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Questions
Asked About GIS Global Mapper
3D GPS Mapping Software
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Question:
Can you explain the different types of data
and what I can do with them?
Answer:
See the Digital Grove site for a wonderful
description of the various kinds of GIS data
and what can be done with them. This site
includes sample uses of Global Mapper with
other software packages to achieve various
goals.
Digital
Grove
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Question:
The software keeps asking me for a user name
and registration number. Where do I get a
registration number?
Answer:
Global
Mapper requires a registration number to
perform some functions, such as exporting
data. You can purchase a registration number
from the Eagle
Globe Software Purchase
Page.
You do not need a registration number for
just viewing data, although you are limited
to viewing 4 data files simultaneously
without a registration key.
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Question:
How do I change the projection that I'm
viewing my data in?
Answer:
The current
view projection can be modified on the
Projection tab of the Configuration dialog.
You can access the Configuration dialog
either from the toolbar or under the Tools
menu.
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Question:
How do I change the projection that my data
will be exported in?
Answer:
All data
exports use the current view projection to
export data in. The current view projection
can be modified on the Projection tab of the
Configuration dialog. You can access the
Configuration dialog either from the toolbar
or under the Tools menu.
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Question:
Can I create new features by tracing over
loaded data and then exporting a new file?
Answer:
Yes, with
Global Mapper v5.0 and above, you can use
the Digitizer tool to draw new features on
top of loaded data. You can also edit
existing features with this tool. New and
edited features can be exported to new
vector files in any of the supported
formats, such as ESRI Shapefiles and DXF.
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Question:
How do I drape raster imagery (i.e. DRGs or
aerial photos) over elevation data (i.e.
DEMs)?
Answer:
To drape
raster imagery over gridded elevation data,
first load the elevation data, then the
raster data. Open the Control Center (found
on the toolbar and under the Tools menu),
highlight the raster image(s) you want to
drape, and select the Options button. Select
the Texture Map option and press OK. The
raster image(s) should now be draped over
the elevation data and shaded. Note that you
will have to have hill shading enabled in
order to see any difference (this is the
rightmost button on the toolbar).
Question:
How do I remove the collar from DRGs?
Answer:
To remove
the collar from USGS DRGs, open the Control
Center (found on the toolbar and under the
Tools menu), highlight the DRG(s) that you
want to remove the collar from, and select
the Options button. Select the Auto-Clip
Collar option and press OK. The collar
should now be removed from the selected
DRG(s).
If for some
reason the collar was not correctly removed,
you may need to specify the collar bounds
manually. To do this, press the Options
button again and select the Customize button
next to the Auto-Clip Collar option. This
will display a dialog allowing you to
manually specify the lat/lon bounds of the
image collar.
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Question:
How come there is a thin border around
exported DRGs even after I have removed
the collar in Global Mapper?
Answer:
The problem
of an extra border around exported DRGs that
have had the collar removed is caused by the
fact that DRG Quads are NOT rectangular in
the UTM projection after their collar has
been removed. Rather, they are aligned on
lat/lon grid boundaries, which makes them a
little bit skewed when viewed in a UTM
projection. Because the base TIFF and JPG
formats only support rectangular images,
something must be used to fill in the areas
around the quad such that the data fills a
rectangle. This extra fill causes the border
to appear.
The best
workaround for this problem is to reproject
the images to Geographic before exporting
them to a new file. This way the quads will
be rectangular and you won't have the extra
border around the data. You can change the
projection for viewing and exporting the
data by using the Projection tab on the
Tools->Configuration dialog. See the
earlier FAQ question for more details.
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Question:
How do I zoom or pan around when measuring
something with the Distance Tool without
canceling the measurement?
Answer:
You will
need to use the keyboard to zoom and pan
around while using the Distance Tool.
Switching tools will cause the measurement
to be canceled. The arrow keys allow you to
pan around and the Page Up/Page Down keys
allow you to zoom in and out.
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Question:
How do I import and project TIFF files
that have no projection or associated world
files?
Answer:
With Global
Mapper v5.0 and above, you can rectify (georeference)
any TIFF imagery, regardless of whether it
has a world file. If you try to load a TIFF
with no positioning information, you will be
prompted to rectify the image. You can also
use the File->Rectify (Georeference)
Imagery menu command to force the image to
be rectified.
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Question:
How do I generate a list of elevations
from a list of coordinates?
Answer: First load
the elevation data that you wish to get the
elevations from. Then use the
File->Import Generic ASCII Text File(s)
menu command to load a text file with a list
of coordinates. Finally, use the
File->Export Vector Data->Export
Simple ASCII Text File menu command and make
sure that the "Export Elevations for
Each Vertex" option is checked. This
should generate a new file with the
coordinates and the elevation for each point
in your original coordinate list. You can
also do this using the scripting language
documentation.
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Question:
How do I generate an elevation grid (i.e.
DEM) from a file containing elevation
contours or 3D points?
Answer: Using Global Mapper v5.08
and above, there is an easy way to do
this. First, load the file(s) containing
the contours and/or 3D points of interest
into Global Mapper using either the
File->Open Data File or File->Open
Generic ASCII Text File menu command,
depending on which is appropriate for the
type of data that you are loading. Then,
open the Overlay Control Center (under the
Tools menu or press Alt+C) and select the
layer(s) from which you want to generate
the elevation grid. Finally, right click
and select the Create Elevation Grid from
3D Vector Data option on the menu that
pops up and away you go!
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Question:
How do I create a true-color image from
LandSat imagery in which each color channel
(red, green, and blue) is stored in separate
TIFF files?
Answer: Using Global Mapper v5.08
and above, you can do this using the blend
mode functionality accessible from the
Overlay Control Center. First, load the
three TIFF files containing the separate
color channels. Then, open the Overlay
Control Center (under the Tools menu or
press Alt+C) and select the layer
containing the red colors. Press the
Options button and change the Blend Mode
selection to Keep Red, then press OK.
Repeat this for the blue and green layers
(selecting the Keep Blue and Keep Green
blend modes respectively). After doing
that you should have a color image in the
main view area, but it may still be hard
to see. To improve that, select all three
of the layers and press Options, then
enable the Auto-Adjust Contrast setting
and press OK. In many cases this will
generate a very visually appearing image,
that can then be saved to a single
full-color image using the GeoTIFF, BIL/BIP/BSQ
or JPG export options.
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Question:
Are there any plans for Unix or Macintosh
versions of Global Mapper?
Answer:
At this
time a version of Global Mapper than can
natively run on a Unix or Macintosh system
is not available. However, it is likely that
Global Mapper can run on VirtualPC on
Macintosh systems.
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Question:
Is there a student discount available for
Global Mapper?
Answer:
At this
time, there is no special student or
academic pricing available for Global
Mapper.
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Question:
If I already have dlgv32 Pro installed,
how do I install Global Mapper?
Answer: dlgv32 Pro
is a version of Global Mapper distributed by
the USGS. For all intents and purposes the
software packages are identical. If you wish
to replace dlgv32 Pro with Global Mapper but
maintain your settings, you need to follow
the following steps. First download and
install the latest version of Global Mapper.
Then run Global Mapper and exit it. This
will insure that your dlgv32 Pro settings
are copied to Global Mapper. Finally,
uninstall dlgv32 Pro from the Add/Remove
Programs option on the Control Panel.
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