Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Geometric Correction


Preparing WorldView2 Imagery for Map Updating Projects – Aldjyl/ Aleibayiji (Iraq/ North Baghdad) as a Case Study

Oday Z. Jasim; Mohammed M. Salih; Ahmed A. Luaibi

Engineering and Technology Journal, 2021, Volume 39, Issue 12, Pages 1828-1836
DOI: 10.30684/etj.v39i12.1499

In the presented study, a WorldView2 WV2 satellite image has been prepared to be used in map updating projects. The performed operations can be classified into two categories, the first category includes pansharpening methods for creating a new 8- spectral bands of WV2 Imagery, each one of them has a 0.5-meter spatial resolution. The Pansharpening technique has been implemented with four different approaches, i.e. (Principal Components PC, Wavelet Transform WT, Hyperspherical Color Space HCS, and High Pass Filtering HPF). For these four methods and based on a visual comparison among the quality of the resulting images (with respect to the original Multi-spectral Worldview2 MS-WV2 image), the HCS image has been determined as the best one of them. Because of the high-security situation of the study area, and the impossibility of using the Global Positioning System GPS and other surveying devices there, the Controlled Image Based CIB of 1-meter resolution has been depended on as a source of reference Ground Control Points GCPs. Initially, set GCPs and Check Points are determined on both the HCS Pansharpened image and the CIB image. For maintaining the linearity of the geometric distortion within WV2 original image, the 1st order polynomial transformation model has been selected to perform the geometric correction process. It is clearly concluded that the resulted Root Mean Square Error RMSE of the geometric correction process is acceptable for a wide range of mapping applications. Moreover, the resulting geometrically corrected pan-sharpened WV2 image can be utilized for increasing the interpretation capability of the land features by giving more false color displaying options, and finally supporting the related map updating projects.

Registration of Satellite Images by Using the Linear Transformations

Intehaa Abd-Allah M. Al-Juboury

Engineering and Technology Journal, 2012, Volume 30, Issue 1, Pages 175-188

The processes of rectification and registration that conducted at the satellite
images of the most important steps in images interpretation and extract information
for use in various applications of remote sensing. There are things that must be
observed before entering into the details of the operation. There are a number of
important factors that must be considered. Such as the illumination angle, Sun-
Earth distance varies throughout the year. In addition to the effects of
environmental, climatic and weather such as cloud, haze, dusty weather, cover for
one of the dates, that affect the nature of the scene this requires effort and extra
work for the interpretation of these satellite images after removing the mistakes in
them when captured by the satellite. The first process applied to the satellite image
is the Pre-Processing process, and which includes radiometric and geometric
corrections.
In this paper, image to map registration method, of 1st order transform, has
been performed to correct the SPOT image from geometric errors using geoimage
of “UTM” projection. The total RMS error, which has been reached, was less than
one meter,. The results were obtained using the ready program (ENVI).