news.html

gdal库的学习文档

gdalwarp:
 - Added proper support <span class="keywordflow">for</span> <span class="stringliteral">"unified source nodata"</span>, so the -srcnodata
   <span class="keywordflow">switch</span> works well. 

RIK Driver: 
 - New Swedish format driver implemented by Daniel Wallner.

JPEG Driver:
 - Substantial improvements to EXIF support.  

MrSID Driver:
 - Updated with proper JPEG2000 support as JP2MRSID driver, including 
   encoding with ESDK.
 - Updated to support MrSID Version 5.x SDKs.

PNG Driver:
 - Fixed serious bugs with 16bit file support. 
 - Added NODATA_VALUES to identify RGB sets that indicate a nodata pixel.


OGR 1.3.1 - Overview of Changes
-------------------------------

Reference Counting:
 - OGRSpatialReference and OGRFeatureDefn now honour reference counting 
   semantics.
 - Note that, especially <span class="keywordflow">for</span> the OGRFeatureDefn, it is now critical that
   all drivers be careful with reference counting.  Any OGR drivers not in
   the core distribution will likely crash <span class="keywordflow">if</span> not updated.

ESRI Personal Geodatabase Driver:
 - New driver implemented <span class="keywordflow">for</span> ESRI Personal Geodatabase (.mdb) files. 
 - Uses ODBC, enabled by <span class="keywordflow">default</span> on win32. 

ODBC Driver:
 - Updated to support binary fields. 
 - Updated to support WKB geometry fields. 
 - Updated to support DSN-less connections. 

S57 Driver:
 - Added support <span class="keywordflow">for</span> Inland Waterways, and Additional Military Layers profiles


===============================================================================

GDAL 1.3.0 - Overview of Changes
--------------------------------

Multithreading:
 - Lots of work done to implement support <span class="keywordflow">for</span> multiple threads reading
   from distinct <a class="code" href="classGDALDataset.html">GDALDataset</a> objects at the same time. 

<a class="code" href="classGDALRasterBand.html">GDALRasterBand</a> / Persistant Auxilary Metadata (PAM):
 - Support for preserving a variety of metadata in a supporting XML file. 
 - <a class="code" href="classGDALRasterBand.html">GDALRasterBand</a> now supports <span class="stringliteral">"remembering"</span> histograms, and has a concept
   of the default histogram. 
 - <a class="code" href="classGDALRasterBand.html">GDALRasterBand</a> now supports remembering image statistics.
 - Disabled by default (set GDAL_PAM_ENABLED=YES to turn on). 
 - Supported by *most* drivers with some caveats.

<a class="code" href="gdal_8h.html#14e39ec8cc3a962913673f984e0d5398">GDALCopyWords</a>(): 
 - This function is a low level work horse for copying and converting pixel 
   data in GDAL.  It has been substantially optimized by Steve Soule (Vexcel).

Next Generation Bindings:
 - Kevin Ruland and Howard Butler are working on reworked support for 
   SWIG to generate Python, PHP, Java, C# and other language bindings for GDAL
   and OGR. 

VB6 Bindings: 
 - Now substantially complete, see VB6 directory.

HDF5 Driver: 
 - New HDF5 driver implemented by Denis Nadeau. 

RMF Driver: 
 - New driver for Raster Matrix Format by Andrey Kislev. 

MSGN (Meteosat Second Generation Native) Driver:
 - New driver implemented by Frans van der Bergh.

VRT Driver:
 - Fixed whopper of a memory leak in warped raster case.

NetCDF Driver: 
 - Preliminary CF conventions support by Denis Nadeau.

NITF Driver:
 - NITF files between 2 and 4 GB in size can now be read and written.

JPEG Driver: 
 - Added support for reading EXIF as metadata by Denis Nadeau.

DODS Driver:
 - Fixed up libdap 3.5.x compatibility.

JP2ECW (JPEG2000 ECW SDK) Driver:
 - Implemented support for new GML-in-JPEG2000 specification.
 - Implemented support for old MSI <span class="stringliteral">"worldfile"</span> box. 

JP2KAK (JPEG2000 Kakadu) Driver:
 - Implemented support for new GML-in-JPEG2000 specification.
 - Implemented support for old MSI <span class="stringliteral">"worldfile"</span> box. 

PCIDSK Driver: 
 - tiled files now supported for reading.
 - overviews now supported for reading.

HFA (Imagine) Driver:
 - Supports creating internal overviews in very large files. 
 - Support reading class names. 
 - Support creating compressed files. 

GeoTIFF Driver:
 - Support reading files with odd bit depths (ie. 3, 12, etc). 
 - Support 16/24bit floating point TIFFs (per Technote 3) (Andrey).
 - Support 12bit jpeg compressed imagery using libjpeg <span class="stringliteral">"MK1"</span> library.

HDF4 Driver:
 - Added support for ASTER Level 1A, 1B and 2 products (Andrey). 


OGR 1.3.0 - Overview of Changes
-------------------------------

OGRGeometry:
 - WKT (and GML) encoding now attempts to preserve pretty much full double
   precision. 
 - geometries are now <span class="stringliteral">"coordinate dimension preserving"</span> rather than dynamically
   figuring out dimension depending on whether Z is set.  So a geometry can
   now be 3D even if all z values are zero.  
 - Fixed up proper EMPTY geometry support per standard.

GRASS Driver:  
 - New driver for GRASS 6 vector data written by Radim Blazek. 

Interlis Driver: 
 - New driver for Swiss Interlis format from Permin Kalberer (SourcePole).

Shape Driver:
 - Fixed logic for degenerate polygons (Baumann Konstantin).
 
PostgreSQL/PostGIS Driver:
 - Implemented fast GetExtent() method (Oleg Semykin).
 - Implemented layer type from geometry_columns (Oleg Semykin).
 - Handle PostGIS 1.0 requirements for coordinate dimemsion exactness.
 - Handle EWKT type in PostGIS 1.0.
 - Generally PostGIS 0.x and 1.0 should now be supported fairly gracefully.
 - Added PostGIS <span class="stringliteral">"binary cursor"</span> mode for faster geometry access.

VRT Driver:
 - Pass through attribute queries to underlying driver. 
 - Pass through spatial queries as attribute filters on the underlying layer.

S57 Driver:
 - Added concept of supporting different profiles. 
 - Added prototype AML profile support. 

MySQL Driver:
 - Fixed for FID recognition (eg. mediumint). 

GML Driver: 
 - Various fixes for generated GML correctness (Tom Kralidis).

TIGER/Line Driver:
 - Added Tiger 2004 support.

Oracle Driver:
 - Use VARCHAR2 for fixed size string fields. 
 - Use OCI_FID config variable when creating layers, and reading select results




===============================================================================

GDAL 1.2.6 - Overview of Changes
--------------------------------

gdal_translate: 
 - Added -sds switch to copy all subdatasets. 

gdalwarp: 
 - Added Thin Plate Spline support (-tps switch). 

<a class="code" href="classGDALRasterBand.html">GDALRasterBand</a>:
 - Now uses two level block cache allowing efficient access to files
   with a very large number of tiles. 
 - Added support for YCbCr color space for raster band color interpretations.
 - Added AdviseRead() method - currently only used by ECW driver and OGDI 
   drivers. 

ILWIS Driver:
 - New driver for the raster format of the ILWIS software. 

ECW Driver:
 - Updated to use ECW SDK 3.1 (older ECW SDK no longer supported!)

ECWJP2 Driver:
 - Added JPEG2000 support driver based on ECW/JPEG2000 SDK with a variety
   of features. 

NITF Driver: 
 - Added support for reading *and* writing JPEG2000 compressed NITF files 
   using the ECW/JPEG2000 SDK. 
 - Added ICHIPB support. 

HDF Driver:
 - Add support for georeferencing from some additional metadata formats. 
 - Fixed bug with multi-band HDF-EOS datasets. 

MrSID Driver:
 - Driver can now be built as a plugin on win32. 
 - Split out MrSID 3.x SDK support - not readily buildable now. 
 - Implemented accelerated IO cases for MrSID 4.x SDK. 
 - Support for writing MrSID files added (improved?)

Imagine Driver: 
 - Fixed bug reading some large multiband Imagine files. 
 - Added support for writing compressed files. 

Win32 Builds:
 - Added versioning information to GDAL DLL.

L1B Driver:
 - Only return a reduced grid of control points. 

IDA (WinDisp4) Driver:
 - New read/write driver for the Image Display and Analysis raster format 
   used by WinDisp 4. 

NDF (NLAPS) Driver:
 - Added NDF/NLAPS read driver for version 1 and 2. 

MSG Driver: 
 - Added support for the Metosat Second Generation raw file format.

GTiff Driver:
 - Added support for offset/scale being saved and loaded (special metadata). 
 - Added Cylindrical Equal Area.
 - Added PROFILE creation option to limit extra tags.

PNG Driver: 
 - Updated internal code for libpng to libpng 1.2.8.


OGR 1.2.6 - Overview of Changes
-------------------------------

OGRSFDriverRegistrar:
 - Added support for autoloading plugin drivers from ogr_&lt;driver&gt;.so. 

ogr.py:
 - Geometry, and Feature now take care of their own reference counting and
   will delete themselves when unreferenced.  Care must still be taken to
   unreference all features before destroying the corresponding 
   layer/datasource.
 - ogr.Feature fields can now be fetched and set directly as attributes. 
 - Geometry contructor can now take various formats (wkt, gml, and wkb). 
 - Added docstrings. 
 - Added better __str__ methods on several objects. 
 - Various other improvements. 

OGRLayer:
 - Re-wrote generic spatial search support to be faster in case of rectangular
   filters. 
 - Intersects() method now really uses GEOS.  This also affects all OGR 
   layer spatial filtering (with non-rectangular filters). 
 - Added SetNextByIndex() method on OGRLayer.  

OGRSpatialReference:
 - Automatically generate +towgs84 from EPSG tables when translating to
   PROJ.4 if available and TOWGS84 not specified in source WKT. 
 - Updated GML CRS translation to follow OGC 05-011 more closely.  Still
   incomplete but operational for some projections. 
 - Added support for FIPSZONE State Plane processing for old ESRI .prjs. 
 - Added Goode Homolosine support. 
 - Added GEOS (Geostationary Satellite) support.

OCI (Oracle) Driver:
 - Added GEOMETRY_NAME creation option to control the name of the field to
   hold the geometry.

PostGIS Driver:
 - Fixed some problems with truncation for integer and float list fields. 

Shapefile Driver: 
 - Added support for MapServer style spatial index (.qix). 

GML Driver: 
 - Improved support for 3L0 (GML 3 - Level 0 profile) reading and writing. 
   On read we can now use the .xsd instead of needing to build a .gfs file. 


===============================================================================

GDAL 1.2.5 - Overview of Changes
--------------------------------

gdalwarp Utility:
 - Added <span class="stringliteral">"proper"</span> source and destination alpha support. 

PCRaster Driver: 
 - added write support, now consider ready for regular use.

MrSID Driver:
 - Initial support for writing to MrSID with encoding SDK. 

GeoTIFF Driver:
 - Updated internal copy of libtiff to fix overview building ... really!
 - Fixed bug when writing south-up images.


OGR 1.2.5 - Overview of Changes
-------------------------------

OGRSpatialReference:
 - Added Bonne projection. 

Docs:
 - Added OGR C++ API Tutorial (reading and writing). 

PostGIS Driver:
 - Implemented SetFeature() and DeleteFeature() methods for in-place updates.

Oracle (OCI) Driver:
 - Fixed support for writing into Oracle 10g. 
 - Fixed serious memory leak of geometries. 
 - Fixed bug with 3D multipolygons. 
 - Added support for selecting tables in the datasource name.

===============================================================================

GDAL 1.2.4 - Overview of Changes
--------------------------------

gdalwarp: 
  - Fixed some issues with only partially transformable regions. 
  - Added Alpha mask generation support (-dstalpha switch).

HFA/Imagine Driver:
  - bug fix in histogram handling.
  - improved support for large colormaps. 

Envi Driver:
  - Capture category names and colormaps when reading.

SAR CEOS Driver:
  - Added support for PALSAR/ALOS Polarimetric Datasets. 

RadarSat 2 Driver:
  - New.  Reads RadarSat 2 Polarimetric datasets with a <span class="stringliteral">"product.xml"</span> and 
    imagery in TIFF files. 

OGDI Driver:
  - Important bug fix for downsampled access.

GeoTIFF Driver:
  - Lots of libtiff upgrades, including some quite serious bug fixes.
  - Added better support for 16bit colormaps. 
  - Write projection information even if we don't have a geotransform or GCPs.
  - Improved alpha support.
  - Generate graceful error message for BigTIFF files. 

DODS Driver:
  - Almost completely reimplemented.   Uses chunk-by-chunk access.  Supports
    reading several bands from seperate objects.  Some new limitations too.

NetCDF Driver:
  - Seperated out a GMT NetCDF driver and a more generic but partially broken
    NetCDF driver (Radim).

JP2KAK Driver:
  - Added alpha support, including greyscale+alpha. 

AirSAR Driver:
  - New, reads AirSAR Polarimetric Radar format. 



OGR 1.2.4 - Overview of Changes
-------------------------------

epsg_tr.py: 
  - Added escaping rules when generating PostGIS output.

tigerpoly.py:
  - Discard dangles and degenerate rings. 

VRT Driver:
  - Fixed serious error in handling cleanup of VRT datasources, was often 
   causing a crash.

SQLLite Driver:
  - Fixed substantial memory leaks. 

MySQL Driver: