rlove@uottawa.ca

PNG Raster to XYZ Table

Discussion created by rlove@uottawa.ca on Aug 14, 2013
Latest reply on Aug 15, 2013 by erice-esristaff
Hello All,

First things first, I am fairly new to ArcGIS so if I've missed something obvious, that would be why. Basically what I have is a figure in PNG format which I have imported into ArcGIS as a raster and I want to get out values for each point on the figure as an xyz table(lon, lat, value). I have gotten it geo-referenced alright I believe as the boarders on my imput data line up with that which I've set up for reference(A Hammer_Aitoff projection). The things I've been having trouble with is getting the data into the table with lon lat for x and y, I always seem to wind up with some strange co-ordinate system in the 80K+ region of values. I'm using the spatial analyst>Extraction>Sample tool and setting the output co-ordinate system to that of my display since I assume that is the co-ordinate system I would want since my cursor shows lon and lat values for any given point. Also I would like to sample the colors on my figure and assign those to specific values to save me the grief of coding up a python script to match each RGB value to a numerical one, I assume this is fairly trivial and I've just not found the function yet.

Cheers and thanks

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