Mosaic:
The resulting geo-referenced images were then mosaicked using ArcGIS 9.3 and resampled to 3.5m (Figure 12). The resulting raster - when displayed semi-opaque over the hillshaded DEM with river, road and lake vector layers (Figure 13) – served as an excellent visual reference and source of X,Y coordinates for subsequent ground control point (GCP) collection process using ERDAS Imagine 2010 software.