Digital shy maps

Fingerprinting digital elevation maps

Digital elevation maps (DEMs) provide a digital representation of 3-D terrain information. In civilian applications, high-precision DEMs carry a high commercial value owing to the large amount of effort in acquiring them; and in military applications, DEMs are often used to represent critical geospatial information in sensitive operations. These call for new technologies to prevent unauthorized...

Once bitten, twice shy.

Maps’ Scale in Digital Cartography

The meaning of map scale increases in the digital environment, despite the fact that the maps can be visualized in different map scales. Three kinds of map scales are examined, which are relatively independent of the maps, visualized on the display:  Scale of the map field space – the current map scale, visualized on the screen.  Scale of the map content, which defines:  Particularity of the...

Are Galaxies Shy ?

Until 1996, there was little evidence that most galaxies were “shy”, i.e. that they would hide their stars behind a veil of dust and turn red when forming stars, radiating the bulk of their luminosity in the infrared (IR) at a given epoch of their history. Ten years before, IRAS had unveiled a population of luminous IR galaxies exhibiting such a “shy” behavior, the so-called LIGs and ULIGs (wit...

[Shy-Drager syndrome].