Index
Image Processing I	A-Z	Image Processing III Enhancement

Image Processing II
Import of data

Raw data (which may denote already preprocessed data you retreive from a provider of satellite data) are often organized in the so-called BIL-format (= Band Interleaved by Line), a common way to store multispectral data. Here's an example for a 4-bands data file:

110 115 138 215 ... line 1 of spectral band 1
72 85 97 105 ...... line 1 of spectral band 2
218 172 160 35 .... line 1 of spectral band 3
156 134 129 92 .... line 1 of spectral band 4
111 115 142 210 ... line 2 of spectral band 1
69 83 96 104 ...... line 2 of spectral band 2
.....

In real the digital numbers (a measure for the spectral reflectance) are stored in a long sequence. So you must feed the BILIDRIS-routine with some knowledge about the nature of your raw data to be imported. That should not be a problem, as these data are delivered together with a header file, which might be directly included in the BIL-data or could be shipped as separate text file.

Parameter IDENTIFIER DATE TIME CENTER_LAT CENTER_LON NW_LAT NW_LON NE_LAT NE_LON SW_LAT SW_LON SE_LAT SE_LON PROD_BANDS DEVICE TRANSMISSION MISSION STATION IMGFILE NCOLS NROWS NBANDS LAYOUT

Description Unique name of standard product Acquisition date, year/month/day Acquisition start time (UTC), hour/minute Scene Centre Latitude, degrees minutes Scene Centre Longitude, degrees minutes North-West Corner Latitude, degrees minutes North-West Corner Longitude, degrees minutes North-East Corner Latitude, degrees minutes North-East Corner Longitude, degrees minutes South-West Corner Latitude, degrees minutes South-West Corner Longitude, degrees minutes South-East Corner Latitude, degrees minutes South-East Corner Longitude, degrees minutes Image bands in the product (1-4 digits) Instrument device number Direct data dump or tape-recorder playback Resurs-O1 mission Ground station where data is received Name of the file with image data Number of columns in the image file Number of lines in the image file Number of bands in the image file Organisation of bands in the image file

Example SK950709N50E015 950709 0905 50 15 15 53 53 27 12 9 52 8 21 24 48 7 10 48 46 57 19 8 1234 SK1 DIRECT 3 Kiruna AL191021.bil 4000 3750 4 BIL

The latitude, longitude coordinates must be expressed as decimal degrees. The SW_LON / NW_LON form the MinX / MaxX, the SE_LAT / NW_LAT the MinY / MaxY reference points. Reference system is 'latlong', reference units are 'Degrees'.

Results of the BILIDRIS-routine are 4 images, each of them 15 MB in size, representing 4 different spectral bands.

Besides the BILIDRIS import IDRISI has yet some more tools to get satellite data in:

- the import/export utilities

BIPIDRIS to import Band Interleaved by Pixel files

ERDIDRIS to convert to and from ERDAS *.gis and *.lan files (also mention the Palette conversion PALIDRIS)

- a binary file viewer

DUMP (or here)

	Index
Image Processing I	A-Z	Image Processing III Enhancement