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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
Journal Basic Information
Journal DOI :
Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography
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Volume & Issues
Volume 25, Issue 6_2 - Dec 2007
Volume 25, Issue 6_1 - Dec 2007
Volume 25, Issue 5 - Oct 2007
Volume 25, Issue 4 - Aug 2007
Volume 25, Issue 3 - Jun 2007
Volume 25, Issue 2 - Apr 2007
Volume 25, Issue 1 - Feb 2007
Selecting the target year
Optimal Path Finding based on Raster GIS in Indoor Spaces
Kim, Byung-Hwa ; Jun, Chul-Min ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 25, issue 1, 2007, Pages 1~8
People tend to spend more time in indoor spaces than before such as shopping malls and subway stations. As buildings become larger and more complex, people feel difficulty in finding their ways to destinations. Consequently, a means to provide better paths can aid people in reducing time for finding ways. Routing information in large indoor spaces is especially required in emergency cases as fire, power failure and terror. This study suggests to compute optimal paths using
algorithm based on raster GIS data structure. The suggested method can be used either in daily lives for path provision or in emergency cases for evacuation, and is illustrated on a campus building.
To Evaluate the Accuracy of DEMs Derived from the Various Spectral Bands of Color Aerial Photos
Kim, Jin-Kwang ; Hwang, Chul-Sue ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 25, issue 1, 2007, Pages 9~17
In this study, Digital Elevation Models (DEMs) were constructed from color images, grayscale images and each bands (Red, Green, Blue) of color image, and the accuracies of each DEMs were evaluated, And then, correlation coefficients between left and right images of each stereopairs were analyzed. The DEM can be constructed conventionally from the digital map and stereopair images using image matching. The image matching requires stereo satellite images or aerial photographs. In case of rotor aerial photographs, these are to be scanned in 3 bands (Red, Green, Blue). For this study, 5 types of images were acquired; color, grayscale, RED band, GREEN band, and BLUE band image. DEMs were constructed from 5 types of stereopair images and evaluated using elevation points of digital maps. In order to analyze the cause of various accuracies of each DEMs, the similarity between left and right images of each stereopairs were analyzed. Consequently, the accuracy of the DEM constructed from RED band images of color aerial photograph were proved best.
Developing and Valuating 3D Building Models Based on Multi Sensor Data (LiDAR, Digital Image and Digital Map)
Wie, Gwang-Jae ; Kim, Eun-Young ; Yun, Hong-Sic ; Kang, In-Gu ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 25, issue 1, 2007, Pages 19~30
Modeling 3D buildings is an essential process to revive the real world into a computer. There are two ways to create a 3D building model. The first method is to use the building layer of 1:1000 digital maps based on high density point data gained from airborne laser surveying. The second method is to use LiDAR point data with digital images achieved with LiDAR. In this research we tested one sheet area of 1:1000 digital map with both methods to process a 3D building model. We have developed a process, analyzed quantitatively and evaluated the efficiency, accuracy, and reality. The resulted differed depending on the buildings shape. The first method was effective on simple buildings, and the second method was effective on complicated buildings. Also, we evaluated the accuracy of the produced model. Comparing the 3D building based on LiDAR data and digital image with digital maps, the horizontal accuracy was within
. From the above we derived a conclusion that 3D building modeling is more effective when it is based on LiDAR data and digital maps. Using produced 3D building modeling data, we will be utilized as digital contents in various fields like 3D GIS, U-City, telematics, navigation, virtual reality and games etc.
An Analysis on the Management of Government-Owned Land using Cadastral Survey
Bhang, Jong-Sik ; Jun, Chul-Min ; Kwon, Jay-Hyoun ; Choi, Yun-Soo ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 25, issue 1, 2007, Pages 31~37
Since the government-owned land is the national property, the country is responsible for the management. Although one can see the recent activities of government to efficiently manage and maintain the government-owned land, its characteristics are not well reflected on the current managing methods. Obviously, efficient and prefer methods for the field survey is necessary for efficient management. In this study, the current management methods focused on the site srvey are analyzed and problems are deduced. Basically the current methods depending on the graphic information and cadastral survey results are compared with real illegal occupancy case. The investigation clearly shows the necessity of the cadastral survey and proved the current method is not sufficient to detect illegal occupancy on government-owned land. It is expected that this study contributes on establishing an efficient management methods for the government-owned land.
A Study on the Optimal Combination of Central Meridian and Scale Factor of UTM-K for Application of Korea Peninsula
Lee, Hee-Bum ; Heo, Joon ; Kim, Woo-Sun ; Lee, Jung-Bin ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 25, issue 1, 2007, Pages 39~45
In this paper, a research has been conducted to find out the optimal combination of central meridian and scale factor of UTM-K to apply for the whole area of Korean peninsula. For this research, various combinations of central meridian and stale factor are set up and the cumulated level or distortion for each combination has been computed and compared to each other. In the case of using the central meridian and scale factor defined in the present UTM-K, the level of distortion shows about
. On the other hand, the minimum distortion which is about
can be obtained when the
for the central meridian and 0.99991 for scale factor are used for computation. Consequently, we can conclude that later result is the optimum combination of central meridian and scale factor for the Korean peninsula.
Technique of Seam-Line Extraction for Automatic Image Mosaic Generation
Song, Nak-Hyeon ; Lee, Sung-Hun ; Oh, Kum-Hui ; Cho, Woo-Sug ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 25, issue 1, 2007, Pages 47~53
Satellite image mosaicking is essential for image interpretation and analysis especially for a large area such as the Korean Peninsula. This paper proposed the technique of automatic seam-line extraction and the method of creating image mosaic in automated fashion. The seam-line to minimize artificial discontinuity was extracted using Minimum Absolute Gray Difference Sum algorithm with constraint condition on search-area width and Canny Edge Detection algorithm. To maintain the radiometric balance among images acquired at different time epochs, we utilized Match Cumulative Frequency method. Experimental results showed that edge detection algorithm extracted the seam-lines significantly well along linear features such as roads and rivers.
A Segmented Morphology Filter for Airborne LiDAR Data
Choi, Seung-Sik ; Song, Nak-Hyeon ; Cho, Woo-Sug ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 25, issue 1, 2007, Pages 55~62
Recent advances in airborne LiDAR technology allow rapid and inexpensive measurements of topography over large areas. The generation of DTM/DEM is essential to numerous applications such as the fields of civil engineering, environment, city planning and flood modeling. The demand for LiDAR data is increasing due to the reduced cost for DTM generation and the increased reliability, precision and completeness. In order to generate DTM, measurements from non-ground features such as building and vegetation have to be classified and removed. In this paper, a segmented morphology filter was developed to detect non-ground LiDAR measurements. First, segments LiDAR point clouds based on the elevation. Secondly classifies those protruding segments into non-ground points. Those non-ground points such as building and vegetation are removed, while ground points are preserved for DTM generation. For experiments, data sets used in Comparison of Filters (ISPRS, 2003) depicting urban and rural areas were selected. The experimental results show that the proposed filter can remove most of the non-ground points effectively with less commission and omission errors.
Numerical Computation of Ultra-High-Degree Legendre Function
Kwon, Jay-Hyoun ; Lee, Jong-Ki ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 25, issue 1, 2007, Pages 63~68
The computations of an ultra-high degree associated Legendre functions and its first derivative up to degree and order of 10800 are reported. Not only the magnitude of orders for the ultra-high degree calculation is presented but the numerical stability and accuracy of the computed values are described in detail. The accuracy on the order of
was obtained for the values of Legendre function and the first derivatives of Legendre functions, respectively. The computable highest degree and order of Legendre function in terms of latitudes and the linear relationship between the magnitude of the function with respect to degrees and orders is found. It is expected that the computed Legendre functions contribute in many geodetic and geophysical applications for simulations as well as theoretical verifications.
Data Exchange between Cadastre and Physical Planning by Database Coupling
Kim, Kam-Rae ; Choi, Won-Jun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 25, issue 1, 2007, Pages 69~75
The information in physical planning field shows the socio-economic potentials of land resources while cadastral data does the physical and legal realities of the land. The two domains commonly deal with land information but have different views. Cadastre has to evolved to the multi-purpose ones which provide value-added information and support a wide spectrum of decision makers by mixing their own information with other spatial/non-spatial databases. In this context, the demands of data exchange between the two domains is growing up but this cannot be done without resolving the heterogeneity between the two information applications. Both of either discipline sees the reality within its own scope, which means each has a unique way to abstract real world phenomena to the database. The heterogeneity problem emerges when an GIS is autonomously and independently established. It causes considerable communication difficulties since heterogeneity of representations forms unique data semantics for each database. The semantic heterogeneity obviously creates an obstacle to data exchange but, at the same time, it can be a key to solve the problems too. Therefore, the study focuses on facilitating data sharing between the fields of cadastre and physical planning by resolving the semantic heterogeneity. The core job is developing a conversion mechanism of cadastral data into the information for the physical planning by DB coupling techniques.