Yazar "Bildirici, I. Oztug" seçeneğine göre listele

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    Evaluation of Educational Atlas Maps in Terms of Cartographic Design
    (IOP PUBLISHING LTD, 2016) Bugdayci, Ilkay; Bildirici, I. Oztug
    Nowadays, many specialists in geography recommend the usage of digital maps and atlases. But in educational system, especially in Turkey, a traditional cartography based on paper maps is used more than the digital ones. This report considers the deficiencies of current atlas maps that are used in the education of geography and social studies in terms of cartographic design. About 22 atlases has been investigated for the study. Several examples are given from these school atlases and some proposals are introduced about designing children maps.
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    GEOGRAPHIC INFORMATION SYSTEM FOR KONYA CLOSED BASIN PROJECT
    (BULGARIAN CARTOGRAPHIC ASSOC, 2012) Ustun, Aydin; Bildirici, I. Oztug; Ustuntas, Taner; Tusat, Ekrem; Ozkan, Ihsan; Eren, Yasar; Ozdemir, Adnan
    The main goal of the Konya Closed Basin Project is to investigate land subsidence within the basin. The vertical changes have been investigated through GPS measurements and InSAR images taken at different dates. In order to decide whether the land subsidence is significant for land use in residential and agricultural areas within the basin, a GIS system is necessary. For this purpose GoogleEarth, MapInfo and Generic Mapping Tools (GMT) were chosen as GIS software packages. At first, a preliminary study has been performed using I: 100 000 and 1: 250 000 topographic maps which are scanned and registered. A continuous mosaic of map sheets created from them is overlaid on the terrain in the Google Earth. GPS deformation network was designed over the mosaic map considering land use and hydrogeological properties of the KCB. Other data that the system contains are GPS points, wells, at which water depth is measured, InSAR images, geologic layers created from geological maps, and land use maps created by using NVDI method. The geology maps are digitized in MapInfo. After the completion of data collection, GIS analyses will be undertaken in order to evaluate land subsidence potential of the basin.
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    Land subsidence in Konya Closed Basin and its spatio-temporal detection by GPS and DInSAR
    (SPRINGER, 2015) Ustun, Aydin; Tusat, Ekrem; Yalvac, Sefa; Ozkan, Ihsan; Eren, Yasar; Ozdemir, Adnan; Bildirici, I. Oztug
    Konya Closed Basin that includes two depression blocks, Konya and Tuz Golu, is the biggest endorheic basin in Turkey. A lowering in the ground levels of the depositional areas has been shown with respect to the surrounding mountains. In the past, this process was controlled by geological and hydrogeological phenomena; nowadays, it has gained a new dimension due to the excessive pumping of groundwater to the Earth's surface. The geodetic techniques such as Global Positioning System (GPS) and Interferometric Synthetic Aperture Radar (InSAR) reveal a considerable land subsidence resulting in the rate of 1-4 cm/year in Konya sub-basin. It seems that the calculated amounts are responsible for changing environmental conditions like seasonality. Both GPS and differential InSAR techniques verify these relatively small fluctuations in the subsidence development. Target districts that should be observed primarily are agricultural zones where groundwater is overused for irrigation and regions where human population density is high. The geocoded interferogram and vegetation index map verify the spatial relation between the subsidence and green areas. In this study, a project dealing with the investigation of the land subsidence occurrences and of their possible causes and consequences within a specific part of Konya Closed Basin is introduced.
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    A PRACTICAL APPROACH TO CREATE ISARITHMIC MAP LAYERS THAT CAN BE USED WITH WEB MAPPING SERVICES
    (BULGARIAN CARTOGRAPHIC ASSOC, 2016) Kirtiloglu, Osman S.; Bildirici, I. Oztug
    This study summarizes a practical approach to create an isarithmic map layer that can be used with online web mapping services such as Google Maps, Bing Maps, MapQuest, Open Street Map and so on. Isarithmic maps are types of thematic maps that represent a continuous field using isolines (lines of equal value) and isopleths (regions of similar value). Isarithmic maps are created by interpolating a set of isolines between sample points of known values. Also there are some basic solutions to create custom thematic maps with web mapping services - like choropleth maps - there is no clear solution to create isarithmic map layers and visualize them on an online map. To find a solution to this problem, we focused on JSON data interchange format for data layer and Multi-quadric Radial Basis Function Interpolation method for interpolating set of isolines. An alternative to XML, JavaScript Object Notation or JSON is a popular data-interchange that is now commonly used by web-mapping tools and web-based APIs. It is easy for humans to read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language. JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties make JSON an ideal data-interchange language. There are different types of formalized JSON syntax -such as GeoJSON for storing geodata such as points as longitude/latitude coordinates and shapes and other spatial features and TopoJSON that improves upon GeoJSON by processing GIS data with geospatial topology - for storing different types of optimized data. The main goal of this study is to develop a program with C programming language which starts with segmenting the area of interest (study area border with closed polyline) into cells that's number is determined by the user by taking into account the point in polygon test. Then interpolating sample points and assign interpolated values to each cell (centroid) by using multi-quadric interpolation method. As final step, the program writes all parameters according to GeoJSON format. The output file then can be used as a data layer for many web mapping services.
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    Triangulation Method for Area-line Geometry-type Changes in Map Generalisation
    (MANEY PUBLISHING, 2010) Selvi, Huseyin Zahit; Bildirici, I. Oztug; Yerci, Mehmet
    Changes in object geometry-type such as area to line are necessary in terms of the requirements of cartographic generalisation, and also for the creation of the network topology in geographical information systems. Geometry-type changes that reduce dimension include area-line, area-point and line-point changes. This study focuses on area-line changes. Since the area objects have different shapes, there is no unique solution that works in all possible situations. Well-known methods for area-line changes include triangulation, water lining, straight skeletons, etc. In this paper, an approach based on triangulation is introduced for creating road centerlines from blocks of parcels. Spaghetti large-scale map data are taken into consideration in this approach in which blocks of parcels are captured as polygons and roads are represented by the space between them. In order to implement this approach, a subprogram (script) is developed under the NETCAD software package a Turkish CAD-GIS software package with the Visual Basic scripting language. This subprogram also includes post-processing routines for the relevant node creation at road crossings, and delivers acceptable results for the centerlines; however, the post-processing needs to be improved.