topic Connecting a raster and a table in ArcGIS Spatial Analyst Questions

Connecting a raster and a table

PhilipCaruso — Fri, 28 Nov 2014 06:27:02 GMT

I have a series of .tif images that are landsat images and for each of those images I have a table (.tab) of calculated NDVI values. the number of colums and rows in the table correspond to each pixel on the images. I want to convert these tables into a raster format so I can clip out a study area (a specific watershed) and run some statistical analysis on the values that are within my study area. Anyone have any suggestions on how to best go about this?

Thanks.

Re: Connecting a raster and a table

curtvprice — Sat, 29 Nov 2014 00:47:58 GMT

It seems like the easiest way to do this would be export your table to text file (space-separated) - one approach would be export to dbf, open in Excel, save as text - then add the header information required to put the data into ASCII To Raster format. You may need to determine and add some georeferencing information (lower left corner, cell size) to get it to line up with your .tif file when converted to raster.

ArcGIS Help (10.2, 10.2.1, and 10.2.2): Ascii To Raster

You also may want to consider moving this post to: Managing Data‌

Re: Connecting a raster and a table

XanderBakker — Sat, 29 Nov 2014 17:49:49 GMT

Not sure, but wouldn't it be easier to calculate the NDVI based on the imagery (in case you have access to the Spatial Analyst extension)?

NDVI = ((IR - R)/(IR + R))

IR = pixel values from the infrared band
R = pixel values from the red band