Overview of Geo-tagging
Features and Guidelines for
Standard and Accelerated CEAC
OUTLINE
I.
II.
III.
IV.
V.
VI.
Basics of Geo-tagging
Main Features
Framework
What are the benefits
Framework in Accelerated CEAC
Constraints and Strategies
I. Basics of geo-tagging
What is geo-tagging?
Is geo-tagging similar with GPS?
What is the difference between GPS and A-GPS in
smart phones and tablets?
What are the common sources of errors?
What is Geo-tagging?
GPS-enabled devices such as smart
phone, PC tablet and camera that are
capable to receive satellite signals to
determine actual location.
Geo-tagging is also
GPS capturing!
GPS (Global Positioning System)
• Used in land surveying, aviation, military, etc. to determine
exact location
• About 30 active satellites orbit
the earth and transmit signals
to a GPS receiver
Satellites
Control Facilities
User
GPS Receiver
GPS (Global Positioning System)
• GPS receivers are built into mobile devices with different degrees
of signal sensitivity.
• These devices also use radio
signals from satellites to get
location information.
Satellites
Control Facilities
User
PC Tablet with inbuilt
GPS receiver = GeoGPS Receiver
tagging
Device
A-GPS (Assisted GPS)
• Geo-tagging devices can use additional network resources in time
of inadequate signal condition.
• A-GPS
 Wifi
 Data connection
Satellites
Network Facilities
i.e. Cell sites, A-GPS
Servers
User
PC Tablet with inbuilt
GPS receiver = Geotagging Device
Sources of Errors
1. Adequate number of fix satellites
• Usual handheld receivers = minimum
no. of 4 fixed satellites
• Geo-tagging devices = more than 10
fixed satellites
Sources of Errors
2. Positioning of satellites
• Should be very well dispersed over the
space
• Error may be up to 100 meters if
satellites are not dispersed!
• Error of 5-6 m is acceptable
Sources of Errors
3. Reflected and blocked off signals
• If GPS receiver is used inside a vehicle or building, near high structure or
under a canopy, signals will be blocked off.
Satellites
Unreflected
Signals
Reflected
Signals
Blocked Off
Signals
User
Sources of Errors
4. Clock inaccuracies
• Time discrepancy between the
GPS receiver’s clock and satellite
clock can distort information
such as location, speed, time
and distance.
II. Main Features
GPS Status
Camera ICS
DMD Panorama
My Tracks
Geo-tagging Applications
Application installed in your smart phone/PC tablet:
GPS Status and Tools
by MobiWIA
Camera ICS+
My Tracks by Google
DMD Pano
Geo-tagging Applications
Mainly used to monitor the strength of
connection of GPS receiver to the satellites
GPS Status and Tools
by MobiWIA
Captures images and current location where
the photo is taken
Camera ICS+
Geo-tagging Applications
Records route or path, elevation, and speed
My Tracks by Google
Used in capturing 180° or 360° images
DMD Pano
III. Framework
General geo-tagging workflow
Sub-project Categories
Protocols for Geo-tagging
Tasking and coordination
Frequency
General Geo-tagging Workflow
Foot Survey/Data Collection
INTERNET
(CLOUD)
Share data
to public
Image and GPS
captured by PC Tablet
Copy, organize &
upload data
Using desktop/laptop
Categories of Sub-projects
1) Point Structures - day care center, multi-use building, public
market, school building, etc.
2) Linear Features - farm-to-market road, drainage, flood control,
road concreting, etc.
3) Non-Permanent Items - boat construction, community
transport, etc.
4) Feasibility Studies
5) NCDDP Activities - barangay assembly, capacity building, etc.
Representations of community subprojects and other geo-tagged data
on a map
1. Points- address locations, GPS coordinates, locations of
small features such as buildings, houses, electric poles,
mountain peaks, etc.
Barangay Ambolong, Batan, Aklan
2. Lines- street, streams, contours
and boundaries. Lines are usually used to depict features
that have length but no area.
3. Polygons- features that are
enclosed such as regions, provinces, municipalities,
barangays, parcels, and land use zones. Basically, polygons
are any features on the earth that has area.
Points
Lines
Polygons
Protocol before the actual collection of geo-tagged data
 Before going to the assigned municipality, remember to activate all
applications needed in collecting geo-tagged data:
 GPS functionality in Location and Security
 GPS Status
 Camera ICS or Default Camera
 My Tracks
 DMD Pano
Protocol for Point Structures
a)
b)
c)
d)
e)
f)
g)
Take single shot/geo-tagged photo of SP billboard.
Take single shot/geo-tagged photos of the front, two sides and back of the SP.
For structures with flag poles, get waypoint right in front of the flag pole.
Get waypoint in front of the entrance door.
Take 360° shot inside of the structure.
Take 360° shot from the front of the structure.
Label and add observations before leaving the area.
Protocol for Linear Features
Examples : Roads and other corridors, Electrification & Water
System
a)
b)
c)
d)
Set the elevation and speed interval on the tablet.
Take geo-tagged photo of subproject billboard.
Record track from start to the end of the road.
Take single shot/geo-tagged photo, record waypoint and take 360˚ shot at
three sections of the corridor depending on the length of the road—Beginning,
Middle and End.
Protocol for Linear Features
e)
f)
g)
Record waypoint and capture geo-tagged photo of other structures/POIs along
the corridor (critical points, location of RCBC, RCPC, PCCP, slope protection,
etc.).
Remember to label the captured single shot images, 360˚ shots, waypoints and
tracks before leaving the area.
Surveyor can also add observations and/or brief description on the status of
SPs.
Tasking and Coordination
Regional M&E 2 and 3 personnel shall focus on geo-tagging and
post-processing of completed SPs (of all fund sources)
ACT/MCT shall conduct geo-tagging of the proposed sites, the
updated accomplishment of SPs during their ocular inspections,
and all NCDDP activities (not applicable in accelerated CEAC). Postprocessed file will be submitted to SRPMT for quality checking.
Frequency of survey
 Regional M&E 2 and 3 personnel shall collect geo-tagged data
whenever he/she has an arranged monitoring visit or scheduled
TA in the project area.
 ACT/MCT shall conduct geo-tagging activities during the
subproject implementation:
 RFR 1st tranche
 RFR 2nd tranche
Frequency of survey
 During the first tranche, majority of the geo-tagged photos will
include unoccupied lots.
 Geo-tagged photos for the 2nd and 3rd tranches shall indicate the
physical accomplishment based on the table below.
1st Tranche
50%
51% to 60%
61% to 70%
71% to 80%
Required Physical Progress for 2nd Tranche
30% in place
40% in place
50% in place
60% in place
*Required physical progress for the 3rd tranche is 90%.
Frequency of survey
 It is important for the field surveyors to capture the same angle
of geo-tagged photo for the 3 tranches to accurately observe and
monitor the progress of SPs.
 To ensure that SPs are 100% completed and functional, geotagging will be performed during its inauguration.
 SP will also be geo-tagged every 6 months thereafter or every
conduct of SET.
 Minimum of 4 photos should be captured in every visit (front, 2
sides, back)
Sample:
st
1
Tranche
Sample:
nd
rd
2 /3
Tranche
Sample: Inauguration
Sample: Inauguration
2
Take single shots of
the front, side and
back of the SP
5
Take 360 shot
inside
4
Get waypoint in
front of the
entrance door
3
1
Take single
shot of SP
billboard
Get waypoint in
front of the flag
pole
7
Label and add observations
before leaving the area
6
Take 360 shot
from the front
Thank You !!!