Coordinate Errors Don’t Announce Themselves.
Until They Do.

Global Mapper includes Blue Marble’s GeoCalc geodetic engine, which provides access to 12,000+ geodetic definitions covering projected, geographic, and vertical coordinate systems. That depth means GIS professionals can perform coordinate conversion accurately and consistently, whether they’re working with a single dataset or reconciling data pulled from multiple sources, jurisdictions, or time periods.

For more than 30 years, Blue Marble has developed geodetic technology trusted by surveying, engineering, energy, and government organizations worldwide. 

Blue Marble’s GeoCalc geodetic engine, integrated into Global Mapper, powers coordinate conversion and datum transformation workflows used by surveying, energy, and government organizations worldwide. With 12,000+ geodetic definitions, full support for time-dependent transformations, and support for the modernized NSRS and CSRS, Global Mapper delivers geodetic capabilities that go beyond what most general-purpose GIS platforms provide out of the box. Unlike using a standalone geographic calculator or coordinate conversion tool, these capabilities are built directly into Global Mapper, eliminating the need for a separate application or license. 

Global Mapper supports precise horizontal and vertical datum transformations, including time-dependent transformations such as Horizontal Time-Dependent Positioning (HTDP), time-specific transformations, 14-parameter transformations, and Canadian velocity grids. For workflows where the date of the coordinate epoch matters, those parameters are built into the transformation, not applied as a manual correction after the fact.

A datum transformation adjusts geospatial data between different geodetic reference systems so locations remain accurate when coordinate systems change. Unlike simple coordinate conversion, datum transformations account for differences in how the Earth’s shape and position are modeled, ensuring data collected from different sources aligns correctly.

Blue Marble’s Global Mapper supports precise horizontal, vertical, and time-dependent transformations, allowing organizations to maintain spatial accuracy across jurisdictions, projects, and evolving reference standards.

Global Mapper includes full support for the modernized National Spatial Reference System (NSRS) and Canadian Spatial Reference System (CSRS), ensuring data aligns with the latest national and regional reference frameworks without manual adjustments or compatibility workarounds. For GIS professionals working on projects with strict government or agency reference requirements, support for these modernized reference systems is built in and ready to apply.

Geodetics is the science of measuring and accurately defining positions on the Earth’s surface. It provides the mathematical foundation for coordinate systems, datums, and spatial reference frameworks used throughout GIS. Blue Marble’s GeoCalc geodetic engine provides the geodetic foundation for accurate coordinate conversion, datum transformations, and spatial validation across 12,000+ supported definitions.

A datum defines the mathematical model used to represent the Earth’s shape and establish geographic positions. On the other hand, a coordinate system builds on that datum by assigning coordinates that describe where features exist within that reference framework.

Both are essential to geospatial accuracy. Even datasets that appear to use the same coordinates can be significantly misaligned if they reference different datums. Validating both before data leaves the office helps prevent costly downstream errors.

Yes. Batch coordinate conversion allows GIS professionals to convert multiple files simultaneously without rebuilding data structures or reformatting outputs.  Attribute integrity stays intact through the process, and spatial relationships remain accurate across the entire dataset. What comes out is consistent and ready for the next stage of the workflow.

On-the-fly reprojection allows you to view and analyze data from different coordinate systems in the same workspace without stopping to convert each layer manually. Global Mapper automatically reconciles coordinate systems during visualization, allowing datasets to be viewed and analyzed together without permanently transforming the underlying data. It is most useful when you’re working with datasets from multiple sources that don’t share a common coordinate reference and you need to analyze them together without building a full conversion workflow first.

Yes. Coordinate validation happens in the office before data ever leaves the platform. Global Mapper lets GIS professionals verify coordinate systems, apply the correct transformation, and confirm spatial accuracy before packaging maps and data for field deployment. What arrives in the field is exactly what was prepared and validated at the desk.

Coordinate conversion, reprojection, and datum transformation each solve different geodetic challenges. Coordinate conversion changes how geographic positions are expressed between coordinate systems. Reprojection transforms data between different coordinate reference systems (CRSs). Datum transformation adjusts data between different geodetic datums to maintain positional accuracy when the underlying reference framework changes. 

Because geospatial data often comes from multiple sources, organizations frequently need to combine all three processes to ensure datasets align correctly before analysis, mapping, or field deployment. Powered by Blue Marble’s GeoCalc geodetic engine, Global Mapper supports 12,000+ geodetic definitions and performs accurate coordinate conversions, reprojections, and datum transformations within a single workflow.

Global Mapper supports the following file formats: