30 research outputs found
Cyanobacteria and cyanotoxins in Polish freshwater bodies.
In this work, the authors examined the presence of cyanobacteria and cyanotoxins in 21 samples collected from fresh water bodies located in 5 provinces in Poland: Lublin (2), Podlasie (1), Pomerania (6), Warmia-Masuria (1) and Wielkopolska (11). In addition, to determine the general pattern of geographical distribution, frequency of cyanobacteria occurrence, and cyanotoxins production, the published data from 238 fresh water bodies in Poland were reviewed. On the basis of these collected results, we concluded that Planktothrix, Aphanizomenon, Microcystis and Dolichospermum were dominant. The general pattern in geographical distribution of the identified cyanobacterial genera was typical of other eutrophic waters in Europe. The production of cyanotoxins was revealed in 18 (86%) of the 21 samples analyzed in the present work and in 74 (75%) of the 98 total water bodies for which the presence of toxins had been examined. Among the 24 detected microcystin variants, [Asp3]MC-RR was most common. These results can be verified when more data from the less explored water bodies in the southern and eastern parts of Poland are available.The authors would like to acknowledge the European Cooperation in Science and Technology, COST Action ES 1105 "CYANOCOST- Cyanobacterial blooms and toxins in water resources: Occurrence, impacts and management" for adding value to this study through networking and knowledge sharing with European experts and researchers in the field.42435837
Spectral library of herbaceous species of the University of Warsaw’s Botanic Garden
An objective of this paper is to form a spectral library of
endmembers of the Polish Lowland vegetation species, which
were collected in the Botanic Garden of the University of Warsaw,
which is one of the oldest (it was founded in 1818) and
the smallest (5 ha) botanic gardens in Poland. For the data
acquisition ASD FieldSec3 JR, Chlorophyll Content Meter
CCM-200 and a digital camera were used. Each spectral library
set contains: 300 separate spectrometric measurements
(100 dark current, 100 white reference and 100 ASD Plant
Probe Leaf Clip); Chlorophyll Content Index and biometric
information (e.g. LAI, fAPAR); 3 digital photos, time and localisation
data.
The spectral library contains 73 characteristics of the most
important plant species (from the “red list” of protected plants
and the most famous plants of the Polish Lowland Flora). Now
all these data will be upgrading the Swiss SPECCHIO library
as a local Polish input to the European spectral database
The influence of natural environment’s components on spatial diversity of thermal emissivity of the Gąsiennicowa Valley
Hyperspectral remote sensing is still being discovered as
a tool about analytical possibilities for the research on areas
about diversifi ed character, like mountain areas. This study
investigated the relationship between spatial variability of
surface temperature of the Gąsienicowa Valley (the Tatra
Mountains) and chosen components of the natural environment,
such as: near-surface lithology layers, soil surfaces, land
cover types, altitudes, slopes and aspects. Image of the surface
radiation temperature was processed basing on the Digital
Airborne Imaging Spectrometer (DAIS 7915) data. Thematic
layers were: acquired from the Tatra National Park GIS Office
(geology, lithology and soil layers), generated from DTM (altitude,
slopes and aspects) and created from the DAIS RGB
compositions data (land cover).
The analysis of relationship between components and surface
temperatures were measured by the power connection
index (Richling, 1983) and connection index (Zagajewski,
2003).
It has been stated that the greatest power of connections
occurred between the radiation temperature and the soil surface,
however on the majority surface of the Gąsienicowa Valley
temperature responses most strongly to the land cover
type
Assessment of geometry of radiation source-plant-detector on value of the remote sensing indices
The aim of this study is an analysis of an influence of geometry
electromagnetic radiation (lamp or sun) - research target
(leaves) - detector. The electromagnetic radiation was emitted
by the lamp ASD ProLamp, which was installed at 30°, 45°,
90°, 135°, 150° angles. Reference measurements was a system
in which the lamp and detector were set vertically. During the
laboratory measurements spectral properties of Rhoeo spathacea
were acquired. Based on the measured spectral curves of
vegetation remote sensing indices were calculated and statistical
ANOVA tests were applied. The results confirmed the
relationship between the geometry of the lamp - plant - detector.
The higher the angle the incident radiation results were less
diverse and close to optimum values were observed. Analysis
of the indicators showed that the high variability characterized
by the indicators measuring water, chlorophyll contents
and overall vigor parameters of plants. While the tests can be
used for measuring rates of nitrogen content, the absorption of
carotenoids and photosynthetically active radiation
Application of Sentinel-2 and EnMAP new satellite data to the mapping of alpine vegetation of the Karkonosze Mountains
Effective assessment of environmental changes requires an update of vegetation maps as it is an indicator of both local and global development. It is therefore important to formulate methods which would ensure constant monitoring. It can be achieved with the use of satellite data which makes the analysis of hard-to-reach areas such as alpine ecosystems easier.
Every year, more new satellite data is available. Its spatial, spectral, time, and radiometric resolution is improving as well. Despite significant achievements in terms of the methodology of image classification, there is still the need to improve it. It results from the changing needs of spatial data users, availability of new kinds of satellite sensors, and development of classification algorithms. The article focuses on the application of Sentinel-2 and hyperspectral EnMAP images to the classification of alpine plants of the Karkonosze (Giant) Mountains according to the: Support Vector Machine (SVM), Random Forest (RF), and Maximum Likelihood (ML) algorithms. The effects of their work is a set of maps of alpine and subalpine vegetation as well as classification error matrices. The achieved results are satisfactory as the overall accuracy of classification with the SVM method has reached 82% for Sentinel-2 data and 83% for EnMAP data, which confirms the applicability of image data to the monitoring of alpine plants
The use of the artificial neural networks to update the CORINE Land Cover maps
Aktualne mapy pokrycia terenu
są podstawą wielu dyscyplin nauki oraz mają szerokie
zastosowanie aplikacyjne. Jednym z problemów
aktualizacji map jest proces aktualizacji danych.
Teledetekcja dostarcza codziennie nowych zobrazowań
satelitarnych, które mogą zaspokoić potrzeby
aktualizacji baz danych. W niniejszym artykule autorzy
przedstawiają metodę klasyfikacji pokrycia terenu
sztucznymi sieciami neuronowymi fuzzy ARTMAP
zgodnie z założeniami i legendą Corine Land Cover
na podstawie danych satelitarnych Landsat, które
wykorzystywane są do opracowania map pokrycia
terenu. W artykule użyto jako danych referencyjnych
i weryfikacyjnych najnowszą mapę Corine Land Cover
(CLC) 2012. Do przeprowadzenia klasyfikacji
symulatorem wykorzystano trzy zdjęcia satelitarne
Landsat TM (21.04.2011, 05.06.2010, 27.08.2011).
Obszarem badań były okolice Warszawy. Wynikami
pracy symulatora są mapy klasyfikacji pokrycia terenu
oraz macierze błędów klasyfikacji. Uzyskane
wyniki potwierdzają, że sztuczne sieci neuronowe
mogą z powodzeniem być wykorzystywane do aktualizacji
map pokrycia terenu.Modern land cover maps are the basis of many
scientific disciplines and they are widely applied.
One of the problems connected with the revision of
maps is the data updating procedure. Remote Sensing
daily provides us with the new satellite images, that
can meet the needs of database updates. In this article
the method of classification for land cover with the
artificial, neural, fuzzy ARTMAP networks is presented
by the authors in accordance with the objectives and
legend of the CORINE Land Cover Map on the basis
of the Landsat satellite data, which are used to elaborate
the land cover maps. The latest CORINE
Land Cover map 2012 polygons are used as the reference
and verification data. Three satellite Landsat
TM images of 21.04.2011, 05.06.2010, 27.08.2011
are processed by a fuzzy, artificial, neural network
classificatory simulator. The area of research was
Warsaw and its surrounding area. The results of this
research are the classificatory land cover maps and
error matrices. Acquired results confirm that the artificial
neural networks can be successfully used for
land cover updating