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Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia 8 -12 October 2007 Slide 1 UNSD Workshop Pieter van Jaarsveld An Overview to a professional.

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Presentation on theme: "Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia 8 -12 October 2007 Slide 1 UNSD Workshop Pieter van Jaarsveld An Overview to a professional."— Presentation transcript:

1 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 1 UNSD Workshop Pieter van Jaarsveld An Overview to a professional GPS/Mapping collection solution Mobile GIS Specialist

2 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 2 Survey Recreational GPS users? In-car navigation users? Capturing GPS data in the field for GIS use? Plan to in the next year?

3 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 3 Global Positioning System

4 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 4 Global Positioning System Where on earth am I ? Constellation of satellites Handheld devices Various Applications Accuracy What is GPS?

5 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 5 1 Correct for Atmosphere & Ionosphere Differential Corrections 4 3 Trilateration using speed of light Accurate clocks are required 2 Use ephemeris for satellites location 5 GPS in 5 Basic Steps

6 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 6

7 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 7 Control Segment Provides worldwide coverage and control 365/24/7 Master Control station Colorado Four support stations Hawaii Kwajalein Diego Garcia Ascension Island

8 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 8 Space Segment GPS satellite constellation 24 satellites Replenishment occurring Satellite design Lifetime 7.3 years 16 satellites over 9 years old

9 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 9 User Segment Equipment produced by Military and Private companies Receives signal and computes Position Time Velocity

10 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 10 How do we position ourselves? Simple Geometry Velocity times vs travel time Determine Radio Wave Time Travel Accurate timing Measure Distances Known orbit locations Trilateration Distances not angles

11 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 11 Sources of Positioning Error Ionosphere and Atmospheric delays Satelite and receiver Clock Error Multipathing Dilution of Precision Receiver Issues Selective Availability

12 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 12 Two receivers track the SAME signals and errors at the SAME time Derived corrections are then applied to the data during postprocessing – GPS Analyst contains tools for DC Does not correct multipath Base Data Collector Differential GPS

13 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 13 Red = Uncorrected GPS Green = GPS after differential correction Differential Correction

14 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 14 Selecting a GPS Recreational versus Professional GPS Accuracy Tens of meters versus sub meter GIS data integration Format conversion Attribute collection Customised forms, business rules

15 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 15 Data Collection Software

16 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 16 Data Collection Workflow (server to server)Server Desktop Mobile Desktop Server Enterprise Geodatabase Export to PGDB Check out Copy to device ArcPad Copy to Desktop Check In Post process Import to Enterprise Data validation

17 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 17 Check out and post processing is performed on a personal geodatabase NOT directly from enterprise. WHY? GPS detail not required in enterprise Topology not supported in GPS Analyst Carefully choose extents. WHY? Large extent limits the amount of data capture Current only personal geodatabase support, efforts to supporting file geodatabase underway. UC 2007 Tech Sessions 17 Data - things to remember

18 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 18 What is ArcPad? Part of ESRI overall mobile strategy A mobile GIS application for field mapping applications Designed for broad range of mobile systems Allows input from GPS receivers, rangefinders, digital cameras and other devices Provides a generic set of mobile GIS functionality Extensive customization capabilities Extends Geodatabase to the field through disconnected editing

19 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 19 What can you do with ArcPad? Use your existing data Add data from the Internet Move around your map Query your data Edit your data Measure distance, area, and bearings on your map Navigate with your GPS Customize ArcPad to streamline your workflow

20 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 20 ArcPad Benefits Streamlines the workflow Smart, task oriented solutions Increases productivity Reduces office work and data entry time Improves the accuracy of data Resulting in more accurate and current data for analysis and decision making

21 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 21 ArcPad Functionalities Improved performance Enhanced editing tools Snapping Undo offsets for points, lines, polygons repeated features segmented line features Camera and rangefinder support Improved symbology and labeling Support for Graphics layer for redlining or mark-up Import/export tools for ArcGIS Customization wizard for creating custom forms

22 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 22 ArcPad Functionalities Significant performance gains on startup time Pre-buffering input Affects Applets, Layers, Scripts etc. (i.e ALL XML and Scripts) Delayed loading of projection data Usability enhancement Datum conversion wizard Picture browsing capabilities on Windows Mobile 5 devices Additional language packs available Quality improvements About 80 bugs have been identified and fixed! Minor feature improvements Object model improvements (Picture chooser, File object, Inter-process methods)

23 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 23 Configuring the GPS Protocol = Trimble GPSCorrect or NMEA0183 Port = COM3: TSIP Serial Port (GeoExplorer) Port = COM7: TSIP Serial Port (JunoST) Port = COM2: TSIP Serial Port (Recon XC)

24 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 24 Streaming and Averaging Averaging number of incoming GPS position coordinates that ArcPad uses for calculating an average coordinate Streaming Position Interval = How frequently ArcPad uses incoming GPS coordinates Distance Interval = ArcPad uses incoming GPS coordinates only when greater than this distance from LAST coordinate used

25 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 25 GPS Preferences Quality Minimum and maximum values can be predefined Can be made compulsory to ensure data integrity Warning and Alerts Visual and Audio alerts Constantly warns the user if not complying to presets Will inform the user of GPS status Can be annoying Can be switched off

26 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 26 Editing using the GPS Firstly, make layer editable (one point, line, polygon, at a time) Then select feature type Then select GPS capture tool

27 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 27 UC 2007 Tech Sessions 27 DOP SV Geometry High = BAD Low = GOOD SNR Signal to Noise Ratio High = Accurate Low = Productive Elevation Mask Default 15 No. of Satellites Min of 4 SVs Ensuring data quality

28 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 28 ArcPad with other devices ArcPad can be used with: Digital Cameras WiFi enabled cameras BT enabled cameras Use Camera tool Photo Layer Custom Form Laser Rangefinders What is your accuracy needs? External GPS

29 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 29 Where are the Satellites? Your Body is an obstruction! Point Data Collection Position First and Attributes Second Polyline & Polygon Collection Streaming (less accurate but dynamic) Vertex Averaging (more accurate and static) UC 2007 Tech Sessions 29 Data Collection Techniques

30 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 30 Do you understand Sticky Keys? Have you used appropriate colours and line thicknesses? Is your device locked? Dont you pick on me! (Avoid clicking on the map) The art of using a stylus Slow down and smell the flowers! UC 2007 Tech Sessions 30 ArcPad Tips and Tricks

31 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 31 ArcPad Orientation Demonstration

32 Mobile GIS UNSD - Mapping and Sensus Workshop: Lusaka, Zambia October 2007 Slide 32 Thank you Mobile GIS Specialist (011)


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