Brunton Multi-Navigator Especificações descarregar pdf (Página 235)

SRTM

SRTM (Shuttle Radar Topography Mission), a joint project between the NIMA and

NASA to produce digital topographic data for 80% of the Earth's land surface (all

land areas between 60

north and 56

south latitude).

Most of the world has been released on a 3-

arc

second (approximately 90 meters)

grid, with the USA data being available on a 1

arc

second (approximately 30 meters)

grid.

Note: Also available for download is SRTM30 (approximately 1km grid) comprising

a combination of data from the Shuttle Radar Topography Mission, and the the U.S.

Geological Survey's GTOPO30 data set. It is formatted the same as the GTOPO30

convention so should be considered as GTOPO30 data (see below).

(OziExplorer version 3.95.3a or later is required to read SRTM data. A

new version can be downloaded from the OziExplorer webpage. Older

versions of OziExplorer will not detect SRTM data.)

Downloading

Note: OziExplorer version 3.95.4j or later has the ability to download SRTM

height data

for the region of map being viewed so manual downloading through the

FTP site shown below is not required. The SRTM Download option is on the

3D/Elevation Menu. (OziExplorer3D must be installed for this menu to be visible.)

FTP Download

SRTM data for some regions can be downloaded from here.

Note : The file names represent the bottom left corner of your map, check your map

to make sure you obtain the correct files. The naming convention of the files is

"N49W110.hgt", for example this file covers the region from 49-

50 deg North and

109

110 deg West. In the southern hemisphere, the file "S17E142.hgt" covers the

region 16-

17 deg South and 142

143 deg East.

If you have downloaded the data for your area but OziExplorer does not

display any heights , downloading the wrong files is the most likely cause,

double check that you have downloaded the correct data files.

The SRTM data has artifacts, this is particularly noticeable over water (lakes or

rivers) and where sharp changes in height occur.

Using the Data

The files have a .zip extension indicating they are a compressed file. A

program called

oziUnGzip.exe

is supplied with OziExplorer3D which can

uncompress these files.

Run the

oziUnGzip

program and select the file (or files) you want to extract,

they will be extracted to the same folder as the compressed file.

Note

You

must use version 1.1 of the oziUnGzip program (the version is in the program

caption

version 1.0 does not display a version number).

The file extracted will have the extension .hgt.

Important

Do not change

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