Open Printable/Searchable Copy - Global Mapper

You can combine multiple line features into a single line feature by first selecting the line features to combine,
then selecting the Combine Selected Line Features right-click menu option. This option will connect any lines
that you have selected that join at an endpoint. Any lines that are succesfully joined into a new one will be
marked as deleted.
When you select the option you will be allowed to setup options for the combine operation, including whether
or not the attributes of the lines have to much to be combined, if the lines being joined have to fully close, and
whether or not to create multiple areas if the selected lines don't all form a single path.
Finding the Intersection of Multiple Area Features
You can find the intersection of two area features by selecting both features, then right clicking and selecting
the Find Intersection of Selected Area Features menu command. This operation will create a new area feature
from the intersection of the two selected area features. You will also be prompted to create new area features
from what is left outside of the intersection. If you choose this option then the original area features will be
marked as deleted once the operation completes successfully.
Cutting Areas From/Adding Islands to Area Features
You can cut one area feature shape out of another area shape, either adjusting the second areas outer boundary
or making the first area feature become an island, or hole, within the second area by first selecting the area(s)
that you want to cut from another area/make into an island, then right click and select the Cut Selected Area(s)
from Another Area (Add Islands) menu option. You will then need to left-click in the area feature that you
would like to cut the selected area(s) out of.
Splitting Areas into Two New Area Features
You can split an existing area feature into two new area features by selecting the two vertices across which
you would like to split the area, then right clicking and selecting the Split Selected Area at Selected Vertices
menu option. This will generate two new area features by splitting the selected area feature across the segment
between the two selected vertices. Note in some situations you will get invalid areas or no result at all, so be
careful to select vertices for which the connected segment does not cross outside of the area or intersect any
island areas.
Cropping Features to Selected Area Features
You can crop any loaded features to one or more selected area features by first selecting the area feature(s) to
crop to, then right-clicking and selecting the Crop Loaded Features to Selected Area(s) option. This will
display a dialog allowing you to choose which types of features to crop, whether or not to mark the original
features as deleted, and what layer to put the cropped results in. Note that any features that are completly
enclosed in the cropped area and thus not cropped will just stay in their original layer.
Cropping Line Features to Area Features
Global Mapper User's Manual
You can crop or split selected line features to a selected area feature by right-clicking and selecting the option
to Crop/Split Selected Lines to Selected Areas. This will delete any portion of the line feature that lies outside
of the selected areas unless you select the Split option, in which case separate lines will be created for the
parts inside and outside the selected area feature(s). Note that the original line will remain available as a
deleted feature, so you can recover the original line if needed.
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