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| Why aren't my two images lining up correctly? |
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It sounds like the two images are calibrated or georeferenced slightly differently. It could be that one was simple calibrated differently than the other (using a different projection, projection setting, or datum), or maybe one was calibrated incorrectly or not very precisely. If you calibrated one (or both) of the images in a raster project in Didger 3, be sure you warp the image (Image | Warp Image) before exporting it to a GeoTIFF.You can open each image up by itself in a raster project and confirm that the calibration settings are exactly same for both images. If they are, note the coordinates of a common point on both bitmaps. If the coordinates are not the same, then the images aren't going to line up when you import them both into a vector project. You might need to recalibrate one to match the other.
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