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The documentation for GDALDataset::GetGeoTransform says some things that are rather confusing.

Fetches the coefficients for transforming between pixel/line (P,L) raster space, and projection coordinates (Xp,Yp) space.

Xp = padfTransform[0] + PpadfTransform[1] + LpadfTransform[2];

Yp = padfTransform[3] + PpadfTransform[4] + LpadfTransform[5];

In a north up image, padfTransform1 is the pixel width, and padfTransform[5] is the pixel height.

The upper left corner of the upper left pixel is at position (padfTransform[0],padfTransform[3]).

The default transform is (0,1,0,0,0,1) and should be returned even when a CE_Failure error is returned, such as for formats that don't support transformation to projection coordinates.

If this is a matrix, it makes sense that Pixel_X is at 1,1 and Pixel_Y is at 2,2.

Here is my question:

So should the equation for Yp be:

Yp = padfTransform[3] + L*padfTransform[4] + P*padfTransform[5];

in which the positions of L and P are swapped?

Or if I am confused about something, can someone help me get unconfused?

gdal documentation

share

asked 3 mins ago

philologonphilologon

1135

add a comment | 

0

The documentation for GDALDataset::GetGeoTransform says some things that are rather confusing.

Fetches the coefficients for transforming between pixel/line (P,L) raster space, and projection coordinates (Xp,Yp) space.

Xp = padfTransform[0] + PpadfTransform[1] + LpadfTransform[2];

Yp = padfTransform[3] + PpadfTransform[4] + LpadfTransform[5];

In a north up image, padfTransform1 is the pixel width, and padfTransform[5] is the pixel height.

The upper left corner of the upper left pixel is at position (padfTransform[0],padfTransform[3]).

The default transform is (0,1,0,0,0,1) and should be returned even when a CE_Failure error is returned, such as for formats that don't support transformation to projection coordinates.

If this is a matrix, it makes sense that Pixel_X is at 1,1 and Pixel_Y is at 2,2.

Here is my question:

So should the equation for Yp be:

Yp = padfTransform[3] + L*padfTransform[4] + P*padfTransform[5];

in which the positions of L and P are swapped?

Or if I am confused about something, can someone help me get unconfused?

gdal documentation

share

asked 3 mins ago

philologonphilologon

1135

add a comment | 

The documentation for GDALDataset::GetGeoTransform says some things that are rather confusing.

Fetches the coefficients for transforming between pixel/line (P,L) raster space, and projection coordinates (Xp,Yp) space.

Xp = padfTransform[0] + PpadfTransform[1] + LpadfTransform[2];

Yp = padfTransform[3] + PpadfTransform[4] + LpadfTransform[5];

In a north up image, padfTransform1 is the pixel width, and padfTransform[5] is the pixel height.

The upper left corner of the upper left pixel is at position (padfTransform[0],padfTransform[3]).

The default transform is (0,1,0,0,0,1) and should be returned even when a CE_Failure error is returned, such as for formats that don't support transformation to projection coordinates.

If this is a matrix, it makes sense that Pixel_X is at 1,1 and Pixel_Y is at 2,2.

Here is my question:

So should the equation for Yp be:

Yp = padfTransform[3] + L*padfTransform[4] + P*padfTransform[5];

in which the positions of L and P are swapped?

Or if I am confused about something, can someone help me get unconfused?

gdal documentation

share

asked 3 mins ago

philologonphilologon

1135

Yp = padfTransform[3] + L*padfTransform[4] + P*padfTransform[5];

share

asked 3 mins ago

philologonphilologon

1135

share

asked 3 mins ago

philologonphilologon

1135

asked 3 mins ago

philologonphilologon

1135

asked 3 mins ago

philologonphilologon

1135