Orthorectification is an essential process in any photogrammetric project because, after processing, you can relate features to their actual locations on Earth. It also provides a means for you to take accurate measurements.
Orthorectification is the process of using a rigorous math model and a digital elevation model (DEM) to correct distortions in raw images. The quality of the orthorectified image is related directly to the quality of the rigorous math model and the DEM. A poorly computed math model, an inaccurate DEM, or a DEM georeferenced incorrectly to the math model will cause errors in the orthorectified images.
Producing image mosaics and performing pansharpening on images both require orthorectified image products. The multispectral imagery must align perfectly with the panchromatic imagery to produce a high-quality pansharpened or mosaic image product.
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