Official version history and changelog information for Surfer (2021). 

Surfer 21.1.158 (May 5, 2021)

New Features and Improvements:

• 3D View: display 3D polylines, 3D polygons and 3D polymeshes in 3D
• Change To: convert regular points, polylines and polygons to 3D polylines and 3D polygons (and vice versa)
• Import: import 3D polylines, 3D polygons and 3D polymeshes as 3D geometry
• Properties: Coordinates: display and edit Z coordinates for 3D geometry
• Grids: calculate area and volume between contours
• 3D PDF Export: reduce file size of exported file using the grid surface "quality reduction"
• Display 32-bit BGRA images with or without transparency (turn off the alpha channel)
• DXF Export: option to export LWPOLYLINE with no ZLEVEL (2D flat polylines)
• Automation: all grid exporting/saving commands need an export options string
• Automation: ClassedPostLayer: new Class properties (including colormap)
• Automation: GridAssignNoData: use polygon boundary
• Automation: GridProject
• Automation: LabelFormat: DMSFormat and DMS options
• Automation: PointSample
• Automation: SaveFile [Grid]: use parameter for SpatialReferences

Fixes:

• 3D View: VRML Export: surface artifacts exist and blanked/NoData areas not removed
• Axes: Automatic Scaling should not default to something that gives you an error
• Axis Grid Lines: minor grid lines don't show up before first major tick
• Base from Data: doesn't import coordinate system information for data (e.g. from GSR2, PRJ)
• Base layer: Coordinates: when you move a polygon into base layer, the tracker isn't visible
• Convert Layer: converting to 3D surface creates empty map
• Coordinates Page marker tracker incorrect after moving shape within a Base Map
• Coordinates Page vertices do not update when moving shapes within a Group within a Base Map
• Crash after closing when displaying drop-down from Properties control
• Crash after pasting contour layer into base layer
• Crash in notifications when NotificationStatuses.txt has been altered
• Crash reports: thousands of ZIPs in Temp were created when report cannot be sent (connection issue, etc.)
• Crash when drawing filled contours after undo Break Apart
• Crash when Grid Data - Variogram after minimizing window
• Crash when Undo
• Endless Internal Error setting map scaling to 'inf' (axis.cpp, line 133)
• Export KML/KMZ: object IDs for point objects are not exported
• GPX Import Filter wasn't reading the elevation data
• Internal Error after closing a window (gscatch.cpp)
• Internal Error after creating 3D view (memorymappedcache.cpp)
• Internal Error after grouping/ungrouping objects (Scenelist.cpp)
• Internal Error when adding a profile over Z values with high number of sig digs (usertransform.cpp)
• Internal Error when converting a 2-grid vector to a 3D wireframe or 3D surface (iogrid.cpp)
• Internal Error when expanding Map and then delete (polygonnode.cpp)
• Internal Error when gridding data with Kriging (polarvariosurface.cpp)
• Internal Error when importing file with '%' character in filename
• Internal Error when opening a Surfer 7 SRF file with filled contours that have bad header info (contourfill.cpp)
• Internal Error when reshaping a polygon (reshapetool.cpp)
• Internal Error when Undo Order Change or Undo Delete (scenelist.cpp)
• Internal Error when undoing group with color scale after breaking apart layer (scenelist.cpp)
• Internal Error when undoing group, ungroup and reshape (gscatch.cpp)
• Internal Error with Grid Data using Kriging (kriginggridder.cpp)
• Internal Error: Grid Data: when loading settings for pages that don't use the settings
• KMZ import: File is stretched/wrong limits after import
• Objects are not grouping when the Attribute Table is open
• Open Grids: item added for each time you click on an open grid

Surfer 20.2.218 (March 3, 2021)

Fixes:

• 3D View: performance improvements so it is faster
• Axes: error opening SRF file which opened without error in previous versions
• Crash in worksheet after getting Invalid row number error
• Crash when using map wizard
• Error: encountered an improper argument saving to default Temp folder
• Error: encountered an improper argument when editing grid from internal storage
• Grid Calculus: error when selecting an existing grid ("Input grid must be at least 3 rows x 3 cols")
• Internal Error in worksheet when using Text to Number
• Internal Error when loading MIF (trgraphics.cpp)
• Internal Error when open an S10 SRF file with inappropriate axis scaling settings in S16 (axis.cpp)
• Internal Error when pressing left arrow key (scenenodetreectl.cpp)
• Internal Error when saving a grid with 1-grid node dimension (iogrid.cpp)
• Notifications: message text is too small to read on high resolution monitors
• Notifications: users often see "error occurred when we tried to download the latest notifications"
• Save: improve the save process for SRF files to not rely on the Temp folder when resaving

Surfer 20.1.195 (January 5, 2021)

New Features and Improvements:

• New Map Type: Peaks and Depressions
• Base Map: use attribute as Object ID for polylines, polygons, points
• Grid Info: Polygon Boundary: report statistics for each polygon individually
• Grid Volume: Polygon Boundary: report volume for each polygon individually
• 3D View: 3D PDF Export: reduce file size
• 3D View: 3D PDF Export: speed up export
• 3D View: add color scale bar
• 3D View: Antialiasing (improve appearance of grid lines, axes, text, etc)
• 3D View: export to VRML
• 3D View: light 3D point symbols (spheres, cubes) based on Environment Light Position
• 3D View: Vector Contours: use same line properties (width, color) as original contour lines
• Automation: add Base from Data
• Automation: add new top level legend
• Automation: add Base layer symbology
• Automation: CoordinateSystem: New Local System (WKT parser should support LOCAL_CS)
• Automation: GridData: have Grid Z Limits option
• Automation: GridData: have Z Transform option
• Automation: GridData: save and load the grid settings files (*.srfgds)
• Automation: add new map scale bar options
• Automation: MapFrame: set ScalingRatio
• Automation: PostLegend: add new properties
• Automation: VectorLegend: add new properties

Fixes:

• 3D View: 3D surface map and 1-grid vector map with same source grid creates two surfaces
• 3D View: Disabled surface texture appears in 3D PDF export
• 3D View: Title angle does not rotate title text
• Contents: Undo deletion: layers from different maps are selected in Contents
• Crash after creating 3D view
• Crash when closing Surfer after printing
• Crash when importing multiple files
• Crash when opening an empty PDF file to Surfer
• Double click on BAS opens empty Scripter
• EMF export: Rotated text exports as polygons/polylines for certain degrees of rotation
• Internal Error (cacheejectionlru.cpp)
• Internal Error after clicking to 3D view and getting error can't transform coordinates (gscatch.cpp)
• Internal Error after creating 3D Surface map (graphics3.cpp)
• Internal Error after exporting the 3D View to 3D (stratosstatemanager.cpp)
• Internal Error in 3D view with Walk (statepresenter.cpp)
• Internal Error when cancelling 3D View flythrough (grid.cpp)
• Internal Error when closing Surfer (autodocuments.cpp)
• Internal Error when creating contour map (with fill) from Grid Calculus command
• Internal Error when loading an ASC grid (trlattice.cpp)
• Internal Error when set contour smoothing (contourlabeler.cpp)
• Internal Error with Undo (scenelist.cpp)