![reading raster arcgis file into r reading raster arcgis file into r](https://www.esri.com/content/dam/esrisites/en-us/arcgis/products/r-bridge/assets/arcgis-rbridge-overview-bannner-fg.png)
![reading raster arcgis file into r reading raster arcgis file into r](http://132.72.155.230:3838/r/bookdown-r_files/figure-html/r-avg-and-borders-1.png)
The header file contains a set of entries, each of which describes a particular attribute of the image. You must generate a header file for each image, and it should have the same file name with a. The header file describes the image data. These ASCII text files can be generated in a text editor using the information you know about the image. There are three description files that can be provided with BIL, BIP, or BSQ files: a header file (.hdr) that describes the layout of the image pixel data and must be provided, a color file (.clr) that describes the image color map, and a statistics file (.stx) that describes image statistics for each band of the image. See an example of a BSQ file Image description files In other words, data for all the pixels for band 1 is stored first, then data for all pixels for band 2, and so on. For example, with the same three-band image, the data for bands 1, 2, and 3 are written for the first pixel in column 1 the data for bands 1, 2, and 3 are written for the first pixel in column 2 and so on.īand sequential format stores information for the image one band at a time. The following diagram illustrates BIL data for a three-band dataset:īand interleaved by pixel data is similar to BIL data, except that the data for each pixel is written band by band. For example, given a three-band image, all three bands of data are written for row 1, all three bands of data are written for row 2, and so on, until the total number of rows in the image is reached. It is assumed that your data is using unsigned integers, unless the keyword "pixeltype" is used and its value is"signedint".īand interleaved by line data stores pixel information band by band for each line, or row, of the image.