Accueil du site EFITA Congresses>EFITA 2007>GIS / Spatial systems

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LandSFACTS: Software for Spatio-temporal Allocation of Crops to Fields - Marie S. Castellazzi, Joanne Matthews, Gavin A. Wood, Paul J. Burgess, Kelvin F. Conrad, and Joe N. Perry - (1-8-2007)

A description of crop arrangements is often required in spatio-temporal models of agricultural landscapes, such as for crop coexistences and soil erosion modelling. However, empirical data on spatial and temporal arrangements of crops are rarely readily available. Site-specific solutions, based on national statistics and expert knowledge, can be developed, but such approaches do not permit reshaping of crop arrangements practically to build landscape scenarios.
LandSFACTS is software to facilitate generating land-uses through time at the landscape scale for research modelling purposes. It is specifically designed to (i) set up realistic scenarios of crop allocation including enforcing minimum separation distances between crops, and, (ii) to fill out incomplete datasets, (i.e. datasets missing field-specific data). LandSFACTS allocates crops to fields through time, while respecting crop rotations and spatio-temporal conditions on crop arrangements. Crop rotations are mathematically integrated within the model as transition matrices of crops, defining the probability of crop to crop succession as a Markov process. Spatio-temporal conditions are divided into two types (i) temporal and spatial restrictions on crop allocation. (e.g. return period of crops, or separation distances between crops) and (ii) general crop patterns, measured by using specifically designed statistical tests. LandSFACTS may be used for any agricultural landscape because no agronomic information is intrinsic to the software. The limitations imposed by the model are its smallest spatial and temporal unit: only one crop is allocated per field and per year.
The software is designed in a modular format, permitting the addition of extensions, such as social or economic modules. The final version of LandSFACTS will be released as open source software under the GNU Public Licence. More...

 
Dynamic geovizualization of landscape changes and threatening processes using digital landscape model - Dr. Hana Svatonova, Ph.D. , doc. RNDr. Jaromír Kolejka, CSc., Ing. Karel Charvát - (1-8-2007)

It is useful to introduce data about the natural environment into the same relationships as they operate in any real landscape. The digital landscape model serves as the product of the logical geodata integration. The Central European agricultural landscape experienced the most dramatic changes in late 1950s. Historical B&W aerial imagery from 1953 was unified into seamless mosaic and ortorectified in the Leica Photogrammetry Suit environment. Using Virtual GIS animation technology flights both over reconstructed past and the present landscape were simulated accompanied with fluent changes of landscape historical models to show land use development in time. More...

 
GIS and Remote Sensing in Diachronic Study of Agriculture in Greece - Maria Androulidaki, Michail Salampasis, Vagis Samathrakis, Christos Batzios - (1-8-2007)

A basic control factor of diachronic monitoring of land use is the recording of land use in different time periods. The agricultural cadastre and the recording of cultivated land with the use of a GIS will facilitate the calculation of subsidies, the control of irrigations, the guarantee of quality of biological products, the land control, the damage assessment from meteorological phenomena etc. Data that can be used are the statistical elements, the aerial photographs and the satellite pictures. The use of aerial photographs is ideal
for the follow-up of changes that occur in the use of ground of rural extents; pasture lands and forests over a long period of time. The technique of three-dimensional visualization facilitates the use of Tele- Surveying technologies. Tele Surveying is useful in recognizing objects and ground characteristics with the observation from receptions above the ground. A more modern extension of using aerial photographs is the utilization of satellite pictures. As the relevant technology progresses it allows henceforth the reception of digital photographs from very long distance with high precision. The observation of changes in earth's anaglyph with the use of Remote Sensing is the most recent trend in relevant research field. Serves specifically in regions with changes in bents, with problem of landslips, floods etc. Case studies of applying these technologies in Greece are presented and critically discussed. Rural land recording, precious material in the hands of institutions for the realisation of controls, forecasts and finally for making better political decisions that will help agricultural growth, Greek economy and environmental protection are deliberated. land control, the damage assessment from meteorological phenomena etc. Data that can be used are the statistical elements, the aerial photographs and the satellite pictures. The use of aerial photographs is ideal
for the follow-up of changes that occur in the use of ground of rural extents; pasture lands and forests over a long period of time. The technique of three-dimensional visualization facilitates the use of Tele- Surveying technologies. Tele Surveying is useful in recognizing objects and ground characteristics with the observation from receptions above the ground. A more modern extension of using aerial photographs is the utilization of satellite pictures. As the relevant technology progresses it allows henceforth the reception of digital photographs from very long distance with high precision. The observation of changes in earth's anaglyph with the use of Remote Sensing is the most recent trend in relevant research field. Serves specifically in regions with changes in bents, with problem of landslips, floods etc. Case studies of applying these technologies in Greece are presented and critically discussed. Rural land recording, precious material in the hands of institutions for the realisation of controls, forecasts and finally for making better political decisions that will help agricultural growth, Greek economy and environmental protection are deliberated. More...

 
Spatial analogues in climate change research - L. Horváth , M. Gaál, and N. Solymosi - (1-8-2007)

Several climate scenarios were elaborated to predict the climate change tendencies. This work is based on four scenarios of the HadCM3 model. Our target (reference) site was Debrecen, an important centre of agricultural production in Hungary. Scenario values for Debrecen were calculating using the average of the 4x4 covering grid-cells from the 10 minutes grid database. Then the method of spatial analogies was used to understand the meaning of these scenario values. Spatial (geographical) analogues are regions which today have a climate analogous to that predicted in the study region in the future. It has been found that regions similar to the predicted future climate of Debrecen are located south to Hungary. We used the HadCM3 model from the TYN SC 1.0 climatic database in different time periods. At the closest time this distance is about 100-300 km, but later it predicts a more drastic change. In the '20s all the scenarios (A1FI, A2, B1, B2) are similar, they predict mostly the same, differences are only later in the '50s. If we accept the result of spatial analogy, it seems that in the future the climate of Debrecen and its region will be similar to North Serbia (Vojvodina region) or South Romania. More...

 


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