EVALUASI KETELITIAN GEOMETRIK PETA ORTOFOTO (Studi Kasus Sebagian Proyek Pemetaan Gunung Merapi Yogyakarta)
| Main Authors: | , JALI OCTARIADY, , Ir. Djurdjani MSP., M.Eng., Ph.D |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2013
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/121739/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=61838 |
Daftar Isi:
- Measurements using Airborne Laser Scanning (ALS) is one way to produce geospatial data quickly. This method has advantages in terms of rapid data acquisition time and high accuracy measurement results. However, ALS only produces point cloud data not image of the object. Combination of aerial photo exposed using medium format camera and point cloud data can provide orthophoto map. Orthophoto map�s quality can be determined using quality control by accuracy test. This accuracy test consists of two objects, namely radiometric accuracy test and geometric accuracy test. This research aims to evaluate the geometric accuracy, on the slope area and flat area. Materials used in this research is four tiles orthophoto and three tiles contour. The tiles covered Purwobinangun area and Universitas Gadjah Mada area . This data was obtained from the Department of Geodetic Engineering UGM. Overall study area are 7,60932 km2. The research begins by determining the test line on the orthophoto for 80 points. The identified test lines were then measured directly on the field and on the orthophoto map. Distances and height differences observed on the orthophoto map were compared to those observed on the field. To avoid blunder data, statistical test was implemented. RMSE then was computed and compared to the NSSDA standard accuracy. The result shows that the distance accuracy for the flat area and slope area are 17,69 cm and 21,79 cm, while the height differences accuracy for the flat area and slope area are 14,98 cm and 16,32 cm. According to NSSDA standard accuracy, these accuracy can produce contour interval two feet (60 cm). It means that the appropriate scale of orthophoto map is 1 :1200. Scale 1 : 1200 is generated on the basis of dimensional accuracy not positional accuracy. Orthophoto maps with a scale of 1: 1200 were used in this study can be used for spatial planning and base map for land registration. It can also be used for boundary making for the village.