Tuflow

12da to from GIS: Difference between revisions

Browse history interactively
← Older editNewer edit →
Content deleted Content added
VisualWikitext
Line 1:
= Introduction =
'''12da_to_from_GIS.exe''' converts .12da files from the 12D software [https://www.12d.com (www.12d.com)] to and from .mif and .shp files, the formats.12da file needs to be in ANSI encoding, not UTF.
The .12da file must be saved in ANSI encoding, not UTF.
 
When importing or exporting between 12D and GIS, specify the file to be translated:
 
* If the file has a .mif12da or .4da extension, the program converts it to a .12damif/.mid file. ▼
* If the file has a .mif extension the program converts it to a .12da file.
 
* Note, whenWhen converting from a .12da file to a .mif file without any options, 12da_to_from_mif12da_to_from_gis.exe automatically creates a .mif/.mid file suitable for use by Read GIS Z Line. This is useful for importing 3D breaklines (eg. of a road design) directly into TUFLOW. ▼
This process is useful for importing 3D breaklines, for example a road design, directly into TUFLOW.
 
Several useful options are described in the table below. Particularly noteworthy are the following options:
** Of particular note is the -xs: option to generategenerates a TUFLOW 1D cross-section database from a 12D DTM. <br>▼
** This approachmethod is far more preferable to extractingmanual cross-sections manuallysection extraction and ismore much betteraccurate than extracting cross-sections from a grid based DTM, (eg.for example Vertical Mapper or Spatial Analyst), asbecause it only extractssamples points where the DTM triangle sides intersect the cross-section line,. therebyThis keepinglimits the number of points in theeach cross- section profile to a minimum, and also improving theimproves accuracy of the profile. ▼
 
* -zln: useful when river bathymetry in the DTM is poor because aerial survey data are inaccurate where water or dense vegetation is present.<br>
This option allows a section to be carved through the DTM along the river based on a cross section survey.
 
* If importing/exporting to/from 12D and a GIS simply specify the file that you wish to have translated. If the file has a .12da (or a .4da) extension, the program converts it to a .mif/.mid file format.
▲* If the file has a .mif extension, the program converts it to a .12da file.
▲* Note, when converting from a .12da file to a .mif file without any options, 12da_to_from_mif automatically creates a .mif/.mid file suitable for use by Read GIS Z Line. This is useful for importing 3D breaklines (eg. of a road design) directly into TUFLOW.
* There are some very useful options as discussed in the table below.
▲** Of particular note is the -xs option to generate a TUFLOW 1D cross-section database from a 12D DTM.
▲** This approach is far more preferable to extracting cross-sections manually and is much better than extracting cross-sections from a grid based DTM (eg. Vertical Mapper or Spatial Analyst) as it only extracts points where the DTM triangle sides intersect the cross-section line, thereby keeping the number of points in the cross-section profile to a minimum, and also improving the accuracy of the profile.
** The zln option can also be very useful when the DTM river bathymetry is poor because the aerial survey is inaccurate where there is water or dense vegetation, and you need to carve a section through the DTM along the river based on a cross-section survey.
=Options (switches)=
'''TABLE 1: 12da_to_from_GIS Options (Switches)'''
Retrieved from "https://wiki.tuflow.com/12da_to_from_GIS"