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Download parameters are a useful way to limit the feature service data that are downloaded to MobileMap. This can be helpful on large projects where downloading all data (spatial and tabular features) in all layers may cause a performance problem, produce a cluttered map, or simply result in the download of unnecessary or irrelevant data downloads.It
The maximum number of features that can be successfully downloaded and used within MobileMap varies widely by device performance, Wi-Fi speed and the size and complexity of the data being downloaded. For example, polygons can have generalized geometries with a dozen or less vertices or may be very dense with hundreds (or more) vertices. The number of features and vertices (for lines and polygons) will impact both the download time and the performance when loading and displaying features on a map. For non-spatial features (e.g., Trees, Logs), users have generally found that downloading 5,000 to 10,000 features is a good upper limit. When more features are downloaded at one time, especially over slow Wi-Fi connections, the download can timeout and result in an incomplete download. Download parameters, combined with carefully constructed data models and inherited fields settings can help to ensure that appropriately sized data subsets.
Use of download parameters can also be helpful when you want to restrict data download to only the data that is relevant to specific users. An example of this is when an auditor needs to download all the data that was collected by a particular cruiser, but does not want to download any data from other cruisers. Another example is where a team wants to download all of the data for a particular project (or client, region, cover type, etc.) rather than all of the data in the feature service.
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