Erdas Imagine 2013 Crack Torrent
Badomero Schoulund
I have 20 Erdas imagine images. I want to read each of those images into variable "x1", "x2",... "x20" respectively, as matrices or arrays so I can query in the images. I need to read each pixel value and then reassign them. Kindly Help..
The format we are calling ERDAS_IMG to distinguish from other uses of the .img file extension is a proprietary, partially documented format for multi-layer geo-referenced raster images developed originally for use with ERDAS IMAGINE software. This format is used widely for processing remote sensing data, since it provides a framework for integrating sensor data and imagery from many sources. This description covers all chronological versions of the format because the compilers of this resource have been unable to find documentation that clearly distinguishes between formats as produced by different versions of the software. Comments welcome. This format is one of the formats used for data delivery via the National Map as of early 2015, in particular for the National Elevation Dataset (NED).
Another key feature of the ERDAS_IMG format is that it is designed to store technical and georeferencing/geocoding metadata from the source data imported as layers. This supplies a record of provenance. See External File Format Header Object Types.
ERDAS IMAGINE software uses a tiled format to store raster layers. The tiled format allows raster layers to bedisplayed and resampled quickly. The default tile size used to be 64 pixels by 64 pixels, but now appears to be 512 pixels by 512 pixels. Within a tile, raster data uses the BSQ_enc ordering for pixels. Optionally, a large raster layer may be organized in a "pyramid" for faster processing. In pyramid layers, reduced, subsampled raster layers are created from the originalraster layer.
ERDAS_IMG is based on a Hierarchical File Format (HFA) structure. Many of the items that can be included are optional. In addition, because of the open nature of the HFA format, developers may create and add new types of items to the file. Raster layers may be compressed using a variant of Run Length Encoding known as Dynamic Range Run Length Encoding.
For images requiring more than 2 Gbytes of disk space (although some sources indicate that the limit is now 4 Gbytes), a two file dataset is required. The .img file contains the usual structure of headers and structural metadata but the actual image data is kept in a separate non-HFA file format, known as a Large Raster Spill File, with the extension .ige.
Various government agencies and projects distribute data in ERDAS_IMG format, including: the Multi-Resolution Land Characteristics (MRLC) consortium; the Coastal Change Analysis Program, and the National Elevation Dataset. Accompanying metadata sometimes mentions a particular version, presumed to refer to the version of ERDAS IMAGINE used to create the files. For example, the National Land Cover Database from MRLC, uses version 9.3.
Viewing the ERDAS_IMG multi-layered images requires specialized software. A free desktop viewer, ERDAS ER Viewer is available from Hexagon Geospatial. ERDAS_IMG files can be viewed in GeoViewer, freely downloadable from Extensis, formerly LizardTech. ERDAS_IMG files can be read and written by ArcGIS Desktop and other ESRI applications. See Supported raster dataset file formats from ArcGIS help. It is also supported by Safe Software's FME engine for format conversion.
As of January 2015, ERDAS IMAGINE software is distributed by Hexagon Geospatial, which is part of the Intergraph Corporation. Intergraph is in turn part of the Hexagon conglomerate, which acquired Intergraph in 2010.
The Landsat team recommend a workflow (Link via Internet Archive) using an ERDAS_IMG file as an intermediate file in order to fill in pixels that are missing in source images from Landsat 7. The final output of the workflow is a GeoTIFF image designed to be aesthetic rather than scientifically precise. Preparing Image Base Maps for the Digital AerialSketchmapping (DASM) System, from the U.S. Forestry Service, provides instructions for another map-making workflow. This workflow outputs the ERDAS_IMG file as well as files in JFIF_1_02 (JPEG File Interchange Format) and MrSID formats.
See Hexagon: Our History (Link via Internet Archive) for the complex chain of corporate acquisitions. The Internet Archive reveals a view of the complex branding context for ERDAS IMAGINE over the years. A website for ERDAS, www.erdas.com, was first captured by the Internet Archive in 1997. The company described itself as a "mapping software company specializing in Geographic Imaging solutions since 1978." The version of ERDAS IMAGINE was 8.3. The company description in August 2008 indicates that ERDAS was acquired by Leica Geosystems in 2001 and that Hexagon had acquired Leica Geosystems in 2005. ERDAS IMAGINE 2009 was version 9.3. By June 2012, www.erdas.com redirected to geospatial.intergraph.com. As of January 2015, the earlier URLs redirect to www.hexagongeospatial.com, a site first crawled by the Internet Archive in May 2014.
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