ABSTRACT FINDING THE MOST OPTIMUM SOLUTION FOR THE NATIONAL LARGE SCALE BASE MAPPING PROGRAM IN INDONESIA Large scale base mapping up to 1:1,000 scale is a program mandated by the new law on geospatial information in Indonesia. This is a challenging task considering that Indonesia covers more than 1.8 million km2 land area, equivalent to more than 91,000 map sheets at 1:10,000 scale or more than 360,000 map sheets at 1:5,000 scale. The most optimum strategy must be chosen starting with determination of priority areas to be mapped at a certain scale. Further, selection of technology used is also intriguing as different terrain conditions should be mapped. Especially, the most optimum technology that produces height information satisfying the required technical specification must be chosen carefully. This policy paper describes the national large scale base mapping program in Indonesia and the strategy to implement it. Priority areas to be mapped in the following 5 years are determined based on different parameters such as population density, economic growth, local specific needs such as detailed spatial planning, and available budget from both central and local governments. The result of this year large scale mapping project conducted using a combination of aerial (digital) photogrammetry and LIDAR is analyzed, both from technological and project management perspective. The difficulties faced during data collection and data processing stage are highlighted. Recommendation from this analysis forms the base for adjusting the program in the future.
ABSTRACT Accuracy Analysis of Measurement of Vehicle Speed Using Overlapping Aerial Photographs Vehicle speed is a basic measure of traffic performance. It is considered as one of the most important factors in all modes of transportation. Conventional methods of vehicle speed determination are ground-based sensors including radar detection and global positioning systems. A photogrammetric approach for vehicle speed determination has also been suggested. This is based on a pair of overlapping aerial photographs on which two images of the vehicle are exposed by an aerial camera at a certain time interval.In this paper, the methodology is described and factors affecting the obtained vehicle speed accuracy are discussed and analyzed. Theoretical analysis showed that the most effective factor is the accuracy of measuring time interval between exposures and distance moved by the vehicle on the photograph, followed by car speed, air base and photo scale. For high accuracy determination of vehicle speed the photography should be of large scale (low flying height, normal angle camera), long air base, highly accurately determined time interval between exposures and measurement of the distance moved on the photograph.