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IDW Interpolation

NEDUniversity

i am working on IDW Interpolation , i want to know when IDW create , is there any grid file created or not, how can i see that or how can i get the data of that grid file

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DanPatterson_Retired

IDW creates a floating point grid, you can inspect it with the info tool and get some information that way or get the min and max etc from the grid's statistics. you will have to be clearer as to what you need further before other suggestions will be meaningful

NEDUniversity

thank u Dan for ur reply, i want longitude , latitude and z value which i have given at the time of IDW interpolation, can u tell me how can i make grid file , is it in .grd format, how can i make .grd format or where can i find it. thanx in advance

MarcoBoeringa

thank u Dan for ur reply, i want longitude , latitude and z value which i have given at the time of IDW interpolation, can u tell me how can i make grid file , is it in .grd format, how can i make .grd format or where can i find it. thanx in advance

Your interpolation results may be meaningless or at least harmed if you don't use an appropriate projected coordinate system during interpolation. Please see the excellent explanation by William Huber in this GIS StackExchange thread:

IDW spatial interpolation: appropriate projection?
http://gis.stackexchange.com/questions/58105/idw-spatial-interpolation-appropriate-projection

NEDUniversity

thank u boeringa, i understand the use of projected coordinate system, my only concern is how to create grid file after IDW interpolation and from where i can find that grid file

DanPatterson_Retired

IDW produces a grid and it is in the folder where you saved it.

NEDUniversity

Thanx dan , after IDW generates grid, my saved folder contains only .adf format files , i think grid format is .grd.

curtvprice

Thanx dan , after IDW generates grid, my saved folder contains only .adf format files , i think grid format is .grd.

The Esri grid format is composed of that grid folder (with .adf files in it) along with a few files in a parallel "info" folder. If you want to save in a different format, just specify an output with a file extension, i.e. .img

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