Package: zmapio
To install:$pipinstallzmapioBasic usage of zmapioimportmatplotlib.pyplotaspltimportnumpyasnpfromzmapioimportZMAPGrid%matplotlibinlineReading a ZMAP file:z_file=ZMAPGrid('./examples/NSLCU.dat')Accessing the comments header:forcinz_file.comments:print(c)Landmark Zmap grid file name:   .DATANSLCU.dat
Created/converted by Oasis Montaj, Geosoft Inc.Plotting the grid data:z_file.plot()Counts for rows and columns:z_file.no_cols,z_file.no_rows(435, 208)Shape for z-values:z_file.z_values.shape(208, 435)Exporting to CSV file:z_file.to_csv('./output/output.csv')head./output/output.csv-630000.0,2621000.0,-16481.9570313
-630000.0,2618000.0,-16283.9033203
-630000.0,2615000.0,-16081.5751953
-630000.0,2612000.0,-15856.7861328
-630000.0,2609000.0,-15583.7167969
-630000.0,2606000.0,-15255.734375
-630000.0,2603000.0,-14869.3769531
-630000.0,2600000.0,-14426.1513672
-630000.0,2597000.0,-13915.8769531
-630000.0,2594000.0,-13340.4677734Exporting to WKT file:z_file.to_wkt('./output/output.wkt',precision=2)Exporting to GeoJSON file:z_file.to_geojson('./output/output.json')Exporting to Pandas Dataframe:df=z_file.to_dataframe()df.Z.describe()count    90480.000000
mean     -5244.434235
std       4692.845490
min     -16691.371094
25%     -10250.590088
50%      -4003.433105
75%      -1320.896881
max       2084.417969
Name: Z, dtype: float64Write a new ZMAP file as 3 nodes per line format:z_file.write('./output/test.zmap',nodes_per_line=3)head./output/test.zmap! Landmark Zmap grid file name:   .DATANSLCU.dat
! Created/converted by Oasis Montaj, Geosoft Inc.
@.DATANSLCU.dat, GRID, 3
20, 1e+30, , 7, 1
208, 435, -630000.0, 672000.0, 2000000.0, 2621000.0
0.0, 0.0, 0.0
@
      -16481.9570313      -16283.9033203      -16081.5751953
      -15856.7861328      -15583.7167969      -15255.7343750
      -14869.3769531      -14426.1513672      -13915.8769531Creating a ZMAP object from string:z_text="""
!
! File created by DMBTools2.GridFileFormats.ZmapPlusFile
!
@GRID FILE, GRID, 4
20, -9999.0000000, , 7, 1
6, 4, 0, 200, 0, 300
0.0, 0.0, 0.0
@
       -9999.0000000       -9999.0000000           3.0000000          32.0000000
          88.0000000          13.0000000
       -9999.0000000          20.0000000           8.0000000          42.0000000
          75.0000000           5.0000000
           5.0000000         100.0000000          35.0000000          50.0000000
          27.0000000           1.0000000
           2.0000000          36.0000000          10.0000000           6.0000000
           9.0000000       -9999.0000000
"""z_t=ZMAPGrid(z_text)z_t.plot()Adding colorbar and colormap using matplotlib:z_obj=ZMAPGrid('./examples/NStopo.dat')fig=plt.figure(figsize=(12,6))z_obj.plot(cmap='jet')plt.colorbar()Creating a new ZMAP object from 2D-Numpy array with shape (no_cols,
no_rows):z_val=z_obj.z_valuesprint('Z-values shape: ',z_val.shape)new_zgrid=ZMAPGrid(z_values=z_val,min_x=-630000.0000,max_x=672000.0000,min_y=2000000.0000,max_y=2621000.0000)Z-values shape:  (435, 208)new_zgrid.plot(cmap='gist_earth')Customize writing a ZMAP file:new_zgrid.comments=['this is','a test']new_zgrid.nodes_per_line=4new_zgrid.field_width=15new_zgrid.decimal_places=3new_zgrid.name='test'new_zgrid.write('./output/new_z.dat')head./output/new_z.dat!this is
!a test
@test, GRID, 4
15, 1e+30, , 3, 1
208, 435, -630000.0, 672000.0, 2000000.0, 2621000.0
0.0, 0.0, 0.0
@
        -67.214        -67.570        -67.147        -69.081
        -73.181        -74.308        -72.766        -72.034
        -70.514        -68.555        -66.195        -62.776Referenceshttps://lists.osgeo.org/pipermail/gdal-dev/2011-June/029173.htmlhttps://gist.github.com/wassname/526d5fde3f3cbeb67da8Saltus, R.W. and Bird, K.J., 2003. Digital depth horizon compilations of the Alaskan North Slope and adjacent arctic regions. U.S. Geological Survey data release:https://doi.org/10.3133/ofr03230