OSM Servers

Manifold's OSM Server dataport connects to OpenStreetMap web servers that provide vector data via OSM protocols.  The layers brought in from OSM Server data sources are drawingswith attribute tables, not images with tile tables.    They provide layers with points, lines, and area objects.  They do not provide images or image tiles.   

 

We can bring data from OSM servers into Manifold using two, related techniques:

 

 

 

It is unrealistic to attempt to copy the drawing and table from within the OSM data source, because that would be an attempt to copy all of the vector data, worldwide, from OSM's servers.  Instead, we must pan and zoom into a region of interest and select only the objects of interest within that region.

 

Connecting to a OSM server:

 

  1. Choose File - Create - New Data Source in the main menu, or right-click in the Project pane and choose New Data Source.

  2. In the dropdown menu choose More... to launch the New Data Source dialog.

  3. Choose Web Server: osm in the Type box.

  4. Enter the URL for the OSM data in the Source box.

  5. Default settings for other options will usually work for most OSM data.   Press Create Data Source.

  6. A new data source appears in the project.  Open it to see the drawing and table that is linked in from the OSM server.

 

Drawings and tables that are linked from OSM servers are neither selectable nor editable.

 

Creating a local copy of OSM data within a limited region:

 

  1. Create a map, and pan and zoom into a limited area of interest.

  2. Drag and drop the OSM drawing from the data source into the map.

  3. Select desired objects in the OSM layer.

  4. Choose Edit - Copy or press Ctrl-C to copy the objects.

  5. Click anywhere in the main, Manifold .map part of the project outside of the OSM data source's hierarchy.

  6. Choose Edit - Paste or press Ctrl-V to paste the objects into a new table.

  7. Create a new drawing from the table.

  8. Use the Schema dialog to add a key field and index to the table to make the drawing and table selectable and fully read/write.

 

A local table and drawing with objects that have been copied and pasted from an OSM layer are fully capable, native Manifold components.   

 

We can easily add a key field and index to the table to enable editing and selection in both the table and the table's drawing, using the procedure given in the Add an Index to a Table topic:

 

Adding an index to a table:

 

  1. Double-click on the table to open it.

  2. Choose Edit - Schema.

  3. In the Schema dialog click the Add Identity button.

  4. Press the Save Changes button.

 

New Data Source Dialog and Controls

In the main menu, choose File - Create - New Data Source.   The dropdown menu provides a list of favorites to choose from as well as a More... option.  

 

 

Choose More... to launch the New Data Source dialog.   Choose Web Server: osm in the Type box.

 

 

Name

Name for the new data source, "Data Source" by default.  Specify a more memorable name as desired.  If we forget the origin of a data source we can hover the mouse over the data source name in the Project pane and a tool tip will provide connection information.

Type

Choose Web Server: osm in the Type box to connect to a OSM server over the web. The same dataport is used to connect to both raster and vector data served by OSM servers.

Source

A connection string to the web server OSM data. The default is a URL that connects to the main OpenStreetMap server for vector data.  This may be a simple URL, or a very lengthy, complex  URL/connection string that embeds parameters such as keys that grant access or other parameters.  The connection string can also be entered using the Web Login dialog launched by the [...] browse button.

 Browse button

Click to launch the Web Login dialog, to allow use of a login and password plus use of a proxy server if desired.   The Web Login dialog is also handy for providing a Test button that can be used to test the connection.

Open as read-only

Open the data source read-only.  Has no effect with OSM servers since they are read-only in any event.

Cache data

Cache data downloaded from the server while the project is open.  Provides better interactive performance and greater flexibility with read-only data sources.

Save cached data between sessions

Save the cached data for the next time this project is opened, within the .map project itself in a Cache sub-folder in the System Data hierarchy.   Caution: checking this box can result in very large .map files when the results of browsing very large data from web servers are all saved.  However, having such data cached in the .map is handy for offline browsing of the project.

Create Data Source

Create the new data source in the project pane and close the dialog.

Edit Query

Launch the Command Window loaded with a query that creates the data source using the given settings.  A great way to learn how to use SQL to create data sources.

Cancel

 Exit the dialog without doing anything.

 

 

 Pressing the browse button next to the Source box launches the Web Login dialog, to specify a server and connection characteristics.

 

 

Server

The connection string for the server.  This may be a simple URL, or a very lengthy, complex  URL/connection string that embeds parameters such as keys that grant access or other parameters

Use login and password

Check this box for servers that require logging in with a login name and a password, providing the required name and password in the Login and Password boxes.

Use proxy server

Check this box when connecting through a proxy server.   The Proxy, Login, and Password boxes allow specifying the connection string to the proxy server as well as the login name and password required to use the proxy server.

User agent

Identifies what application (Manifold) is asking for a connection.  Some web servers want to know what client software is connecting, for compatibility or for business reasons.  The default string optimizes compatibility (Mozilla is very generic) while also identifying Manifold Release 9 as the client.  Users can adjust the string as necessary to comply with any special server requirements.

API key

Provide a key that authorizes use of an API when connecting to a proprietary data source that requires such a key.

Application key

A secondary application key or authentication code for those servers, such as here.com (also known as wego.here.com) that may require it.

Timeout

Specify a time in milliseconds to wait for connecting to the specified server.  Use 0 for the default timeout, or specify whatever is the desired time to wait before giving up on the server.

Test

Press the Test button to try the connection using the specified parameters.   If successful, a Connection established information dialog will pop open.

 

Notes

Problems connecting - Check the Log Window to see what is going on behind the scenes if an attempted connection does not work.     The problem is usually a wrong connection string, failure to provide required credentials such as an key string that authorizes access, wrong choice of protocol (the server uses OSM and the user picks something else), an incredibly slow server, a server that is offline or a server that is wrongly configured and which is not correctly using the protocol it claims to use.  

 

Visit the Manifold community forum and talk out difficulties with other users.  Make sure to post full information on what you are doing, the connection URL you used, all details of how you tried to connect (including all settings in the data source dialog), what happened, and what the Log Window reported.    If other users cannot help you, spending a tech support incident will produce an authoritative analysis of the issue.

 

The very last thing to consider is the possibility that a bug in Manifold is causing the problem.  Bugs happen, of course, but leaping to the conclusion as a first step that a bug is the problem is almost always a mistake.

 

User-unfriendly server configurations - Correctly configured web servers may sometimes make user unfriendly configuration choices, for example, only starting to show data when the view is zoomed in to some specific area. That is a perfectly legal configuration, but it may catch users by surprise if they open a web served layer and it is blank, because they have not yet zoomed sufficiently far into a particular region.  If a web server layer is blank, add it to a map with a "known good" background layer, such as Bing Streets, and then zoom into the area of interest that is likely to be covered.  OSM data usually will not appear until we are zoomed very far into a data set, such as only a smaller portion of a city.

 

Must Have Internet - It seems obvious that to connect to a web server we must have a live, functioning Internet connection.  What might not be obvious is that sometimes we may have only a partial Internet connection, without realizing we do not have a full Internet connection.  A classic example is using a browser, such as Opera, which may ignore failed IPv6 DNS resolution but work OK using IPv4 DNS resolution.  Without IPv6 DNS resolution we can browse Internet using Opera but we might not be able to connect to Microsoft, Google, or some other web servers.   

 

Manifold's web server connections, just like the latest Google Chrome and Microsoft Edge browsers, require full IPv6 DNS resolution.   That normally happens automatically using whatever IPv6 DNS servers are assigned by our Internet service provider, but at times IPv4 DNS continues to work OK while the IPv6 DNS servers assigned by our ISP do not work.  If we are using Opera, and not Edge or some other browser that uses IPv6 DNS resolution, we might not notice that our ISP-provided IPv6 DNS resolution is not functioning.    We might only notice the problem when trying to use an image server or other web server within Manifold and it does not work.

 

If we cannot get a display from a web server, we can check the Manifold Log Window. If the log reports that a connection cannot be made, in Windows network dialogs for our Internet connection  we can try setting the IPv6 DNS servers to some "known good" DNS servers.   A good choice is using Google's public DNS service, using the following addresses for primary and backup DNS server addresses:

 

2001:4860:4860::8888
2001:4860:4860::8844

 

Collections of Web Servers - Check the Product Downloads page for pre-package project files in Release 9 / Viewer .map format that Manifold publishes which contain collections of dozens of popular web servers data sources.

 

See Also

Project Pane

 

Web Servers

 

File - Create - New Data Source

 

CSV Servers

 

Custom Servers

 

GeoJSON Servers

 

JSON Servers

 

TMS Servers

 

WFS Servers

 

WMS Servers

 

WMTS Servers

 

Example: Spectacular Images and Data from Web Servers - A must see topic providing a gallery of views illustrating how Manifold can use web servers such as image servers and other free resources to provide a seemingly endless selection of spectacular background maps, satellite images and GIS data with nearly zero effort.

 

Example: Vector Layers from an ArcGIS REST Feature Server - Visit an ESRI web site, copy a URL, and then use that URL to connect to an ArcGIS REST web server that shows petroleum fields in Kansas, getting the data as a vector drawing layer. Style the layer as if it were local.  ESRI refers to ArcGIS REST servers that provide vector data as feature servers.  

 

Example: Connect to a WFS Server for State Government Data - Gathering our courage, we connect to a WFS server that provides 1200 vector layers, run by the state of Massachusetts.   We open a layer showing airports and then scrape the vector data into our own local storage.  

 

Example: Connect to a WMS Server for National Map Layers - Visit the National Map services web page, copy a URL for a shaded relief layer from USGS, and then use Style to enhance that shaded relief data for combination with other layers and really spectacular effects.

 

Example: Connect to a Custom Server for Cadastral Data - We connect to a custom image server that provides cadastral information originally from the French national cartographic agency, IGN.  We create a map and use the Style pane to re-style the web served image on the fly into a more usable form.

 

Example: Connect to a Custom OpenRailwayMap Server - We connect to a custom server that provides an OpenRailwayMap view of railroads worldwide, showing railway, tram, and subway infrastructure based on OpenStreetMap data.  Our first try at creating a data source does not work.  After consulting the Log Window we try again with a slight adjustment and our second try works.

 

Example: Connect to an OSM Vector Server - We connect to an OSM Server that provides a vector layer containing points and lines in the OpenStreetMap database.  We then show how to scrape (copy) data from the OpenStreetMap server into local storage.  We extract building footprints from the local copy.

 

Example: Raster Layers from an ArcGIS REST Image Server - Visit an ESRI web site, copy a URL, and then use that URL to connect to an ArcGIS REST web server that provide a raster layer showing a mosaic of aerial photographs near Portland, Oregon.