scholarly journals Semi-automatic classification of tree species in different forest ecosystems by spectral and geometric variables derived from Airborne Digital Sensor (ADS40) and RC30 data

2011 ◽  
Vol 115 (1) ◽  
pp. 76-85 ◽  
Author(s):  
L.T. Waser ◽  
C. Ginzler ◽  
M. Kuechler ◽  
E. Baltsavias ◽  
L. Hurni
Author(s):  
Д.М. Черниховский

Целью статьи является поиск взаимосвязей между количественными и качественными характеристиками лесов и морфометрическими характеристиками рельефа. На примере Лисинской части Учебно-опытного лесничества Ленинградской области оценивались регрессионные взаимосвязи между характеристиками лесов и результатами автоматической классификации рельефа. Актуальность данного направления связана с поиском объективных количественных характеристик ландшафтов, способных определять изменчивость характеристик структуры и продуктивности лесов. Сформирован геоинформационный проект модельной территории, разбитый регулярной сеткой с шагом 1000 м на 205 ячеек. Для ячеек регулярной сети определены обобщенные характеристики лесов на основе материалов таксации. В качестве анализируемых характеристик лесов рассматривались доли площади земель, покрытых лесной растительностью; доли площади, занимаемые насаждениями преобладающих древесных пород и группами типов леса, средние запасы на га, средние классы бонитета. На основе цифровой модели рельефа SRTM выполнены четыре варианта автоматической классификации поверхности рельефа методом Ивахаши и Пайка и методом, основанным на анализе индекса превышения (TPI). Взаимосвязи количественных и качественных характеристик лесов с характеристиками поверхности рельефа (классами рельефа) оценивались средствами многофакторного регрессионного анализа. Для каждого варианта автоматической классификации рельефа определен набор из 3–4 некоррелированных между собой классов форм рельефа, способных объяснять изменчивость большинства анализируемых количественных и качественных характеристик лесов. Многофакторные уравнения для разных вариантов классификации демонстрируют аналогичные по силе статистические связи для одних и тех же характеристик лесов (средних запасов и бонитетов, долей площади преобладающих пород и групп типов леса). Дальнейшее развитие результатов исследования может способствовать совершенствованию теории и практики лесоучетных работ на основе количественного анализа пространственных данных о лесных ландшафтах с применением геоинформационных технологий и дистанционных методов. The aim of the article is a search the relationships between the quantitative and qualitative characteristics of forests and morphometric characteristics of the relief. On example of the Lisino part of Uchebno-Opytnoe forest district in Leningrad region were estimated regression relationships between the characteristics of the forest stands and the results of automatic classifications of relief. The urgency of this direction is associated with the search for objective quantitative characteristics of landscapes, that can determine the variability of the characteristics of the structure and productivity of forests. The geoinformation project of model territory was formed and was divided to 205 cells on base of regular grid with step 1000 m. For cells of regular grid were determined generalized characteristics of forests on base of forest mensuration data. As analyzed characteristics of forests were considered the proportion of land area covered by forest vegetation, the proportion of the area occupied by predominant tree species and groups of forest types, average stocks per hectare, the average productivity classes. On base of digital terrain model SRTM were executed four variants for the automatic classification of surface topography by Iwahashi and Pike method, and a method based on the analysis of topographic position index (TPI). The relationships between quantitative and qualitative characteristics of forests with the characteristics of the surface topography (classes of relief) were evaluated by means of multivariate regression analysis. For each variant the automatic classification of the relief was determined a set of 3–4 classes uncorrelated with each other landforms that could explain the variability of the majority of analyzed quantitative and qualitative characteristics of forests. Multivariate equations for the different variants of the classification demonstrates similar statistics in strength due to the same characteristics of forests (average stocks and classes of productivity, shares of area predominate tree species and groups of forest types). The future development of research results can help to improving the theory and practice of forest accounting works based on the quantitative analysis of spatial data on forest landscapes using GIS and remote sensing methods.


Author(s):  
Paul DeCosta ◽  
Kyugon Cho ◽  
Stephen Shemlon ◽  
Heesung Jun ◽  
Stanley M. Dunn

Introduction: The analysis and interpretation of electron micrographs of cells and tissues, often requires the accurate extraction of structural networks, which either provide immediate 2D or 3D information, or from which the desired information can be inferred. The images of these structures contain lines and/or curves whose orientation, lengths, and intersections characterize the overall network.Some examples exist of studies that have been done in the analysis of networks of natural structures. In, Sebok and Roemer determine the complexity of nerve structures in an EM formed slide. Here the number of nodes that exist in the image describes how dense nerve fibers are in a particular region of the skin. Hildith proposes a network structural analysis algorithm for the automatic classification of chromosome spreads (type, relative size and orientation).


Author(s):  
Yashpal Jitarwal ◽  
Tabrej Ahamad Khan ◽  
Pawan Mangal

In earlier times fruits were sorted manually and it was very time consuming and laborious task. Human sorted the fruits of the basis of shape, size and color. Time taken by human to sort the fruits is very large therefore to reduce the time and to increase the accuracy, an automatic classification of fruits comes into existence.To improve this human inspection and reduce time required for fruit sorting an advance technique is developed that accepts information about fruits from their images, and is called as Image Processing Technique.


Author(s):  
Biswanath Saha ◽  
Parimal Kumar Purkait ◽  
Jayanta Mukherjee ◽  
Arun Kumar Majumdar ◽  
Bandana Majumdar ◽  
...  

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