Lars Erikstad

Norwegian Institute for Nature Research

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Vegar Bakkestuen

Norwegian Institute for Nature Research

Trine Bekkby

Norwegian Institute for Water Research

Rune Halvorsen

University of Oslo

Dagmar Hagen

Norwegian Institute for Nature Research

Trond Simensen

Norwegian Institute for Nature Research

Eli Rinde

Norwegian Institute for Water Research

Gro B. Jerpåsen

Norwegian Institute for Cultural Heritage Research

Arnt-Børre Salberg

Norwegian Computing Center

Hans Arne Nakrem

University of Oslo

Oddvar Longva

Norwegian Geological Survey

Cooperative Institutions

Norwegian Institute for Nature Research

University of Oslo

Norwegian Geological Survey

Norwegian Institute for Cultural Heritage Research

Norwegian Computing Center

Natural History Museum

Norwegian University of Science and Technology

American Museum of Natural History

Norwegian University of Life Sciences

Norwegian Institute of Marine Research

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Protected Geosites in an Urban Area of Norway, Inventories, Values, and Management

Geoheritage (2017)

Lars Erikstad Hans Arne Nakrem J. A. Markussen

Historical geology

10.1007/s12371-017-0223-6

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Citations (17)

VALORACIÓN DEL PATRIMONIO GEOLÓGICO EN EUROPA

Boletim Paranaense de Geociências (2013)

Luis Carcavilla Urquí Enrique Dı́az-Martı́nez Lars Erikstad Ángel García‐Cortés

Los orígenes del estudio del patrimonio geológico en Europa se sitúan en la segunda mitad del siglo XX, si bien mucho antes ya se habían puesto en marcha iniciativas para la protección de enclaves singulares de interés estético. Desde entonces, cada una de las 50 naciones europeas ha diseñado distintas estrategias y mecanismos para el estudio y conservación del patrimonio geológico, con diferente grado de desarrollo y avance. Este ha dependido generalmente de la iniciativa de los geocientíficos pero también del interés mostrado por las administraciones competentes en conservación del patrimonio natural, de manera que, aunque cada país tiene su problemática particular, hay muchas situaciones comunes. Algunos programas globales promovidos desde Europa, como la Red Global de Geoparques y Global Geosites, han impulsado el inventario y divulgación del patrimonio geológico, si bien a día de hoy no existe una directiva europea que promueva la conservación del patrimonio geológico, lo que sin duda impulsaría definitivamente la geoconservación en todos lo estados. Algunos países pueden servir de ejemplo al destacar en la elaboración de inventarios nacionales, en la legislación o en el diseño de metodologías para la geoconservación, pero en términos generales, el patrimonio geológico en Europa siempre ha ido a remolque de las iniciativas de conservación de la biodiversidad y que aún queda mucho camino por recorrer para desarrollar sistemas de valoración y estrategias de geoconservación en todos los países.

10.5380/geo.v70i0.31501

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Citations (10)

Research resource review

Progress in Physical Geography Earth and Environment (2014)

Lars Erikstad

10.1177/0309133314536112

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Fusion of satellite and aerial images for identification and modeling of nature types

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2013)

Arnt B. Salberg Lars Erikstad Maciel Zortea

In this paper we propose a framework for fusion of very high resolution (VHR) optical aerial images, satellite images (optical or SAR) and other ancillary data (e.g. a digital elevation model) for identification and modeling of nature types typically present in mountain vegetation in Arctic alpine areas. The data fusion methodology consists of three steps. (i) Segmentation of VHR aerial photo into spectrally homogeneous regions (polygons). (ii) Estimation of complementary information for each polygon using geo-referenced data from other sources. (iii) Analysis of the constructed feature vectors. We also demonstrated the strength of satellite data by qualitatively evaluating the potential for creating high resolution snow cover maps. These maps may be used to describe important environmental variables. Using a set of data consisting of an aerial photo, two SPOT 5 images and a Radarsat-2 quad-pol image, we demonstrated the potential of the data fusion methodology by an example where the polygon-derived features were analysed using PCA.

Aerial image

Polygon (computer graphics)

Sensor Fusion

Identification

Data set

10.1117/12.2029003

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Citations (1)

Registration and conservation of sites and areas with geological significance in Norway

Norsk Geografisk Tidsskrift - Norwegian Journal of Geography (1984)

Lars Erikstad

Abstract The first Norwegian law concerning nature conservation (1910) established the importance of geological considerations in nature protection. The number of protected areas was low for a considerable time, but systematic work in this field the last 10–15 years has resulted in a significant increase. Today the main conservation work is done regionally on a county by county basis. This work requires a regional overview of the different natural types in question. At present around 700 sites and areas are protected. Geological areas, however, represent a small fraction of the total number, but the systematic registration work is making good progress. Quaternary geology is given priority together with fossils and mineral localities. In addition, registration of valuable karst areas in the county of Nordland is carried out.

Norwegian

10.1080/00291958408552127

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Citations (8)

Neoglaciation in South Norway using lichenometric methods

Norsk Geografisk Tidsskrift - Norwegian Journal of Geography (1986)

Lars Erikstad Johan Ludvig Sollid

The neoglacial history of South Norway is illuminated through a lichenometric study of 14 ice-marginal zones of glaciers situated along a right angled line running north-south and west-east to cover a vast area. Maps of the marginal zones two lichen growth curves, the moraine dates and a frequency diagram are presented on a plate, PI. 1. If there are reference points to check the growth curves, lichenometry is found to be reliable to fix the time of deglaciation of the moraine ridges within a period of about three hundred years. A total of 101 moraine ridges were dated and the results show that their deglaciation time is concentrated around 1930, 1905, 1900, 1880, 1860, 1840, 1820 and 1800. The deglaciation of the outermost moraines is concentrated within the period 1780–1820.

Deglaciation

10.1080/00291958608552159

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Citations (107)

Arealrepresentativ overvåking basert på fjernanalyse. Flyfototolkning i fjell og myrnatur

44 (2011)

Lars Erikstad Geir‐Harald Strand Frode Bentzen Arnt-Børre Salberg

Source

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Recent changes in the landscápe of the marine clays, Østfold, southeast Norway

Norsk Geografisk Tidsskrift - Norwegian Journal of Geography (1992)

Lars Erikstad

Abstract Grading of gullies for agricultural purposes was heavily subsidized in Norway during the period 1971–1987. Grading activity was very high and has significantly contributed to the recent changes in the rural landscape of Østfold. Interpretation of aerial photographs indicated that at least one-third of the marine clay areas contained significant grading and similar encroachments. Detailed studies of three test areas revealed that between 60 and 80% of the total length of the observed gullies from the 1950s and 1960s had disappeared. Today it is almost impossible to find large intact gully systems that are not affected by grading. The few gully systems which are still reasonably untouched have therefore a high conservation value.

Grading (engineering)

10.1080/00291959208552279

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Citations (9)

Environmental value assessment in a multidisciplinary EIA setting

Environmental Impact Assessment Review (2007)

Lars Erikstad Inge Lindblom Gro B. Jerpåsen Martin A. Hanssen Trine Bekkby

Value (mathematics)

10.1016/j.eiar.2007.03.005

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Citations (50)

Locating archaeological sites in the landscape: a hierarchical approach based on landscape indicators