Hannu Saarenmaa

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1996. LIGNUM: a tree model based on simple structural units. Annals of Botany, volume 77, number 1, pages 87-98. The model LIGNUM treats a tree as a collection of a large number of simple units which correspond to the organs of the tree. The model describes the three dimensional structure of the tree crown and defines the growth in terms of the metabolism(More)
Stefano Nativi⁎, Paolo Mazzetti, Hannu Saarenmaa, Jeremy Kerr, Éamonn Ó Tuama a Italian National Research Council (CNR)-IMAA, C.da S. Loja, Zona industriale-Tito Scalo, 85050 Italy Finnish Museum of Natural History, 00014 University of Helsinki, Finland Canadian Facility for Ecoinformatics Research, Department of Biology, University of Ottawa, Box 450,(More)
BACKGROUND The scientific names of plants and animals play a major role in Life Sciences as information is indexed, integrated, and searched using scientific names. The main problem with names is their ambiguous nature, because more than one name may point to the same taxon and multiple taxa may share the same name. In addition, scientific names change over(More)
Much biodiversity data is collected worldwide, but it remains challenging to assemble the scattered knowledge for assessing biodiversity status and trends. The concept of Essential Biodiversity Variables (EBVs) was introduced to structure biodiversity monitoring globally, and to harmonize and standardize biodiversity data from disparate sources to capture a(More)
This paper analyzes the problems of working with large, mixed-origin taxonomic databases.<lb>The analyses were based in an example of a database that included more than 50 000<lb>specimens of Papilionidae and Pieridae butterflies of Mexico, obtained from ca. twenty<lb>different museums. The major problems and errors present in this database were classified(More)
The Group on Earth Observations Biodiversity Observation Network (GEO BON) has been in formal existence for three years, following several years of design and discussion. It is the realisation of the biodiversity societal benefit area envisaged in the GEO System of Systems (GEOSS). GEO BON links together existing networks, each covering particular aspects(More)
BACKGROUND Reliable taxonomy underpins communication in all of biology, not least nature conservation and sustainable use of ecosystem resources. The flexibility of taxonomic interpretations, however, presents a serious challenge for end-users of taxonomic concepts. Users need standardised and continuously harmonised taxonomic reference systems, as well as(More)
Key global indicators of biodiversity decline, such as the IUCN Red List Index and the Living Planet Index, have relatively long assessment intervals. This means they, due to their inherent structure, function as late-warning indicators that are retrospective, rather than prospective. These indicators are unquestionably important in providing information(More)
Digitarium is a joint initiative of the Finnish Museum of Natural History and the University of Eastern Finland. It was established in 2010 as a dedicated shop for the large-scale digitisation of natural history collections. Digitarium offers service packages based on the digitisation process, including tagging, imaging, data entry, georeferencing,(More)