OSMDownloader - Open Street Map layers importations applications¶

Generate a vector data from OSM on the input image extend

Detailed description¶

Generate a vector data from Open Street Map data. A DEM could be use. By default, the entire layer is downloaded, an image can be use as support for the OSM data. The application can provide also available classes in layers . This application required an Internet access. Information about the OSM project : http://www.openstreetmap.fr/

Parameters¶

This section describes in details the parameters available for this application. Table [1] presents a summary of these parameters and the parameters keys to be used in command-line and programming languages. Application key is OSMDownloader .

[1]	Table: Parameters table for Open Street Map layers importations applications.

Parameter Key	Parameter Name	Parameter Type
out	Output vector data	Output vector data
support	Support image	Input image
key	OSM tag key	String
value	OSM tag value	String
elev	Elevation management	Group
elev.dem	DEM directory	Directory
elev.geoid	Geoid File	Input File name
elev.default	Default elevation	Float
printclasses	option to display available key/value classes	Boolean
inxml	Load otb application from xml file	XML input parameters file
outxml	Save otb application to xml file	XML output parameters file

Output vector data: Generated output vector data path.

Support image: Image used as support to estimate the models.

OSM tag key: OSM tag key to extract (highway, building...).

OSM tag value: OSM tag value to extract (motorway, footway...).

[Elevation management]: This group of parameters allows managing elevation values. Supported formats are SRTM, DTED or any geotiff. DownloadSRTMTiles application could be a useful tool to list/download tiles related to a product.

DEM directory: This parameter allows selecting a directory containing Digital Elevation Model files. Note that this directory should contain only DEM files. Unexpected behaviour might occurs if other images are found in this directory.
Geoid File: Use a geoid grid to get the height above the ellipsoid in case there is no DEM available, no coverage for some points or pixels with no_data in the DEM tiles. A version of the geoid can be found on the OTB website (http://hg.orfeo-toolbox.org/OTB-Data/raw-file/404aa6e4b3e0/Input/DEM/egm96.grd).
Default elevation: This parameter allows setting the default height above ellipsoid when there is no DEM available, no coverage for some points or pixels with no_data in the DEM tiles, and no geoid file has been set. This is also used by some application as an average elevation value.

option to display available key/value classes: Print the key/value classes available for the bounding box of the input image ** If not used : Note that the options OSMKey (-key) and Output (-out) become mandatory.

Load otb application from xml file: Load otb application from xml file.

Save otb application to xml file: Save otb application to xml file.

Example¶

To run this example in command-line, use the following:

otbcli_OSMDownloader -support qb_RoadExtract.tif -key highway -out apTvUtOSMDownloader.shp

To run this example from Python, use the following code snippet:

#!/usr/bin/python

# Import the otb applications package
import otbApplication

# The following line creates an instance of the OSMDownloader application
OSMDownloader = otbApplication.Registry.CreateApplication("OSMDownloader")

# The following lines set all the application parameters:
OSMDownloader.SetParameterString("support", "qb_RoadExtract.tif")

OSMDownloader.SetParameterString("key", "highway")

OSMDownloader.SetParameterString("out", "apTvUtOSMDownloader.shp")

# The following line execute the application
OSMDownloader.ExecuteAndWriteOutput()

Limitations¶

None

Authors¶

This application has been written by OTB-Team.