Info gdal 20150915
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GDAL (Geospatial Data Abstraction Library) is a translator library for raster and vector geospatial data formats. It supports over 140 raster and vector data formats and has tools for data translation and processing. Key GDAL utilities include gdalinfo for reporting metadata, gdal_translate for format conversion, gdalwarp for image warping and projection changes, and gdal_merge for mosaicking multiple rasters. GDAL is open source and works across many operating systems.
Info gdal 20150915
- 1. А.Батчимэг [email protected] GDAL Geospatial Data Abstraction Library https://www.gdal.org Сэдэв: Хиймэл дагуулын мэдээ боловсруулалтанд дүрс мэдээний GDAL санг ашиглан анхан шатны боловсруулалтыг хагас автоматжуулах 2015.09.23 www.icc.mn http://geomedeelel.blogspot.com
- 2. Content 1. What is the GDAL/OGR? 2. Operating system 3. Available as command line utilities 4. GDAL Raster Formats 5. GDAL Utilities a. gdalinfo b. gdal_translate c. gdalwarp d. gdal_merge
- 3. What is the GDAL/OGR? Raster (GDAL - Geospatial Data Abstraction Library) Vector (OGR - OpenGIS Simple Features Reference) Tools for reading, writing, and processing Started in 1998 by Frank Warmerdam as a sole developer Now a project under OSGeo's umbrella Has 10 personal, 26 corporate contributing developers
- 4. Operating System Windows (32 & 64 bit) MAC OS X Linux
- 5. tools as command line utilities FWToolsOSGeo http://www.osgeo.org/ http://fwtools.maptools.org/ Geospatial Libraries FDO GDAL/OGR GEOS GeoTools OSSIM PostGIS Subpackages OpenEV MapServer GDAL/OGR PROJ.4 OGDI Python
- 6. Энгийн зурган файл: jpeg, png, gif Орон зайн мэдээллийн файл: GeoTIFF, .img, NITF Өгөгдлийн сан удирдах систем: Oracle Raster, PostGIS Raster Веб сервер: WMS, WCS, OPeNDAP Радар: CEOS, Envisat Агуулагч(Container): HDF4, HDF5, NetCDF Тусгай(Special): In-memory, VRT Гэх мэт 142 форматтай. GDAL Raster Formats
- 7. Software Using GDAL QGIS ArcGIS 9.2+ GRASS GIS MapServer IDRISI pktools http://trac.osgeo.org/gdal/wiki/SoftwareUsingGdal MapGuide Google Earth OSSIM ERDAS OpenEV gvSIG
- 8. GDAL Utilities gdalinfo - report information about a file. gdal_translate - Copy a raster file, with control of output format. gdaladdo - Add overviews to a file. gdalwarp - Warp an image into a new coordinate system. gdaltindex - Build a MapServer raster tileindex. gdalbuildvrt - Build a VRT from a list of datasets. gdal_contour - Contours from DEM. gdaldem - Tools to analyze and visualize DEMs. rgb2pct.py - Convert a 24bit RGB image to 8bit paletted. pct2rgb.py - Convert an 8bit paletted image to 24bit RGB. gdal_merge.py - Build a quick mosaic from a set of images. gdal2tiles.py - Create a TMS tile structure, KML and simple web viewer. gdal_rasterize - Rasterize vectors into raster file. gdaltransform - Transform coordinates. Nearblack - Convert nearly black/white borders to exact value. gdal_grid - Create raster from the scattered data. gdal_polygonize.py - Generate polygons from raster. gdal_sieve.py - Raster Sieve filter. gdal_fillnodata.py - Interpolate in nodata regions. gdal-config - Get options required to build software using GDAL.
- 9. gdalinfo The gdalinfo program lists various information about a GDAL supported raster dataset. The gdalinfo will report all of the following (if known): The format driver used to access the file. Raster size (in pixels and lines). The coordinate system for the file (in OGC WKT). The geotransform associated with the file (rotational coefficients are currently not reported). Corner coordinates in georeferenced, and if possible lat/long based on the full geotransform (but not GCPs). Ground control points. File wide (including subdatasets) metadata. Band data types. Band color interpretations. Band block size. Band descriptions. Band min/max values (internally known and possibly computed). Band checksum (if computation asked). Band NODATA value. Band overview resolutions available. Band unit type (i.e.. "meters" or "feet" for elevation bands). Band pseudo-color tables.
- 10. Gdalinfo example
- 11. gdal_translate The gdal_translate utility can be used to convert raster data between different formats, potentially performing some operations like subsettings, resampling, and rescaling pixels in the process. gdal_translate -of GTiff test.hdf test.tif gdal_translate -of jpeg test.hdf test.jpg Des:// -of Output format
- 12. gdalwarp The gdalwarp utility is an image mosaicing, reprojection and warping utility. The program can reproject to any supported projection, and can also apply GCPs stored with the image if the image is "raw" with control information. Mosaicing into an existing output file is supported if the output file already exists. gdalwarp -of GTIFF -t_srs ‘+proj=goelocation +zone=48 +datum=WGS84’ /EPSG:4326/ HDF4_EOS:EOS_GRID:"""MOD10A1.A2015056.h26v04.005.2007163070421. hdf""":MOD_Grid_Snow_500m:Snow_Cover_Daily_Tile MOD10A1.A2015056_geo_Snow_Cover_Daily_Tile.tif gdalwarp -of GTIFF -t_srs ‘+proj=utm +zone=48 +datum=WGS84’ /EPSG:32648/ HDF4_EOS:EOS_GRID:""" MOD10A1.A2015056.h26v04.005.2007163070421.hdf """:MOD_Grid_Snow_500m:Snow_Cover_Daily_Tile MOD10A1.A2015056_geo_Snow_Cover_Daily_Tile.tif
- 13. Gdal_merge example This utility will automatically mosaic a set of images. All the images must be in the same coordinate system and have a matching number of bands, but they may be overlapping, and at different resolutions. In areas of overlap, the last image will be copied over earlier ones. gdal_merge.py –n 0 -o out.tif in1.tif in2.tif Des:// -n nodata_value -o out_filename
- 14. MODIS – MOD13
- 16. Thank you for Attention