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Messić Kiš, Ivan; Mesić Kiš, Ivana
05/2017Web Resource
Analiziran je prostor Bjelovarske subdepresije na lokalnoj (polje Šandrovac) i regionalnoj razini (cijela subdepresija). Ulazni podatci bile su dubine EK granice Pt/Tg i EK markera Rs7, Rs5, Z', Δ i D'. Statistički je analizirano više od sedamsto podataka očitanih s pravilne mreže kojom su prekrivene postojeće paleostrukturne karte, s ćelijama veličine 2x2 km. Kartirano je metodama Thiessenovih poligona (program SAGA GIS) i krigiranja (Surfer). Poligonalna, tj. zonalna procjena uporabljena je kao jednostavna i brza metoda prikaza dubina. Krigiranje je dalo znatno bolje regionalne karte. Obično krigiranje je dokazano u većini slučajeva kao najbolja moguća interpolacija podataka dubine (Pt/Tg, Rs7, Z' i D'), uz najmanje vrijednosti krosvalidacije. Njome su interpolirane karte debljina formacija iz kojih su reinterpretirani neogensko-kvartarni okoliši. Nadalje, unutar pojedinačnih struktura, tehnika univerzalnoga krigiranja određena je kao najprimjerenija interpolacijska metoda, jer je samo u takvim slučajevima bilo moguće izdvojiti jasan linearni trend u pružanju i dubinama promatrane strukture. The area of Bjelovar subdepression was analyzed at the local (Šandrovac Field) and regional level (the entire subdepression). Input data were depths of Pt/Tg e-log border and Rs7, Rs5, Z’, Δ and D' e-log markers. More than seven hundred data were statistically analyzed. The data were collected in a regular grid that covers the existing paleostructural maps, with cells 2x2 km in size. Mapping was carried out using Thiessen polygon method (program SAGA GIS) and Kriging (Surfer). The polygonal, i.e. the zonal assessment was used as a simple and fast method for displaying depths. Kriging gave significantly better regional maps. Ordinary Kriging has been proved in most cases to be the best possible interpolation of depth data (Pt/Tg, Rs7, Z' and D'), with the lowest cross-validation values. It was used for interpolation of formation thickness maps from which Neogene-Quaternary environments were reinterpreted. Furthermore, within the individual structures, Universal Kriging technique is determined as the most appropriate interpolation method, because it was only possible in such cases to extract a clear linear trend in extent and depths of the observed structure.
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