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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
Validity Assessment of Viewpoints Using the Reverse-viewshed Frequency Analysis
Park, Jong Chan ; Um, Dae Yong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 5, 2013, Pages 343~353
DOI : 10.7848/ksgpc.2013.31.5.343
Recently, the landscape change by development has become more important and it's been stipulated that environmental effects evaluation must include LIA which reflects the said issue. Even though the selection of viewpoints which have the biggest impact on LIA result is stipulated in accordance with related rules, the criteria are inconsistent. Therefore, LIA experts' or project developers' subjective opinions have been very influential. In this case, wrong viewpoints which do not meet the selection criteria could be selected based on a discretionary interpretation on them, which could in turn substantially reduce an accuracy and reliability of the LIA results. Therefore, this research suggested the reverse-viewshed frequency technique as method that can be verified accuracy and reliability of viewpoints. And it has comparatively analyzed effective viewpoints using reverse-viewshed frequency analysis on viewpoints which were selected for LIA. As a result, the average validity was just 58% of total viewpoints used in construction sites. And the validity of viewpoints decreased as viewshed frequency increased. Based on results above, it was able to verify that the unreasonable points of a substantial proportion have been used as viewpoints in LIA process.
The Design and Implementation of BPEL for Spatial Analysis WPS model - With Emphasis on the Selection of Housing Units for Water Supply -
Lee, Ha Kyung ; Yom, Jae-Hong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 5, 2013, Pages 355~363
DOI : 10.7848/ksgpc.2013.31.5.355
Analysis and sharing of spatial information can be made possible through the reuse of spatial analysis processes, and the sharing of spatial models on the web. However, the deployment of spatial analysis models is possible, only when the difficult tasks of model design and the exchange of spatial data are overcome. In this study, a WPS spatial analysis model is defined, based on the OGC standards, and applied to the 'Selection of Housing Units for Water Supply' application. BPEL was used to define the sequence of processes and to enable the exchange of spatial data. To this end, WSDL was defined for WPS and WFS accesses, the sequence of spatial processes was defined in BPEL, and XSLT was defined for the exchange of XML data. The WPS model was designed and deployed using the Apache ODE which provides RESTful binding. It is expected that effective decision making will be easier using the web based spatial analysis models which are realized by WPS Orchestration with BPEL, as presented in this study.
Improvement of Partial Update for the Web Map Tile Service
Cho, Sunghwan ; Ga, Chillo ; Yu, Kiyun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 5, 2013, Pages 365~373
DOI : 10.7848/ksgpc.2013.31.5.365
Tile caching technology is a commonly used method that optimizes the delivery of map imagery across the internet in modern WebGIS systems. However the poor performance of the map tile cache update is one of the major causes that hamper the wider use of this technique for datasets with frequent updates. In this paper, we introduce a new algorithm, namely, Partial Area Cache Update (PACU) that significantly minimizes redundant update of map tiles where the update frequency of source map data is very large. The performance of our algorithm is verified with the cadastral map data of Pyeongtaek of Gyeonggi Province, where approximately 3,100 changes occur in a day among the 331,594 parcels. The experiment results show that the performance of the PACU algorithm is 6.6 times faster than the ESRI ArcGIS SERVER
. This algorithm significantly contributes in solving the frequent update problem and enable Web Map Tile Services for data that requires frequent update.
Time Series Analysis with ALOS PALSAR images and GPS data: Detection of Ground Subsidence in the Mokpo Area using the SBAS Algorithm
Kim, So-Yeon ; Bae, Tae-Suk ; Kim, Sang-Wan ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 5, 2013, Pages 375~384
DOI : 10.7848/ksgpc.2013.31.5.375
Most of regions within the city of Mokpo, located on the southwest coast of the Korean Peninsula, are subjected to significant subsidence because about 70% of the city is land reclaimed from the sea (Kim et al., 2005). In this study, we aimed to estimate the rate of subsidence over Mokpo by using PALSAR L-band dataset from 2006 to 2010. Time series analysis was performed as well using GPS surveying data from 2010 to 2012. Results from these two independent datasets are then compared and analyzed over the common period of time. GPS data processing provides the results of seasonal variation on the surface, that is, via repeatedly rising and falling in association with the periodic cycle. Therefore, a time series analysis was performed to calculate the rate of ground subsidence. The deformation rates calculated for the same point are 3.89cm/yr and 2.65cm/yr from the GPS data and SAR data, respectively. SAR and GPS data processing results show a very similar pattern in terms of magnitude of annual subsidence. Thus, if the two datasets are integrated together, new modeling on ground subsidence is feasible. Lastly, subsidence was detected in a landfill area in the city of Mokpo, which has been continuously occurring through 2012.
Design of the bicycle road networks concerning the bicycle users' purposes
Lee, Jeabin ; Huh, Yong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 5, 2013, Pages 385~391
DOI : 10.7848/ksgpc.2013.31.5.385
As a solution for environmental problems caused by increasing number of vehicles, it is encouraged to use a bicycle as an environment-friendly transportation method. To vitalize the bicycle usage, it is a necessary to construct bicycle roads that are safe and suitable for users. Based on the previous research results, we assume the main purposes of bicycle usages are mainly local leisure activity and school commuting. Thus, the proposed method finds the shortest link between the existing bicycle road network and bicycle usage facilities such as leisure activity places or schools over public road network. Then, we carry out the RTK DGPS survey for the candidate links, and analyze the slopes of them. When the slope of a found link is larger than a threshold, an alternative link is re-found for the safety and convenience of a bicycle user. The proposed method is applied to the real bicycle road network in Mokpo, Chunnam and the results are discussed.
A Study on Flood Area Typology Using the Inundation Trace Map - A Case Study of Busan Metropolitan City -
Yoo, Chang ; Hong, Soon Heon ; Choi, Hyun ; Nam, Kwang Woo ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 5, 2013, Pages 393~400
DOI : 10.7848/ksgpc.2013.31.5.393
Recently, expected casuality or property damage, such as flood damage, environmental destruction, etc, is increased because of the local heavy rain or flood by climatic changes. Especially, there are lots of property damages caused by increase of flood frequency and expansion of flood area because impervious rate is increased by urban sprawling development. Therefore, this research intends to analyze reasons of flood damage by each form and suggest protective measures through the typology of flood area for Haeundae-gu, Suyoung-gu, Saha-gu in Busan Metropolitan City with Busan's inundation trace map which has made from 2009. To achieve them, flood area was divided into water flooding type, river flooding type and seawater flooding type. And, protective measures focusing on previous prevention gave the relationship by dividing into managing system aspect, infrastructure building aspect and system aspect, so it approached flooding problems more objectively and scientifically. And, this research intends to suggest vitalizing measures for the utilization of inundation trace map in the future.
Monitoring Management Plan for Changed Region with respect to Revision Periods
Han, You Kyung ; Yeom, Jun Ho ; Kim, Yong Il ; Lee, Byoung Kil ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 5, 2013, Pages 401~410
DOI : 10.7848/ksgpc.2013.31.5.401
Due to the increasing need for spatial information, there have been a lot of research related with monitoring and revision of changed regions for the acquisition of the accurate and latest information. In this paper, the optimal monitoring management plan for changed regions with respect to the revision periods was proposed. For this purpose, the representative monitoring methods, which are based on database, professional manpower and crowdsourcing of continuous revision, and aerial imagery, satellite imagery and LiDAR of cyclic revision, were investigated. Then, the properties and application status of monitoring systems in Korea were illustrated according to the methods. Finally, the optimal monitoring management plan for continuous and cyclic revisions was suggested through the comparison of properties and revisionable objects of each method. From the result, it was shown to be appropriate for the optimal monitoring management plan of continuous revision as using Internet-Architectural Information System (e-AIS) database cooperated with professional manpower and crowdsourcing, and cyclic revision as using domestic high-resolution satellite images and LiDAR data processed semi-automatically.
Graph Topology Design for Generating Building Database and Implementation of Pattern Matching
Choi, Hyo-Seok ; Yom, Jae-Hong ; Lee, Dong-Cheon ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 5, 2013, Pages 411~419
DOI : 10.7848/ksgpc.2013.31.5.411
Research on developing algorithms for building modeling such as extracting outlines of the buildings and segmenting patches of the roofs using aerial images or LiDAR data are active. However, utilizing information from the building model is not well implemented yet. This study aims to propose a scheme for search identical or similar shape of buildings by utilizing graph topology pattern matching under the assumptions: (1) Buildings were modeled beforehand using imagery or LiDAR data, or (2) 3D building data from digital maps are available. Side walls, segmented roofs and footprints were represented as nodes, and relationships among the nodes were defined using graph topology. Topology graph database was generated and pattern matching was performed with buildings of various shapes. The results show that efficiency of the proposed method in terms of reliability of matching and database structure. In addition, flexibility in the search was achieved by altering conditions for the pattern matching. Furthermore, topology graph representation could be used as scale and rotation invariant shape descriptor.
Impact of Tropospheric Delays on the GPS Positioning with Double-difference Observables
Hong, Chang-Ki ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 31, issue 5, 2013, Pages 421~427
DOI : 10.7848/ksgpc.2013.31.5.421
In general, it can be assumed that the tropospheric effect are removed through double-differencing technique in short-baseline GPS data processing. This means that the high-accuracy positioning can be obtained because various error sources can be eliminated and the number of unknown can be decreased in the adjustment computation procedure. As a consequence, short-baseline data processing is widely used in the fields such as deformation monitoring which require precise positioning. However, short-baseline data processing is limited to achieve high positioning accuracy when the height difference between the reference and the rover station is significant. In this study, the effects of tropospheric delays on the determination of short-baseline is analyzed, which depends on the orientation of baseline. The GPS measurements which include tropospheric effect and measurement noises are generated by simulation, and then rover coordinates are computed by short-baseline data processing technique. The residuals of rover coordinates are analyzed to interpret the tropospheric effect on the positioning. The results show that the magnitudes of the biases in the coordinate residuals increase as the baseline length gets longer. The increasing rate is computed as 0.07cm per meter in baseline length. Therefore, the tropospheric effects should be carefully considered in short-baseline data processing when the significant height difference between the reference and rover is observed.