ConvertToXYZ
From MohidWiki
ConvertToXYZ is a small tool that extracts baseline three-dimensional data into XYZ points files. It is useful, for instance, to extract baseline data to create bathymetries (or topography in land projects).
Contents
Quick Start
- Map a network drive to the data file (ETOPO, GEBCO, NOAA etc...).
- Create and edit a ConvertToXYZ.dat file. Save it in the same path of the executable.
- Run the executable.
Options file
WARNING: Only use integer coordinate lat/lon numbers.
FILE_TYPE: is the parameter that defines the type of input data. It accepts values from 1 to 6 that indicates the following possible origins of data: 1 NASA SRTM (Shuttle Radar Topography Mission) 2 ETOPO 2 (every 2') 3 ETOPO 5 (every 5') 4 Shoreline (Mapgen) 5 GEBCO (every 30" or 1') 6 ASCII (ArcView.....) 7 NASA SRTM30 (every 30") INPUT_FILENAME: input data file, OUTPUT_FILENAME: where the results will be written, TOP, BOTTOM, LEFT, RIGHT: Latitude and longitude minimum and maximum values (integers only!) WRITE_AS_BATHYMETRY: indicates if equal to 1 that the output is written in bathymetry format WRITE_AS_POLYGONS: indicates that would produce outcoming files with polygons format *.xy when 1.
ETOPO2
Here's what the options ConvertToXYZ.dat file looks like:
<begin_window> FILE_TYPE : 2 INPUT_FILENAME : Z:\etopo2.dat OUTPUT_FILENAME : WestIberiaET2.xyz TOP : 46 BOTTOM : 33 LEFT : -14 RIGHT : -5 MAXIMUM : 1 MINIMUM : -9999 WRITE_AS_BATHYMETRY : 1 CONVERT_TO_HDF5 : 0 <end_window>
NOAA Shoreline/Coastline
The file ConvertToXYZ.dat to convert a coastline downloaded from the NOAA Marine Geology & Geophysics Shoreline/Coastline Data would look like that:
<begin_window> FILE_TYPE : 4 INPUT_FILENAME : Aysen-lowres.dat OUTPUT_FOLDER : C:\Aplica\Ecomanage\Data\NGDC_NOAA_shorelines\Software\ OUTPUT_NAME : Aysen-lowres WRITE_AS_POLYGONS : 1 MAX_BUFFER_SIZE : 250000 <end_window>
GEBCO
For GEBCO bathymetric downloaded data the file would look like:
<begin_window> FILE_TYPE : 5 INPUT_FILENAME : 60W30S_40W10S.cdf OUTPUT_FILENAME : 60W30S_40W10S.xyz MAXIMUM : 1 MINIMUM : -9999 WRITE_AS_BATHYMETRY : 1 CONVERT_TO_HDF5 : 0 <end_window>
ASCII Grid
Use this option if you have and ASCII grid. ASCII grids can be produced from raster datasets for example in ArcGIS ("Raster to ASCII").
<begin_window> FILE_TYPE : 6 INPUT_FILE : DTM.asc XYZ_OUTPUT_FILENAME : DTM.xyz <end_window>
SRTM30
Caution: make sure the ORIGIN_X and ORIGIN_Y correspond to the BOTTOM-LEFT origin of the srtm30 original source file! Here's a map of srtm30 tiles.
<begin_window> FILE_TYPE : 7 TOP : 46 BOTTOM : 33 LEFT : -14 RIGHT : -5 MAXIMUM : 1 MINIMUM : -9999 INPUT_FILE : \\kepler\DataCenter1\DataCenter\DadosBase\Oceanografia\Batimetria\SRTM30\Data\w020n40.Bathmetry.srtm XYZ_OUTPUT_FILENAME : WestIberiaSRTM.xyz ORIGIN_X : -20 ORIGIN_Y : -10 <end_window>
NASA Topography
1) If you have NASA binary files (.hgt):
For land topography look on \\kepler\DataCenter1\DataCenter\DadosBase\Terra\Topografia\NASA
In Eurasia folder you will find data for Europe. Copy the .zip files you need (or all) to your Hard Disk and unzip them.
Run the ConvertToXYZ with a structure adapted to your needs:
<begin_window> FILE_TYPE : 1 LEFT : -9.28 RIGHT : -9.056 TOP : 38.99 BOTTOM : 38.75 INPUT_FOLDER : D:\Dados\NASA\ XYZ_OUTPUT_FILENAME : D:\Aplica\Trancao\Trancao.xyz SAMPLE_POINTS : 1 CONVERT_TO_UTM : 1 <end_window>
2) If you have NASA grids (e.g. SRTM from site):
Convert DEM grid to ascii (e.g. using ArcGIS "Raster to ASCII")
Convert ascii to .xyz using this tool (see example above).
