[轉]ArcIMS 中地圖座標參考設定（ArcGIS Unknown Spatial Reference）

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“ArcGIS Unknown Spatial Reference”問題： 
shp檔案在Arcgis開啟後經常因為原有座標系無法識別而丟失資訊，出現以下提示資訊： 
"Unknown Spatial Reference 
The following data sources you added are missing spatial reference information. This data can be drawn in ArcMap, but cannot be projected." 

  解決辦法： 
  ArcToolBox > Data Management Tools > Projections and Transformations > Define Projection，這裡要給檔案加入的座標系統應當是地理座標系統（Geographyical Coordinate System），下一步再將投影轉換到你所要的投影系統下。 




ESRI Supporter Center關於這個問題給出的解決方案： 

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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 have the coordinate system or projection defined displays the following error message: 
"Unknown Spatial Reference 
The following data sources you added are missing spatial reference information. This data can be drawn in ArcMap, but cannot be projected." 


Cause 

The data does not have a coordinate system or projection defined. 
This message is returned for all data types which can be added to ArcMap including geodatabase feature classes, shapefiles, coverages and CAD data, as well as supported raster or image formats which do not have a coordinate system definition. 


Solution or Workaround 

Identify and define the coordinate system for the data, using the Define Projection Tool in ArcToolBox > Data Management Tools > Projections and Transformations or the data‘s property page in ArcCatalog. 
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原地址：http://miss4813.iteye.com/blog/772423

[轉]ArcIMS 中地圖座標參考設定（ArcGIS Unknown Spatial Reference）