georef
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georef [2018/10/11 02:51] – [Coordinate Transformation] allchin09 | georef [2018/10/12 04:09] – [Coordinate Transformation] allchin09 | ||
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The Victorian land agency also appear to have a free tool perform transformations called [[https:// | The Victorian land agency also appear to have a free tool perform transformations called [[https:// | ||
+ | Killet Software has an [[http:// | ||
+ | A paper on the [[http:// | ||
+ | |||
+ | == An example - ANG to GDA94 == | ||
+ | |||
+ | The trial version of [[http:// | ||
+ | |||
+ | It's important to note the convention used (either Coordinate-Frame Rotation, or Position Vector) to define the three rotation parameters (signs are flipped between them). | ||
+ | |||
+ | The output in position vector format was: | ||
+ | |||
+ | ^Parameter^Value^Units^ | ||
+ | |dx|195.056526|m| | ||
+ | |dy|-112.959677|m| | ||
+ | |dz|-172.456394|m| | ||
+ | |rx|3.59354054|rad, | ||
+ | |ry|5.39693644|rad, | ||
+ | |rz|-1.34857381|rad, | ||
+ | |s|-3.2756552|ppm| | ||
+ | |||
+ | Combining these with the known values of the ellipsoid parameters of the ANS, a custom CRS can be defined in PROJ to allow transform between ANS and GDA94 coordinates. This can then be used in QGIS to ' | ||
+ | |||
+ | The following PROJ string was used to define the ANS CRS: | ||
+ | |||
+ | '' | ||
+ | |||
+ | This CRS is then available to be applied to any raster. | ||
==== Coordinate Conversion ==== | ==== Coordinate Conversion ==== | ||
georef.txt · Last modified: 2021/03/11 00:31 by allchin09