= GDAL/OGR 2.1.2 Release Notes = 

The 2.1.2 release is a bug fix release.

== Port ==
* Fix deadlock at CPLWorkerThreadPool destruction (#6646)
* CPLGetSymbol() on Windows: honour GDAL_FILENAME_IS_UTF8 setting to call
  LoadLibraryW() (#6650)
* /vsicurl/: take CPL_VSIL_CURL_ALLOWED_EXTENSIONS into account even if
  GDAL_DISABLE_READDIR_ON_OPEN is defined (#6681)
* Fix regression in PLScenes V1 raster random access. Add a CPL_VSIL_CURL_ALLOWED_FILENAME config option to solve that (fixes #6691)
* /vsimem/: fix potential crash when closing -different- handles pointing to the same file from different threads (fixes #6683)

== GDAL Core ==
* Nodata comparison: fix test when nodata is FLT_MIN or DBL_MIN (#6578)
* External overview: fix incorrect overview building when generating from greater
  overview factors to lower ones, in compressed and single-band case (#6617)
* Make sure that GDALSetCacheMax() initialize the raster block mutex (#6611)
* Fix potential deadlock in multithreaded writing scenarios (#6661)
* Make multi-threaded reading/writing when using GetLockedBlock()/MarkDirty()/
  DropLock() lower level interfaces (#6665)
* Fix multi-threading issues in read/write scenarios (fixes #6684)

== Utilities ==
* gdal_translate & gdalwarp: lower the default value of GDAL_MAX_DATASET_POOL_SIZE
  to 100 on MacOSX (#6604)
* gdalwarp: when -to RPC_DEM is specified, make -et default to 0 as documented (#6608)
* gdalwarp: fix failure with cutline on a layer of touching polygons (#6694)
* gdal_translate: when using -projwin with default nearest neighbour resampling,
  align on integer source pixels (#6610)
* gdal2xyz: use %d formatting for Int32/UInt32 data types (#6644)

== GDAL drivers ==

AIGRID driver:
* fix 2.1.0 regression when reading statistics (.sta) file with only 3 values,
  and fix <2.1 behaviour to read them in LSB order (#6633)

ENVI driver:
* on closing, pad image file with trailing nul bytes if needed (#6662)

GeoRaster driver:
* fix for geotransform matrix with rotation terms (#6593)

GPKG driver:
* check if transaction COMMIT is successful (#6667)
* fix crash on overview building on big overview factor (#6668)

GTiff driver:
* fix saving and loading band description (#6592)
* avoid reading external metadata file that could be related to the target
  filename when using Create() or CreateCopy() (#6594)
* do not generate erroneous ExtraSamples tag when translating from a RGB UInt16,
  without explicit PHOTOMETRIC=RGB (#6647)

HDF4 driver:
* Fixed erroneous type casting in HDF4Dataset::AnyTypeToDouble() breaking reading
  georeference data and some other metadata from HDF4-EOS datasets (#6618)

HDF5 driver:
* correct number of GCPs to avoid dummy trailing (0,0)->(0,0,0) and remove +180
  offset applied to GCP longitude. Add instead a heuristics to determine if the
  product is crossing the antimeridian, and a HDF5_SHIFT_GCPX_BY_180 config option
  to be able to override the heuristics (#6666)

ISCE driver:
* make parsing of properties case insensitive (#6637)

netCDF driver:
* fix crash on datasets with 1D variable with 0 record (#6645)

RMF driver:
* fix wrong counter decrement that caused compressed RMF to be incorrectly
  decompressed (https://github.com/OSGeo/gdal/pull/153)
* fix load/store inversion of cm and dm units in MTW files (https://github.com/OSGeo/gdal/pull/162)

ROI_PAC driver:
* fix computation of line offset for multi-band BIP files, and warn if detecting
  a wrong file produced by GDAL >= 2.0.0 (#6591)

SRTMHGT driver:
* accept filenames like NXXEYYY.SRTMGL1.hgt (#6614)

VRT driver:
* make CheckCompatibleForDatasetIO() return FALSE on VRTDerivedRasterBands (#6599)
* fix performance issue when nodata set at band level and non-nearest resampling used (#6628)
* VRTComplexSource: do temp computations on double to avoid precision issues
  when band data type is Int32/UInt32/CInt32/Float64/CFloat64 (#6642)

== OGR utilities ==
* GDALVectorTranslate(): imply update mode if access mode not explicitly
  specified and hDstDS != NULL (#6612)

== OGR drivers == 

Multi driver fix:
* GPKG/SQLite/PG/FileGDB/MEM: properly set/reset field subtype with AlterFieldDefn() (fixes #6689)

Carto driver:
* rebranded from CartoDB to Carto. "CartoDB" is still a valid alias to Carto

GPKG:
* update schema to reflect CURRENT_TIMESTAMP -> 'now' changes (https://github.com/OSGeo/gdal/pull/155)
* do not emit error when running ExecuteSQL() with a spatial filter on an empty
  layer (#6639)
* list (non spatial) layers not registered in gpkg_contents (#6679)
* robustified layer deletion and renaming (#6679)
* implementation of DeleteField, AlterFieldDefn and ReorderFields (#6679)
* GetExtent() to save computed extent in gpkg_contents if empty (#6679)
* add 'RECOMPUTE EXTENT ON' special SQL (#6679)
* update last modified date on tiles update (#6679) 
* check identifier unicity on layer creation (#6679)
* add possibility to disable foreign key check by setting
  OGR_GPKG_FOREIGN_KEY_CHECK=NO config option (#6679)
* add HasSpatialIndex(tblname,geomcolname) SQL function (#6679)

GML driver:
* remove hack for CityGML regarding forcing srsDimension to 3 if not specified.
  Instead add a GML_SRS_DIMENSION_IF_MISSING config option that can be set to
  3 if needed (#6597)
* consider srsName with URL like 'http://www.opengis.net/def/crs/EPSG/0/' as
  following EPSG axis order. Add SWAP_COORDINATES=YES/NO/AUTO (and
  GML_SWAP_COORDINATES configuration option) to override all auto guessing (#6678)

ILI1 driver:
* fix crash in OGRILI1Layer::JoinSurfaceLayer() when the multicurve of the feature of the poSurfaceLineLayer layer is empty (fixes #6688)

MSSQLSpatial driver:
* Fix select layer to recognize geometry column with sqlncli (#6641)

NAS driver:
* Fix to handle that 'anlass' is optional

OCI driver:
* 3 new options: MULTI_LOAD, MULTI_LOAD_COUNT, FIRST_ID (#6606)

OSM driver:
* fix issue garbage content when laundering tag name with column (https://github.com/OSGeo/gdal/pull/161)

PG driver:
* fix errors caused by missing geometry_columns/spatial_ref_sys tables in non
  PostGIS databases, that prevent reading more than 500 features (http://hub.qgis.org/issues/10904)

PLScenes driver:
* add HTTP retry logic (#6655)
* V0 API: workaround limitations on filtering on image_statistics.image_quality (#6657)

S57 driver:
* fix GDAL 2.1.1 regression where open options are ignored if OGR_S57_OPTIONS
  config option is not defined (#6609)

Shapefile driver:
* change REPACK implementation on Windows to be robust to remaining file
  descriptors opened on the .shp/.shx/.dbf (#6672)

SQLite driver:
* do not emit error when running ExecuteSQL() with a spatial filter on an
  empty layer (#6639)
* Spatialite: avoid crash when creating layer with geom_type = wkbCurve (#6660)
* don't touch nSoftTransactionLevel in DoTransactionCommand() in case of error,
  since it can cause later CPLAssert() to trigger (#6667)

XLSX driver:
* only list worksheets (and no charts) as layers (#6680)