I have a similar problem. Using Global Mapper, I created a simple shapefile having 9 adjacent shapes laid out in a rectangle. I used this layer to clip aerial imagery to the boundaries of each feature in the shapefile using Global mapper. the clipped shapes are exactly coincident with the polygon edges. When I import both the shapefile and cllipped images into ArcMap V10.2, the shapes and imagery become offset approximately 1.5 meters. Also, The latlong of a known point in the polygon/imagery overlap in ArcMap is hundreds of meters offset from the lat/long of the same point in Global mapper. Also when I load the data in QGIS the layers are all conincident, only when I load into Arc10 are they not coincident. In global Mapper the projections are: shapefile: WGS84 - lambert Conformal -Washington State Plane South -feet (US Survey) Imagery: WGS84 - Geographic ( lat/long) - Arc Degrees EPSG Code 4326 (obviously not Wash State Plane-South) Problem 1: How do I correct this overlap to achieve coincident data in ArcMap? Problem 2: In Arcmap I went into Catalog image file/properties and changed the image projection to State Plane South - the image file then disappeared from the screen and would not display. reset the original projection and it re appeared. Thanks Glenn
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