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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 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
The Selection of Landslide Risk Area Using AHP and Geomorphic Element
Min, Byung Keun ; Kang, In Joon ; Park, Dong Hyun ; Kim, Byung Woo ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 6_1, 2013, Pages 431~437
DOI : 10.7848/ksgpc.2013.31.6-1.431
Landslides are caused by earthquakes or heavy rains. Recently the incidence of landslides has been increased. However, it is impossible to predict the occurrence of landslide exactly. The purpose of this research is that subdivide the classes of elements in the landslide management system by using spatial analysis technique and AHP method. The existing landslide management system is only comprised of weighted value the slope elements without weighted value about the slop direction elements. For the accuracy improvement in landslide occurrence point, weighted value about the slope direction should be considered. This research is focused on segmentation in slope direction three categories. If the direction of landslide does not affect the structure, I do not think the subject is worth considerating. Based on these results will discuss the improvements in Landslides management systems. Analysis results, segmentation on the slope and the slope direction are needed. Segmented categories about topography elements will be increase the accuracy of landslides management system. Also, since topography of the elements is only considered, segmentation of different elements is needed.
Assessment of Soil Loss in Irrigation Reservoir based on GIS
Park, Woo Sik ; Hong, Soon Heon ; Ahn, Chang Hwan ; Choi, Hyun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 6_1, 2013, Pages 439~446
DOI : 10.7848/ksgpc.2013.31.6-1.439
This paper is about assessment of soil loss in irrigation reservoir based on GIS. Natural disaster caused by soil loss whose natural incidence has been rapidly reduced due to successful tree planting campaign shows high potential risk, since the latest localized heavy rain resulted from extreme weather event and artificial land development acts as direct factors for land disaster. To prevent it, various techniques and technologies have been used to predict effect of soil loss. However, reliability of techniques and technologies to predict its effect precisely is relatively low so far because the natural disaster by soil loss is taken place by complicated interaction between possible factors and direct factors. Geospatial approach is essential to examine these interactions. In this regard, this study will provide detailed plan to improve prediction reliability for soil loss of irrigation reservoir, using GIS that has Hydrologic -Topographical parameter and digital map as its input parameters.
Error Budget Analysis for Geolocation Accuracy of High Resolution SAR Satellite Imagery
Hong, Seung Hwan ; Sohn, Hong Gyoo ; Kim, Sang Pil ; Jang, Hyo Seon ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 6_1, 2013, Pages 447~454
DOI : 10.7848/ksgpc.2013.31.6-1.447
The geolocation accuracy of SAR satellite imagery is affected by orbit and sensor information and external variables such as DEM accuracy and atmospheric delay. To predict geolocation accuracy of KOMPSAT-5 and KOMPSAT-6, this paper uses TerraSAR-X imagery which has similar spec. Simulation data for sensitivity analysis are generated using range equation and doppler equation with several key error sources. As a result of simulation analysis, the effect of sensor information error is larger than orbit information error. Especially, onboard electronic delay needs to be monitored periodically because this error affects geolocation accuracy of slant range direction by 30m. Additionally, DEM accuracy causes geolocation error by 20~30m in mountainous area and atmospheric delay can occur by 5m in response to atmospheric condition and incidence angle.
Epipolar Image Resampling from Kompsat-3 In-track Stereo Images
Oh, Jae Hong ; Seo, Doo Chun ; Lee, Chang No ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 6_1, 2013, Pages 455~461
DOI : 10.7848/ksgpc.2013.31.6-1.455
Kompsat-3 is an optical high-resolution earth observation satellite launched in May 2012. The AEISS sensor of the Korean satellite provides 0.7m panchromatic and 2.8m multi-spectral images with 16.8km swath width from the sun-synchronous near-circular orbit of 685km altitude. Kompsat-3 is more advanced than Kompsat-2 and the improvements include better agility such as in-track stereo acquisition capability. This study investigated the characteristic of the epipolar curves of in-track Kompsat-3 stereo images. To this end we used the RPCs(Rational Polynomial Coefficients) to derive the epipolar curves over the entire image area and found out that the third order polynomial equation is required to model the curves. In addition, we could observe two different groups of curve patterns due to the dual CCDs of AEISS sensor. From the experiment we concluded that the third order polynomial-based RPCs update is required to minimize the sample direction image distortion. Finally we carried out the experiment on the epipolar resampling and the result showed the third order polynomial image transformation produced less than 0.7 pixels level of y-parallax.
Availability Evaluation of FKP-RTK Positioning for Construction Survey Application
Kim, In Seup ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 6_1, 2013, Pages 463~469
DOI : 10.7848/ksgpc.2013.31.6-1.463
In addition to the VRS-RTK service, FKP-RTK service launched recently in Korea however unlike VRS, it is not yet applied to various surveying tasks. VRS system is operated in two way communication over the mobile Internet. When user send rover position data to network RTK server and the server provides correction data to users continuously. It causes to increase communications load and makes delaying or failure in data transmission depends on server capacity and number of concurrent users. In contrast, since FKP system is one way communication system, user only receives correction data and area correction parameters for the selected Continuous Reference Station from the server. Thus, there is no limitation to the number of concurrent users in FKP system and it would be more efficient than VRS system in terms of economic. To this end, we performed FKP-RTK test for Unified Control Points and Urban Control Points where are located at 5 regions in Korea to evaluate the accuracy. As a result, almost of FKP positioning data are in error range of
in horizontal and it would be enough for construction survey such as for earth work in limited except precise structure survey.
Analysis of Debris Flow Deposition based on Topographic Characteristics of Debris Flow Path
Kim, Gihong ; Youn, Junhee ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 6_1, 2013, Pages 471~481
DOI : 10.7848/ksgpc.2013.31.6-1.471
Recently, the frequency of debris flow disaster has increased, which is one of the natural disasters during extremely heavy rainfall condition. This paper described the analysis method about deposition characteristics of debris flow using topographic characteristics of debris flow path. First, we observed topographic changes by differencing high- resolution LiDAR DEMs acquired before and after the occurrence of debris flow event. We assumed that deposition on outside of debris flow path was generated by movements due to the inertia of debris flows. Then, we analyzed three topographic characteristics of debris flow path: slope in flow direction, transition angle of flow path, and the net efficiency(L/H) of debris flows defined by the ratio of transport length(L) and elevation difference(H). We applied this method to Umyeon Mountain debris flow event in July 2011. The results showed that deposition on outside of debris flow path due to the inertia of debris flows was significantly related to the transition angle of debris flow path. Also, we figured out that there were more frequent such depositions in locations where the ratio of `transition angle / (L/H)` is over 8.
Automatic Change Detection Based on Areal Feature Matching in Different Network Data-sets
Kim, Jiyoung ; Huh, Yong ; Yu, Kiyun ; Kim, Jung Ok ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 6_1, 2013, Pages 483~491
DOI : 10.7848/ksgpc.2013.31.6-1.483
By a development of car navigation systems and mobile or positioning technology, it increases interest in location based services, especially pedestrian navigation systems. Updating of digital maps is important because digital maps are mass data and required to short updating cycle. In this paper, we proposed change detection for different network data-sets based on areal feature matching. Prior to change detection, we defined type of updating between different network data-sets. Next, we transformed road lines into areal features(block) that are surrounded by them and calculated a shape similarity between blocks in different data-sets. Blocks that a shape similarity is more than 0.6 are selected candidate block pairs. Secondly, we detected changed-block pairs by bipartite graph clustering or properties of a concave polygon according to types of updating, and calculated Fr
chet distance between segments within the block or forming it. At this time, road segments of KAIS map that Fr
chet distance is more than 50 are extracted as updating road features. As a result of accuracy evaluation, a value of detection rate appears high at 0.965. We could thus identify that a proposed method is able to apply to change detection between different network data-sets.
Study on the Korean Accuracy Standards Setting of Digital Map for the Construction and Utilization of Precise Geospatial Information
Park, Hong Gi ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 6_1, 2013, Pages 493~502
DOI : 10.7848/ksgpc.2013.31.6-1.493
For various geospatial information such as planimetric and topographic features, the required accuracy may be defined depending on the purpose of GIS applications. Also, the accuracy of the geospatial information have a major impact on the quality of the raw surveying data. In order to be usefully applied the precise geospatial information, the accuracy standards must be appropriately set so that the digital map as base map can be accurately made. Before computer mapping and GIS technology existed, paper maps were drawn by hand. So, the map scale was a significant contributor to the map accuracy. As such the past, the accuracy of maps is determined the scale at which the map would be drawn, but recent trends are to treat accuracy as a one of quality elements, rather than a specification for producing the map. Therefore, the purpose of this paper is to set the new korean map accuracy standards appropriate for the construction and application of the precise geospatial information on behalf of the current representation of korean digital maps.
Positioning Accuracy Analysis of KOMPSAT-3 Satellite Imagery by RPC Adjustment
Lee, Hyoseong ; Seo, Doochun ; Ahn, Kiweon ; Jeong, Dongjang ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 6_1, 2013, Pages 503~509
DOI : 10.7848/ksgpc.2013.31.6-1.503
The KOMPSAT-3 (Korea Multi-Purpose Satellite-3), was launched on May 18, 2012, is an optical high-resolution observation mission of the Korea Aerospace Research Institute and provides RPC(Rational Polynomial Coefficient) for ground coordinate determination. It is however need to adjust because RPC absorbs effects of interior-exterior orientation errors. In this study, to obtain the suitable adjustment parameters of the vendor-provided RPC of the KOMPSAT-3 images, six types of adjustment models were implemented. As results, the errors of two and six adjustment parameters differed approximately 0.1m. We thus propose the two parameters model, the number of control points are required the least, to adjust the KOMPSAT-3 R PC. According to the increasing the number of control points, RPC adjustment was performed. The proposed model with a control point particularly did not exceed a maximum error 3m. As demonstrated in this paper, the two parameters model can be applied in RPC adjustment of KOMPSAT-3 stereo image.