'millions of pixels in an image or sensor output'
        |     |     |     |___text '\n        '
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |     |  \___attribute 'abbreviation' = 'm'
        |     |     |     |  \___attribute 'id' = 'meter'
        |     |     |     |  \___attribute 'multiplierToSI' = '1'
        |     |     |     |  \___attribute 'name' = 'meter'
        |     |     |     |  \___attribute 'unitType' = 'length'
        |     |     |     |___text '\n          '
        |     |     |     |___element 'description'
        |     |     |     |     |___text 'SI unit of length'
        |     |     |     |___text '\n        '
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |     |  \___attribute 'abbreviation' = 'mm'
        |     |     |     |  \___attribute 'id' = 'millimeter'
        |     |     |     |  \___attribute 'multiplierToSI' = '0.001'
        |     |     |     |  \___attribute 'name' = 'millimeter'
        |     |     |     |  \___attribute 'parentSI' = 'meter'
        |     |     |     |___text '\n          '
        |     |     |     |___element 'description'
        |     |     |     |     |___text '.001 meters'
        |     |     |     |___text '\n        '
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |     |  \___attribute 'id' = 'number'
        |     |     |     |  \___attribute 'name' = 'number'
        |     |     |     |  \___attribute 'unitType' = 'dimensionless'
        |     |     |     |___text '\n          '
        |     |     |     |___element 'description'
        |     |     |     |     |___text 'a quantity or amount'
        |     |     |     |___text '\n        '
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |     |  \___attribute 'abbreviation' = '%'
        |     |     |     |  \___attribute 'id' = 'percent'
        |     |     |     |  \___attribute 'multiplierToSI' = '1'
        |     |     |     |  \___attribute 'name' = 'percent'
        |     |     |     |  \___attribute 'parentSI' = 'dimensionless'
        |     |     |     |  \___attribute 'unitType' = 'dimensionless'
        |     |     |     |___text '\n          '
        |     |     |     |___element 'description'
        |     |     |     |     |___text 'percent, one part per hundred parts. a decimal ratio multipled by 100'
        |     |     |     |___text '\n        '
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |     |  \___attribute 'abbreviation' = 'px'
        |     |     |     |  \___attribute 'id' = 'pixel'
        |     |     |     |  \___attribute 'name' = 'pixel'
        |     |     |     |  \___attribute 'unitType' = 'dimensionless'
        |     |     |     |___text '\n          '
        |     |     |     |___element 'description'
        |     |     |     |     |___text 'pixels in an image or sensor output'
        |     |     |     |___text '\n        '
        |     |     |___text '\n      '
        |     |___text '\n    '
        |___text '\n  '

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Data Package Metadata View Summary

Sparse point clouds derived from UAV overflights of the fifteen NPP study sites at Jornada Basin LTER in 2019

Data Entities

Data Table

Data Table

Non-Categorized Data Resource

Data Package Usage Rights

Keywords

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

Project outline

Flight and payload information

Image post-processing

Post-processing and file metadata

Related data packages

References

People and Organizations

Temporal, Geographic and Taxonomic Coverage

Project

Parent Project Information:

Maintenance

Additional Metadata

Recently Added

Recently Updated

Data Package Metadata View Summary

Sparse point clouds derived from UAV overflights of the fifteen NPP study sites at Jornada Basin LTER in 2019

+/- Data Entities

Data Table

Data Table

Non-Categorized Data Resource

+/- Data Package Usage Rights

+/- Keywords

+/- Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

Project outline

Flight and payload information

Image post-processing

Post-processing and file metadata

Related data packages

References

+/- People and Organizations

+/- Temporal, Geographic and Taxonomic Coverage

+/- Project

Parent Project Information:

+/- Maintenance

+/- Additional Metadata

Data Entities

Data Package Usage Rights

Keywords

Methods and Protocols

People and Organizations

Temporal, Geographic and Taxonomic Coverage

Project

Maintenance

Additional Metadata