"ArcGIS Unknown Spatial Reference" issue:
shp files often lose information after ArcGIS is opened because the original coordinate system is not recognized, and the following message appears:
"Unknown Spatial Reference
The following data sources you added is missing spatial reference information. This data can is drawn in ArcMap, but cannot is projected. "
Workaround:
ArcToolBox > Data Management Tools > Projections and Transformations > Define Projection, the coordinate system to be added to the file should be a geographic Coordinate systems (geographyical coordinate system), the next step is to convert the projection to the projection system you want.
ESRI Supporter Center's workaround for this issue:
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Error:unknown Spatial Reference
article id:31999
Software:arcgis-arceditor 9.0, 9.1, 9.2 arcgis-arcinfo 9.0, 9.1, 9.2 arcgis-arcview 9.0, 9.1, 9.2
platforms:n/a
Error Message
Adding data to ArcMap which does not has the coordinate system or projection defined displays the following error MES Sage:
"Unknown Spatial Reference
The following data sources you added is missing spatial reference information. This data can is drawn in ArcMap, but cannot is projected. "
cause
The data does not has a coordinate system or projection defined.
This message was returned for all data types which can be added to ArcMap including Geodatabase feature classes, SHAPEF Iles, coverages and CAD data, as well as supported raster or image formats which does not have a coordinate system definitio N.
solution or Workaround
Identify and define the coordinate system for the data, using the Define Projection Tool in ArcToolBox > Data manag Ement Tools > Projections and transformations or the data ' s property page in ArcCatalog.
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Original address: http://miss4813.iteye.com/blog/772423
Go Map coordinate reference settings in ArcIMS (ArcGIS Unknown Spatial Reference)
