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Add nc_dittt/ grids for New Caledonia (fixes #14)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| #!/usr/bin/env python | ||
| ############################################################################### | ||
| # $Id$ | ||
| # | ||
| # Project: PROJ | ||
| # Purpose: Convert New Caledonia geocentric gr3dnc02b.mnt grid | ||
| # Author: Even Rouault <even.rouault at spatialys.com> | ||
| # | ||
| ############################################################################### | ||
| # Copyright (c) 2019, Even Rouault <even.rouault at spatialys.com> | ||
| # | ||
| # Permission is hereby granted, free of charge, to any person obtaining a | ||
| # copy of this software and associated documentation files (the "Software"), | ||
| # to deal in the Software without restriction, including without limitation | ||
| # the rights to use, copy, modify, merge, publish, distribute, sublicense, | ||
| # and/or sell copies of the Software, and to permit persons to whom the | ||
| # Software is furnished to do so, subject to the following conditions: | ||
| # | ||
| # The above copyright notice and this permission notice shall be included | ||
| # in all copies or substantial portions of the Software. | ||
| # | ||
| # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | ||
| # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | ||
| # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
| # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | ||
| # DEALINGS IN THE SOFTWARE. | ||
| ############################################################################### | ||
|
|
||
| from osgeo import gdal | ||
| from osgeo import osr | ||
| import datetime | ||
| import struct | ||
|
|
||
| with open('gr3dnc02b.mnt', 'rt') as f: | ||
| count_val_rows = 0 | ||
| line_no = 0 | ||
| for l in f.readlines(): | ||
| if l[-1] == '\n': | ||
| l = l[0:-1] | ||
| if l[-1] == '\r': | ||
| l = l[0:-1] | ||
| if not l: | ||
| continue | ||
| if line_no == 0: | ||
| tokens = [] | ||
| for t in l.split(' '): | ||
| if t: | ||
| tokens.append(t) | ||
| assert len(tokens) >= 13 | ||
| minx = float(tokens[0]) | ||
| maxx = float(tokens[1]) | ||
| miny = float(tokens[2]) | ||
| maxy = float(tokens[3]) | ||
| resx = float(tokens[4]) | ||
| resy = float(tokens[5]) | ||
| assert minx < maxx | ||
| assert miny < maxy | ||
| assert resx > 0 | ||
| assert resy > 0 | ||
| cols = 1 + (maxx - minx) / resx | ||
| assert cols - int(cols + 0.5) < 1e-10 | ||
| cols = int(cols + 0.5) | ||
| rows = 1 + (maxy - miny) / resy | ||
| assert rows - int(rows + 0.5) < 1e-10 | ||
| rows = int(rows + 0.5) | ||
| ds = gdal.GetDriverByName('GTiff').Create( | ||
| '/vsimem/gr3dnc02b.tif', cols, rows, 3, gdal.GDT_Float32) | ||
| ds.SetMetadataItem( | ||
| 'TIFFTAG_COPYRIGHT', 'Derived from work by Service Topographique, DITTT, Government of New Caledonia. Open License https://www.etalab.gouv.fr/wp-content/uploads/2014/05/Open_Licence.pdf') | ||
| ds.SetMetadataItem('TIFFTAG_IMAGEDESCRIPTION', | ||
| 'Geocentric translation from IGN72 GRANDE TERRE (EPSG:4662) to RGNC91-93 (EPSG:4906). Converted from gr3dnc01b.mnt') | ||
| datetime = datetime.date.today().strftime("%Y:%m:%d %H:%M:%S") | ||
| ds.SetMetadataItem('TIFFTAG_DATETIME', datetime) | ||
| ds.SetMetadataItem('AREA_OR_POINT', 'Point') | ||
| ds.SetMetadataItem('TYPE', 'GEOCENTRIC_TRANSLATION') | ||
| ds.SetMetadataItem('area_of_use', 'New Caledonia') | ||
| ds.SetMetadataItem('source_crs_wkt', """GEODCRS["IGN72 Grande Terre", | ||
| DATUM["IGN72 Grande Terre", | ||
| ELLIPSOID["International 1924",6378388,297, | ||
| LENGTHUNIT["metre",1]], | ||
| ID["EPSG",6634]], | ||
| PRIMEM["Greenwich",0, | ||
| ANGLEUNIT["degree",0.0174532925199433], | ||
| ID["EPSG",8901]], | ||
| CS[Cartesian,3], | ||
| AXIS["(X)",geocentricX, | ||
| ORDER[1], | ||
| LENGTHUNIT["metre",1]], | ||
| AXIS["(Y)",geocentricY, | ||
| ORDER[2], | ||
| LENGTHUNIT["metre",1]], | ||
| AXIS["(Z)",geocentricZ, | ||
| ORDER[3], | ||
| LENGTHUNIT["metre",1]]]""") | ||
| ds.SetMetadataItem('target_crs_epsg_code', '4906') | ||
| ds.SetGeoTransform( | ||
| [minx - resx/2, resx, 0, maxy + resy/2, 0, -resy]) | ||
| ds.GetRasterBand(1).SetUnitType('metre') | ||
| ds.GetRasterBand(1).SetDescription('x_translation') | ||
| ds.GetRasterBand(2).SetUnitType('metre') | ||
| ds.GetRasterBand(2).SetDescription('y_translation') | ||
| ds.GetRasterBand(3).SetUnitType('metre') | ||
| ds.GetRasterBand(3).SetDescription('z_translation') | ||
| sr = osr.SpatialReference() | ||
| sr.ImportFromEPSG(4749) | ||
| ds.SetProjection(sr.ExportToWkt()) | ||
| else: | ||
| tokens = [] | ||
| for t in l.split('\t'): | ||
| if t: | ||
| tokens.append(t) | ||
| assert len(tokens) == 6 | ||
| lon = float(tokens[0]) | ||
| lat = float(tokens[1]) | ||
| dx = float(tokens[2]) | ||
| dy = float(tokens[3]) | ||
| dz = float(tokens[4]) | ||
| iy = (line_no - 1) % rows | ||
| ix = (line_no - 1) // rows | ||
| assert abs(lon - (minx + ix * resx) | ||
| ) < 1e-10, (line_no, lon, minx + ix * resx) | ||
| assert abs(lat - (miny + iy * resy) | ||
| ) < 1e-10, (line_no, lat, miny + iy * resy) | ||
| ds.GetRasterBand(1).WriteRaster( | ||
| ix, rows - iy - 1, 1, 1, struct.pack('f', dx)) | ||
| ds.GetRasterBand(2).WriteRaster( | ||
| ix, rows - iy - 1, 1, 1, struct.pack('f', dy)) | ||
| ds.GetRasterBand(3).WriteRaster( | ||
| ix, rows - iy - 1, 1, 1, struct.pack('f', dz)) | ||
| count_val_rows += 1 | ||
|
|
||
| line_no += 1 | ||
|
|
||
| assert count_val_rows == rows * cols | ||
| gdal.GetDriverByName('GTiff').CreateCopy('gr3dnc02b.tif', ds, options=[ | ||
| 'COMPRESS=DEFLATE', 'PREDICTOR=3', 'INTERLEAVE=BAND']) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| # nc_dittt_README.txt | ||
|
|
||
| The files in this section result from the conversion of datasets originating | ||
| from [Gouvernement de la Nouvelle-Calédonie – DITTT](https://dittt.gouv.nc/circe-pour-la-nouvelle-caledonie) | ||
|
|
||
| ## Included grids | ||
|
|
||
| ### New Caledonia: IGN72 GRANDE TERRE (EPSG:4662) to RGNC91-93 (EPSG:4906) (using Geocentric correction) | ||
|
|
||
| *Source*: Gouvernement de la Nouvelle-Calédonie – DITTT](https://dittt.gouv.nc/circe-pour-la-nouvelle-caledonie) | ||
| *Format*: GeoTIFF converted from .mnt file with convert_gr3dnc01b.py | ||
| *License*: [License Ouverte (in French)](https://www.etalab.gouv.fr/wp-content/uploads/2017/04/ETALAB-Licence-Ouverte-v2.0.pdf) / [Open License (English translation)](https://www.etalab.gouv.fr/wp-content/uploads/2014/05/Open_Licence.pdf) | ||
| *Used by*: [EPSG:9329 Transformation](https://www.epsg-registry.org/export.htm?gml=urn:ogc:def:coordinateOperation:EPSG::9329) | ||
|
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||
| * nc_dittt_gr3dnc01b.tif | ||
|
|
||
| ### New Caledonia - Noumea: IGN72 GRANDE TERRE (EPSG:4662) to RGNC91-93 (EPSG:4906) (using Geocentric correction) | ||
|
|
||
| *Source*: Gouvernement de la Nouvelle-Calédonie – DITTT](https://dittt.gouv.nc/circe-pour-la-nouvelle-caledonie) | ||
| *Format*: GeoTIFF converted from .mnt file with convert_gr3dnc02b.py | ||
| *License*: [License Ouverte (in French)](https://www.etalab.gouv.fr/wp-content/uploads/2017/04/ETALAB-Licence-Ouverte-v2.0.pdf) / [Open License (English translation)](https://www.etalab.gouv.fr/wp-content/uploads/2014/05/Open_Licence.pdf) | ||
| *Used by*: [EPSG:9330 Transformation](https://www.epsg-registry.org/export.htm?gml=urn:ogc:def:coordinateOperation:EPSG::9330) | ||
|
|
||
| * nc_dittt_gr3dnc02b.tif | ||
|
|
||
| ### New Caledonia - Noumea: NEA74 Noumea (EPSG:4644) to RGNC91-93 (EPSG:4906) (using Geocentric correction) | ||
|
|
||
| *Source*: Gouvernement de la Nouvelle-Calédonie – DITTT](https://dittt.gouv.nc/circe-pour-la-nouvelle-caledonie) | ||
| *Format*: GeoTIFF converted from .mnt file with convert_gr3dnc03a.py | ||
| *License*: [License Ouverte (in French)](https://www.etalab.gouv.fr/wp-content/uploads/2017/04/ETALAB-Licence-Ouverte-v2.0.pdf) / [Open License (English translation)](https://www.etalab.gouv.fr/wp-content/uploads/2014/05/Open_Licence.pdf) | ||
| *Used by*: [EPSG:9328 Transformation](https://www.epsg-registry.org/export.htm?gml=urn:ogc:def:coordinateOperation:EPSG::9328) | ||
|
|
||
| * nc_dittt_gr3dnc03a.tif |
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