Add layers

After selecting the basemap, in the "Layer" tab, you can add layers according to your specific needs, such as: add from files, add from search, add from web, you can also create a mark layer, and then draw marks.

• Add From File
• Add From Search
• Add From Web
• Add Marker Layer

Add From File

You can add data to the map by uploading a file. Currently, it supports uploading of delimited text files (*.csv), Excel files (*.xlsx or *.xls), GeoJSON files (*.geojson, *.json), and Shapefile data compressed into zip packages. The uploaded files must be UTF-8 encoded, and the CSV format files also support GBK encoding.

You can add data files in the following three ways:

• Click "Add layer", select "Add from file", drag and drop the data file in the local disk to the current interface
• Click "Add layer", select "Add from file", click the "Upload file" button, and select the file to be uploaded from the local disk
• Click "Add layer", select "Add from file", click the "My data" button, and select the file to be uploaded from my data or data shared by others

After selecting a file, you can:

1. View file information. After selecting a file, the name and part of the attribute of the file will be listed for preview. The name of the file is the name of the added layer, and the layer name is not allowed to be repeated by default.

2. Choose a way to add data to the map. The default is to add data according to the Coordinates, you can also choose to add data according to Administrative divisions, Address (Need Address Matching service or Geocoding service), and Coding:
   • Add by "Coordinates": the coordinate system, longitude and latitude columns of the source file will be automatically recognized and selected, or you can manually specify the this information of the file.
   • Add by "Administrative division": Select the administrative division category (province or city) and field contained in the data file, and the data will be added to the map in the form of polygonal features. For example, you can use this method to make a map of the population of each province, or a map of the GDP growth of each city in a province.
   • Add by "Address": If the location information is expressed by the address in your data file, the city and address description can be parsed through the Address Matching Services (SuperMap iServer) or the Geocoding Service (SuperMap Online) to return the corresponding geographic coordinates and structured address description. Before using this method, the administrator needs to configure the Address matching service or Geocoding service for DataViz, see: Service settings. After the configuration is complete, the mapping user selects the corresponding city field and address field in the file, and click Add.
   • Add by "Coding": You can associate attributes in another table to the data file through 1-2 common fields. First, you need to select the associated fields (Field 1, Field 2) in the file to be uploaded. Then select the table to be associated, and the associated fields in the table corresponding to the file to be uploaded (Associated field 1, Associated field 2), and click Add.

3. Finally, click the "Add" button to upload the file and add to the map. Data items that do not meet the requirements will be automatically filtered out.

   Note: DataViz supports geographic coordinate conversion. If the coordinate system of the uploaded data file is inconsistent with the coordinate system of the target basemap, the coordinate system of the data will be automatically converted so that the data can be correctly displayed on the map. Currently, the file source projections that support dynamic projection include: EPSG Code: 4326, EPSG Code: 3857. For the introduction of EPSG Code, please refer to: EPSG Code supported by SuperMap.

Add From Search

You can add Map services and Data services available in the portal, including services that are uploaded and published in the portal, or registered. After adding the REST data service, you can thematic maps thematic maps.

In the "Add From Search" tab, a list of REST Map services and Data services in the portal will be displayed. You can check the services that need to be added in batches, or add them one by one.  Clicking on a service will display a list of datasets contained in the service. Click the service name in the "Select dataset" tab to preview it.

Add From Web

In the "Add From Web" tab, you need to select the service type and input the service address.

Support to add iServer REST Map services, Data services, Datflow services, OGC WMS and WMTS, online GeoJSON data:

• When accessing the iServer REST map service restricted by token, you need to check the "Token" option, and then enter the service address and token.
• WMTS access request methods include KVP (Key-Value Pair) and RESTful, the default is KVP. For the access method supported by WMTS service, please refer to: WMTS1.0.0.
• Support for modifying styles for layers whose sources are data services and data flow services.
• Use a proxy to access GeoJSON services with cross-origin access restrictions.

Example: Add SuperMap REST Data service

1. Select the "Add From Web" tab, select the type "SuperMap REST Data Service"

2. Enter a valid service url in the following format:
   • http://<server>:<port>/iserver/services/{data-provider}/rest/data/datasources/{DataSourceName}
   • http://<server>:<port>/iserver/services/{data-provider}/rest/data/datasources/{DataSourceName}/datasets/{DataSetName}

For example: https://iserver.supermap.io/iserver/services/data-world/rest/data/datasources/World/datasets/capital

After the data service is added, you can edit the style of the layer, please see: Modify layer style.

Add Marker Layer

Click the "Add Layer" tab and select "Add Marker Layer" to create a new mark layer.

Supports adding points, lines, surfaces, circles, ellipses, rectangles, hexagons, text, and Bezier curves. The specific adding process is as follows:

1. Select the type of marker layer you need to add, and move the mouse to the map to start drawing

2. After drawing, click the mark to edit in the edit pop-up window:

• For text mark, you can set the font size, color, and text layout

• For point, line, and polygon, you can add some information for each mark, such as title, description, picture, video link, web link, etc. You can also set the style of the mark. For details, see: Modify layer style.

After adding layers, you can modify the style of the layer, and proceed to the next step as needed. For details, see: Layer settings, Map settings, Controls usage, Attribute table query and editing, Output results.