Arc GIS | Geographic Information System ( GIS) softwareA |
ASTER | Advanced Spaceborne Thermal Emission and Reflection Radiometer |
ATCOR | Atmospheric/Topographic Correction software |
Atmospheric correction | The correction made to remotely sensed radiance to account for effects related to the intervening atmosphere between the earth's surface and the satellite. |
BNSC | British National Space Centre |
Boolean | A system of logic/algebraic processes ( e.g., AND, OR) |
CASI | Compact Airborne Spectrographic Imager |
Confusion matrices | A matrix that displays statistics for assessing image classification accuracy by showing the degree of misclassification among classes. |
Definiens AG | A German-based company producing Definiens Developer software |
Definiens Developer
(eCognition) | Graphical user interface for developing Definiens processes |
DEM | Digital Elevation Model |
DTM | Digital Terrain Model |
Endmember | Spectra associated with the pure samples of surface materials ( e.g., vegetation). |
EO | Earth Observation |
Fuzzy membership function | A mathematical function that defines the degree of an elements membership in a fuzzy set |
GIFTSS | Government Information From The Space Sector |
GIS | Geographic Information System |
HRG | High Resolution Geometric |
IRS | Indian Remote Sensing Satellite |
Kappa coefficient | A statistical measure of the agreement, beyond chance, between two maps ( e.g. map of classification and ground truthed map) |
Linear spectral unmixing | The process of extracting the proportions of surface materials from spectrally mixed image pixels based on knowledge of pure spectra (endmembers) |
NDVI | Normalized Difference Vegetation Index |
NIR | Near infrared |
Orthorectification | A process of geometric referencing of an image to a map coordinate system that considers variations in the topography of the earth surface and the tilt of the satellite sensor. |
Pre-processing | Ortho, atmospheric, topographic and other corrections to prepare imagery for classification. |
Radiance calibration | Conversion of satellite image digital numbers to radiance. |
Segmentation | Grouping of pixels based on similar values - a type of automated vectorisation (digitising). |
Server engines | The components of Definiens software accessible over a network. |
Shapefile | A set of files used by ESRI Arcmap the contains points, arcs or polygons holding tabular data and spatial information |
SPOT | A French satellite supporting the HRG sensor |
SWIR | Short Wave Infrared |
Topographic shadowing | Shadowing of a surface by the surrounding topographic relief and as a function of solar angle. |