diff --git a/devices/hololens/hololens-spaces.md b/devices/hololens/hololens-spaces.md index bb7c7c33ec..2136c48b53 100644 --- a/devices/hololens/hololens-spaces.md +++ b/devices/hololens/hololens-spaces.md @@ -12,33 +12,38 @@ ms.date: 10/31/2018 # How HoloLens stores data for spaces -In the Windows 10, version 1803 update for Microsoft HoloLens, the mapping data for [spaces](https://support.microsoft.com/help/13760/hololens-spaces-on-hololens) is stored in a local database. (Previously, spaces were correlated to a Wi-Fi network SSID and saved separately.) +In the Windows 10, version 1803 update for Microsoft HoloLens, the mapping data for [spaces](https://support.microsoft.com/help/13760/hololens-spaces-on-hololens) is stored in a local database. -The map database is stored securely, with access only available to the internal system. The database is never available to a user of the device, even when plugged into a PC or when using the File Explorer app. When BitLocker is enabled, the stored map data is also encrypted. +The map database is not exposed to a user of the device, even when plugged into a PC or when using the File Explorer app. When BitLocker is enabled, the stored map data is also encrypted with the entire volume. -Multiple map sections exist when holograms are placed in different locations without a connective path between the locations. Holograms that are anchored within the same map section are considered to be “nearby” in the current space. +Holograms that are anchored within the same map section are considered to be “nearby” in the current space. ## Frequently asked questions **How does Wi-Fi data get used by HoloLens and where is the data stored?** -As long as WiFi is enabled, map data will be correlated with a WiFi fingerprint, even when not connected to an actual WiFi network/router. This is because the MAC address and signal strength (i.e. WiFi fingerprint) of a router is available without connecting to it. Network identification (i.e. SSID, MAC address) is not sent to Microsoft, and all WiFi references are kept local on the HoloLens. +As long as WiFi is enabled, map data will be correlated with nearby Wi-Fi access points. There is no difference in behavior if the a network is connected or just nearby. Network characterists are not sent to Microsoft, and all WiFi references are kept local on the HoloLens. -Wi-Fi fingerprint data (MAC address and signal strength) is stored locally to help correlate hologram locations and map sections stored within HoloLens’ database of known spaces. It’s secured locally, inaccessible to users, and never sent to Microsoft via the cloud or via telemetry. +Wi-Fi characteristics are stored locally to help correlate hologram locations and map sections stored within HoloLens’ database of known spaces. It’s inaccessible to users, and not sent to Microsoft via the cloud or via telemetry. **Does HoloLens need to be connected to the internet?** -No, internet connectivity is not required. The MAC addresses of access points within reach can be obtained without being connected or authenticated. -This also means that if Wi-Fi is disabled, the space search can still happen; HoloLens will need to search more of the map data within the spaces database, and finding holograms can take slightly longer. +No, internet connectivity is not required. Observed Wi-Fi access points are obtained without being connected or authenticated. It does not change functionality if the access points are internet connected or intranet/local only. + + + -HoloLens will sense and remember spaces even when WiFi is disabled, by securely storing the sensor data when holograms are placed. Without the WiFi info, the space and holograms may be slightly slower to recognize at a later time, as the HoloLens needs to compare active scans to all hologram anchors and map sections stored on the device in order to locate the correct portion of the map. **Since HoloLens no longer requires you to select a space when Wi-Fi is disabled, how does it find the space automatically?** -HoloLens will visually compare the currently scanning data from the sensors to locally stored spaces in the entire spaces database. It will locate holograms faster if the Wi-Fi fingerprint reference (same MAC address and signal strength) can be found, to narrow down the number of spaces to compare. +If Wi-Fi is disabled, the space search can still happen; HoloLens will need to search more of the map data within the spaces database, and finding holograms can take longer. + +HoloLens will sense and remember spaces even when WiFi is disabled, by securely storing the sensor data when holograms are placed. Without the WiFi info, the space and holograms may be slower to recognize at a later time, as the HoloLens needs to compare active scans to all hologram anchors and map sections stored on the device in order to locate the correct portion of the map. + +HoloLens will visually compare the currently scanning data from the sensors to locally stored spaces in the entire spaces database. It will locate holograms faster if the Wi-Fi characteristics can be found, to narrow down the number of spaces to compare. **How can I remove map data and known spaces from the HoloLens?** @@ -47,9 +52,7 @@ There are two options for deleting map data in **Settings > System > Holograms** - Select **Remove nearby holograms** to delete nearby holograms, clearing the map data and anchored holograms for the current space. A new map section would be created and stored in the database for that location once Holograms are again placed in that same space. - Select **Remove all holograms** to delete all holograms, clearing all locally stored map data and anchored holograms. No holograms will be rediscovered and any holograms need to be newly placed to again store map sections in the database. -**Where is the database of map data stored and how can it be accessed or secured?** -The stored map data is located in the map database in the directory `u:\programdata\microsoft\spectrum\hup\head tracker`. The database is specially accessed by only the system components, with no user access via HoloLens or PC. When BitLocker is enabled, the database is encrypted as well. There is no way to access or download the entire set of map data from the spaces database.