broj: 9-10/2003
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| IZVORNI ZNANSTVENI ČLANCI | ||
| Idžojtić, M. | UDK 630* 442 (001) | |
| Hosts and Distribution of the White-berried Mistletoe (Viscum album L. ssp. album) in Croatia pdf HR EN | 439 | |
| Krejči, V., Dubravac, T. | UDK 630* 231 + 226 (001) | |
| Possibility and Justification of the Shelterwood Cutting Method in the Beech Forests of Gorski Kotar, Lika and Hrvatsko Primorje pdf HR EN | 449 | |
| Klobučar, D. | UDK 630* 583 + 585 (001) | |
| Assessment of the Accuracy of Geocoding the Basic Map of Croatia and the Digital Orthophotography pdf HR EN | 457 | |
| Summary: This paper presents basic determinants applied in the elaboration of digital orthophotographies through the usage of corresponding program packages. Digital orthophotography was made on the basis of black and white aerial photographs (M " 1:20 000), obtained during cyclic surveying of the Republic of Croatia. Given the fact that these aerial photographs can be obtained on the market for a favourable price and they can be a source of relatively great number of information relevant for forestry,, primary aim of this paper was to assess the accuracy of geocoding of digital orthophotographies, i.e. of Basic Map of Croatia (BMC). Deviations of eight geocoded BMC sheets, i.e. 1040 control points are 5,00 m below in relation to equivalent amounts of analogous originals. Calculated maximum deviation on the X co-ordinate is 3,68 on sheet 34 and 3,46 on Y co-ordinate on sheet 35, while all the average deviations except for X co-ordinate (-1,65m) on sheet 34 are lower than 1,0 m in positive or negative sense. The accuracy of geocoding of digital orthophotographies was carried out by means of 43 control points. The deviations on X and Y co-ordinates for the majority of control points are lower than 5,00 m in positive and negative sense, with average deviation on X co-ordinate -2,21 m and -4,34 on Y co-ordinate. Significant deviations were found for 6 control points in maximal amount of -25,85 m on X co-ordinate (control point 31) and -38,45 m on Y co-ordinate (control point 23). The accuracy of geocoding of digital orthophotographies is also satisfactory for application in the forestry of the Republic of Croatia because we are dealing with relatively minor deviations which refer to one point, i.e. object which has no dimensions, while all other objects almost entirely overlap with their projections on geocoded BMC either linearly or mono-dimensionally. Based on the aspects of presented research results, as well as a whole other sequence of other application options of digital orthophotographies, it is our recommendation, to elaborate a digital orthophotography whenever management plans are made (regular revisions), providing, if possible, that the aerial photos be made in a bigger scale and the control points cover entire photos, which would diminish observed mistakes. Key words: digital orthophotographies; Basic Map of Croatia (BMC); geocoding; cyclic aerial surveys; digital terrain models (DTM) | ||
| PRETHODNO PRIOPĆENJE | ||
| Prka, M. | UDK 630* 443 + 323 + 325 | |
| Occurrence of False Heartwood in Beech Trees and Technical Beech Roundwood Coming from Thinning and Preparatory Fellings in the Area of Bjelovar Bilogora pdf HR EN | 467 | |
| STRUČNI ČLANCI | ||
| Margaletić, J., Margaletić, M. | UDK 630* 435 + 432 | |
| Fires in Forests and Forestlands as Habitat Degradation Factors pdf HR EN | 475 | |
| Sabadi, R. | UDK 630* 904 | |
| German Forestry in 2002/2003 pdf HR EN | 483 | |
| Tolić, I. | UDK 630* 164 + 160 + 261 | |
| Commercial and other Values of the Genus Pistacia Species pdf HR EN | 501 | |