[GIS] Creating spatial Reference to ASCII file

arcgis-10.1arcgis-desktopasciimaxentraster

I have produced ASCII files in MaxEnt. These files are able to be loaded into Arcmap10.1 and display as an image, but I cannot interpret them or create them into a polygon for further analysis. I have read some forums that say I need to add spatial reference and calculate statistics (http://gis.utah.gov/wp-content/uploads/ASCII_Elevation_Data.doc) but when I do this to the original file and then import it will not create the resulting raster into a polygon, stating that "The environmental window is ignored"

Ideally, I need to add all the different environmental considerations to the ASCII file and then import it as a raster. This will allow me to analyse it and then create a polygon of the extent of the layer i am looking at.

Can anyone suggest a series of steps to overcome this and produce a raster and then a polygon?

Best Answer

I suppose you did these 2 steps correctly:

1- calculate the statistics of the .asc file.

2- set the spatial reference of the .asc file.

I don't think you have to import your .asc files into a geodatabase except you need to do special analysis that is not possible in ArcGIS with asc file.

"when I do this to the original file and then import it will not create the resulting raster into a polygon,"

What do you mean by a polygon?

  • do you need a polygon that shows the extent of the raster?

  • answer: check Link

  • do you need polygons of the same pixel value (e.g. elevations) created from the raster?

  • answer: use "Raster to Polygon (Data management)" tool with you *.asc files.

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