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You are quite correct that the raster should be georeffed into its real projected system. But if you have a graticule on the map marked in GCS you can enter these cords directly. After clicking on the "from" point using the GeoRef toolbar, if you right click, it gives you the opportunity to type in the known coords of the point in DMS or DD, these locations are then immediately projected into the PCS units, and will appear in the link table as metres or whatever it is. This is particularly useful when georeffing scanned map sheets where the corners are usually marked in Lat/Long but the map is UTM or whatever. Good luck, Neil Thanks a lot Neil,. That works perfectly,.
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05-26-2014
10:46 PM
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I have raster displaying Lat/ Long grid, but map information shows that, it s been mapped in Gauss Krugger projetion/ Beijing 1954. So, technically we need to geo reference the map in Gauss Krugger/ Beigjing 1954 Projectec Coordinated System in ArcGIS. So, basically what I need to do is, georeference raster by input of Lat/Long, but need to update the georeferencing by projected coordinated system mentioned above. In Global mapper, we can load the raster and enter Lat/Long available in the map, straight away it will be recalculated to Projected coordinated system. Can we get anything same in ArcGIS?
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05-22-2014
06:22 AM
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I have rasters, need to be geo-referenced in WGS 84 datum with Lat/Log (degree). I have geo-referenced using Global Mapper, which we usually used to use, because of its user friendly. Got a vector data of the same raster through other sources, which also used GCS_WGS 84 (Could have been geo-referenced using ArcGIS with GCS_WGS84). When I overlap both the data, found off-set about 300 meters. Checked all data origins and geo-referencing, everything correct, still off-set unavoidable. To check further, I have geo-referenced same raster with GCS_WGS84 in Global Mapper and ArcGIS seperately. I found the same off-set of 300m. Is that really different transformation applied in difference platforms, or any other parameters related to this??
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05-08-2014
02:33 AM
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