Using GDAL and OGR for data processing and analysis.pdf

Using GDAL / OGR for Data Processing and

Analysis

Roger Andre

May 2009

What the heck is “GDAL”?

GDAL is an open source programming library

and set of utilities that allow you to manipulate

raster data.



As a library, GDAL presents a single abstract

data model to the calling application for all

supported formats.



OGR is the vector analog, also comes with

GDAL



Main focus is on conversions between formats,

but that's just the tip of the iceberg.



Works in Windows, Linux and MacOS



GDAL Trivia

History: Development started by Frank

Warmerdam in 1998. Now officially maintained by

OSGEO.



How do you pronounce “GDAL”?



"I pronounce it "goodle". I had originally thought to call it the "Geospatial

Object Oriented Data Abstraction Library" (GOODAL) to make the right

sound obvious, but I was too lazy to type GOODAL all the time, so I

dropped the OO part. Most folks pronounce the library "gee-dal" which is

ok too but not my preference." - Frank Wamerdam

gdal_translate -of

VRT (rw+): Virtual Raster

GTiff (rw+): GeoTIFF

NITF (rw+): National Imagery Transmission Format

HFA (rw+): Erdas Imagine Images (.img)

ELAS (rw+): ELAS

AAIGrid (rw): Arc/Info ASCII Grid

DTED (rw): DTED Elevation Raster

PNG (rw): Portable Network Graphics

JPEG (rw): JPEG JFIF

MEM (rw+): In Memory Raster

GIF (rw): Graphics Interchange Format (.gif)

XPM (rw): X11 PixMap Format

BMP (rw+): MS Windows Device Independent Bitmap

PCIDSK (rw+): PCIDSK Database File

PCRaster (rw): PCRaster Raster File

ILWIS (rw+): ILWIS Raster Map

SRTMHGT (rw): SRTMHGT File Format

Leveller (rw+): Leveller heightfield

Terragen (rw+): Terragen heightfield

GMT (rw): GMT NetCDF Grid Format

netCDF (rw): Network Common Data Format

PNM (rw+): Portable Pixmap Format (netpbm)

ENVI (rw+): ENVI .hdr Labelled

EHdr (rw+): ESRI .hdr Labelled

PAux (rw+): PCI .aux Labelled

MFF (rw+): Vexcel MFF Raster

MFF2 (rw+): Vexcel MFF2 (HKV) Raster

BT (rw+): VTP .bt (Binary Terrain) 1.3 Format

IDA (rw+): Image Data and Analysis

ERS (rw+): ERMapper .ers Labelled

JPEG2000 (rw): JPEG-2000 part 1 (ISO/IEC 15444-1)

FIT (rw): FIT Image

RMF (rw+): Raster Matrix Format

RST (rw+): Idrisi Raster A.1

INGR (rw+): Intergraph Raster

GSAG (rw): Golden Software ASCII Grid (.grd)

GSBG (rw+): Golden Software Binary Grid (.grd)

USGSDEM (rw): USGS Optional ASCII DEM (and

CDED)

ADRG (rw+): ARC Digitized Raster Graphics

$ gdal_translate -of <output_format> <infile> <outfile>

ogr2ogr -f

-> "ESRI Shapefile" (read/write)

-> "MapInfo File" (read/write)

-> "TIGER" (read/write)

-> "S57" (read/write)

-> "DGN" (read/write)

-> "Memory" (read/write)

-> "BNA" (read/write)

-> "CSV" (read/write)

-> "GML" (read/write)

-> "GPX" (read/write)

-> "KML" (read/write)

-> "GeoJSON" (read/write)

-> "Interlis 1" (read/write)

-> "Interlis 2" (read/write)

-> "GMT" (read/write)

-> "SQLite" (read/write)

-> "ODBC" (read/write)

-> "PostgreSQL" (read/write)

$ ogr2ogr -f <output_format> <output_file> <options> <input_file>

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