I am eventually migrating my software from GM19 to GM26 (it was time...).

Looking at the what_to_distribute_64_bit.txt document to determine what files I need to pack with my own pieces of software, I am starting thinking that this information is not up to date, since, for instance, I can't find any CGAL*.dll.

I am refering to the file provided in the doc directory of the SDK. Am i wrong ? Where to find accurate information on delivery requirements ?

Thanks,

Yann

I'm trying to export a huge raster (eg 25000x19000 or even bigger) or a lot of smaller ones (let's say 2048x2048) using the GM_ExportRasterEx c++ function. I really need to create the overviews to speed up the display of these exported orthophotographies.

Using SDK 26, I tried

status = GM_ExportRasterEx(newName, GM_Export_GeoTIFF, &rasterLayerInfo._layer, 1, &bounds, width, height, GM_ExportFlags_UseLZW, "ADD_OVERVIEW_LAYERS=YES");

using the "ADD_OVERVIEW_LAYERS=YES" option found somewhere in this forum, but it does not seem to be working.

I also tried

GM_SetMiscOption(GM_MiscOpt_GeoTIFFExportOverview, 1);

but that's not any better.

I guess I missed something ?

Thanks,

Yann

using GM_LoadLayerList I'm trying to load some layers from a .gmw file.

Whenever a file is missing, I have a pop up dialog asking whether I want to select a new location or skip the file. If I skip the file, a new popup asks whether to cancel the entire operation or not. If I continue, the script continues to load, but in the end, the GM_LoadLayerList function returns an error 63 (Error_Script) and an empty layer list.

I was expecting the function to return the layers that were properly loaded. Is there any other method to call to achieve that goal ? Or from the API, the slightest error prevents the correct layers to be loaded ?

Thanks

I'm trying to create an elevation grid from a point cloud using Python in Global Mapper. I want to limit the grid to a specific polygon area feature named "BDY". In the UI, there’s an option to "Crop to selected area feature(s)", which works as expected. However, I can’t figure out how to replicate this behavior in the Python script.

The script generator always produces the same code and doesn’t include anything about using a specific area feature to crop the grid.

Could someone please advise how to specify the layer and feature (by name or attribute) to use as a boundary for creating the elevation grid?

Here’s a sample of the generated script:

elevation_grid_param = gm.GM_GridGenSetup_t()

elevation_grid_param.mBandType = gm.GM_VAL_F32

elevation_grid_param.mDesc = "Cleaned.las (DTM Elevation Values)"

elevation_grid_param.mElevUnits = gm.GM_PRJ_UNIT_METERS

elevation_grid_param.mFlags = 262242 # see GM_GridGenFlags_t32 for flag list

elevation_grid_param.mGridAlg = gm.GM_GridAlg_BinMinimum

elevation_grid_param.mGridBinMult = 5

elevation_grid_param.mLidarBreaklineBinMult = True

elevation_grid_param.mLidarField = gm.GM_LidarGrid_Elevation

elevation_grid_param.mTaperValue = 0

elevation_grid_param.mTightnessMult = 0

elevation_grid_param.mXRes = 0.5

elevation_grid_param.mYRes = 0.5

layer_arr = []

layer_arr.append( gm.FindLoadedLayer("Cleaned.las") )

err, elev_grid_layer = gm.GenerateElevationGrid2(layer_arr, elevation_grid_param)

Reading docs (https://www.bluemarblegeo.com/knowledgebase/global-mapper-python-23/Enumerations/EnumExport.html): "use GM_ExportOptsSHP_t for aFormatOptions parameter to GM_ExportVector", GM_ExportOptsSHP_t class itself has 3 attributes (mAddLabelAttr, mAddLayerAttr and mAddStyleAttr that should include GM_TYPE, label, etc to the exported dbf) but the aFormatOptions parameter only accepts integer values ​​and the GM_ExportOptsSHP_t class seems to have no method to return an int.

Here is a code example:

exported_features = []

# Load all layers from file
err, array_ptr, array_size = gm.LoadLayerList(workspace_path, gm.GM_LoadFlags_UseDefaultLoadOpts)
if err:
    quit()
all_layers = gm.GM_LayerHandle_array_frompointer(array_ptr)

# Vector layers only
vector_layers = []
for layer in gm.carray_to_list(all_layers, array_size):
    if gm.GetLayerInfo(layer).mHasVectorData:
        vector_layers.append(layer)

for layer in vector_layers:
    name = gm.GetLayerInfo(layer).mDescription
    name_wo_ext = name[:name.index(".")] if "." in name else name
    destination = os.path.join(target_dir, name_wo_ext) + ".shp"
    # Export all layer content
    err = gm.ExportVector(
        aFilename=destination,
        aFormat=gm.GM_Export_Shapefile,
        aLayer=layer,
        aWorldBounds=None,
        aFlags=gm.GM_VectorExportFlags_GenPRJFile + gm.GM_VectorExportFlags_ExportAll + gm.GM_VectorExportFlags_ExportAttrs,
        aFormatOptions=0x0
    )
    if not err:
        exported_features.append(name_wo_ext)
        
    else:
        print(err)
print(exported_features)

How can i use GM_ExportOptsSHP_t in this example? Is there any workaround to include the <Feature Type> inside attributes?!

Thanks 😉

All other sample projects can run well but the Delphi folder only has a formless unit file. Is this correct or something is wrong on my end.

Also, when I run with the forms that I've added, an error that the GlobalMapperInterface.dll cannot be found, I built and compiled, and even manually copying thr dll to the project file, but the error persists. Please help.

Thank you

I have this code to load a jpg image (1920X1080) with ground control points and then save it to geotif file.

The first problem is that the saved image is flipped in the X axis.

The second problem is the metadata is incorrect.

I code in Delphi. The @ sign is the address of the data.

Here is the variables:

LLA_Projection:GM_Projection_t;

aGroundControlPoints:Array of GM_GroundControlPoint_t;

aLayerHandle:GM_LayerHandle_t32;

Here is the code :

LLA_Projection.mProjSys:=GM_PRJ_GEO;

LLA_Projection.mDatum :=GM_DATUM_WGS_84;

LLA_Projection.mUnit  :=GM_PRJ_UNIT_ARC_DEGREES;

LLA_Projection.mNumAttrs:=1;

LLA_Projection.mAttrList[0].mAttr:=CENTRAL_LONGITUDE;

LLA_Projection.mAttrList[0].mValue:=0;

GM_SetProjection(@LLA_Projection);

SetLength(aGroundControlPoints,2);

aGroundControlPoints[0].mPixelX:=0;

aGroundControlPoints[0].mPixelY:=0;

aGroundControlPoints[0].mGroundX:=77.115;

aGroundControlPoints[0].mGroundY:=28.725;

aGroundControlPoints[1].mPixelX:=0;

aGroundControlPoints[1].mPixelY:=0;

aGroundControlPoints[1].mGroundX:=77.125;

aGroundControlPoints[1].mGroundY:=28.715;

aLoadFlags:=GM_LoadFlags_HideProgress;

GM_LoadRectifiedLayer(StringToPAnsiChar('C:\Temp\test.jpg'),

@aLayerHandle,aLoadFlags,

@aGroundControlPoints,2,

@LLA_Projection);

theErr:=GM_ExportRaster(StringToPAnsiChar('C:\Temp\test.tif'),

            GM_Export_GeoTIFF,

            aLayerHandle,

            Nil,

            1920,

            1080,

            GM_ExportFlags_HideProgress);

GM_CloseLayer(aLayerHandle);

Above is the Original JPG

Below is the file I got.

Can you help please ?

Thanks Allot

Raz

I'm using the SDK to develop a C# WPF app, and I want to load a Globl Mapper workspace on which I have some layers with scale ranges on the display options,

When I load the workspace, all the layers are correctly loaded but displayed at any zoom level, it seems like it ignores scale ranges,

They are correctly written in the .gmw file, with in the IMPORT line an argument ZOOM_DISPLAY="SCALE_RANGE,50000000,100000000"

Does anyone know how to use it properly ? Or is there an issue in the SDK by itself ?

I'm using the code in the WPFSample solution in the SDK.

Best regards,

François

My goal is to add or create a customize button inside the global mapper that interact with the data loaded. It's just like an extension like the COAST and BRIDGE extension.

The program that I creating is only run outside the Global Mapper. This not my goal.

My Question are:

Where to start?

What do I need to download?

I try to search on how to develop an extension and try to find any guide or tutorial but I cant find one. Hopefully I can find an answer here.

I am trying to match histograms between two or more raster layers using the SDK functions. I would like to know if there is a method or function that helps me get the color histogram of a Raster layer or other color information that can help me with histogram matching. I see that for v18.1 one of the new features is "function to calculate color statistics within an area" but I have not found such function in the API documentation. I am working with C++, SDK 20.0

Thanks

var File = "D:\\Projects\\Drone\\quarry_dsm.tif";
            Console.WriteLine("Load file when caculating volume " + File);
            // Load the layer
            IntPtr theLayerList;
            UInt32 theNumLayers = 0;
            LastGMError = GlobalMapperDLL.GM_LoadLayerList(File, out theLayerList, out theNumLayers, 0);
            // If the layer loaded successfully then get the layer info.
            // User the bounding rectangle in the layer info as the curent
            // view rectangle.
            if (LastGMError == GlobalMapperDLL.GM_Error_t32.GM_Error_None)
            {
                // Add each layer
                for (Int32 i = 0; i < theNumLayers; i++)
                {
                    // Extract the layer handle from the list
                    IntPtr theLayerHandlePtr = (IntPtr)((UInt32)theLayerList + i * IntPtr.Size);
                    IntPtr theLayerHandle;
                    theLayerHandle = (IntPtr)Marshal.PtrToStructure(theLayerHandlePtr, typeof(IntPtr));
                    // Add the layer
                    AddLayer(theLayerHandle, true);
                    Console.WriteLine("Count layer " + LayerHandles.Count);
                    GM_Point_t A;
                    A.mX = 205260.911678;
                    A.mY = 1770722.30487;
                    GM_Point_t B;
                    B.mX = 205269.92369;
                    B.mY = 1770609.09146;
                    GM_Point_t C;
                    C.mX = 205385.39010;
                    C.mY = 1770659.78403;

                    GM_Point_t[] points = new GM_Point_t[3] { A, B, C};
                    IntPtr intPtr;
                    unsafe
                    {
                        // Must pin object on heap so that it doesn't move while using interior pointers.  
                        fixed (GM_Point_t* pArray = points)
                        {
                            // p is pinned as well as object, so create another pointer to show incrementing it.  
                            intPtr = new IntPtr((void*)pArray);
                        }
                    }
                    GlobalMapperDLL.GM_AreaVolumeParams_t gM_AreaVolumeParams_T;
                    gM_AreaVolumeParams_T.mSize = 3;
                    gM_AreaVolumeParams_T.mPoints = intPtr;
                    gM_AreaVolumeParams_T.mNumPoints = 4;
                    gM_AreaVolumeParams_T.mCutHeight = 10;
                    gM_AreaVolumeParams_T.mXSpacing = 0.00927500000000054;
                    gM_AreaVolumeParams_T.mYSpacing = 0.00927500000000029;

                    double cutVolume;
                    double fillVolume;
                    GlobalMapperDLL.GM_CalcVolumeOfArea(theLayerHandle, ref gM_AreaVolumeParams_T, out cutVolume, out fillVolume);
                    System.Console.WriteLine("Calculate Fill volume " + fillVolume.ToString());
                    System.Console.WriteLine("Calculate CUT volume " + cutVolume.ToString());
                }
             }
            else if (GlobalMapperDLL.GM_Error_t32.GM_Error_NotRegistered == LastGMError)
            {
                MessageBox.Show("Please register to load more files.");
                return;
            }

Can you plz help me check ?

Thanks