Rectify images

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Rectify images

Rectify images

Rectify images command creates rectified images from raw images in the image list. There is no mosaic step which means that for each raw image a new georeferenced image is produced.

The process requires a rectification surface which is usually provided by a ground model. 3D surface objects and breaklines stored in the design file can be included in the rectification process.

To rectify images:

1. Select Rectify images command from the Utility pulldown menu.

This opens the Rectify images dialog:

rectify_images

2. Define settings and click OK.

This starts the image rectification process. An information window shows the number of rectified images out of the number of all images. The rectified images are stored in the Rectified images directory that is defined in the mission definition.

SETTING

EFFECT

Rectify

Raw images to use: All images, Selected or images captured by a given <camera>.

Output naming

Naming method of the output files: Raw file name or rec<image number>.

Pixel size

Pixel size of the output images.

Format

Raster file format to produce: ECW compressed, GeoTIFF, or JPEG2000. The following settings depend on the selected format. If a GeoTIFF file exceeds the size of 4 GB, a BigTIFF file is written.

Create EWW files

If on, external georeference files are created for ECW compressed files. The files have the extension .EWW.

Ratio

Compression ratio for ECW compressed or JPEG2000 files.

Datum

Datum information that is written in the header of ECW compressed and JPEG2000 files. Commonly used datum names can be selected by using the Select button.

Projection

Projection information that is written in the header of ECW compressed and JPEG2000 files. Commonly used projection names can be selected by using the Select button.

Color depth

Defines how color values are stored in GeoTIFF files: 8 bit, 3*8 bit, 4*8 bit, 3*16 bit, or 4*16 bit.

Create TFW file

If on, external georeference files are created for GeoTIFF files. The files have the extension .TFW.

Coord system

Coordinate system information that is written in the header of GeoTIFF files. Commonly used coordinate system names and numbers can be selected by using the >> button.

Search points

Margin around each image for searching ground model points.

Laser points

Memory handling of ground model points:

Keep in memory - keep all ground model points in memory.

Save temporarily - save laser points temporarily, load only needed points for each image and reload all points in the end of the process.

Abandon - free laser point memory, load only needed points for each image but do not reload points in the end.

Use surface objects

If on, 3D shapes from the given design file Levels are used in addition to the ground model. This may result, for example, in roofs of high buildings being at the correct xy location in the rectified images.

Use breaklines

If on, linear elements from the given design file Levels are added as breaklines to the ground model.

Use color points

If on, color points from the given File are included in the rectification process.

Sample pixel color

If on, the pixel color for a rectified image is computed by sampling a circular area from the raw image.

Fill object gaps

If on, small gaps Upto the given size next to surface objects are filled.