Showing papers in "Mapping Sciences & Remote Sensing in 1992"
TL;DR: Attempts by a research team to automate methods of air photo interpretation in order to speed up and make more objective the interpretation process in compiling maps of soil salinization are described.
Abstract: The paper describes efforts by a research team to automate methods of air photo interpretation in order to speed up and make more objective the interpretation process in compiling maps of soil salinization. The basic (inductive) approach involved the determination of spectral brightness coefficients and image photodensities for areas known to have specific characteristics with respect to relative areas of healthy and dead cotton plants and soil salinity. Attention is then devoted to the use of these relationships in algorithms used to discriminate saline, nonsaline, and mixed (saline/nonsaline) areas. Translated by Edward Torrey, Alexandria, VA 22308 from: Aerokosmicheskiye metody v pochvovedenii i ikh ispol'zovaniye v sel'skom khozyaystve: sbornik nauchnykh trudov [Remote Sensing Methods in Soil Science and Their Utilization in Agriculture: A Collection of Scientific Works]. Moscow: Nauka, 1990, pp. 226–231.
11 citations
TL;DR: Results of the mapping demonstrate the promise of digital image processing in the differentiation of a number of chernozem soil subtypes and explore the effects of variations in soil humus content, texture, and degree of erosion upon spectral brightness coefficients.
Abstract: The authors describe strategies for the utilization of digital image processing in the compilation of soil maps at scales of 1:1,000,000 and 1:25,000 for the trans-Volga region of Russia. Particular attention is devoted to an exploration of the effects of variations in soil humus content, texture, and degree of erosion upon spectral brightness coefficients. Results of the mapping demonstrate the promise of digital image processing in the differentiation of a number of chernozem soil subtypes. Translated by Edward Torrey, Alexandria, VA 22308 from: Aerokosmicheskiye metody v pochvovedenii i ikh ispol'zovaniye v sel'skom khozyaystve: sbornik nauchnykh trudov [Remote Sensing Methods in Soil Science and Their Utilization in Agriculture: A Collection of Scientific Works]. Moscow: Nauka, 1990, pp. 214–225.
6 citations
TL;DR: Torrey et al. as discussed by the authors described how terrain irregularities detectable on 1:25,000-scale topographic maps and 1:18,000 and 1.35,000 scale air photos can be employed in the location and study of loess deposits in planning and engineering work.
Abstract: The authors describe how terrain irregularities detectable on 1:25,000-scale topographic maps and 1:18,000- and 1:35,000-scale air photos can be employed in the location and study of loess deposits in planning and engineering work. More specifically, statistical correlations are identified between quantitative indices of the patterns of loess deposits on maps and air photos and specific characteristics of loess deposits in the field (thickness, thickness of slumped layers, percentage composition of clay fraction in deposit). Isarithmic maps derived from the statistical analysis of these relationships are presented. Translated by Edward Torrey, Alexandria, VA 22308 from: Izvestiya Vsesoyuznogo Geograficheskogo Obshchestva, 1991, No. 1, pp. 45–51.
2 citations
TL;DR: Vasil'yev et al. as discussed by the authors surveyed the types of general environmental change under way in the Aral Sea basin that can be detected on aerial photographs and space imagery.
Abstract: The author surveys the types of general environmental change under way in the Aral Sea basin that can be detected on aerial photographs and space imagery. The features and/or processes that can be so identified include: dust storms forming on dry tracts of former sea bottom, secondary salinization of irrigated crop land, changes in the position of the Aral shoreline, the geomorphology of the exposed sea bed, the genesis and growth of unintentional drainage-water lakes in closed depressions, the death of wetland vegetation communities, and the degradation of rangeland from overgrazing. Translated by Edward Torrey, Alexandria, VA 22308 from: L. N. Vasil'yev, ed., Kosmicheskiye metody izucheniya biosfery [Remote Sensing Methods in the Study of the Biosphere]. Moscow: Nauka, 1990, pp. 83–88.
2 citations
TL;DR: The author attempts to reinterpret the “information increment” hypothesis—i.e., that information derived from studying the spatial relationships of map symbols represents an unmanipulated increment to knowledge above and beyond the strictly content-related information conveyed by the symbols themselves—in such a way as to reconcile differences between the school of “communicative” and “geographic” cartography.
Abstract: The author attempts to reinterpret the “information increment” hypothesis—i.e., that information derived from studying the spatial relationships of map symbols represents an unmanipulated increment to knowledge above and beyond the strictly content-related information conveyed by the symbols themselves—in such a way as to reconcile differences between the school of “communicative” and “geographic” cartography. The basis for such a rapprochement, in his view, lies in recognizing the inseparability of information in its topologic and metric forms. Examples are provided in respect to the mapping of terrain and the hydrologic and settlement networks. Translated by Elliott B. Urdang, Providence, RI 02906 from: Izvestiya AN SSSR, seriya geograficheskaya, 1991, No. 2, pp. 122–131.
2 citations
TL;DR: Richardson as mentioned in this paper proposes a methodology whereby conventional hypsometric maps can be corrected through the use of air photos, and outlines principles for symbol generalization and selection whereby the amount of geomorphological information perceived on hyphometric maps is increased.
Abstract: In a critique of maps used for geomorphological research (too cluttered to be read effectively, too general in respect to contour positioning), the author describes: (a) a methodology whereby conventional hypsometric maps can be corrected through the use of air photos, (b) outlines principles for symbol generalization and selection whereby the amount of geomorphological information perceived on hypsometric maps is increased, and (c) recommends the joint use of hypsometric, topographic photo-, and general geomorphological maps as the most effective means of terrain analysis. Translated by Larry Richardson, Glendale, CA 91202 from: Geomorfologiya, 1991, No. 2, pp. 38–45.
1 citations
TL;DR: The authors describe the results of an experiment in compiling a data base for a global digital terrain model from information contained on a 1:15,000,000-scale hypsometric map, with particular emphasis on strategies for digitizing terrain data from the original map.
Abstract: The authors describe the results of an experiment in compiling a data base for a global digital terrain model from information contained on a 1:15,000,000-scale hypsometric map. Particular emphasis is placed on strategies for digitizing terrain data from the original map. A key feature affecting the results of such modeling is the delineation of continental boundaries—whether at the ocean shoreline or the edge of the continental shelf. Translated by Edward Torrey, Alexandria, VA 22308 from: Geomorfologiya, 1991, No. 2, pp. 25–31.
1 citations
1 citations
TL;DR: Torrey et al. as discussed by the authors investigated the fractal properties of geosystems at different scales using space imagery at various scales and proposed methods for determining fractal dimensions from vector fields and branching processes.
Abstract: Analysis of space imagery at different scales demonstrates that the spatial structure of geosystems possesses fractal properties. Two types of structures are investigated here: the distribution of cultivated fields in agricultural geosystems and the river and gully network. Methods for determining fractal dimensions from space images are proposed for each type of structure: vector fields and branching processes. The research was carried out in areas having different land uses. Translated by Edward Torrey, Alexandria, VA 22308.
TL;DR: In this paper, an experiment is described to test the applicability of remote sensing imagery in tracing the evolution of past (late Pleistocene-Holocene) landscapes into the present in an area of western India.
Abstract: An experiment is described to test the applicability of remote sensing imagery in tracing the evolution of past (late Pleistocene-Holocene) landscapes into the present in an area of western India (
TL;DR: Vasil'yev et al. as mentioned in this paper explored how such characteristics as the polarization of reflected radiation, the angular characteristics of its reflectance, and its thermal properties can be used to supplement conventional remote sensing studies of the condition of the vegetation cover.
Abstract: This paper explores how such characteristics as the polarization of reflected radiation, the angular characteristics of its reflectance, and its thermal properties can be used to supplement conventional remote sensing studies of the condition of the vegetation cover. One possible application is clarified by means of an experiment testing the relationship between the degree of polarization of radiation reflected from cultivated cotton fields and the condition of the crop in those fields. Empirical data demonstrate that changes in the geometric structure of (and reflectance from) fields occurs when cultivated plants are subjected to stress (disease or moisture deprivation). Translated by Edward Torrey, Alexandria, VA 22308 from: L. N. Vasil'yev, ed., Kosmicheskiye metody izucheniya biosfery [Remote Sensing Methods in the Study of the Biosphere]. Moscow: Nauka, 1990, pp. 77–82.