1 open source geo-spatial tools and mobile device for ... · project : canal network digitization...
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Open Source Geo-Spatial Tools and Mobile
Device for Canal Network Digitization
Paavan Kumar Reddy Gollapalli
Young Professional, ICID(WG-SDTA)
Agricultural Engineer, AMIE
PGD in RS & GIS (ISRO)
Introduction
Now a days capturing of coordinates is possible with all devices which are
connected to satellites
Purchasing of GPS device especially for single work is not viable at all times
because of economic constraints
With the use of mobile devices canal network digitization is possible and
also the wealth condition of the structures and encroachments
identification is done through location where it is happened.
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Overview of Presentation3
▪ Case Study 1: Guntur Channel Medium Irrigation Project Canal Network
Digitization using Mobile Device and GPS: Water Use Efficiency Studies
Experiences (WALAMTARI, Hyderabad)
▪ Case Study 2: Bhupathipalem Medium Irrigation Project : Canal Network
Digitization Studies Using UN-ASIGN application (Water Resource Dept., Andhra
Pradesh)
▪ Accuracy of the work
▪ Adaptability at Field Level
▪ Conclusions
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Case Study 1: Guntur Channel Medium Irrigation
Project Canal Network Digitization using Mobile
Device and GPS: Water Use Efficiency Studies
Experiences (WALAMTARI, Hyderabad)
Authors
G. Paavan Kumar Reddy, [email protected]
Anita Yadav, DEE, WALAMTARI, Hyderabad, [email protected]
K. Yella Reddy, Vice President (ICID), Ex Director (A&R), WALAMTARI, Hyderabad, [email protected]
L Narayan Reddy, NIT, Warangal & Ex Director General, WALAMTARI, Hyderabad, [email protected]
Data used and MethodologyGPS device Mobile device
Garmin etrix 30 (4 No’s)
Lenovo K6
Samsung Tab (2 No’s)
Moto G4
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Ground truth data collection
Data Processing
using QGIS
(photo2kmz)
Canal Network Digitization
(Add Path)
Canal Network
Mapping of Canal
Network using QGIS
Collection of Ground Truth Data
Photo Credit : WALAMTARI, Hyderabad
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KMZ file opened in Google Earth
Digitized canal using the photos co-
ordinates on Google Earth
Photograph properties showing
Latitude & Longitude taken in
mobile
Length of Canals Surveyed
Content Length/Number
Total number of canals (Main canal, Distributaries, Minors,
Sub-minors and Filed Channels)52 No.
Total length of the canals 250 Km
Length of canals surveyed by GPS device 130Km
Length of canals surveyed by mobile device 120 Km
No. of Structures captured as photographs 373
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Waypoints of GPS device (Blue colour) and KMZ file points of Mobile device (Yellow colour)
shown on Google Earth
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Canal network of the Guntur Channel digitized on Google Earth using GPS &
Mobile devices data
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Case Study 2: Bhupathipalem Medium Irrigation
Project : Canal Network Digitization Studies Using
UN-ASIGN (Water Resource Dept., Andhra Pradesh)
Authors
G. Paavan Kumar Reddy, Trainee, [email protected]
Gopala Krishna, Assistant Executive Engineer, Musurumilli Division, Water Resource Department, A.P
Subramanyeshwara Rao, Executive Engineer, Musurumilli Division, Water Resource Department, A.P
Other Assistant Executive Engineer, Musurumilli Division, Water Resource Department, A.P
Data used and Methodology13
Ground truth data collection
(Mobile App)
Data Storing in
UN-ASIGN website
Canal Network
Digitization
(Add Path)
Canal Network
Data Processing
(photo2kmz)
Mapping of Canal
Network using QGIS
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UN-ASIGN working
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Plate showing the full view of Structures captured in Bhupathipalem in
UN-ASIGN website
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Plate showing the view of one structure in Bhupathipalem
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Plate showing the editing view of attribute data of structure
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Plate showing the co-ordinates on the photographof structure
Length of Canals Surveyed
Content Length/Number
Total number of canals (Main canal, Distributaries, Minors,
Sub-minors)24 No.
Total length of the canals 180 Km
No. of Structures captured as photographs and stored in
UN-ASIGN crowd source
813 No.
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Accuracy of the work
Purpose of work has to be clarified
Mobile device is also giving nearer accuracy of GPS
device
The best example for this one is UN-SIGN mobile
application
Digitization of canals (Depends on person to person)
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Mobile device showing accuracy of 4 m
Courtesy: UN-ASIGN
Adaptability at Field Level
The average distance covered by each person /day is 8 – 9 km
Nowadays all the field level staff (Luskars/Work Inspectors) have smart phones and are well versed with its operation
Field staff are very well acquainted about their irrigation schemes
All the Officers of irrigation department are now equipped with minimum one
computer
Engineers (Assistant/Assistant Executive Engineers) have to
to improve their skills/knowledge on QGIS and Google Earth
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Conclusions
Advantages
No Investment is required from the time of collection of data till processing
of data
Processing of data can be done in open source GIS softwares (QGIS) and they are user friendly also
Ground truth data (photographs) can tell
the current situation of the canals
Efficient use of man power at field level and we will get precise work
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Conclusions
Limitations
Mobile takes time to get connected with location services for getting the co-ordinates for
photograph
Sometimes accuracy goes beyond 20m to some thousand meters at initial stage
Battery in the mobile device gets dead early because of continuous usage
Sometimes co-ordinates for the photographs are not created because of poor satellite
connection or obstructions like trees/forest
Attribute data collection
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Acknowledgments
For Case Study 1: The authors acknowledge the financial support received from the
National Water Mission, Govt. of India and the Water and Land Management Training
and Research Institute (WALMATARI), Hyderabad, Govt. of Telangana, India for giving
support to conduct survey at Guntur Channel Medium Irrigation Project.
For Case Study 2 : Executive Engineer, Bhupathipalem Medium Irrigation Project, Water
Resources Department, Govt. Of Andhra Pradesh for conducting the survey.
UN-Asign crowd-source photos mobile app
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Key References
N Bhaskar Rao, Guest Lecture Notes, WALAMTARI, Hyderabad.
Google Earth User Guide,
http://static.googleusercontent.com/media/earth.google.com/en//usergu
ide/v4/google_earth_user_guide.pdf
Guntur Channel Medium Irrigation Project Sub-Division, Water Resources
Department, Govt. of Andhra Pradesh, India.
Quantum Geographical Information System (QGIS) Version 2.18 User Guide,
http://docs.qgis.org/2.8/pdf/en/QGIS-2.8-UserGuide-en.pdf.
https://www.unitar.org/unosat/un-asign-crowd-source-photos-mobile-app
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