The following types are used in functions related to surface analysis operations as parameters and return values. These types use fixed, numeric constants, which are defined here.
- globalmapper.GM_CombineOp_t8
Available operations when combining terrain layers
- Values:
- GM_CombineOp_Add = 0
Addition
- GM_CombineOp_SubtractSigned = 1
Subtraction (Difference) - Signed
- GM_CombineOp_SubtractUnsigned = 2
Subtraction (Difference) - Unsigned
- GM_CombineOp_Average = 3
Average Elevation
- GM_CombineOp_Minimum = 4
Minimum Elevation
- GM_CombineOp_Maximum = 5
Maximum Elevation
- GM_CombineOp_Multiply = 6
Multiply the values from the layers together
- GM_CombineOp_Divide = 7
Divide the First Layer Value by the Second
- GM_CombineOp_FilterKeepFirstIfSecond = 8
Filter - Keep First Layer Value only if Second Layer Value Valid
- GM_CombineOp_KeepFirstIfGTSecond = 9
Filter - Keep First Layer Value only if Greater Than Second Layer Value
- GM_CombineOp_KeepFirstIfLTSecond = 10
Filter - Keep First Layer Value only if Less Than Second Layer Value
- GM_CombineOp_KeepFirstIfSecondGTVal = 11
Filter - Keep First Layer Value only if Second Layer Value > Some Value
- GM_CombineOp_KeepFirstIfSecondLTVal = 12
Filter - Keep First Layer Value only if Second Layer Value > Some Value
- GM_CombineOp_FilterKeepFirstIfNotSecond = 13
Filter - Keep First Layer Value only if Second Layer Value Invalid
- GM_CombineOp_CountValid = 14
Count Valid Samples at Each Location
GM_CombineOp_NumTypes = 15
- globalmapper.GM_CombineOpFlags_t32
Flags used in the setup structure needed for a grid layer combine operation
- Values:
- GM_CombineOp_FillGaps = 0x00000001
Fill small gaps in terrain layers
- GM_CombineOp_HideProgress = 0x00000002
Hide progress for the operation
- GM_CombineOp_FindOverlap = 0x00000004
When counting layers, only count where all layers overlap (1 for valid from all, 0 otherwise)
- globalmapper.GM_DensityGridFlags_t32
Flags for density grid generation
- Values:
- GM_DensityFlags_DisableProgress = 0x00000001
Don’t display a progress dialog
- globalmapper.GM_DensityKernelType_t8
Different type of calculation kernels to use for density generation
- Values:
- GM_KernelType_Gaussian = 0
Gaussian
- GM_KernelType_Circle = 1
Circle
- GM_KernelType_Epanechnikov = 2
Anechnikov
GM_NumKernelTypes = 3
- globalmapper.GM_EqualValueAreaFlags_t32
Flags for the equal-value area operation
- Values:
- GM_EqualValueArea_ForceRGB = 0x00000001
Use RGB attribute for color attributes even if in palette
- GM_EqualValueArea_Coverage = 0x00000002
Just create a coverage layer, so we only care about valid or not
- GM_EqualValueArea_FixInvalid = 0x00000004
Automatically chop up any resulting areas that are invalid
- GM_EqualValueArea_BluntCorners = 0x00000008
Force the blunting of right angles to avoid invalid areas
- GM_EqualValueArea_NoSlope = 0x00000010
Don’t do equal value of slope even if slope shader is used
- GM_EqualValueArea_UseElevRange = 0x00000020
The mElevRangeLow/mElevRangeHigh values in GM_EqualValueAreaSetup_t are valid
- GM_EqualValueArea_UseSlopeDir = 0x00000040
Use slope direction values
- GM_EqualValueArea_BaseElevRangeZero = 0x00000080
make the area ranges based on elevations or slopes start at zero rather than having the bin at zero go +/- mElevDist to either side. For example, with mElevDist=500, you would get ranges of [0,1000),[1000,2000),… rather than [-500,500),[500,1500),…
- GM_EqualValueArea_HideProgress = 0x00000100
don’t display the progress bar during the process
- globalmapper.GM_GridAlg_t8
Gridding algorithm - Specify what gridding algorithm to use when gridding 3D vector data and point clouds
- Values:
- GM_GridAlg_TIN = 0
Triangulate and grid, same as normal 3D gridding
- GM_GridAlg_BinMinimum = 1
(DTM) Bin the points, use min value (i.e. elevation) in each bin, use a bin size some multiplier of average spacing
- GM_GridAlg_BinAverage = 2
Bin the points, use avg value (i.e. elevation) in each bin, use a bin size some multiplier of average spacing
- GM_GridAlg_BinMaximum = 3
(DSM) Bin the points, use max value (i.e. elevation) in each bin, use a bin size some multiplier of average spacing
- GM_GridAlg_BinMedian = 4
Bin the points. Use median value (i.e. elevation) in each bin.
- GM_GridAlg_BinVariance = 5
Bin the points. use variance of value (i.e. elevation) in each bin.
- GM_GridAlg_BinFromMaxElev = 6
Bin Lidar points, use attribute value from point with maximum elevation
- GM_GridAlg_BinFromMinElev = 7
Bin Lidar points, use attribute value from point with minimum elevation
GM_GridAlg_NumTypes = 8
- GM_GridAlg_None = 0xFF
Create a point cloud (don’t grid)
GM_GridAlg_Default = GM_GridAlg_TIN
- GM_GridAlg_DefaultLidar = GM_GridAlg_BinMinimum
Default algorithm for only Lidar points
- globalmapper.GM_GridGapFillAlg_t8
Gridding gap fill algorithm - specify what gridding algorithm to use when filling gaps
- Values:
- GM_GapFillAlg_None = 0
No Gap fill at all
- GM_GapFillAlg_TinSample = 1
Sample TIN surface triangles (piecewise affine) [only available with GM_GridAlg_TIN]
- GM_GapFillAlg_IDW = 2
Inverse weighted distance algorithm
- GM_GapFillAlg_Kriging = 3
Kriging
- GM_GapFillAlg_NearestNeighbor = 4
Use elevation of nearest valid sample
- GM_GapFillAlg_NaturalNeighbor = 5
The neighbor weights are calculated by finding how much of each of the surrounding areas is “stolen” when inserting (x,y) into the Voronoi tessellation
GM_GapFillAlg_NumTypes = 6
GM_GapFillAlg_Default = GM_GapFillAlg_IDW
- globalmapper.GM_GridGenFlags_t32
This type represents the different flags available for elevation grid generation
- Values:
- GM_GridGen_NoConstraints = 0x00000001
Don’t treat area and line boundaries as constraints (i.e. break lines)
- GM_GridGen_FlattenAreas = 0x00000002
Flatten 3D areas
- GM_GridGen_FillToBounds = 0x00000004
Fill the grid to the full bounding rectangle of the input data and not just to the convex hull
- GM_GridGen_IgnoreZeroElevs = 0x00000008
Don’t use features with an elevation value of 0
- GM_GridGen_HeightsRelative = 0x00000010
Vector elevations are relative to underlying terrain data (if loaded)
- GM_GridGen_CropToAreasIfAllAreas = 0x00000020
If all features are areas, mark everything outside areas as invalid
- GM_GridGen_IncludeStreams = 0x00000040
If stream lines are provided assign them elevations from intersecting lines
- GM_GridGen_SelAreasOnly = 0x00000080
Only consider selected areas
- GM_GridGen_AreaVertexRelativeOnly = 0x00000100
Only the area vertex height is relative to ground, not inside the area
- GM_GridGen_RelativeRequireValid = 0x00000200
If GM_GridGen_HeightsRelative is set, don’t grid points if there is no terrain at the location
- GM_GridGen_SaveGroundHeight = 0x00000400
If using Lidar field GM_LidarGrid_Height, grid the DSM (digital surface model) by working backwards from calculated heights above ground
- GM_GridGen_CreateLidarImage = 0x00000800
If gridding a Lidar field than can potentially be stored as an image or grid (i.e. GM_LidarGrid_Intensity), create an image rather than a grid
- GM_GridGen_ApplyLidarBreaklines = 0x00040000
Apply 3D line and 3D area features as breaklines when gridding Lidar data
- GM_GridGen_IgnoreTypeFilters = 0x00080000
Ignore any set type filters and grid all 3D features in the provided layer(s)
- GM_GridGen_TinAreasOnly = 0x00100000
Only grid 3D area features with TIN geometry (ignore all other features)
- GM_GridGen_HideProgress = 0x00200000
Don’t show progress during this operation
- globalmapper.GM_GridValType_t8
(DEPRECATED) List of supported grid layouts for GM_CreateCustomElevGridLayer
- Values:
- GM_GridValType_SInt16 = 0
Each sample is a signed 16-bit integer
- GM_GridValType_SInt32 = 1
Each sample is a signed 32-bit integer
- GM_GridValType_Float = 2
Each sample is an IEEE 32-bit floating point number
GM_GridValType_NumTypes = 3
- globalmapper.GM_PathProfileLOSFlags_t32
Flags to control the behavior of path profile/line of sight analysis
- Values:
- GM_PathProfile_LOSValid = 0x00000001
Perform line-of-sight analysis
- GM_PathProfile_LOSIgnoreEndpoints = 0x00000002
Ignore endpoints when performing line-of-sight analysis (i.e. end points can’t block line of sight)
GM_PathProfile_LOSFromHeightAbsolute = 0x00000004
- GM_PathProfile_LOSToHeightAbsolute = 0x00000008
Line-of-sight to height is absolute height above sea level rathern than height above ground
- GM_PathProfile_IgnoreEarthCurvature = 0x00000010
Ignore earth curvature in any line-of-sight analysis
- globalmapper.GM_RoughnessGridFlags_t32
Flags for roughness grid generation
- Values:
- GM_RoughnessFlags_DisableProgress = 0x00000001
Don’t display a progress dialog
- GM_RoughnessFlags_DontFixInvalid = 0x00000002
Don’t automatically chop up invalid areas to make them valid
- globalmapper.GM_RoughnessTable_t
Types of roughness tables for converting color values representing land cover to roughness values
- Values:
- GM_Roughness_CorineSummer = 0
CORINE Land Cover - Summer
- GM_Roughness_CorineWinter = 1
CORINE Land Cover - Winter
- GM_Roughness_VCF = 2
Vegetation Continuous Fields (GLCF from MODIS)
- GM_Roughness_NLCD = 3
US NLCD (National Land Cover Database)
- GM_Roughness_GlobCoverESA2009 = 4
GlobCover ESA 2009 Land Cover Database
- GM_Roughness_GlobeLand30 = 5
GlobeLand30 Land Cover Database
- GM_Roughness_ESA_CCI = 6
ESA CCI (Climate Change Initiative) Land Cover Database
- GM_Roughness_GlobCoverESA2020 = 7
GlobCover ESA 2020 Land Cover Database
GM_Roughness_NumTypes = 8
- globalmapper.GM_WatershedFlags_32
Flags for watershed calculations
- Values:
- GM_Watershed_FillGaps = 0x00000001
Fill small gaps when getting elevation values?
- GM_Watershed_CreateAreas = 0x00000002
Should we generate areas coverage the drainage basin for each stream?
- GM_Watershed_KeepZeroAtZero = 0x00000004
Keep elevation of zero at zero during depression filling
- GM_Watershed_SmoothStreams = 0x00000008
Smooth generated streams?
- GM_Watershed_FindRidgeLines = 0x00000010
Find ridge lines rather than streams. This is basically a watershed operation with inverted terrain.
- GM_Watershed_AutoStyle = 0x00000020
Automatically style generated stream / ridge lines
- GM_Watershed_CalcStrahler = 0x00000040
Specifies whether the Strahler stream order should be calculated and added to stream lines as an attribute