Qt Location Esri Plugin

概述

This geo services plugin allows applications to access Esri location based services using the Qt Location API. The use of these services is governed by the Esri terms of use .

Data is provided by many different content providers .

The Esri geoservices plugin can be loaded by using the plugin key "esri".

To use the services provided by the Esri platform, a subscription is required. There are two kinds of subscriptions:

The Developer subscription offers a free-of-charge option for developing and testing your applications. With this, your applications can go to production under the following conditions:

The app can request up to one million maps per month, and one million geocodes per month.
The app does not directly generate revenue. That is, end users must be able to obtain it and to use it for free.

If the above conditions cannot be met, the ArcGIS Online subscription is the correct choice, as it gives applications full access to the ArcGIS platform.

参数

Mandatory parameters

参数	描述
esri.token	Security token for using routing services only. Mapping and geocoding services do not require a token.

To use the routing services hosted on ArcGIS Online with the Esri plugin, a token is required. You can obtain a token for testing purposes , or you can sign up for an ArcGIS Online subscription .

可选参数

参数	描述
esri.useragent	User agent string sent when making network requests
esri.mapping.minimumZoomLevel	The minimum zoom level [double] at which the map is displayed
esri.mapping.maximumZoomLevel	The maximum level [double] at which the map is displayed
esri.mapping.cache.directory	Absolute path to map tile cache directory used as network disk cache. The default place for the cache is the `QtLocation/esri` subdirectory in the location returned by QStandardPaths::writableLocation (), called with QStandardPaths::GenericCacheLocation as a parameter. On systems that have no concept of a shared cache, the application-specific QStandardPaths::CacheLocation 被使用，取而代之。
esri.mapping.cache.disk.cost_strategy	The cost strategy to use to cache map tiles on disk. Valid values are bytesize and unitary 。使用 bytesize , the related size parameter ( esri.mapping.cache.disk.size ) will be interpreted as bytes. Using unitary , they will be interpreted as number of tiles. The default value for this parameter is bytesize .
esri.mapping.cache.disk.size	Disk cache size for map tiles. The default size of the cache is 50 MiB when bytesize is the cost strategy for this cache, or 1000 tiles, when unitary is the cost strategy.
esri.mapping.cache.memory.cost_strategy	The cost strategy to use to cache map tiles in memory. Valid values are bytesize and unitary 。使用 bytesize , the related size parameter ( esri.mapping.cache.memory.size ) will be interpreted as bytes. Using unitary , they will be interpreted as number of tiles. The default value for this parameter is bytesize .
esri.mapping.cache.memory.size	Memory cache size for map tiles. The default size of the cache is 3 MiB when bytesize is the cost strategy for this cache, or 100 tiles, when unitary is the cost strategy.
esri.mapping.cache.texture.cost_strategy	The cost strategy to use to cache decompressed map tiles in memory. Valid values are bytesize and unitary 。使用 bytesize , the related size parameter ( esri.mapping.cache.texture.size ) will be interpreted as bytes. Using unitary , they will be interpreted as number of tiles. The default value for this parameter is bytesize .
esri.mapping.cache.texture.size	Texture cache size for map tiles. The default size of the cache is 6 MiB when bytesize is the cost strategy for this cache, or 30 tiles, when unitary is the cost strategy. Note that the texture cache has a hard minimum size which depends on the size of the map viewport (it must contain enough data to display the tiles currently visible on the display). This value is the amount of cache to be used in addition to the bare minimum.
esri.mapping.prefetching_style	This parameter allows to provide a hint how tile prefetching is to be performed by the engine. The default value, `TwoNeighbourLayers` , makes the engine prefetch tiles for the layer above and the one below the current tile layer, providing ready tiles when zooming in or out from the current zoom level. `OneNeighbourLayer` only prefetches the one layer closest to the current zoom level. Finally, `NoPrefetching` allows to disable the prefetching, so only tiles that are visible will be fetched. Note that, depending on the active map type, this hint might be ignored.

Directions language

The service supports generating directions in the following languages:

语言	描述
ar	Generate directions in Arabic
cs	Generate directions in Czech
de	Generate directions in German
el	Generate directions in Greek
en	(default) Generate directions in English
es	Generate directions in Spanish
et	Generate directions in Estonian
fr	Generate directions in French
he	Generate directions in Hebrew
it	Generate directions in Italian
ja	Generate directions in Japanese
ko	Generate directions in Korean
lt	Generate directions in Lithuanian
lv	Generate directions in Latvian
nl	Generate directions in Dutch
pl	Generate directions in Polish
pt-BR	Generate directions in Brazilian Portuguese
pt-PT	Generate directions in Portuguese (Portugal)
ru	Generate directions in Russian
sv	Generate directions in Swedish
tr	Generate directions in Turkish
zh-CN	简体中文

If only unsupported language codes are specified via the locales property, the service returns the directions using the default language, English.

Directions length units

QLocale::MetricSystem (default) use meters, other values ( QLocale::ImperialUSSystem , QLocale::ImperialUSSystem ) use feet.