topic Re: How the �??transformation method�?� is different from �??resample type�?�? in Data Management Questions

How the ???transformation method??? is different from ???resample type????

JamalNUMAN — Wed, 23 May 2012 17:12:23 GMT

How the ???transformation method??? is different from ???resample type????

I???m wondering based on which equations the ArcGIS perform sthe transformation. What is meant by ???adjust??? that exists as a transformation method (screenshot below)?

[ATTACH=CONFIG]14573[/ATTACH], [ATTACH=CONFIG]14574[/ATTACH]

What is the effect of the ???transformation method??? and ???resample type??? on the produced georeferenced raster?

Thank you for the help,
Best
Jamal

Re: How the �??transformation method�?� is different from �??resample type�?�?

PatrickTaurman — Wed, 23 May 2012 19:38:58 GMT

Hi Jamal,

You may want to look at the Fundamentals for georeferencing a raster dataset Web Help.

Patrick

Re: How the �??transformation method�?� is different from �??resample type�?�?

Anonymous User — Wed, 23 May 2012 21:49:47 GMT

Original User: ebowman

Hi Jamal,

Patrick has a great link to the help for this topic.

The transformation is for warping the image within coordinate space and creating a world file. The default method is affine that has scale, skew, rotate. The x and y axis are independent of each other. The 2nd and 3rd order polynomials are more complex calculations for dealing with skew. These methods are used to make the image line up in coordinate space so that world file can be created.

The resample is used for exporting out an georeferenced image to be rectified. The help lists this useful for other programs that cannot read an external world file. I typically don't rectify it but stop after doing the transformation. If you use the what's this button on the resample, it will explain what each of those methods are.

Hope this helps.
Eric