Preparation of images

In order that the oblique aerial images can be linked to the footrpints in WebOffice 10.9 SP1 and thus displayed, the following points are relevant:

oNaming of the image files according to the correct scheme

oStorage in correct directory structure

oFile size of the images

These individual points are explained in the following sections.

 

(1) Naming of the image files according to the correct scheme

In order to reference the images with the respective footprint, a certain naming of the image files is necessary. This is based on the calculation of the attribute Bildinfo from chapter Preparation of Footprints. The naming must follow the following scheme:

 

<Image_Number> + “_“ + <Flight_Direction> + “-“ + <Camera_Orientation> + “.jpg“

 

a possible example would be:

 

"05634_O-Backward.jpg

 

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The values from the file naming must match exactly with the respective values of the attribute Bildinfo of the Footprints, so that an assignment in WebOffice is possible. For more information about the attributes, please refer to the chapter Preparation of the Footprints.

 

(2) Storage in correct directory structure

The aerial images renamed in step (1) must then be stored in the correct directory structure in a virtual directory. This directory structure is again structured according to the respective camera orientation. So if you have Backward, Forward, Left and Right as attributes for the camera orientation, these directories have to be created as well and the respective images have to be stored there.

 

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The naming of the directories must exactly match the respective values of the attribute Bildinfo of the footprints as well as the image file naming to allow an assignment in WebOffice. More information about the attributes can be found in the chapter Preparation of the Footprints.

 

(3) File size of the images

For a performant display of the oblique aerial images in WebOffice 10.9 SP1 the file size of the images must be taken into account. If the images are very detailed, they may have to be compressed. This can be done semi-automatically, e.g. with the software IrfanView:

 

VertiGIS recommends a compression rate of 85%.

In IrfanView the function Batch Conversion/Rename can be selected under the File tab.

Batch Conversion IrfanView

Batch Conversion IrfanView

 

There you can navigate to the directory with the already renamed images to add them as Input files using the Add all button. At Output format you select JPG-JPG/JPEG Format and at Options you set the quality using the slider (here 85%). The higher the value, the better the quality, but the slower the performance in the web application when loading the images.

 

The parameter Output folder for result files defines the directory where the compressed images should be saved.

 

Configuration Batch Conversion - IrfanView

Configuration Batch Conversion - IrfanView

 

In the Avanced section VertiGIS recommends those settings, which are shown in the following screenshot:

 

Configuration Advanced Batch Conversion IrfanView

Configuration Advanced Batch Conversion IrfanView

 

Then the function Start Batch must be executed.