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Overview of Geo-tagging Features and Guidelines for Standard and Accelerated CEAC. OUTLINE. 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?

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Presentation Transcript
  • Basics of Geo-tagging
  • Main Features
  • Framework
  • What are the benefits
  • Framework in Accelerated CEAC
  • Constraints and Strategies
i basics of geo tagging
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
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


GPS (Global Positioning System)

GPS Receiver

  • 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

Control Facilities


gps global positioning system1


GPS (Global Positioning System)

GPS Receiver

  • 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.

PC Tablet with inbuilt GPS receiver = Geo-tagging Device

Control Facilities


a gps assisted gps


A-GPS (Assisted GPS)

PC Tablet with inbuilt GPS receiver = Geo-tagging Device

  • Geo-tagging devices can use additional network resources in time of inadequate signal condition.

Network Facilities

i.e. Cell sites, A-GPS Servers


  • A-GPS
    • Wifi
    • Data connection
sources of errors
Sources of Errors
  • Adequate number of fix satellites
    • Usual handheld receivers = minimum no. of 4 fixed satellites
    • Geo-tagging devices = more than 10 fixed satellites
sources of errors1
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 errors2


Unreflected Signals

Sources of Errors


Reflected Signals

Blocked Off Signals

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.
sources of errors3
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
II. Main Features
  • GPS Status
  • Camera ICS
  • DMD Panorama
  • My Tracks
geo tagging applications
Geo-tagging Applications
  • Application installed inyour smart phone/PC tablet:

GPS Status and Tools

by MobiWIA

My Tracks by Google

Camera ICS+

DMD Pano

geo tagging applications1
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 applications2
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
III. Framework
  • General geo-tagging workflow
  • Sub-project Categories
  • Protocols for Geo-tagging
  • Tasking and coordination
  • Frequency
general geo tagging workflow
General Geo-tagging Workflow

Image and GPS

captured by PC Tablet

Foot Survey/Data Collection

Copy, organize &

upload data

Using desktop/laptop


Share data

to public

categories of sub projects
Categories of Sub-projects
  • Point Structures - day care center, multi-use building, public market, school building, etc.
  • Linear Features - farm-to-market road, drainage, flood control, road concreting, etc.
  • Non-Permanent Items - boat construction, community transport, etc.
  • Feasibility Studies
  • NCDDP Activities - barangay assembly, capacity building, etc.
representations of community subprojects and other geo tagged data on a map



Barangay Ambolong, Batan, Aklan


Representations of community subprojects and other geo-tagged data on a map
  • Points- address locations, GPS coordinates, locations of small features such as buildings, houses, electric poles, mountain peaks, etc.
  • 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.
protocol before the actual collection of geo tagged data
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
Protocol for Point Structures
  • 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
Protocol for Linear Features

Examples : Roads and other corridors, Electrification & Water System

  • 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

  • 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
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). Post-processed file will be submitted to SRPMT for quality checking.
frequency of survey
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 survey1
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.

*Required physical progress for the 3rd tranche is 90%.

frequency of survey2
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, geo-tagging 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 inauguration1
Sample: Inauguration


Take single shots of the front, side and back of the SP


Take 360 shot inside


Get waypoint in front of the entrance door


Get waypoint in front of the flag pole


Take single shot of SP billboard



Take 360 shot from the front

Label and add observations before leaving the area