JMap Server can connect to ArcGIS Server and ArcGIS Online REST services to access WMTS-type raster data published by this type of service.

With this type of data source, it is possible to read ECW or JPG2000 image files or to connect to an ECWP server (ERDAS Image Web Server) to obtain images. It is not possible to configure both at the same time.

Raster data sources are used to access raster spatial data (images). See the following sections for information on the various types of raster data sources that are supported

JMap Server can use the OpenStreetMap map as a raster data source. No parameters need to be configured for this type of data source.

This type of spatial data source allows you to read a wide variety of raster data formats. GDAL (Geospatial Data Abstraction Library) is an open source library specializing in raster data conversion and processing.

There can be one or more source image files (mosaic of images). The images of the mosaic can overlap and there can be holes in the mosaic.

When the data source is updated, if the option is activated, a pyramid of lower resolution images is created by JMap Server and stored in the image cache. The image cache is then used for high performance production of images on the fly at specific resolutions. Depending on the initial image sizes and parameters, the image cache size can become voluminous. Typically, the total image cache is about the same size as the original images. Available disk space must be sufficient before updating this data source. It is possible that the data format selected will not require the creation of a pyramid. In this case, the parameter will be ignored.

Multiple Coordinate Reference Systems

JMap Server Lima introduces this new feature that allows to select multiple coordinate reference systems for a spatial data source (SDS) created from GDAL. This allows to prepare in advance several versions of the raster SDS in order to offer optimal performances when processing requests from different applications.

Once the SDS is created, the Reprojections section of its configuration interface allows to add (+), update () or delete () alternative projection systems to the original one. The table in the section shows the systems configured for the SDS.

When adding a projection system, the SDS is projected into the system and an image pyramid is created and stored in a single file.

When an application uses the SDS, the one projected with the appropriate projection system is used (the projection system must be specified in the parameters of the application's request to JMap Server). For example, JMap NG applications use the EPSG:3857 - WGS 84 / Pseudo-Mercator system, so the SDS projected in this system is used by JMap NG.

If the SDS is not projected in the appropriate system, it is reprojected on the fly which consumes JMap Server resources and compromises the application performance.

JMap Server can use a raster spatial data source that comes from another JMap Server instance. To enable this, you must start by configuring a connection towards the other JMap Server. Refer to JMap Server to JMap Server Connections for more information.

Web Map Service (WMS) is a standard proposed by the that defines how client applications must request maps from a WMS compatible server. The protocol used is HTTP and the maps returned are typically images in popular formats (PNG, GIF, JPEG, etc.). WMS servers publish their capabilities in an XML document that specifies the types of requests supported as well as the metadata (list of layers, supported projections, etc.).

By configuring WMS data sources, you allow JMap to connect to and query WMS compatible servers (versions 1.0 to 1.3). You can then create raster layers based on these WMS data sources inside projects.

Once you have obtained the capabilities, you can define the parameters for the other types of requests in the WMS protocol. JMap Admin automatically suggests default queries that usually work very well. They are generated from the GetCapabilities request. If you wish to modify these default requests, you must select the Override default request option and enter new requests. For each type of request, you can also activate HTTP authentication and provide sign-on parameters.

Web Map Tile Service (WMTS) is a standard offered by the Open Geospatial Consortium that determines how client applications perform queries to obtain map data in the form of predefined tiles from a data server.

By configuring WMTS data sources, you enable JMap to connect to and query WMTS-compatible servers (version 1.0.0). You can then create raster layers based on WMTS data sources within projects.