RTI File Format (RiverTools Information)
RiverTools Information (RTI) files are small, ASCII
"header" files that contain georeferencing and other
descriptive information for a DEM grid file that has the
same prefix. RTI files must conform to the following
rules, which are included at the bottom of every RTI file.
- RiverTools Information filenames must end with ".rti".
- The first line in the file should be: RiverTools Info File
- Any line that starts with a semi-colon is ignored.
- Colons are used to delimit labels from values.
- Values must be listed in a "standard" order.
- The number of rows and columns are required.
- Pixel geometry codes are: 0=Fixed-Angle (Geographic),
1=Fixed-Length (usually UTM).
- Pixel x-resolution and y-resolution are required.
- Measurement units must be METERS or DEGREES.
- Elevation data type is required. Allowed types are:
BYTE, INTEGER, LONG, FLOAT, and DOUBLE.
- Byte order is required and must be specified as either
LSB or MSB.
- (LSB = Least Significant Byte = little-endian)
- (MSB = Most Significant Byte = big-endian)
- For 'fixed-angle' pixels, bounding latitudes and longitudes
are required to compute lengths and areas correctly.
- Bounding box coordinates are always for the outer edges
of pixels as opposed to pixel centers.
- Latitudes south of equator and longitudes west of prime
meridian must be specified as negative numbers.
- RTI files are most easily edited with the File → View DEM
Info dialog in RiverTools but are simple text files that can
also be created and edited with any text editor.
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