Should I Reproject Before Mosaicking Imagery?

The best workflow is to perform the mosaicking and reprojection at the same time, as this will prevent artifacts from occurring between tiles in most situations.

However, if the input images are in different coordinate systems, GeoExpress automatically reprojects each input tile to the output coordinate system before the mosaic, which may result in artifacts between tiles. In this case, you should re-project the images before you mosaic them.

About GeoExpress

GeoExpress is a high-performance geospatial image compression program designed to allow huge raster datasets to be compressed with a minimum loss in quality. Based on the cutting-edge MrSID technology, GeoExpress provides GIS professionals, mapping companies, drone service providers, remote sensing professionals, and government organizations with an effective way to compress, handle, and distribute aerial, satellite, orthophoto, DEM, and scanned images. The advantages of GeoExpress include minimizing the amount of storage space needed to store geospatial images and speeding up their transfer. An extensive range of raster file formats is supported by GeoExpress, and the program integrates seamlessly into other GIS tools, lending itself to enterprise-level management of geospatial data.

GeoExpress may be employed for processing drone images, high-resolution aerial photographs, or even data obtained through large mapping projects.