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Math behind first order polynomial transformation

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02-09-2011 12:50 PM
FernandoCacciola
New Contributor
Hello,

I'm working on a standalone project for geoprocessing GEOTIFF images. I am using GDAL for this.
A particular dataset contains a spatial reference that is not interpreted by GDAL, and I've been told that it has been created using ArcGIS.

I can see an .aux.xml file, and in there a first order polynomial transformation, having a source and target GCP, each with 8 double parameters.

Can anyone help me with a pointer on the math behind this polynomial so I can implement the required functionality myself? FWIW, my goal is to convert geodetic lat/lon coordinates into raster x,y coordinates.

TIA
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1 Reply
DanPatterson_Retired
MVP Emeritus
the online help files...
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html?TopicName=welcome

where the following link was found...
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009t000000mn000000.htm

re:  "my goal is to convert geodetic lat/lon coordinates into raster x,y coordinates"
why don't you project the data to an appropriate projection?  or am I missing something?
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