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| GPS
and Mobile |
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Other
data that can be incorporated into a GIS is GPS (Global
Positioning System) data collected in the field. A GPS can
be used to collect location data about particular features
(e.g. road junctions or sea defences) that can then have
attribute data (descriptive data) attached to them. GPS
data were collected for the study areas in 2000 and 2001
using a Garmin eMap GPS (2000) and Omnistar DGPS (2001).
They were attached to a Comapq Aero 2160 running both ESRI's
ArcPAD 5.0.1 and 6.0 (Beta) software as well as Pocket
GIS provided by Positioning
Resources. The Husky FEX21 hand held computer was also
used.
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| GPS |
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Garmin
eMap
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Omnistar
DGPS
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| Mobile
Computing |
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The
mobile computers used during the data capture process were
all powered by versions of Windows CE and Pocket
PC from Microsoft. The latest version of this software
is PocketPC 2002. Screen shots are shown below:
Pocket
PC 2002
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| Data
Capture |
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Screen
shot from ESRI's ArcPad using vector map data for
field mapping and data collection
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Screen
shot from Pocket Systems' PocketGIS (supplied by Positioning
Resources) showing position data from the attched
GPS receiver
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| Using
the Compaq Aero 2160 with Garmin's eMap GPS receiver |
The
GPS is connected to the palm top PC using a null modem
lead |
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The
Compaq Aero 2160 has:
256 colours high resolution TFT display (upgradeable
to 64K)
70 MHz MIPS-based RISC CPU
24 MB Memory RAM
Serial Port (115 KB per second)
Standard Type II CompactFlash Card Slot
Infrared Port (IrDA standard, 115KB per second)
Specifiactions for running ArcPad:
The following CPU chips - Hitachi SH3 and SH4, StrongARM,
MIPS
Windows CE 2.11 with Microsoft ActiveSync 3.0 (will
also run on Windows 95/98, NT and 2000)
4 MB memory, 75 MHz monochrome display palm-sized PC
Windows CE
Typical system: 24 MB memory, 133 MHz processor,
colour display and memory card for extra map data
Specifications for running PocketGIS
Microsoft Windows CE version 2.0 or later
Between 500k and 1Mb of stiorage memory to install
1.5Mb to 2Mb of system memory to run PocketGIS
4Mb plus of RAM + storage memory for data |
| Testing
the GPS and Compaq using ArcPad 5.0.1 (Ythan Estuary,
c. 12 miles North of Aberdeen) |
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