NASA Logo, National Aeronautics and Space Administration
LPVS website banner
small lpv logo

 

The mission of the CEOS Land Product Validation (LPV) subgroup is to coordinate the quantitative validation of satellite-derived products. The focus lies on standardized intercomparison and validation across products from different satellite, algorithms, and agency sources.

The sub-group consists of 10 Focus Areas, with 2/3 co-leads responsible for each land surface variable (essential climate and biodiversity variables).


CEOS VALIDATION HIERARCHY

Validation Stage - Definition and Current State Variable
0
No validation. Product accuracy has not been assessed. Product considered beta.
 
1
Product accuracy is assessed from a small (typically < 30) set of locations and time periods by comparison with in-situ or other suitable reference data.
Snow
Fire Radiative Power
Biomass
2
Product accuracy is estimated over a significant (typically > 30) set of locations and time periods by comparison with reference in situ or other suitable reference data.
Spatial and temporal consistency of the product, and its consistency with similar products, has been evaluated over globally representative locations and time periods.
Results are published in the peer-reviewed literature.
fAPAR
Phenology
Burned Area
Land Cover
LAI
3
Uncertainties in the product and its associated structure are well quantified over a significant (typically > 30) set of locations and time periods representing global conditions by comparison with reference in situ or other suitable reference data. Validation procedures follow community-agreed-upon good practices.
Spatial and temporal consistency of the product, and its consistency with similar products, has been evaluated over globally representative locations and time periods.
Results are published in the peer-reviewed literature.
Vegetation Indicies
Albedo
Soil Moisture
LST & Emissivity
Active Fire
4
Validation results for stage 3 are systematically updated when new product versions are released or as the interannual time series expands.
When appropriate for the product, uncertainties in the product are quantified using fiducial reference measurements over a global network of sites and time periods (if available).

VALIDATION FRAMEWORK

validation Framework figure

To reach validation stage 4, LPV has developed a framework for product intercomparison and validation. This framework is based on a citable protocol, fiducial reference data, and automated subsetting. Ideally, each of these parts will be integrated into an online platform where quantitative tests are run, and standardized intercomparison and validation results reported for all products used in the validation exercise. The goal is to implement this framework for each product variable. Information on variable-specific status of the implementation is available through the focus area pages.

LPV is currently in the process of selecting supersites with fully characterized land surface and vegetation cover for the parameterization of 3D radiative transfer models. These sites will serve as testbeds for in situ sampling strategies and product algorithm intercomparison.

Outreach activities of LPV include distribution of validation news through focus area email lists (see subscription menu in the left panel of this page) and regularly organized validation sessions at conferences, such as AGU and EGU (see announcements panel at top left).

LPV follows international terminology standards for the evaluation of measurement data

LPV Focus Areas


Subscribe!

LPV Focus Area mailing lists. Choose from the focus area pull-down menu.


   

How to use these mailing lists...


Announcing...

6th Sentinel-3 Validation Virtual Team Meeting (S3VT), December 15-17, 2020, EUMETSAT HQ.

Supersites and Biomass Validation Workshop, March 2nd - 6th, 2020, Canberra, Australia.

Call for papers. RSE special issue on the Terra Mission – 20 Years of Science Abstract Deadline: Jan 31, 2020.

AGU Fall Meeting, December 1-17, 2020.

2020 MODIS/VIIRS Science Team Meeting. June 2020


CEOS Related Sites

CEOS
The Committee on Earth Observation Satellites
CEOS WGCV
The CEOS Working Group on Calibration and Validation
CEOS Cal/Val Portal
ESA-Sponsored Cal/Val Portal
NASA Logo - nasa.gov