Brunton Multi-Navigator Spezifikationen PDF herunterladen (Seite 244)

The USA DEM 24K files are usually provided in the

SDTS

file format. OziExplorer

does not read files in the

SDTS

format, these files can be converted to DEM using

the sdts2dem.exe program provided with OziExplorer3D. The sdts2dem program

was written by Sol Katz. A program called oziUnGzip.exe has been provided with

OziExplorer3D which can uncompress the dem files and convert them automatically.

Height Data in XYZ format will not be supported as individual heights cannot be

quickly read from files in this format.

USA DEM 250 USGS

second

dem

1:250,000

scale dem

approx 100

meter

A file called

default.ozproj

can be setup in

each folder to

specify the

Datum

USA DEM 24K

USGS

7.5

minute

dem

1:24,000

scale dem

mostly 30

meter but some

at 10 meter

Data must be in

UTM or Lat/Lon,

if no datum is

specified in the

file header a

default datum of

NAD27 CONUS.

A file called

default.ozproj

can be setup in

each folder to

specify the

Datum

Using Height Data Files by Specifying the Grid and Datum

Many countries supply Height data files (DEMs) which are projected in their own local grid and

datum.

For many types of DEM formats it is not possible to store this information in the DEM file so it

must be specified externally.

To do this OziExplorer uses a file called default.ozproj (a Projection file) which stores the Grid, the

grid zone (if applicable) and the datum of the data in the DEM files in the folder.

This is an example of a default ozi projection file for using DEM's in other grids and datums.

Download example file here

default_ozproj.zip

The use of a default.ozproj file is optional

If a default.ozproj is not found, the DEM is assumed to be using the default grid and datum

for the type of DEM

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