keratoconus is a non-inflammatory, progressive thinning process of the cornea. it is a relatively common disorder of unknown etiology that can involve each layer of the cornea and often leads to high myopia and astigmatism. computer- assisted corneal topography devices are valuable diagnostic tools for the diagnosis of subclinical keratoconus and for tracking the progression of the disease. the...

Visualizing large data by the SOM and GTM methods – what are we obtaining? Anna Bartkowiak University of Wrocław, Institute of Computer Science, Przesmyckiego 20, Wrocław 51–151, PL Abstract We consider the visualization of multivariate data yielded by the SOM and the GTM methods. Special emphasis is put on the position of outliers and extreme points. When evaluating four data sets, it is found...

As one of the world’s oldest continents, Australia has experienced a complicated geological and geomorphological history. As such, the gravity field of Australia behaves differently to that reported in other countries. This paper investigates the relative roughness of three types of gravity anomaly (freeair, refined Bouguer and topographic-isostatic) using statistical and graphical comparisons,...

Correction of corneal astigmatism is a key element of cataract surgery, since post-surgical residual astigmatism can compromise the patient's uncorrected visual acuity. Toric intraocular lenses (IOLs) compensate for corneal astigmatism at the time of surgery, correcting ocular astigmatism. They are a predictable treatment. However, accurate measurement of corneal astigmatism is mandatory for ch...

(1993). Topographic normalization of TM scenes through the use of an atmospheric correction method and digital terrain models. A computer graphics based model for scattering from objects of arbitrary shapes in the optical region. Correction of atmospheric and topo-graphic effects for high spatial resolution satellite imagery. Fig. 2: a) Geocorrected Landsat-TM image from April 26th of the Davos...

The intensity information from terrestrial laser scanners (TLS) has become an important object of study in recent years, and there are an increasing number of applications that would benefit from the addition of calibrated intensity data to the topographic information. In this paper, we study the range and incidence angle effects on the intensity measurements and search for practical correction...

* Corresponding author. Abstract – Earth Observation (EO) data in combination with environmental data enables the extraction of important information for environmental management. There is a strong need in standardized and quality controlled data sets and reliable data analysis routines. Recent developments and established work flows at German Aerospace Center (DLR) include standardized pre-pro...