Browsing by Subject "satelliittikuvat"

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  • Poso, Simo; Häme, Tuomas; Paananen, Raito (Suomen metsätieteellinen seura, 1984)
  • Varjo, Jari (The Finnish Society of Forest Science and The Finnish Forest Research Institute, 1997)
    A method was developed for relative radiometric calibration of single multitemporal Landsat TM image, several multitemporal images covering each others, and several multitemporal images covering different geographic locations. The radiometricly calibrated difference images were used for detecting rapid changes on forest stands. The nonparametric Kernel method was applied for change detection. The accuracy of the change detection was estimated by inspecting the image analysis results in field. The change classification was applied for controlling the quality of the continuously updated forest stand information. The aim was to ensure that all the manmade changes and any forest damages were correctly updated including the attribute and stand delineation information. The image analysis results were compared with the registered treatments and the stand information base. The stands with discrepancies between these two information sources were recommended to be field inspected.
  • Poso, Simo; Paananen, Raito; Similä, Markku (Suomen metsätieteellinen seura, 1987)
  • Lyytimäki, Jari (International Journal of Sustainable Lighting, 2020)
    International Journal of Sustainable Lighting
    Advances in remote sensing have proved to be highly valuable for the light pollution research and awareness raising. Maps based on night time satellite data can be used in communication campaigns aimed to improve the public and policy awareness about the extent and effects of light pollution and to justify appropriate management actions. However, visually appealing maps are also used in other communication settings. This article reviews different uses of light pollution maps and discusses the societal implications such uses. Based on examples of light pollution maps in different communication settings not directly related to light pollution debate the review proposes that the relatively wide popularity of light pollution maps may strengthen the impressions of artificially illuminated night environment as the normal baseline for human experience. This contributes to the loss of experience of the natural darkness possibly leading to generational amnesia complicating the management of light pollution. Multiple uses of light pollution maps and other visualizations should be taken into account when campaigns and policies aimed to support sustainable lighting are planned and implemented.
  • Peng, Shikui (Suomen metsätieteellinen seura, 1987)
    A study of a 194.3 ha area of forest land dominated by Norway spruce and Scots pine in central S. Finland. A general procedure is presented and discussed for integrating data from permanent sample plots and from satellite images for continuous forest inventory of large areas and for compartment estimations. Methods for estimation, updating and statistical analysis are examined.