| (Data) Product |
An object that contains remote sensing data for a well known scene on the earth.
Within BEAM, a product can contain meta-data, geo-coding information, tie-point grids and bands.
All band raster datasets within a product have the same pixel resolution and share the same
geo-coding.
|
| Band |
A spectral or geophysical raster dataset of a product. The band's sample values are usually the
measurements of a sensor.
|
| Tie-point grid |
An auxiliary (geophysical) raster dataset of a product. Tie-point grids usually provide less sample values
than a band. Missing values, with respect to the full pixel resolution of a product, are obtained by a
linear interpolation. The tie-point grid data does normally not originate from the sensor which provided
the product's measurement data.
|
| Geometry |
A geometric shape (point, line, polyline or polygon). Geometries can be drawn on a scene view.
|
| Mask |
Marks a regions of raster dataset. Masks can be derived from an expressions, a value range or a geometry.
|
| Flag-Dataset |
A special band type which contains quality flag information. Flag datasets
always have an unsigned integer data type (8 to 32 bit). Each bit in a sample
corresponds to a special flag value. Each flag's metadata is stored in a
corresponding flag coding object. |
| Flag-Coding |
Flag codings are used to specify the bit positions of single flags within a integer sample value
of a quality flags dataset. Each element in a flag coding provides the metadata for a flag such as
the name, description and a bit-index.
|
| Index-Coding |
Index codings are used for classification bands. It maps a sample value of the band to a class by using the value as index.
Each element in an index coding provides the metadata for a class such as the name, description and the index.
|
| Geo-Coding |
Provides the geodetic co-ordinates for a given pixel of a product.
An image is geo-coded if it is somehow possible to find the geographical latitude and longitude values for
any pixel.
ENVISAT products store their geo-coding information in the tie-point grids
named latitude and longitue. If a product has been map transformed,
it is known to be geo-referenced and as such, tie-point information is no longer required.
|
| Geo-Reference |
An image is geo-referenced, if any point in the image can be found in a corresponding reference
map by a linear transformation. Every pixel in the image has the same size if expressed in map units.
Geo-referencing a
geo-coded image includes image warping, applying a well known map projection and pixel re-sampling.
|
| Map |
Graphic representation of the physical features (natural, artificial, or both) of a part or the whole of the
Earth's surface, by means of signs and symbols or photographic imagery, at an established scale, on a
specified
projection, and with the means of orientation indicated.
|
| Map Projection |
Orderly system of lines on a plane representing a corresponding system of
imaginary lines on an adopted terrestrial or celestial datum surface. Also,
the mathematical concept for such a system. For maps of the Earth, a projection
consists of a graticule of lines representing parallels of latitude and
meridians of longitude or a grid. |
| Graticule |
Network of parallels and meridians on a map or chart. A geographic graticule is a system of coordinates of
latitude and longitude used to define the position of a point on the surface of the Earth with respect to
the
reference ellipsoid.
|
| Grid |
In connection with maps: a network of uniformly spaced parallel lines intersecting at right angles.
When superimposed on a map, it usually carries the name of the projection used for the map that is,
Lambert grid,
transverse Mercator grid, universal transverse Mercator grid.
|
| Pixel coordinates |
In the BEAM software, pixel values always refer to the upper
left corner of the pixel. Pixel co-ordinates are always zero based, the pixel at X=0,Y=0 refers
to the upper left
pixel of an image and the upper left corner of that pixel.
|
| Pixel value |
In general a composite of red, green and blue sample values resulting in a colour as part of an
image.
Within the BEAM software, often synonymously referred to as the single, geophysical sample value of a band
or tie-point grid.
|
| Geodetic co-ordinates |
Geodetic co-ordinates are given as latitude and longitude values and always refer -
if not otherwise stated - to the WGS-84 ellipsoid.
The geodetic co-ordinates of a pixel, always refer to the upper left corner of the pixel.
|
| AATSR | Advanced Along Track Scanning Radiometer |
| ADS | Annotation Data Set in an ENVISAT data product |
| ASAR | Advanced Synthetic Aperture Radar |
| BEAM | Acronym for Basic ENVISAT Toolbox for (A)ATSR and MERIS |
| COTS | Commercial Off-The-Shelf Software |
| CSV | Character Separated Value |
| ECSS | European Co-operation for Space Standardisation (documents available at ESTEC at the
Requirements and Standards Division) |
| EnviView | Software developed at ESTEC to visualise and analyse the Envisat data. See User services
section at http://envisat.esa.int/ |
| EO | Earth Observation |
| ESA | European Space Agency (see http://www.esa.it/export/esaCP/index.html) |
| ESRI | Environmental Systems Research Institute (see http://www.esri.com) |
| ESRIN | European Space Research Institute (see http://www.esa.it/export/esaCP/index.html) |
| ESTEC | European Space Research and Technology Centre (see
http://www.esa.it/export/esaCP/index.html) |
| ENVISAT | ESA satellite (see http://envisat.esa.int/) |
| GADS | Global Annotation Data Set in an ENVISAT data product |
| HDF | Hierarchical Data Format (see http://www.hdfinfo.com/) |
| HDF-EOS | Extended HDF format (see http://ecsinfo.gsfc.nasa.gov/iteams/HDF-EOS/HDF-EOS.html) |
| MATBX | BEAM's former project name |
| MDS | Measurement Data Set in an ENVISAT data product |
| MERIS | Medium Resolution Imaging Spectrometer Instrument (see http://envisat.esa.int/) |
| MERMAID | MERis MAtchup In-situ Database (see http://hermes.acri.fr/mermaid/home/home.php) |
| MODIS | Moderate Resolution Imaging Spectroradiometer (see http://modis.gsfc.nasa.gov/MODIS/) |
| MPH | Main Product Header in an ENVISAT data product |
| OSSD | Open Source Software Development |
| OBPG | Ocean Biology Processing Group (OBPG) of NASA (see http://oceancolor.gsfc.nasa.gov/) |
| SAR | Synthetic Aperture Radar (http://earth.esa.int) |
| SeaDAS | SeaWiFS Data Analysis System (see http://seadas.gsfc.nasa.gov/) |
| SeaWiFS | Sea-viewing Wide Field-of-view Sensor (see http://seawifs.gsfc.nasa.gov/) |
| SPH | Specific Product Header in an ENVISAT data product |
| SW | Software |
