Rectify mosaic

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Rectify mosaic

Rectify mosaic

Rectify mosaic command starts the production of an orthophoto mosaic.

Various rectification settings control the quality and the speed of the rectification process. TerraPhoto can produce lower quality ortho photos very fast. In contrast, if you select the highest quality options, the application uses a more complex process which takes a longer time. The different settings are illustrated in Chapter Orthophoto Production.

The process requires the selection of rectangular shape elements prior to starting the command. The rectangular shapes specify the tiles of the resulting orthophoto mosaic. They are preferably created with Place tile array command or Place Tile Array tool in TerraPhoto, but any MicroStation tool the produces rectangular shapes can be used as well.

To create an ortho photo mosaic:

1. Use MicroStation Selection tool in order to select tile shapes and (optional) text elements for naming the tiles.

2. Select Rectify mosaic command from the Rectify pulldown menu.

This opens the Rectify selected tiles dialog:

rectify_selected_tiles

3. Define settings and click OK.

This starts the rectification process. The software produces one orthophoto for each selected tile.

SETTING

EFFECT

Use images

Raw images to use: All images or Selected.

Attach

Defines how to display the produced ortho images:

Do not attach - no display.

As TerraPhoto references - attach and display as reference files in TerraPhoto.

Pixel size

Pixel size of the orthophotos. This should be the same or a multiple of the pixel size used when creating the tiles.

Tile naming

Tile naming method. In addition to user-defined tile naming schemes, you can select from:

Automatic numbering - application assigns increasing numbers to tiles in selection order.

Selected names - a selected text element inside each tile is used.

Selected numbers - a selected numerical text element inside each tile is used.

User-defined tile naming schemes are defined in Tile naming schemes of TerraPhoto Settings.

Prefix

Text that is included in the tile names before the numbering or the selected text elements.

First tile

Number of the first selected tile. This is only active if Tile naming is set to Automatic numbering.

Format

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

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.

Create EWW file

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

Color depth

Defines how color values are stored in GeoTIFF files: 8 bit, 3*8 bit, 3*16 bit, 4*8 bit, 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 EPSG numbers can be selected by using the >> button.

_select_classes

Opens the Select coordinate system dialog which contains a list of common coordinate system names and their EPSG numbers. The dialog lets you also specify the Unit for writing GeoTIFF files.

Background R G B

RGB color values for locations outside the image area.

Search points

Margin around each tile 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 tile and reload all points at the end of the process.

Abandon - free laser point memory, load only needed points for each tile but do not reload points at the end of the process.

Cache

Image cache increase in megabytes for the rectification task. This is only active if Laser points is not set to Keep in memory.

Sample pixel color

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

Use surface objects

If on, true orthophotos are produced using shapes from given Levels in addition to the rectification surface.

Fill object gaps

If on, small gaps Up to the given amount of pixels next to surface objects in true orthophotos are filled. This is only active if Use surface objects is switched on.

Edge buffer

Distance from the edge of a 3D object within which object pixels are not rectified on the ground. The prevents, for example, roof pixels to be rectified on the ground next to buildings. This is only active if Use surface objects is switched on.

Use color points

If on, color points from the selected File are used to balance brightness and color differences between images.

Use breaklines

If on, breaklines from the given Levels are add to the ground model and thus, included in the rectification process.

Use boundaries

If on, polygons from the given Levels are used to limit the area that is filled with raw image information. Pixels outside the polygons are filled with the given Background RGB color.

Use selection shapes

If on, selection shapes stored in the active design file are used in the rectification process.

Draw text

If on, a text is burned into each ortho photo. This can be used, for example, to at a watermark to all orthophotos. The text as well as size, color, transparency, and position of the text can be set by using the Define button.