Development of Pushbroom Airborne Camera System Using Multispectrum Line Scan Industrial Camera

Abstract

Abstract.One of the steps on mastery the remote sensing technology (inderaja) for satellite was the development of aerial camera prototype that could be an alternative for LAPAN light cargo aircraft mission (LAPAN Surveillance Aircraft, LSA-01). This system was expected could be operated to fulfill the emptiness or change the remote sensing data of optical satellite as the observer of vegetation covered by cloud. On this research, it was developed a prototype of pushbroom airborne camera 4-channels spectrum with very high resolution that worked on wavelength range seem near infra-red/ NIR used simple components that were available in the commercial market (commercial off-the-shelf/ COTS components). This research also developed georeference imagery software module used method of direct georeference rigorous model that had been applied on SPOT satellite. For this one, it was installed supported sensory for GPS and IMU as the writer of location coordinate and camera behavior while doing the imagery exposure or acquisition. The testing result gave confirmation that COTS components, such as industry camera LQ-200CL, and lower class GPS and IMU could be integrated became a cheaper remote sensing system, which its imagery product could be corrected systematically. The corrected data product showed images with GSD 0.4m still had positioning mistakes on average 157m (400 pixel) from the original position on GoogleEarth. On spectroradiomatic aspect, the used camera had much higher sensitivity of NIR channel than the lookedchannel so it caused bored faster. On the future, this system needed to be fixed by increasing the rate of GPS/ IMU data updates, and increased enough time resolution system so that the synchronization process and the availability supported data for completing more accurate georeference process.Besides, the sensitivity of NIR channel needed to be lower down to make it balance to the lookedchannel.

Simulation of Direct Georeferencing for Geometric Systematic Correction on Lsa Pushbroom Imager

“…Since the detector is only a cell array or detector pixels that form a straight line, then the image is only in the form of a picture line elements which has very small width, so that it can be regarded as one-dimensional image. 2 dimensional (2D) in pushbroom imager is only formed if the camera is shifted regularly when the camera takes images in accordance to the width of each line of the image as shown in Figure 2 In remote sensing satellites system, satellites with pushbroom sensors shoot hundreds to thousands with set range times and adapted to flying speed of the satellite relative to the Earth and with specified line width size of the image (spatial resolution) (Maryanto 2016).…”

“…Georeferencing process was an early necessary stage in remote sensing image geometric correction process to generate encoded data or image to a map (geocoded image). To get onto this stage, resampling process has to be done, which was not discussed in this paper (Maryanto 2016).…”

“…For example, cameras in non-active mode mounted on the satellites, and formulate an appropriate geometric transformation of the camera reference system to the system, so that it can be defined as the vector viewpoint according to the system (satellite). Furthermore, it was done over and over in the same steps to connect satellite systems with Earth, so that the end out of orientation system was obtained in the Earth reference system (Maryanto, 2016).…”