Wolfram Mauser

Data Processing For The Determination Of Pigments And Suspended Solids From Thematic Mapper Data

DATA PROCESSING The use of Thematic Mapper data for determination of chlorophyll and suspended solids in fresh water is shown. Data processing, an atmospheric correction model and a multiple regression model for chlorophyll A presented here. It is shown that it is possible to use Thematic Mapper data as a source for chlorophyll A mapping in f resh-water bodies. The regression model for chlorophyll is found to be significant up to the 90 percent level with a regression coefficient of 0.659.

Regional Assessment of Global Change Impacts

The research project GLOWA-Danube, which was one of the fi rst transdisciplinary research networks in the fi eld global change research in Germany, is introduced. GLOWA-Danube between 2001 and 2010 developed integrative tools and scenarios for the sustainable use of water in the Upper Danube basin under conditions of global change. Research was conducted by a large university-based network of scientists from natural and socio-economic fi elds. The paper introduces the project overall philosophy, its aims, design, new methodological approaches to developing simulation tools, scenarios and stakeholder dialogue and the scope and architecture of the Global Change Atlas – the Upper Danube, the primary communication tool between science and stakeholders.

Quantitative Analysis Of Agricultural Parameters Using Ger-imaging-spectroscopy Data Of The Eisac-89 Campagne

During the EISAC-89 Imaging-Spectroscopy Campagne data was acquired of an agricultural test site in the Upper Rhine Valley near the City of Freiburg using the GER-IS-Scanner. An intensive ground-check of plant parameters was carried out of a 24 km2 subset of the acquired image. The ground truth data was integrated in a Geographical Information System. The GER-data was radiometrically corrected using LOWTRAN-7 and geometrically registrated on the digital maps of the agricultural parameters. To detect correlations between the measured spectra and species-dependent plantparameters the following methods were used: spectra were extracted; the correlation-matrix in the visible and NIR was calculated; the reflectance red-edge was modelled through an inverted Gaussian fit; correlations of the red-edge parameters with agricultural parameters and the soil type were conducted.

Correlations Between Agricultural Plant Parameters And Multitemporal Radar Scatterometer Data. First Results From The European Agriscatt 87 Campaign

In the course of the European AGRISCATT 87 campaign ground truth was gathered on plant parameters of several crops in the German test site in Freiburg. Radar measurements with an airborne multiband scatterometer (DUTSCATT) gave sigma-0 values for 6 frequencies, 4 incidance angles and 2 polarisations. Correlation calculations between biomass and soil moisture of wheat and corn and the backscatter signals were carried out. For steep incidence angles and several frequencies good correlations with high regression coefficients were found. The measured backscatter values for the different crop types enabled together with a digitized map of the field boundaries and the land use the production of a synthetic radar image of the area.

The Use Of Multitemporal TM- And Spot-Data In Geographical Information System To Model The Spatial Variability Of Evapotranspiration

The spatial variability of soil-moisture and evapotranspiration has been modelled using a complex data-structure implemented in a GIS including data on land-use and plant-parameters derived from TM and SPOT as well as soil information from the German soil-survey on a 10 m grid basis. The evapotranspiration was modelled using the spatial data from the GIs, meteorological data from the German Weather Service and the Penman-Monteith equation for the stomata-controlled transpiration. The soil-moisture budget was determined using a simplified solution of the Philip-equation. The soil-plantatmosphere processes were coupled for each pixel in the 50 km2 study area and the temporal behavior of each pixel was calculated with a time-resolution of lh during the summer of 1986. Comparison with measured data show, that the different features of the calculated evapotranspiration are in good agreement with experiment. Keywords: environmental modelling, evapotranspiration, geographical information system