Dataset Edition
| Présentation générale | |||
|---|---|---|---|
| Nom du jeu de données | Visible Sky, indirect and direct insolation and Leaf Area Index (LAI) of the tree layer of seven dominant vegetation types (IMPETUS dataset ID = 289) | ||
| Créé le | 2004-02-10 | ||
| Projet(s) | IMPETUS | ||
| Date de début (yyyy-mm-dd) | 2002-03-01 | Date de fin (yyyy-mm-dd) | 2002-10-30 |
| Contact(s) | |||
| Accès aux données |  Dataset as provided by the Principal Investigator | ||
| Description du jeu de données | |||
| Résumé | Visible Sky, indirect and direct insolation are parameters derived from hemispherical photographs, which were taken with the HemiView System (Delta-T Devices, Ltd., UK) in 1.3m above the ground - above the herbaceous layer. Thus all values refer to the tree layer and do not represent total vegetation cover. Visible sky (VS) gives the overall proportion of the sky hemisphere that is visible. The global site factor (GSF) is calculated as the ratio of total radiation below the canopy to total radiation above the canopy. Likewise, indirect site factor (ISF) and direct site factor (DSF) are calculated using indirect and direct radiation below and above the canopy, respectively. HemiView algorithms estimate leaf area index (LAI) as half of the total leaf area per unit ground area, what is a rough approximation. For information on the vegetation types see section "related Datasets" below. Parameter, Attribute list: leaf area index (LAI), visible sky, global site factor, indirect site factor, direct site factor. Dataset created by IMPETUS subproject A3. No information about Data Lineage; No information about Data Consistency; No information about Data Completeness; Positional Accuracy: Position is measured by a GPS; No information about Quantitative Attribute Accuracy | ||
| Strategie d'observation | collection of relevant abiotic parameters in order to characterize the seven dominant vegetation types and to analyse the relationship between these parameters and the herbaceous layer and the regeneration of tree species. All parameter are strongly related to tree cover and therefore appropriate to serve for meteorological, hydrological or remote sensing analyses and modelling approaches. | ||
| Description de l'instrument | |||
| No information available | |||
| Information géographique | |||
| Site 1 | |||
| Mot-clé de localistion | CONTINENT > AFRICA > WESTERN AFRICA > BENIN | ||
| Site | Aguima Catchment | ||
| Longitude minimale (°) | 1.9124 | Longitude maximale (°) | 1.9621 |
| Latitude maximale (°) | 9.1342 | Latitude minimale (°) | 9.1061 |
| Site 2 | |||
| Mot-clé de localistion | CONTINENT > AFRICA > WESTERN AFRICA > BENIN | ||
| Site | Doguè | ||
| Site 3 | |||
| Site | IMPETUS_289 | ||
| Longitude minimale (°) | 1.9012 | Longitude maximale (°) | 1.9175 |
| Latitude maximale (°) | 9.1432 | Latitude minimale (°) | 9.123 |
| Paramètres mesurés | |||
| Paramètre mesuré 1 | |||
| Nom du paramètre | vegetation classification | ||
| Mot-clé du paramètre | Biosphere > Vegetation | ||
| Unité | |||
| Date de début (yyyy-mm-dd) | Date de fin (yyyy-mm-dd) | ||
| Précision du capteur / Incertitude | |||
| Paramètre mesuré 2 | |||
| Nom du paramètre | vegetation | ||
| Mot-clé du paramètre | Biosphere > Vegetation | ||
| Unité | |||
| Date de début (yyyy-mm-dd) | Date de fin (yyyy-mm-dd) | ||
| Précision du capteur / Incertitude | |||
| Paramètre mesuré 3 | |||
| Nom du paramètre | leaf area index | ||
| Mot-clé du paramètre | Biosphere > Vegetation > Vegetation Index | ||
| Unité | |||
| Date de début (yyyy-mm-dd) | Date de fin (yyyy-mm-dd) | ||
| Précision du capteur / Incertitude | |||
| Information sur l'utilisation des données | |||
| Conditions d'utilisation des données | Please inform the Point of Contact if you use the data for publication | ||
| Charte d'accès aux données | IMPETUS data policy | ||
| Base de données | IMPETUS | ||
| Format des fichiers de données | Excel | ||
