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LPV LAI Intercomparison Study

Use the table below to go to LAI Intercomparison data access for a particular site.

The CEOS Land Product Validation subgroup identified a set of sites over which they are focusing LAI Intercomparison activities. These sites are indicated in the map below. Many of the sites listed are intercomparison sites used in the overview paper for the IEEE TGARS Special Issue on Land Product Validation, Validation of global moderate resolution LAI Products: a framework proposed within the CEOS Land Product Validation subgroup. View or download this paper here.

This study investigated the performance of four major global LAI products at 1/11.2° spatial sampling and a monthly time step:

  • ECOCLIMAP climatology
  • GLOBCARBON (from SPOT/VEGETATION and ATSR/AATSR)
  • CYCLOPES (from SPOT/VEGETATION)
  • MODIS Collection 4 (main algorithm - from MODIS/TERRA)

These products were intercompared during the 2001-2003 period over the BELMANIP network of sites. Their uncertainties were assessed by comparison with 56 LAI high resolution reference maps derived from ground measurements. In this analysis we found that CYCLOPES and MODIS depict realistic spatial variations at continental scale, while ECOCLIMAP poorly captures surface spatial heterogeneity, and GLOBCARBON tends to display erratic variations. ECOCLIMAP and GLOBCARBON show the highest frequency of successful retrievals, while MODIS and CYCLOPES data are frequently missing in winter over mid and Northern latitudes. CYCLOPES and MODIS have consistent temporal profiles over most vegetation types, while ECOCLIMAP does not show any interannual variation, and GLOBCARBON can exhibit temporal instability during the growing season over forests. The CYCLOPES, MODIS, and GLOBCARBON LAI values agree better over croplands and grasslands than over forests, where differences in vegetation structure between algorithms and surface reflectance uncertainties leads to substantial discrepancies between products. CYCLOPES does not reach high enough LAI to properly characterize forests. In contrast, the other products have sufficient dynamic range in LAI to describe the global variability. Overall, the CYCLOPES product is the most similar to the LAI reference maps. However, more accurate ground measurements and better representation of the global and seasonal variability of vegetation are required to refine this result.

Details about the files provided via the links below are described in more detail via the readme and the associated LAI data spreadsheet that the readme refers to. Be sure to download these as well if you access any of the data provided below.


Click on the site name in the table below to go to the directory where intercomparison data are stored.

 MODIS image provided by The Blue Marble.

*Please Note**
If any of the data provided below are used in a publication, please include in the acknowledgment section:
We thank the CEOS LPV group for providing ground validation data on their Web site (http://lpvs.gsfc.nasa.gov/LPV_LAI10km.html).

Please also cite:
Garrigues, S., Lacaze, R., Baret, F., Morisette, J., Weiss, M., Nickeson, J., Fernandes, R., Plummer, S., Shabanov, N.V., Myneni, R. et al., 2008. Validation and Intercomparison of Global Leaf Area Index Products Derived From Remote Sensing Data. Journal of Geophysical Research, 113 (G02028).
 Site Name
Other Name or multiple sites/dates
Land Cover
Country
 Aek Loba
 
mixed evergreen forest
Sumatra
 Alpilles
2 Sites
cropland/agriculture
France
 Appommattox
Albemarle
needleleaf forest
USA
 Barrax
 
cropland/agriculture
Spain
 Barrow
Tundra
grass
USA
 Camerons
 
evergreen broadleaf forest
Australia
 Metolius
Cascades 
needleleaf forest 
USA
 Chamela
2 Sites
basal tropical dry forest 
Mexico
 Chateauguay
4 Sites
 mixed forest
Canada
 Chequamagon
Park Falls
 mixed forest
USA
 Concepcion
 
 evergreen needleleaf forest
Chile
 Counami
 
evergreen broadleaf forest 
French Guyana
 Flakaliden
 
 evergreen needleleaf forest
Sweden
 Fundulea
 
cropland 
Romania
 Gilching
 
cropland 
Germany
 Gourma
 
grass
Mali
 Haouz
 
cropland 
Morocco
 Harvard Forest
 
mixed forest 
USA
 Hirsikangas
 
 evergreen needleleaf fores
Finland
 Jarvselja
 
mixed forest  
Estonia
 Kejimikujik
2 Sites
mixed forest  
Canada
 Konza
 
grass
USA
 Laprida
 
 grass
Argentina
 Larose
 
 mixed forest 
Canada
 Larzac
 
 grass
France
 Los Inocentes
Guancaste
 evergreen broadleaf forest
Costa Rica
 Nezer
 
evergreen needleleaf forest 
France
 NOBS/BOREAS
Thompson (4)
 evergreen needleleaf forest 
Canada
 Puechebon
 
 mixed forest
France
 Rovanemi
 
 evergreen needleleaf forest 
Finland
 Ruokolahti
 
 evergreen needleleaf forest 
Finland
 Sevilleta
 
grass 
USA
 Sonian Forest
 
mixed forest 
Belgium
 Sud-Ouest
 
 evergreen needleleaf forest 
France
 SW Ontario
15 Sites
 mixed forest
Canada
 Tapajos
Santarem
 evergreen broadleaf forest 
Brazil
 Turco
 
grass 
Bolivia
 Walnut Creek
 
 crop
USA
 Watson Lake
 
 mixed forest
Canada


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Curator: Jaime Nickeson
NASA Official: Miguel Román
Last Updated: April 30, 2014
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