When a Image terrain is selected the SELECTION - TOOLS menu will be available. The SELECTION - TOOLS menu contains tools that allow you to change the ordering of your Image terrains, clip the Image terrains, or set other transparency or NoData values.



Mosaic Tools group


Icon
NameDescription
Move UpMoves the currently selected Image terrain up in the order of displayed Image terrains. All Image terrains displaying will be shown in a set order, from top to bottom on any areas of overlap. 
Move DownMoves the currently selected Image terrain down in the order of displayed Image terrains. All Image terrains displaying will be shown in order, from top to bottom on any areas of overlap.
ClipClip will cut an Image terrain down to the size of the selected Boundary item. Both the Boundary item and the Image terrain need to be selected to activate the Clip tool. Once used, any Image terrain data outside of the Boundary will be removed. 


Transparency group


Icon
NameDescription
-
TransparencySets a transparency level for the selected terrain. Any other Image terrain beneath the Image terrain will become visible. 
-
NoDataAllows you to set NoData values for your Image terrain including the color of NoData values and the tolerance.
-
ColorAllows you to set the Color of your NoData values. Most photogrammetry software sets the no NoData color to black. When imported into Virtual Surveyor that color is assigned as the NoData value, and any ares on the image will be considered NoData. For cases where the NoData value color was set to another color such as White, the color can be set. 
-
ToleranceAs the NoData value in Virtual Surveyor is based on color, the tolerance allows you to to increase the color range around your selected color that will be included as a NoData value.