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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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Journal DOI :
Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography
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Volume & Issues
Volume 31, Issue 6_2 - Dec 2013
Volume 31, Issue 6_1 - Dec 2013
Volume 31, Issue 5 - Oct 2013
Volume 31, Issue 4 - Aug 2013
Volume 31, Issue 3 - Jun 2013
Volume 31, Issue 2 - Apr 2013
Volume 31, Issue 1 - Feb 2013
Selecting the target year
Extracting Building Boundary from Aerial LiDAR Points Data Using Extended χ Algorithm
Cho, Hong-Beom ; Lee, Kwang-Il ; Choi, Hyun-Seok ; Cho, Woo-Sug ; Cho, Young-Won ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 2, 2013, Pages 111~119
DOI : 10.7848/ksgpc.2013.31.2.111
It is essential and fundamental to extract boundary information of target object via massive three-dimensional point data acquired from laser scanner. Especially extracting boundary information of manmade features such as buildings is quite important because building is one of the major components consisting complex contemporary urban area, and has artificially defined shape. In this research, extended
-algorithm using geometry information of point data was proposed to extract boundary information of building from three-dimensional point data consisting building. The proposed algorithm begins with composing Delaunay triangulation process for given points and removes edges satisfying specific conditions process. Additionally, to make whole boundary extraction process efficient, we used Sweep-hull algorithm for constructing Delaunay triangulation. To verify the performance of the proposed extended
-algorithm, we compared the proposed algorithm with Encasing Polygon Generating Algorithm and
-Shape Algorithm, which had been researched in the area of feature extraction. Further, the extracted boundary information from the proposed algorithm was analysed against manually digitized building boundary in order to test accuracy of the result of extracting boundary. The experimental results showed that extended
-algorithm proposed in this research proved to improve the speed of extracting boundary information compared to the existing algorithm with a higher accuracy for detecting boundary information.
A Comparative Study of Transverse Cylindrical Projection Functions by A Series of Numerical Simulations
Lee, Hungkyu ; Seo, Wansoo ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 2, 2013, Pages 121~134
DOI : 10.7848/ksgpc.2013.31.2.121
The transverse cylindrical projection has been used in Korea since 1910s when the nationwide geodetic network was firstly established. However, the projection has a number of different types of functions according to a way of its mathematical derivation as well as a section of its coefficients and terms, for instance Gauss- Schreiber(GS) and Gauss-Kruger(GK) types. Although the transverse cylindrical projection itself is assigned to a system, projected coordinates would be diverse with respect to the function used in the actual calculation. In order to investigate impact of functions used in the computation, five different equations (i.e., 2 GS and 3 GK) were implemented in this study by using MATLAB. A series of numerical simulation tests has been carried out to compare and characterize them in terms of projection accuracy, difference of projected coordinates and distortion. Furthermore, a comparison between GS and GK function was made under the Korean gridding system, consisting of four zones. Results from the numerical computations were qualitatively analyzed and summarized in this paper.
Decision Of EO Parameters Based On Direct Georeferencing Using SmartBase
Lee, Yong Wook ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 2, 2013, Pages 135~142
DOI : 10.7848/ksgpc.2013.31.2.135
Recently, it is a pretty well known way to compute GPS/INS using Continuously Operating Reference Station (CORS) and Network-based RTK for obtaining Exterior Orientation (EO) parameters of aerial photogrammetry. In this study, it is way to compute Exterior Orientation (EO) parameters using ground base stations, using Continuously Operating Reference Station (CORS) broadcast orbits and International GNSS Service (IGS) rapid orbits. And the residuals of Exterior Orientation (EO) parameters were computed based on the results of ground base station. As a result, the case of using SmartBase to obtain Exterior Orientation (EO) parameters was showed the high accuracy of X, Y, K more than using Continuously Operating Reference Station (CORS) of National Geographic Information Institute (NGII). Also, distance and direction of Continuously Operating Reference Station (CORS) of National Geographic Information Institute (NGII) from ground base station affected Exterior Orientation (EO) parameters. And different forms of residuals were shown according to the aerial photo courses.
Analysis of Temperature Change by Forest Growth for Mitigation of the Urban Heat Island
Yun, Hee Cheon ; Kim, Min Gyu ; Jung, Kap Yong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 2, 2013, Pages 143~150
DOI : 10.7848/ksgpc.2013.31.2.143
Recently, environmental issues such as climate warming, ozone layer depletion, reduction of tropical forests and desertification are emerging as global environmental problems beyond national problems. And international attention and effort have been carried out in many ways to solve these problems. In this study, the growth of green was calculated quantitatively using the technique of remote sensing and temperature change was figured out through temperature extraction in the city. The land-cover changes and thermal changes for research areas were analyzed using Landsat TM images on May 2002 and May 2009. Surface temperature distribution was calculated using spectral degree of brightness of Band 6 that was Landsat TM thermal infrared sensor to extract the ground surface temperature in the city. As a result of research, the area of urban green belt was increased by
and the ground surface temperature decreased by
before and after tree planting projects. Henceforth, if the additional study about temperature of downtown is performed based on remote sensing and measurement data, it will contribute to solve the problems about the urban environment.
A Study on the Introduction of the National Point Number for Advanced Location-Finding
Yang, Sungchul ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 2, 2013, Pages 151~157
DOI : 10.7848/ksgpc.2013.31.2.151
The law for indicating the address based on the street name has taken effect in 1997. The address based on land-lot number will be changed to the address based on the street name giving odd numbers to the buildings situated on the left side and even numbers to the buildings situated on the right side per street. Searching locations by street name addresses is possible for residential areas, on the other hand, the system of finding locations is insufficient for farmlands, mountains and others, so it is unable to cope with crimes and emergency rescue. In order to make up for the weak points of street name address, the national point number, grid reference system was introduced for finding location of non-residential areas. Therefore, the purpose of this paper is to help the introduction the national point number. In this paper, we proposed a territory-oriented control point and grid range for the national point number. Numbering scheme of grid zone shall be alphanumeric, a two-letter pair Hangul and the grid coordinates in terms of Easting and Northing. We also proposed the notice area for the national point number and location of signs, application about the public and private sector.
Displacement Measurement of a Floating Structure Model Using a Video Data
Han, Dong Yeob ; Kim, Hyun Woo ; Kim, Jae Min ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 2, 2013, Pages 159~164
DOI : 10.7848/ksgpc.2013.31.2.159
It is well known that a single moving camera video is capable of extracting the 3-dimensional position of an object. With this in mind, current research performed image-based monitoring to establish a floating structure model using a camcorder system. Following this, the present study extracted frame images from digital camcorder video clips and matched the interest points to obtain relative 3D coordinates for both regular and irregular wave conditions. Then, the researchers evaluated the transformation accuracy of the modified SURF-based matching and image-based displacement estimation of the floating structure model in regular wave condition. For the regular wave condition, the wave generator's setting value was 3.0 sec and the cycle of the image-based displacement result was 2.993 sec. Taking into account mechanical error, these values can be considered as very similar. In terms of visual inspection, the researchers observed the shape of a regular wave in the 3-dimensional and 1-dimensional figures through the projection on X Y Z axis. In conclusion, it was possible to calculate the displacement of a floating structure module in near real-time using an average digital camcorder with 30fps video.
Mosaic image generation of AISA Eagle hyperspectral sensor using SIFT method
Han, You Kyung ; Kim, Yong Il ; Han, Dong Yeob ; Choi, Jae Wan ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 2, 2013, Pages 165~172
DOI : 10.7848/ksgpc.2013.31.2.165
In this paper, high-quality mosaic image is generated by high-resolution hyperspectral strip images using scale-invariant feature transform (SIFT) algorithm, which is one of the representative image matching methods. The experiments are applied to AISA Eagle images geo-referenced by using GPS/INS information acquired when it was taken on flight. The matching points between three strips of hyperspectral images are extracted using SIFT method, and the transformation models between images are constructed from the points. Mosaic image is, then, generated using the transformation models constructed from corresponding images. Optimal band appropriate for the matching point extraction is determined by selecting representative bands of hyperspectral data and analyzing the matched results based on each band. Mosaic image generated by proposed method is visually compared with the mosaic image generated from initial geo-referenced AISA hyperspectral images. From the comparison, we could estimate geometrical accuracy of generated mosaic image and analyze the efficiency of our methodology.
Measurement of Soil Deformation around the Tip of Model Pile by Close-Range Photogrammetry
Lee, Chang No ; Oh, Jae Hong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 2, 2013, Pages 173~180
DOI : 10.7848/ksgpc.2013.31.2.173
In this paper, we studied on measurement of soil deformation around the tip of model pile by close-range photogrammetry. The rigorous bundle adjustment method was utilized to monitor the soil deformation in the laboratory model pile-load test as function of incremental penetration of the pile. Control points were installed on the frame of the laboratory model box case and more than 150 target points were inserted inside the soil around the model pile and on the surface. Four overlapping images including three horizontal and one vertical image were acquired by a non-metric camera for each penetration step. The images were processed to automatically locate the control and target points in the images for the self-calibration and the bundle adjustment. During the bundle adjustment, the refraction index of the acrylic case of the laboratory model was accounted for accurate measurement. The experiment showed the proposed approach enabled the automated photogrammetric monitoring of soil deformation around the tip of model pile.