topic Math behind first order polynomial transformation in Geoprocessing Questions https://community.esri.com/t5/geoprocessing-questions/math-behind-first-order-polynomial-transformation/m-p/40824#M1485 <HTML><HEAD></HEAD><BODY><SPAN>Hello,</SPAN><BR /><BR /><SPAN>I'm working on a standalone project for geoprocessing GEOTIFF images. I am using GDAL for this.</SPAN><BR /><SPAN>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.</SPAN><BR /><BR /><SPAN>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.</SPAN><BR /><BR /><SPAN>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.</SPAN><BR /><BR /><SPAN>TIA</SPAN></BODY></HTML> Wed, 09 Feb 2011 20:50:12 GMT FernandoCacciola 2011-02-09T20:50:12Z Math behind first order polynomial transformation https://community.esri.com/t5/geoprocessing-questions/math-behind-first-order-polynomial-transformation/m-p/40824#M1485 <HTML><HEAD></HEAD><BODY><SPAN>Hello,</SPAN><BR /><BR /><SPAN>I'm working on a standalone project for geoprocessing GEOTIFF images. I am using GDAL for this.</SPAN><BR /><SPAN>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.</SPAN><BR /><BR /><SPAN>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.</SPAN><BR /><BR /><SPAN>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.</SPAN><BR /><BR /><SPAN>TIA</SPAN></BODY></HTML> Wed, 09 Feb 2011 20:50:12 GMT https://community.esri.com/t5/geoprocessing-questions/math-behind-first-order-polynomial-transformation/m-p/40824#M1485 FernandoCacciola 2011-02-09T20:50:12Z Re: Math behind first order polynomial transformation https://community.esri.com/t5/geoprocessing-questions/math-behind-first-order-polynomial-transformation/m-p/40825#M1486 <HTML><HEAD></HEAD><BODY><SPAN>the online help files...</SPAN><BR /><A href="http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html?TopicName=welcome">http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html?TopicName=welcome</A><BR /><BR /><SPAN>where the following link was found...</SPAN><BR /><A href="http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009t000000mn000000.htm">http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009t000000mn000000.htm</A><BR /><BR /><SPAN>re:&nbsp; "my goal is to convert geodetic lat/lon coordinates into raster x,y coordinates"</SPAN><BR /><SPAN>why don't you project the data to an appropriate projection?&nbsp; or am I missing something?</SPAN></BODY></HTML> Thu, 10 Feb 2011 19:46:50 GMT https://community.esri.com/t5/geoprocessing-questions/math-behind-first-order-polynomial-transformation/m-p/40825#M1486 DanPatterson_Retired 2011-02-10T19:46:50Z