GIS Test Data

Introduction Geographic Information Systems (GIS) handle objects embedded in the space. Digital satellite imagery, scanned aerial photos, elevation models and scanned maps are typical sources of geographic data sets. Graphics data is traditionally divided into two classes: vector data and raster data which is also called bitmap data. Vector data consists of points, lines, arcs and areas with topographic information associated. Often vector data sets are classified according to the data they contain. Typical classes are boundaries of states, rivers, buildings and vegetation. Raster data are a collection of pixels, organized in a series of rows. Although many organizations try to create a unique vector format and a unique raster format, up to now each country uses its own format. For an overview of the spatial data standards around the world see: http://ncl.sbs.ohio-state.edu/ica/3 spatial.html This web page is pro