Learn how to troubleshoot common issues with DataV widgets, including display errors, map borders, tile configuration, and basemap integration.
What do I do if a widget does not display correctly?
If a widget does not display correctly or appears incomplete, your login session may have expired. Clear your browser cache, especially cookies, and then log on again.
How do I draw borders for different regions on a map?
When you use a map widget, you can obtain GeoJSON data for geographical boundaries from the tool provided by Alibaba Cloud. Paste this data into the Area data field of the Choropleth Layer sub-widget in the Basic Plane Map widget. Then, based on the code for each area, edit the values for the heat map in Mapping Data. For more information, see DataV GeoAtlas Tool.
FAQ for map tile widgets
Common issues and solutions for DataV map tiles.
How do I call map tiles in a local area network?
In a local area network (LAN), cache online tiles on your web server. Store the tiles in folders that use a standard naming convention, such as [zoom_level]/[row_number]/[column_number].png. Then, access the tile service through a URL such as http://ip:port/path_to_your_tile_directory/{z}/{x}/{y}.png.
What are the coordinate system formats and service specifications for map tiles in DataV?
DataV supports map tiles in WGS84 or GCJ-02 spherical coordinates by default, segmented using the standard Web Mercator projection (SRID:3857). For tile services, Google Maps uses the standard Tile Map Service (TMS). For AMAP, access the service through a URL such as http://webrd03.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=8&x={x}&y={y}&z={z}. The {} placeholders are automatically replaced with the correct tile row and column numbers when the service is called.
How do I convert data from the WGS84 coordinate system if I use an AMAP basemap?
The AMAP basemap uses the GCJ-02 coordinate system. Therefore, you must transform your WGS84 vector data. For more information, see coordtransform.
How do I cache tiles?
DataV does not provide services or tools for caching tiles. You can use a map downloader or write code to cache tiles.
FAQ for basemap integration
Common issues and solutions for DataV basemap integration.
What is the TMS specification?
TMS stands for Tile Map Service, also known as Web Map Tile Service (WMTS). For more information, see the OGC website: https://www.ogc.org/standards/wmts/.
What map services does the basemap layer support, and is local deployment supported?
The basemap layer supports standard map services published under the TMS specification, such as the default AMAP vector and imagery services. Any service that follows the TMS specification can be deployed locally and integrated using the basemap layer.
Does the AMAP online basemap support offline access or local deployment?
No. The AMAP online basemap supports only online access to the default AMAP map templates and custom map services from the AMAP platform. Offline services and local deployment are not supported.
Does DataV provide offline tile packages?
No. DataV does not provide offline tile packages. Tiles are available only with an online connection.
Where can I get offline tile packages?
Contact AMAP or other map suppliers to inquire about pricing for offline map data and services.
What are the options for integrating a custom basemap that supports offline or local deployment?
Three main options are available:
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Professional solution: Follow the TMS specification and use software such as ArcGIS Server, SuperMap, or MapServer to create a custom basemap. Professional map companies typically provide this capability.
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Purchase custom basemap data from professional map vendors that have surveying and mapping qualifications and sell offline tile packages.
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Use MapBox to configure custom tiles. Custom tiles configured with MapBox support standard third-party integration. The basemap layer sub-widget within the Basic Plane Map widget supports integration with services that follow the TMS standard. For more information, see
What are the advantages of DataV over BI dashboards?
A business intelligence (BI) dashboard is a data visualization tool that displays business analytics metrics, Key Performance Indicators (KPIs), and other important data for an organization, department, or team on a single screen. Compared to BI dashboards, DataV has the following advantages.
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Scenarios: DataV supports multi-screen collaboration and large-scale screen splicing with resolutions of 8K and higher, making it suitable for exhibitions, real-time data monitoring, geographic data analytics, and multi-dimensional data displays.
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Display media: DataV projects can be displayed on large screens, TVs, computers, and mobile terminals.
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Visual effects: DataV provides beautiful and dynamic visual effects.
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Customization: DataV allows you to customize widgets as needed.
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Geographic data display: DataV has built-in 2D and 3D spatial engines that support displaying geographic information on 2D and 3D maps.
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Rich third-party widgets: DataV integrates various third-party widgets, such as ECharts and AntV. You can also find more commercial third-party widgets in the Alibaba Cloud Marketplace.