Website Review
What is Global Mapper Forum?
Global Mapper Forum is the official user community for Global Mapper, the GIS software from Blue Marble Geographics. It is a discussion board rather than a tutorial site or product page: members post questions, report bugs, share workflows, and suggest features, and other users or staff reply in threads. The forum describes a community of around 40,000 GIS professionals.
What you'll find there
- Technical Support — troubleshooting questions, often marked "Answered" once solved, such as importing Surpac
.strand.dtmfiles or exporting a GeoTIFF with overviews. - Elevation Data, Vector Data, Imagery, and SDK sections — narrower boards for terrain grids, LiDAR and UAV data, path profiles, coordinate transformations, and scripting.
- Suggestion Box and Bug Report — feedback threads where users request changes or flag defects.
- How I use Global Mapper — practical, experience-based posts about real workflows.
- Announcements — beta releases and news, for example the Global Mapper v28.0 beta announcement.
A typical thread is short: a question, a few replies, and occasionally a confirmation that the answer worked. Some threads, like one on opening Surpac files, accumulate thousands of views over time.
When it's useful, and when it isn't
| Your situation | Forum fit |
|---|---|
| A specific error, import/export problem, or script issue | Strong — search first, then post with your version and data details |
| Deciding whether a workflow is possible before buying | Moderate — you can read threads without an account in many cases |
| Learning GIS from scratch | Weak — it assumes familiarity with GIS concepts |
| Official documentation or licensing answers | Weak — use Blue Marble's own resources instead |
Practical next step
Search the board for your exact error message plus your Global Mapper version before posting; many questions, such as thinning X,Y,Z data or placing an image onto a map, already have answered threads. If you post, include the version, file format, and steps to reproduce — the replies tend to be concrete and quick when the question is specific. For broader GIS discussion beyond this one product, communities such as Geographic Information Systems Stack Exchange cover cross-software questions.
How do I get help with a specific Global Mapper problem on the forum?
Post in the most specific board that matches your problem, include the exact steps and file details, and attach a sample or screenshot where possible. The forum is the official user community for Global Mapper, run by Blue Marble Geographics, and its discussion list is organized into categories such as Technical Support, Elevation Data, Vector Data, Bug Report, SDK, Suggestion Box, and Features Discussion. Choosing the right one puts your question in front of people who already work with that part of the software.
A practical posting routine
- Search existing threads first. Many common questions already have an "Answered" thread with a marked solution.
- Pick the narrowest matching category — for example, a raster export problem belongs in SDK or Technical Support rather than Other Discussion.
- Write a descriptive title. Compare "How do I thin X,Y,Z data?" with a vague "Help please"; the specific one is easier for others to find and answer.
- State your Global Mapper version, the data format you are importing or exporting, and the exact menu path you used.
- Show what you expected versus what happened, and paste any error text.
- Include a small sample file or a screenshot of the dialog box. Questions about greyed-out or ticked options are much easier to resolve when the moderator or another user can see the dialog.
What to expect
Threads on the board show replies arriving within days, and some are marked "Answered" once resolved. Staff accounts and experienced users both participate, so you may get an official answer or a workaround from another professional. If your issue turns out to be a genuine defect, a moderator may ask you to move it to Bug Report.
When the forum is the wrong tool
For licensing, account, or urgent production outages, contact Blue Marble support directly. The forum is best for "how do I do this in Global Mapper" questions, workflow comparisons, and format-specific problems. For general GIS concepts rather than Global Mapper behavior, a broader community such as GIS Stack Exchange may reach a wider audience.
A useful next step: before posting, open the category that matches your data type and read two or three recent threads. Their titles and detail level show you the house style, which makes your own question more likely to get a fast, specific answer.
Is Global Mapper free or paid, and what do users say about its pricing model?
Global Mapper itself is paid software; the forum is the free part. Global Mapper Forum is Blue Marble Geographics' official user community for Global Mapper, so its threads are where licensing changes get discussed first-hand rather than in marketing copy. The site's own description frames it as a place for GIS professionals to learn the software, not as a download or trial page, and the visible discussion list contains no pricing or checkout links — so treat it as a place to research cost, not to buy or activate a license.
What the forum shows about pricing sentiment
The clearest signal in the page evidence is a thread titled "New pricing model thoughts (or how I USED to use Global Mapper)," posted by a user going by kfroese. The title alone carries the sentiment: the phrase "how I USED to use" suggests a long-time user whose workflow changed after a pricing shift. The thread sits in the "How I use Global Mapper" section and had drawn only a couple of comments at the time shown, so it reads as an early reaction rather than a settled consensus.
Beyond that, the discussion list is dominated by technical topics — elevation grids, LiDAR classification, path profiles, Surpac file imports, geotiff pyramids and script loading. That mix is itself informative: this is a working-professional community, and pricing threads appear as occasional interruptions to technical support rather than the main subject.
Practical decision criteria
- If you need a one-off map or conversion: check whether a free trial or a lower-cost viewer tier fits before assuming you must buy the full product. The forum won't tell you current prices reliably.
- If you rely on scripting or the SDK: the forum's SDK and scripting threads suggest these are supported areas, but licensing terms for automation and redistribution are exactly the kind of thing that changes — confirm directly with the vendor.
- If you're budgeting long-term: the "USED to use" framing is a reminder that perpetual-license assumptions can shift. Ask the vendor about upgrade and maintenance terms, not just the entry price.
Next step
Read the pricing thread and then post your own question with your specific use case — seat count, commercial vs. academic, and whether you need the SDK. Forum members tend to answer concrete scenarios far better than general "is it worth it" queries. For authoritative current pricing, go to Blue Marble Geographics directly; the forum is best used to learn how real users weigh the cost against alternatives.
How do I import Surpac .str and .dtm files into Global Mapper?
Global Mapper can open Surpac .str and .dtm files directly, and the forum thread on this topic is marked as answered—meaning a working method exists rather than just a workaround. The practical route is to use File → Open Data File(s) and set the file-type filter to Surpac (or "All Files") so the .str/.dtm extension is recognised. If the files don't appear, try adding the folder via File → Open Data File(s) with the Surpac format explicitly selected, or drag the files onto the map window.
Surpac .str files typically hold string or point data (drillhole traces, survey strings), while .dtm files are triangulated surface models. In Global Mapper these should load as vector line/point layers and as an elevation/TIN surface respectively. Check the Control Center after import: the .dtm should appear as an elevation layer you can use for contours, slope, or volume work, and the .str as vector features you can style, query, or export.
If the import fails or geometry looks wrong, the likely causes are:
- Coordinate system mismatch—Surpac files often carry no projection, so set the source projection manually under the layer's Options.
- Units (metres vs feet) affecting Z values.
- Version differences between the Surpac format and what the installed Global Mapper build supports.
The Global Mapper Forum is the right place to post the exact error text or a sample file if the standard import doesn't work; the thread in question shows other users and Blue Marble staff responding to this same question. As a next step, open one .dtm first, confirm it renders as a surface, then add the .str files and verify their alignment against it before running any analysis.
How can I fix the 'flatten 3D area Features' option being greyed out when creating an elevation grid?
The greyed-out “flatten 3D area Features” checkbox is usually a state problem, not a bug: the option only becomes active when Global Mapper has both an elevation source and qualifying 3D area features loaded in the same workspace, and when the grid creation dialog is being run in a mode that can consume them. If either half is missing, the checkbox stays disabled and ticked-looking.
What to check first
- Confirm your elevation data is actually loaded and selected as the grid source, not just visible in the layer list.
- Confirm at least one area feature exists and carries Z values — a 2D polygon drawn on the map will not qualify.
- Check that the area feature type is enabled in the grid dialog’s feature/vector options; some workflows filter out area features by default.
- Verify the features are in a layer that is editable or at least not locked.
A concrete scenario You have a LiDAR-derived DEM and a set of building footprint polygons. If the footprints were imported from a shapefile without elevation attributes, they are flat 2D areas and the flatten option has nothing to act on. Add Z values (via attribute-based elevation or by draping them onto the terrain) and reopen the dialog.
The forum thread in the discussion list shows this exact question raised by user Blooper under the “How I use Global Mapper” section, with a reply from the same user — meaning it was self-resolved rather than answered by staff, so the fix likely depended on their specific data state.
Next step Reopen the elevation grid dialog after loading both layers fresh, and if the option is still grey, test with a single simple 3D polygon to isolate whether the problem is the elevation source or the feature layer. If it persists, post the layer list and feature types to Global Mapper Forum, where Blue Marble staff and other users can check the specific configuration.
How do I export a GeoTIFF raster with overviews or pyramids from Global Mapper?
Exporting a GeoTIFF with overviews (often called pyramids) from Global Mapper is done through the raster export dialog, not a separate "build pyramids" command. The forum thread on this exact topic shows it is a routine, answered question rather than an exotic workflow, so expect it to be a checkbox or option inside the export settings rather than a multi-step process.
Where to look
- Open File → Export → Export Raster/Image Format, then choose GeoTIFF as the format.
- In the GeoTIFF export options, look for an option labeled something like Generate Overviews, Create Pyramids, or Build Overviews. Enabling it writes reduced-resolution copies into the same file.
- If you also need compression, GeoTIFF export typically offers tiling and compression choices alongside the overview setting.
Why overviews matter
Overviews let a viewer display a zoomed-out version of a large raster without reading every pixel. Without them, opening a multi-gigabyte GeoTIFF in QGIS, ArcGIS or a web map viewer can be slow, because the software either renders full resolution or builds its own temporary pyramid. Writing them at export time makes the file self-contained and portable.
Practical cautions
- Overviews increase file size, though usually far less than the base image.
- If your downstream software expects an external
.ovrfile instead of internal overviews, check that setting before exporting. - For rasters you will only use once in Global Mapper itself, building overviews may be unnecessary overhead.
For the specific dialog wording in your version, the official user forum is the right place to confirm, since menu labels shift between releases. The relevant thread and related export questions appear under the SDK and technical support sections at Global Mapper Forum. If your version's dialog differs from what you expect, search the forum for "overviews" or "pyramids" before posting — the question has been asked and answered, as the thread listing shows.
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