What elevation formats are supported by the ImageStation products?
Answer
Supported Elevation Data Formats Elevation data files provide the land surface information that is used in orthorectification to correct relief displacement. This data can consist of regularly spaced ground elevation grids, of triangulated networks of ground elevations, or of regularly or irregularly spaced ground elevations in ASCII format. ImageStation OrthoPro supports the following elevation data file formats:
SRTM (.HGT) • USGS SDTS (.DDF) • USGS DEM (.DEM) • NIMA DTED (.DT0, .DT1, .DT2) The USGS files and NIMA files contain coordinate system information and require no associated coordinate system files. For Intergraph files, you must either define the coordinate system manually or select an associated design file that contains the coordinate system information.
ISDQ:
Supported Surface Formats ISDQ loads and saves surfaces in several formats. The preferred format is the Intergraph DTM format. The DTM format: • Supports morphological features, such as break lines, boundaries, and contours. • Supports (limited) multiple outer boundaries (islands). • Is a TIN format (irregular/non-gridded) and is therefore more accurate than grid surface formats. • Is the most efficient for ortho production. TIN refers to Triangulated Irregular Network. Although the table below refers to many formats as "TIN" only the DTM format stores the triangles of the surface within the file. This makes it more efficient for use in other applications when compared to other TIN formats, such as ASCII files, because the file does not need to be triangulated in memory before being probed for elevations. This table outlines the capabilities of supported surface file formats: Supported Format Type Read Write Internal Georeferencing ADF Grid/Raster Yes No Yes ArcGRD Grid/Raster Yes No No ASCII TIN Yes Yes No BIL/FLT Grid/Raster Yes No No DEM/DDF Grid/Raster Yes Yes Yes DGN TIN Yes No Yes DTED Grid/Raster Yes Yes Yes DTM TIN Yes Yes No GeoTIFF (three channels, 24-bit integer, shaded relief) Grid/Raster No Yes Yes GeoTIFF (one channel 16-bit integer) Grid/Raster Yes No Yes GeoTIFF (one channel 32-bit float values) Grid/Raster Yes Yes Yes Hgt (SRTM) Grid/Raster Yes No Yes HPC (Hexagon Point Cloud) TIN No Yes No IMG Grid/Raster Yes No Yes Intergraph GRD Grid/Raster Yes Yes No ISPM (Photo files) TIN Yes No Yes LandXML TIN Yes Yes Yes LAS/LAZ TIN Yes No Yes QUE TIN Yes Yes No SCOP TIN Yes No No TTN TIN Yes No No Intergraph XYZ TIN Yes No No
Dgn2Dtm loads a DGN file and converts it to a TIN DTM format file.
If the DGN has an embedded coordinate system you can open the file with DefCsf.exe to review the coordinate system.
The mapping of the DGN layers to DTM features is defined using the filter parameter. The mapping may be defined using an .ini file from ISAE or ISDC.
Command Parameters
Parameter
Default Value
Description
input
Input DGN filename.
input-csf
(Optional) Input coordinate system filename.
output
Input filename with .dtm extension
Name of the output file. If no output filename is given, the extension of the input file is replaced with .dtm. If the output file exists (e.g. is the input file), it is overwritten silently.
output-csf
(Optional) Output coordinate system filename.
filter
Define the mapping of DGN levels, colors, etc., to DTM features. You can define more than one mapping. The command also accepts an ISAE or ISDC .ini file.
history
Creates a property with name <YYYY-MM-DD HH:MMS> and content <text>.
verbose
no
Flag to output additional information. Options: yes or no.
Example
--filter "INT level 30 color red weight 1 style 2"
--filter "BRK level 20 color green weight 1 style 2"
--filter "EXT level 40 color blue weight 2 style 3"
--filter "REG level 50 color -1 weight -1 style -1"
Import features based on level and symbology. "-1" indicates any occurrence of the indicated symbology or level type.
