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Christine IksicPrecision Laser & Instrument
High Accuracy Data Collection with Esri Collector
• Part of Esri’s GIS Platform
• “…an online, collaborative web GIS that allows you to use, create, and share maps, scenes, apps, layers, and data.”
What is ArcGIS Online?
ArcGIS Online Components
• Give staff ‘anytime access’ to GIS data from any device
• Streamline data collection projects• Share project data with many users – not just GIS data• Simplify office > field > office workflows
Opportunities
Costs - Esri
http://www.esri.com/software/arcgis/arcgisonline/purchase
Mobile Applications
Collector Explorer
Navigator
Survey123 Workforce
• Create a location provider so that you can connect directly to professional-grade GPS receivers and stream highly accurate positions to Collector.
• Create a correction profile to accurately transform positions received from a differential correction source to the projection of your maps.
• Attach important positional metadata to the point features you collect and update using GPS.
• Get more information about your GPS position on the map.
• Receive notifications and alerts when accuracy conditions are not met or you lose connection to your provider. (*coming soon*)
• Windows 10 OS Support
Collector – What’s New
Versions and RequirementsAugust 23rd latest release – feature complete beta 3 update.Android 4.1 (Jelly Bean) or laterARMv7 or x86 processorOpenGL ES 2.0 supportPrecise location (GPS and network-based) supportJuly 19th – 10.4.0 releasediOS 8 or lateriPhone, iPad, iPod touch
August 17th – 10.4.0 releasedWindows 10.0.586 or later (tablet and PC; excluding LTSB)
To use a GPS receiver with Collector, it must support the output of NMEA 0183 sentences.
High-Accuracy GNSS Receivers
Trimble R1(Sub-Meter)
Trimble R2(Sub-meter, sub-foot, or centimeter)
Pairing GPS with iOS
GNSS Status app
• GGA: Global Positioning System Fix Data
• GSA: GNSS DOP and Active Satellites
• GSV: GNSS Satellites in View
• RMC: Recommended Minimum Specific GNSS Data
• VTG: Course over Ground and Ground Speed
• GST: GNSS Pseudorange Error Statistics
NMEA
High-Accuracy GNSS Receiver Support
• Most GPS or data collection apps have or still record GPS data in the WGS84 datum. Default in Collector is WGS84.
• This has been done so the GPS position matches the underlying base maps like Google Earth or Apple Maps
• This has meant that any existing data taken to the field must be moved into WGS84 before being edited in the field.
• When using differential correction, knowing the geodetic reference frame and epoch of the correction source is critical to creating accurate data.
• SBAS provides corrections referencing to ITRF or WGS84
• RTK or VRS may reference ITRF but more commonly reference a national grid like NAD83.
• Collector High Accuracy now supports on-the-fly datum transformations.
Datums & GPS
• DT1 Web Layers to Geodatabase Feature Layers• The web map has a coordinate system that is defined by the basemap that
you use. ArcGIS Online basemaps use the Web Mercator coordinate system and reference WGS84. You can use your own base maps which reference other coordinate systems.
• DT2 Web Map to Web Layer (Feature Service)• When Collector synchronizes edits it checks the coordinate system of the
feature service layer and the web map and if required will project GIS features into the coordinate system defined within the feature service. All feature service layers may not have the same coordinate system as it is not required but it is good practice to do so.
• DT3 Web Layers to Geodatabase Feature Layers• The feature service coordinate system is set by coordinate system of the
active data frame in ArcMap when it is published. This may be different than the coordinate system of the geodatabase.
Datum Transformations with Maps & Collector
Creating a Location Profile
Datum of Receivers Correction Service
(Ex. VRS NAD83 2011)
Datum Used by Map(Ex. WGS84 Mercator)
Zoom to Work Area Select Transformation
GPS Metadata Storage
Record Metadata• GPS metadata fields must first be
added to the feature service using python scripts or manually.
• Metadata fields are only populated on point fields.
• GPS metadata fields are overwritten if you update a feature.
• Model to add the metadata logging fields to a feature needed in the Collector app 10.4.0 build 1342 https://geonet.esri.com/docs/DOC-8374
• https://github.com/Esri/collector-tools/blob/master/CollectorUtils/add_gnss_metadata_fields.md
R2 -Metadata
In-app GPS Quality
Other New Data Collectors
Trimble TDC100(2-5Meter Android)
Trimble Kenai Tablet(2-5Meter Windows 10)
Questions?
