Question: I'm looking for satellite imagery/elevation data/etc for a particular area. Where can I obtain this data and how much will it cost?
There are many sources of data available and the costs will widely vary. You may be able to use the File->Download Online Topo Maps/Imagery menu command to pull down the data that you need for free. If not, see the Supported Formats for a list of all of the formats supported by Global Mapper and links to sites where that data can be obtained. Some handy links are included below for reference.http://www.gisdatadepot.com/
Question: I recently installed Global Mapper v11 or later and my custom shaders, datums, and/or types from previous versions are not available.
You have to copy all of your custom*.txt files from the installation folder of your previous version to the application data folder for Global Mapper v11 for them to be found. You can find the location of that folder on the Help->About dialog in GM 11. The custom*.txt files are usually in your previous version install folder (like 'C:\Program Files\GlobalMapper10'), but on Vista and some other newer versions of Windows they are automatically moved somewhere else (a Virtual Data Store) by Windows. Just search your hard drive to find them and copy them to the GM 11 app data folder. The files will have names like custom_datums.txt, custom_shaders.txt, etc. and there may also be a CustomSymbols folder that you will want to copy.
Question: The software keeps asking me for a user name and registration number. Where do I get a registration number?
Global Mapper requires a registration number to perform some functions, such as exporting data. You can purchase a registration number from the Purchase page at http://www.globalmapper.com. 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.
Question: How do I fix an 'Error 1935' when trying to install Global Mapper v11 or later?
This error is caused when the previous installation of some other software package corrupts the installation of some shared system libraries from Microsoft. Although there is not a single "silver-bullet" fix for this, the following works for many people:
Run 'sfc.exe /scannow' from a command prompt run as Administrator (click the link below for more thorough instructions).http://www.bleepingcomputer.com/forums/topic43051.html
If that doesn't help, contact us at email@example.com and we can provide some additional things to try.
Question: I get an error about gdiplus.dll not being found when trying to run the software.
Global Mapper v9 and later requires that your system have GDI+ installed. Newer systems have this built-in, but some older systems (like some of those with Windows 2000, do not). You can download and install GDI+ on such a system from Microsoft by clicking the link below. After installing GDI+ Global Mapper should run fine.http://www.microsoft.com/downloads/details.aspx?FamilyID=6A63AB9C-DF12-4D41-933C-BE590FEAA05A&displaylang=en
Question: How do I change the projection that I'm viewing my 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.
Question: How do I change the projection that my data will be exported in?
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.
Question: How do I setup a local grid projection?
Typically for a local grid projection where you know the latitude and longitude of at least one point in the grid coordinate system, you simply setup a projection using either the Orthographic or Transverse Mercator projection system. When setting up the projection set the Central Meridian and Origin Latitude to the lat/lon of the known point and set the False Easting and False Northing parameters to the grid coordinates of your known point. Finally, make sure to select the proper units for your grid system.
Question: How can I change the color that is used to fill in areas of no data when exporting to an image format?
You can change the background color used both for display and for filling in areas with no data under the View menu.
Question: Can I create new features by tracing over loaded data and then exporting a new file?
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.
Question: How do I drape raster imagery (i.e. DRGs or aerial photos) over elevation data (i.e. DEMs)?
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?
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. Go to the Cropping tab of the dialog that appears and select the Automatically Crop DRG-style 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 go to the Cropping tab and manually specify a boundary to crop the collar to.
Question: How do I remove the collar from overlapping imagery files?
If the collar surrounding your imagery files is either black or white (or very close to one of those colors), you can use either the Darken or Lighten blend mode functionality in Global Mapper to remove the collars. To setup the blend modes, open the Control Center (found on the toolbar and under the Tools menu), highlight the imagery layers that you want to remove the collar from, and select the Options button. If the color is black, select the Lighten blend mode from the Blend Mode drop-down list. If the collar color is white, select the Darken blend mode. Then press OK. Finally, you'll also need to set the background color of the Global Mapper view to be either black or white to match the collar color so that the non-overlapping regions aren't affected. You can change the background color under the View menu.
Question: How come there is a thin border around exported DRGs (or image files) even after I have removed the collar in Global Mapper?
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.
One 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.
Another option is to use a format that supports transparency, like PNG or 24-bit RGB GeoTIFF, when doing your export, thus allowing Global Mapper to mark those border pixels as transparent on export. Note however that not all applications can handle image files with built-in transparency.
Question: How can I crop imagery to an irregular shape (i.e. an area) when exporting?
Using Global Mapper v6.06 and later, all that you need to do to crop to an area on export is first either load the file containing the area feature or draw it using the Digitizer or Measure Tool. Then, select the area feature with either the Pick Tool or the Digitizer Tool, then select the appropriate File->Export Raster and Elevation Data menu command. The Export Bounds tab of the export options dialog that appears will have an option at the bottom to "Crop to Selected Area". Select this option and the export will be cropped to the selected area.
It is important to note that if you are exporting to an image format like JPG, GeoTIFF, or ECW, the resultant image will still be rectangular. The areas outside the selected crop area will be filled in with the currently selected background color. You can change the background color under the View menu.
Question: How do I associate point features with files or web links?
Using Global Mapper v6.08 and later, you can treat any attribute/value pair associated with any vector feature (like point features) as either a link to a file on your local computer or a link to a web site. So to add a link, just create an attribute/value pair for the feature by first selecting the Feature Info tool, then clicking on the point feature, then pressing the Edit Feature button to bring up the edit dialog. On the edit dialog, add an attribute with a value that is either the filename or full URL to the web site, then press OK to return to the Feature Info dialog. Then, simply right click on the attribute/value pair in the Feature Info dialog and select the appropriate option from the popup menu to either open the value as a file or as a web link. If you already have the attributes assigned, there is of course no need to add them.
Question: Is there an easy way to copy the current cursor coordinates to the clipboard?
Yes, use the Ctrl+L shortcut key to copy the current cursor coordinate string to the clipboard. Once in the clipboard, it can be pasted into any location that accepts text using the Paste command, usually associated with the Ctrl+V shortcut.
Question: How do I zoom or pan around when measuring something with the Distance Tool without canceling the measurement?
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. You can also click and hold the middle mouse button to drag the map around.
Question: How do I import and project imagery (i.e. TIFF, JPG, etc.) files that have no projection or associated world files?
With Global Mapper v5.0 and above, you can rectify (georeference) any imagery, regardless of whether it has a world file. If you try to load imagery files 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.
Question: How do I generate a list of elevations from a list of coordinates?
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 documented at http://www.globalmapper.com.
Question: How do I generate an elevation grid (i.e. DEM) from a file containing elevation contours or 3D points?
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!
Question: How do I create a true-color image from imagery (i.e. Landsat) in which each color channel (red, green, and blue) is stored in separate files (i.e. TIFF files)?
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.
Question: Are there any restrictions on how I may use new maps created with Global Mapper?
There are no limitations or copyright restrictions on new data files created by Global Mapper other than those imposed by the original provider of the data used to create the new files. You are free to use any derivative data products created with Global Mapper for any purpose, both commercial and non-commercial, without the need to reference Global Mapper or obtain permission from Global Mapper Software LLC. We would of course appreciate a citation, but it is not required.
Question: Why do distances calculated using projected coordinates in systems like Mercator not always match the actual ground distance as reported by the Measure Tool?
Your are being confused by the 2 different types of "meters" being used. The Measure Tool always calculates accurate distances along the surface of the ellipsoid and is not affected by any distortion caused by a projection system, like Mercator.
When you use a projection system, like UTM or Mercator, it projects coordinates from the 3D surface of the earth to a 2D plane in some linear units, like meters. However, because any projection from an ellipsoidal surface to a 2D plane must have some sort of inaccuracies, the linear values reported in that system cannot be 100% accurate. For a projection like UTM the difference from ground truth is quite small so long as you are within or near the UTM zone. The Mercator projection on the other hand is quite accurate in the Y-direction Mercator meters relative to ground truth regardless of location, but the reported Mercator meters in the X direction will be significantly stretched as you get far from the equator, so that the reported distance in meters by using the Mercator projection will be several times greater than what the actual ground truth distance is. You can get the approximate degree of error in the Mercator meters X value by calculating 1 / cos( latitude ). At a latitude of 70N this means that each Mercator "meter" really corresponds to about 0.34 meters on the ground.
Question: Are there any plans for Unix or Macintosh versions of Global Mapper?
At this time a version of Global Mapper that can natively run on a Unix or Macintosh system is not available. However, users report good performance of GlobalMapper with both Parallels and Bootcamp on Intel-based Macs. A minimum of 2 Gigabytes of RAM is recommended. Global Mapper will also run through VirtualPC on older Macintosh systems, as well as on Linux systems under WINE.
Question: Is there an academic/student discount available for Global Mapper?
We do offer a discount to academic instutions and those that are verifiably students who will not be using Global Mapper for commercial purposes. Contact us at firstname.lastname@example.org for information on how to obtain this discount.
Question: If I already have dlgv32 Pro installed, how do I install Global Mapper?
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.