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287 lines
10 KiB
C++
287 lines
10 KiB
C++
/******************************************************************************
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* $Id: loslasdataset.cpp 27384 2014-05-24 12:28:12Z rouault $
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*
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* Project: Horizontal Datum Formats
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* Purpose: Implementation of NOAA/NADCON los/las datum shift format.
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* Author: Frank Warmerdam, warmerdam@pobox.com
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* Financial Support: i-cubed (http://www.i-cubed.com)
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*
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******************************************************************************
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* Copyright (c) 2010, Frank Warmerdam
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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****************************************************************************/
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#include "rawdataset.h"
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#include "cpl_string.h"
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#include "ogr_srs_api.h"
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CPL_CVSID("$Id: loslasdataset.cpp 27384 2014-05-24 12:28:12Z rouault $");
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/**
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NOAA .LOS/.LAS Datum Grid Shift Format
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All values are little endian
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Header
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------
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char[56] "NADCON EXTRACTED REGION"
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char[8] "NADGRD "
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int32 grid width
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int32 grid height
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int32 z count (1)
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float32 origin longitude
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float32 grid cell width longitude
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float32 origin latitude
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float32 grid cell height latitude
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float32 angle (0.0)
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Data
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----
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int32 ? always 0
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float32*gridwidth offset in arcseconds.
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Note that the record length is always gridwidth*4 + 4, and
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even the header record is this length though it means some waste.
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**/
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/************************************************************************/
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/* ==================================================================== */
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/* LOSLASDataset */
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/* ==================================================================== */
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/************************************************************************/
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class LOSLASDataset : public RawDataset
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{
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public:
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VSILFILE *fpImage; // image data file.
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int nRecordLength;
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double adfGeoTransform[6];
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public:
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LOSLASDataset();
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~LOSLASDataset();
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virtual CPLErr GetGeoTransform( double * padfTransform );
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virtual const char *GetProjectionRef();
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static GDALDataset *Open( GDALOpenInfo * );
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static int Identify( GDALOpenInfo * );
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};
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/************************************************************************/
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/* ==================================================================== */
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/* LOSLASDataset */
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/* ==================================================================== */
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/************************************************************************/
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/************************************************************************/
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/* LOSLASDataset() */
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/************************************************************************/
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LOSLASDataset::LOSLASDataset()
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{
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fpImage = NULL;
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}
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/************************************************************************/
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/* ~LOSLASDataset() */
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/************************************************************************/
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LOSLASDataset::~LOSLASDataset()
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{
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FlushCache();
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if( fpImage != NULL )
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VSIFCloseL( fpImage );
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}
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/************************************************************************/
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/* Identify() */
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/************************************************************************/
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int LOSLASDataset::Identify( GDALOpenInfo *poOpenInfo )
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{
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if( poOpenInfo->nHeaderBytes < 64 )
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return FALSE;
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if( !EQUAL(CPLGetExtension(poOpenInfo->pszFilename),"las")
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&& !EQUAL(CPLGetExtension(poOpenInfo->pszFilename),"los") )
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return FALSE;
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if( !EQUALN((const char *)poOpenInfo->pabyHeader + 56, "NADGRD", 6 ) )
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return FALSE;
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return TRUE;
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}
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/************************************************************************/
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/* Open() */
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/************************************************************************/
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GDALDataset *LOSLASDataset::Open( GDALOpenInfo * poOpenInfo )
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{
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if( !Identify( poOpenInfo ) )
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return NULL;
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/* -------------------------------------------------------------------- */
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/* Create a corresponding GDALDataset. */
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/* -------------------------------------------------------------------- */
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LOSLASDataset *poDS;
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poDS = new LOSLASDataset();
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/* -------------------------------------------------------------------- */
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/* Open the file. */
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/* -------------------------------------------------------------------- */
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poDS->fpImage = VSIFOpenL( poOpenInfo->pszFilename, "rb" );
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if( poDS->fpImage == NULL )
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{
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delete poDS;
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return NULL;
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}
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/* -------------------------------------------------------------------- */
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/* Read the header. */
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/* -------------------------------------------------------------------- */
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VSIFSeekL( poDS->fpImage, 64, SEEK_SET );
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VSIFReadL( &(poDS->nRasterXSize), 4, 1, poDS->fpImage );
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VSIFReadL( &(poDS->nRasterYSize), 4, 1, poDS->fpImage );
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CPL_LSBPTR32( &(poDS->nRasterXSize) );
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CPL_LSBPTR32( &(poDS->nRasterYSize) );
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if (!GDALCheckDatasetDimensions(poDS->nRasterXSize, poDS->nRasterYSize))
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{
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delete poDS;
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return NULL;
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}
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VSIFSeekL( poDS->fpImage, 76, SEEK_SET );
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float min_lon, min_lat, delta_lon, delta_lat;
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VSIFReadL( &min_lon, 4, 1, poDS->fpImage );
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VSIFReadL( &delta_lon, 4, 1, poDS->fpImage );
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VSIFReadL( &min_lat, 4, 1, poDS->fpImage );
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VSIFReadL( &delta_lat, 4, 1, poDS->fpImage );
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CPL_LSBPTR32( &min_lon );
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CPL_LSBPTR32( &delta_lon );
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CPL_LSBPTR32( &min_lat );
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CPL_LSBPTR32( &delta_lat );
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poDS->nRecordLength = poDS->nRasterXSize * 4 + 4;
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/* -------------------------------------------------------------------- */
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/* Create band information object. */
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/* */
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/* Note we are setting up to read from the last image record to */
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/* the first since the data comes with the southern most record */
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/* first, not the northernmost like we would want. */
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/* -------------------------------------------------------------------- */
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poDS->SetBand(
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1, new RawRasterBand( poDS, 1, poDS->fpImage,
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poDS->nRasterYSize * poDS->nRecordLength + 4,
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4, -1 * poDS->nRecordLength,
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GDT_Float32,
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CPL_IS_LSB, TRUE, FALSE ) );
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/* -------------------------------------------------------------------- */
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/* Setup georeferencing. */
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/* -------------------------------------------------------------------- */
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poDS->adfGeoTransform[0] = min_lon - delta_lon*0.5;
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poDS->adfGeoTransform[1] = delta_lon;
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poDS->adfGeoTransform[2] = 0.0;
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poDS->adfGeoTransform[3] = min_lat + (poDS->nRasterYSize-0.5) * delta_lat;
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poDS->adfGeoTransform[4] = 0.0;
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poDS->adfGeoTransform[5] = -1 * delta_lat;
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/* -------------------------------------------------------------------- */
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/* Initialize any PAM information. */
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/* -------------------------------------------------------------------- */
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poDS->SetDescription( poOpenInfo->pszFilename );
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poDS->TryLoadXML();
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/* -------------------------------------------------------------------- */
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/* Check for overviews. */
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/* -------------------------------------------------------------------- */
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poDS->oOvManager.Initialize( poDS, poOpenInfo->pszFilename );
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return( poDS );
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}
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/************************************************************************/
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/* GetGeoTransform() */
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/************************************************************************/
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CPLErr LOSLASDataset::GetGeoTransform( double * padfTransform )
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{
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memcpy( padfTransform, adfGeoTransform, sizeof(double)*6 );
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return CE_None;
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}
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/************************************************************************/
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/* GetProjectionRef() */
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/************************************************************************/
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const char *LOSLASDataset::GetProjectionRef()
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{
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return SRS_WKT_WGS84;
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}
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/************************************************************************/
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/* GDALRegister_LOSLAS() */
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/************************************************************************/
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void GDALRegister_LOSLAS()
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{
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GDALDriver *poDriver;
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if( GDALGetDriverByName( "LOSLAS" ) == NULL )
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{
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poDriver = new GDALDriver();
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poDriver->SetDescription( "LOSLAS" );
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poDriver->SetMetadataItem( GDAL_DCAP_RASTER, "YES" );
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poDriver->SetMetadataItem( GDAL_DMD_LONGNAME,
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"NADCON .los/.las Datum Grid Shift" );
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poDriver->SetMetadataItem( GDAL_DCAP_VIRTUALIO, "YES" );
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poDriver->pfnOpen = LOSLASDataset::Open;
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poDriver->pfnIdentify = LOSLASDataset::Identify;
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GetGDALDriverManager()->RegisterDriver( poDriver );
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}
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}
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