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Tree cover mapping using hybrid fuzzy C-means method and multispectral satellite images / Linda Gulbe in Baltic forestry, vol 25 n° 1 (2019)  

Public [article]  inBaltic forestry > vol 25 n° 1 (2019) . - pp 113 - 123 Titre : Tree cover mapping using hybrid fuzzy C-means method and multispectral satellite images Type de document : Article/Communication Auteurs : Linda Gulbe, Auteur ; Aleksandrs Kozlovs, Auteur ; Janis Donis, Auteur ; Agris Tradkovs, Auteur Année de publication : 2019 Article en page(s) : pp 113 - 123 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes descripteurs IGN] carte de la végétation [Termes descripteurs IGN] classification barycentrique [Termes descripteurs IGN] classification floue [Termes descripteurs IGN] estimation statistique [Termes descripteurs IGN] image Landsat-8 [Termes descripteurs IGN] image Landsat-ETM+ [Termes descripteurs IGN] image Landsat-OLI [Termes descripteurs IGN] image Landsat-TM [Termes descripteurs IGN] image multibande [Termes descripteurs IGN] image Sentinel-MSI [Termes descripteurs IGN] inventaire forestier (techniques et méthodes) [Termes descripteurs IGN] inventaire forestier étranger (données) [Termes descripteurs IGN] Lettonie Résumé : (auteur) Countrywide up-to-date tree cover maps provide valuable information for planning and management purposes to investigate location of the resources and to identify afforestation and deforestation patterns. Landsat programme offers freely available satellite data with time span more than three decades and it can serve as bases for tree cover map calculation using satellite image classification; however, practical use of classification methods is limited due to lack of user-friendly solutions and complex interpretation of the results. The objective of this study is to evaluate user-friendly hybrid classification scheme for tree cover mapping in Latvia and to explore the nature of the spectral classes and consistency of the results when methodology is applied to images of different dates. Tree cover in this context means the area covered by crown of the tree, which may or may not be considered as forest according to local provisions. Tree cover is estimated using unsupervised fuzzy c-means methods with the stability check to ensure the presence of the same spectral classes in independent tests. Spectral classes are classified into two categories: tree cover and other by employing k-nearest neighbours. Such approach does not require high quality sample data and does not include user defined internal parameters of the algorithms (however, they can be specified if needed). The best overall accuracy achieved for year 2014 was 94.2% with producer's accuracy 98.7% (tree cover), 90.5% (other land cover), user's accuracy 90.0% (tree cover), 98.8% (other land cover) and kappa 0.89. Consistency studies showed high impact (within 10% of overall accuracy) of unique conditions during the image acquisition. Some of the spectral classes represent borderline case between relatively dense tree cover and other land cover types like sparse young stands. Those cases are the main threat to the consistency between the results of different dates and seasons. Numéro de notice : A2019-375 Thématique : FORET Nature : Article DOI : sans En ligne : https://www.balticforestry.mi.lt/bf/PDF_Articles/2019-25%5B1%5D/Baltic%20Forestr [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93417 [article]

Validation of medium-scale historical maps of southern Latvia for evaluation of impact of continuous forest cover on the present-day mean stand area and tree species richness / Anda Fescenko in Baltic forestry, vol 22 n° 1 ([01/02/2016])  

Public [article]  inBaltic forestry > vol 22 n° 1 [01/02/2016] . - pp 51 - 62 Titre : Validation of medium-scale historical maps of southern Latvia for evaluation of impact of continuous forest cover on the present-day mean stand area and tree species richness Type de document : Article/Communication Auteurs : Anda Fescenko, Auteur ; Martins Lukins, Auteur ; Ilja Fescenko, Auteur Année de publication : 2016 Article en page(s) : pp 51 - 62 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes descripteurs IGN] analyse multivariée [Termes descripteurs IGN] carte ancienne [Termes descripteurs IGN] continuité géographique [Termes descripteurs IGN] couvert forestier [Termes descripteurs IGN] données multitemporelles [Termes descripteurs IGN] écosystème forestier [Termes descripteurs IGN] feuillu [Termes descripteurs IGN] inventaire forestier étranger (données) [Termes descripteurs IGN] Lettonie [Termes descripteurs IGN] régression [Termes descripteurs IGN] richesse floristique [Termes descripteurs IGN] station forestière [Termes descripteurs IGN] utilisation du sol Résumé : (auteur) Medium-scale historical maps are often the only cartographic source of former forest area distribution on a regional level. In conjunction with a database of the current distribution of species or functional traits, maps may be valuable tool for studying the impact of previous land use on ecosystems. In this study a heterogeneous set of historical maps was used to reconstruct the multi-temporal pattern of the forest area in a moderately forested region (5,180 km2) of southern Latvia during the last 220 years. Changes in the total forest cover were assessed in four time slices and compared with available historical statistical data. To validate the obtained multi-temporal data for ecological studies, the impact of continuous forest cover on the present-day mean stand area and tree species richness derived from the present-day forest inventory database of 94,886 stands was quantified by bivariate and regression analyses. We found no significant impact of inaccuracy of the historical maps on the entire forest continuity pattern of the study area. In particular, the diversity metrics dependencies on the forest continuity can be described by quadratic regression models with coefficients of determination close to one. We also found that the mean stand area is for about 18% larger in woodlands with longer forest continuity irrespective of the forest type. The older woodland the less difference was found between boreal deciduous and nemoral deciduous forests in terms of tree species richness. Numéro de notice : A2016--096 Thématique : FORET/GEOMATIQUE Nature : Article En ligne : https://www.balticforestry.mi.lt/bf/PDF_Articles/2016-22%5b1%5d/e-Baltic%20Fores [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84649 [article]

State Land Service: Pillar under Latvia's E-government / Frédérique Coumans in GIM international [en ligne], vol 29 n° 10 (October 2015)

Public [article]  inGIM international [en ligne] > vol 29 n° 10 (October 2015) . - pp 31 - 33 Titre : State Land Service: Pillar under Latvia's E-government Type de document : Article/Communication Auteurs : Frédérique Coumans, Auteur Année de publication : 2015 Article en page(s) : pp 31 - 33 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cadastre étranger [Termes descripteurs IGN] cadastre étranger [Termes descripteurs IGN] cadastre numérique [Termes descripteurs IGN] infrastructure nationale des données localisées [Termes descripteurs IGN] Lettonie Résumé : (auteur) After the decline of the Soviet period, Latvia regained its independence and reformed the ownership situation in the country. Over a period of less than 25 years, the public and private land parcels and buildings were recorded in the cadastre information system of the State Land Service (SLS). SLS maintains other highly valued databases and is responsible for a growing part of the national spatial data infrastructure and Latvian e-government. Numéro de notice : a2015-663 Thématique : GEOMATIQUE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78271 [article]

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Les industries baltes du bois en plein essor / Al Arter in Le Bois International : l'officiel du bois [édition verte], vol 2008 n° 17 (3 et 10 mai 2008)

Public [article]  inLe Bois International : l'officiel du bois [édition verte] > vol 2008 n° 17 (3 et 10 mai 2008) . - p. 47-50 Titre : Les industries baltes du bois en plein essor Type de document : Article/Communication Auteurs : Al Arter, Auteur Année de publication : 2008 Article en page(s) : p. 47-50 Langues : Français (fre) Descripteur : [Termes descripteurs IGN] Estonie [Termes descripteurs IGN] industrie forestière [Termes descripteurs IGN] Lettonie Numéro de notice : IFN_3684 Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72323 [article]

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Geographic information and the enlargement of the European Union / Massimo Craglia (2001)

Public Titre : Geographic information and the enlargement of the European Union : EUROGI - European Commission workshop technical report, Brussels, 16-17 November 2000 Type de document : Actes de congrès Auteurs : Massimo Craglia, Editeur scientifique ; Jean-François Dallemand, Editeur scientifique ; Space applications institute, Auteur ; Joint research centre = Centre commun de recherche (Ispra, Italie), Auteur ; European commission, Auteur ; Eurogi, Auteur Congrès : EUROGI 2000, Geographic information and the enlargement of the European Union (16 - 17 novembre 2000; Bruxelles, Belgique), Auteur Editeur : Bruxelles : Commission Européenne = European Commission Année de publication : 2001 Importance : 99 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Infrastructure de données [Termes descripteurs IGN] Bulgarie [Termes descripteurs IGN] Chypre [Termes descripteurs IGN] Estonie [Termes descripteurs IGN] Europe (géographie politique) [Termes descripteurs IGN] Hongrie [Termes descripteurs IGN] information géographique [Termes descripteurs IGN] infrastructure européenne de données localisées [Termes descripteurs IGN] Lettonie [Termes descripteurs IGN] Lituanie [Termes descripteurs IGN] Malte [Termes descripteurs IGN] Pologne [Termes descripteurs IGN] République Tchèque [Termes descripteurs IGN] Roumanie [Termes descripteurs IGN] Slovaquie [Termes descripteurs IGN] Slovénie [Termes descripteurs IGN] Union Européenne Résumé : (Auteur) In twenty years time there may be more than twenty five countries in the European Union. The enlargement of the present Union on this scale has massive implications for the structure of decision making at the European level as well as for the management of key elements of its infrastructure such as geographic information. The five strategic objectives of EUROGI (the European Umbrella Organisation for Geographic Information) include the promotion of strong national GI associations throughout Europe and the improvement of the European Geographic Information Infrastructure. These are of particular importance for capacity building and data policy formulation in those central and eastern European countries that are seeking to become members of an enlarged European Union. With these considerations in mind EUROGI welcomed the opportunity to cooperate with the Joint Research Centre in organising a workshop on this topic in Brussels from November 17th - 18th 2000. This report is the outcome of this workshop. It is being disseminated widely among the various member associations that make up EUROGI to stimulate further discussion on these topics at both the national and European levels. 1 would like to express my appreciation to Anton Wolfkamp, and Karen Levoleger in the EUROGI Secretariat for their enthusiastic responses to the challenges posed by organising this workshop. Note de contenu : 1. Introduction Background and Structure The Enlargement of the European Union The Potential Role of Geographic Information Structure of the Country Profiles 2. Country Profiles Bulgary Cyprus Czech Republic Estonia Hungary Latvia Lithuania Malta Poland Romania Slovakia Slovenia 3. Comparison and Evaluation General comparison Country "Thumbnails" Thematic comparison 4. Conclusions Numéro de notice : 11972 Thématique : GEOMATIQUE Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34584

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Latvian geoid determination with mass point frequency domain inversion / K. Kukums (1993)

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Die Bestimmung des Richtungsvektors Riga-Sofia aus Beobachtungen des Satelliten "Echo 2" / K. Arnold (1971)

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Rapport de la commission permanente de phototopographie aérienne préparé pour le congrès international de géographie, Varsovie, 1934 / Commission permanente de phototopographie (1934)

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