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# Copyright (C) 2003 by Intevation GmbH |
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# Authors: |
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# Jan-Oliver Wagner <[email protected]> |
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# |
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# This program is free software under the GPL (>=v2) |
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# Read the file COPYING coming with Thuban for details. |
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""" |
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Extend thuban with a gns2shp converter. |
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This module also works without Thuban on the command line |
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if the shapelib and dbflib python wrappers can be found via the |
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PYTHONPATH (e.g. via including directory 'Lib' of thuban directory). |
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The GUI should eventually be extended to allow pre-selection |
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of the points to import in order to reduce immense quantities |
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of some country files. |
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""" |
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__version__ = '$Revision$' |
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# $Source$ |
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# $Id$ |
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import os, sys |
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# only import GUI when not called as command line tool |
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if __name__ != '__main__': |
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from wxPython.wx import * |
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from Thuban.UI.command import registry, Command |
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from Thuban.UI.mainwindow import main_menu |
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from Thuban import _ |
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from Thuban.Model.layer import Layer |
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import shapelib |
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import dbflib |
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def gns2shp(src_fname, dest_fname): |
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"""Convert a file from gns textformat into a Shapefile. |
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The GNS text format is described on |
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http://www.nima.mil/gns/html/cntyfile/gis.html |
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src_fname -- Filename of the GNS standard textfile (including suffix '.txt) |
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dest_fname -- Filename where to write the Shapefile components (name |
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without suffix). After successful completion there |
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will be files "dest_fname".shp, "dest_fname".shx and |
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"dest_fname.dbf". |
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Return: Number of sucessfully converted entries |
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""" |
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gns_filename = src_fname |
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shp_filename = dest_fname + '.shp' |
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dbf_filename = dest_fname + '.dbf' |
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gns = open(gns_filename, 'r').readlines() |
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shp = shapelib.create(shp_filename, shapelib.SHPT_POINT) |
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dbf = dbflib.create(dbf_filename) |
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dbf.add_field('RC', dbflib.FTInteger, 1, 0) |
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dbf.add_field('UFI', dbflib.FTInteger, 10, 0) |
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dbf.add_field('UNI', dbflib.FTInteger, 10, 0) |
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dbf.add_field('UTM', dbflib.FTString, 4, 0) |
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dbf.add_field('JOG', dbflib.FTString, 7, 0) |
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dbf.add_field('FC', dbflib.FTString, 1, 0) |
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dbf.add_field('DSG', dbflib.FTString, 5, 0) |
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dbf.add_field('PC', dbflib.FTInteger, 10, 0) |
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dbf.add_field('CC1', dbflib.FTString, 2, 0) |
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dbf.add_field('ADM1', dbflib.FTString, 2, 0) |
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dbf.add_field('ADM2', dbflib.FTString, 2, 0) |
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dbf.add_field('DIM', dbflib.FTInteger, 10, 0) |
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dbf.add_field('CC2', dbflib.FTString, 2, 0) |
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dbf.add_field('NT', dbflib.FTString, 1, 0) |
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dbf.add_field('LC', dbflib.FTString, 2, 0) |
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dbf.add_field('SHORT_FORM', dbflib.FTString, 40, 0) |
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dbf.add_field('GENERIC', dbflib.FTString, 40, 0) |
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dbf.add_field('SORT_NAME', dbflib.FTString, 40, 0) |
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dbf.add_field('FULL_NAME', dbflib.FTString, 40, 0) |
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dbf.add_field('FULL_ND', dbflib.FTString, 40, 0) |
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dbf.add_field('MODIFY_DATE', dbflib.FTString, 11, 0) |
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del dbf |
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dbf = dbflib.open(dbf_filename, 'r+b') |
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gns.pop(0) # drop the header line |
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i = 0 |
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for line in gns: |
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if line[0] == '#': continue |
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RC, UFI, UNI, DD_LAT, DD_LONG, DMS_LAT, DMS_LONG, UTM, \ |
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JOG, FC, DSG, PC, CC1, ADM1, ADM2, DIM, CC2, NT, LC, \ |
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SHORT_FORM, GENERIC, SORT_NAME, FULL_NAME, FULL_NAME_ND, \ |
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MODIFY_DATE = line.split('\t') |
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RC = int(RC) |
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UFI = int(UFI) |
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UNI = int(UNI) |
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DD_LAT = float(DD_LAT) |
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DD_LONG = float(DD_LONG) |
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try: PC = int(PC) |
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except: PC = None |
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try: DIM = int(DIM) |
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except: DIM = None |
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obj = shapelib.SHPObject(shapelib.SHPT_POINT, i, [[(DD_LONG, DD_LAT)]]) |
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shp.write_object(-1, obj) |
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dbf.write_record(i, { 'RC': RC, 'UFI': UFI, 'UNI': UNI, 'UTM': UTM, |
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'JOG': JOG, 'FC': FC, 'DSG': DSG, 'PC': PC, |
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'CC1': CC1, 'ADM1': ADM1, 'ADM2': ADM2, |
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'DIM': DIM, 'CC2': CC2, 'NT': NT, 'LC': LC, |
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'SHORT_FORM': SHORT_FORM, 'GENERIC': GENERIC, |
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'SORT_NAME': SORT_NAME, 'FULL_NAME': FULL_NAME, |
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'FULL_ND': FULL_NAME_ND, |
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'MODIFY_DAT': MODIFY_DATE}) |
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i += 1 |
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del shp |
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del dbf |
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return i |
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def gns2shp_dialog(context): |
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"""Request filename from user, run conversion and add |
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resulting shapefile to the current map. |
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context -- The Thuban context. |
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""" |
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dlg = wxFileDialog(context.mainwindow, |
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_('Select GNS file'), '.', '', |
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_('Generate Files (*.txt)|*.txt|') + |
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_('All Files (*.*)|*.*'), |
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wxOPEN|wxOVERWRITE_PROMPT) |
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if dlg.ShowModal() == wxID_OK: |
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gns_filename = dlg.GetPath() |
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dlg.Destroy() |
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else: |
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return |
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no = gns2shp(gns_filename, gns_filename[:-4]) |
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if no <= 0: |
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context.mainwindow.RunMessageBox(_('gns2shp'), _('Conversion failed')) |
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return |
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else: |
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context.mainwindow.RunMessageBox(_('gns2shp %s') % __version__, |
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_('%d locations converted' % no)) |
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# Now load the newly created shapefile |
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filename = gns_filename[:-4] + '.shp' |
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title = os.path.splitext(os.path.basename(filename))[0] |
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map = context.mainwindow.canvas.Map() |
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has_layers = map.HasLayers() |
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try: |
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store = context.session.OpenShapefile(filename) |
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except IOError: |
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# the layer couldn't be opened |
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context.mainwindow.RunMessageBox(_('Add GNS Layer'), |
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_("Can't open the file '%s'.") % filename) |
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else: |
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layer = Layer(title, store) |
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map.AddLayer(layer) |
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if not has_layers: |
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# if we're adding a layer to an empty map, fit the |
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# new map to the window |
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context.mainwindow.canvas.FitMapToWindow() |
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if __name__ == '__main__': # gns2shp executed as a command line tool |
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print 'gns2shp.py %s' % __version__ |
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if len(sys.argv) == 3: |
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no = gns2shp(sys.argv[1], sys.argv[2][:-4]) |
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print '%d locations converted' % no |
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sys.exit(0) |
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else: |
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print 'usage: gns2shp.py GNS-file Shapefile' |
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sys.exit(1) |
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# gns2shp executed as an extension to Thuban |
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# register the new command |
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registry.Add(Command('gns2shp', _('gns2shp...'), gns2shp_dialog, |
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helptext = _('Convert GNS-file into a shapefile'))) |
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# find the extensions menu (create it anew if not found) |
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extensions_menu = main_menu.FindOrInsertMenu('extensions', _('E&xtensions')) |
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# finally add the new entry to the extensions menu |
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extensions_menu.InsertItem('gns2shp') |
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