ATCOR Workflow for Imagine - FAQ

On request, we give out a free trial version that is limited to 15 days of usage.

For ATCOR workflow für Imagine the system requirements for Octave Imagine are valid. ATCOR workflow for Imagine needs a running Octave Imagine license (Minimum: Imagine Essentials) and is available for PC systems only. In order to use the spatial model operators for customized image analysis process chains, an Imagine Professional is needed. For using ATCOR workflow for Imagine as unattended batch process, an extra commercial IDL license is needed.

ATCOR workflow for Imagine includes both ATCOR-2 and ATCOR-3. According to the type of region and available data sets, you choose the appropriate module. ATCOR-2 is the version of choice if the terrain covered by the imagery to be calibrated is almost flat or if a proper Digital Elevation Model (DEM) is not available. ATCOR-2 can also be used for fast checks and preliminary testing. For non-flat areas ATCOR-3 is recommended. For ATCOR-3 a DEM is required.

The pixel size of the DEM should be at least the pixel size of the image you want to process. The more rugged the terrain, the higher the spatial resolution of the DEM should be.

No, ATCOR requires the original spectral information as collected by the sensor. Pan-Sharpening is an irreversible process. The original information, i.e. at-sensor radiance, cannot be restored. So the retrieval of surface reflectance would fail. The same applies to image data that were modified by Dynamic Range Adjustment (DRA). Only linear spectral transformations are allowed provided that the transformation parameters are known. These transformation parameters have to be considered via the calibration file used as input for ATCOR.

Currently, you can atmospherically correct images of panchromatic and multispectral sensors with ATCOR workflow for Imagine.