testing of field- map/trupulse technology for measurement of forest parcels using jrc methodology...

Testing oftechnology for

measurement of forest parcels using JRC methodology

Field-Map User ConferenceKrkonoše 19.-21.9.2012

Why to measure an agricultural parcels?

“The CAP, since the 2003 reform, aims to provide for a stable farmer’s income, decoupled from production, within a framework of sustainable development of the rural areas while respecting environmental and other societal needs.

To distribute Community aid, the MS have to establish a Paying Agency to collect, control and reimburse all farmers’ applications through the IACS system with its geographical

module LPIS.”

CAP … EU Common Agricultural PolicyIACS … Integrated Administrational and Control SystemLPIS … Land Parcel Identification System

source http://marswiki.jrc.ec.europa.eu/wikicap/index.php/

How to measure an agricultural parcels?

“Article 34 of Commission Regulation (EC) No 1122/2009 requires that EU Member States use tools of a proven quality in order to measure agricultural parcels claimed for the Common Agricultural Policy area based subsidies. This requirement applies to the GNSS devices used by the Member States during their ON THE SPOT CONTROLS.”

“In order to evaluate the reliability and accuracy of area measurement with GNSS receivers and because the assessment of GNSS point accuracy is not sufficient, the JRC elaborated a validation protocol for the area measurements based on the ISO 5275 norm. Following this protocol, a BUFFER TOLERANCE is determinated in the framework of AREA MEASUREMENT VALIDATION SCHEME.”

JRC … EU Joint Research CentreGNSS … Global Navigation Satellite System (GPS, Glonass, Galileo)

source http://marswiki.jrc.ec.europa.eu/wikicap/index.php/

JRC area measurement validation scheme

Validation scheme step by step:

1. Design test site.

2. Mark the borders of polygons.

3. Get the reference areas/perimeters.

4. Schedule your measurements.

5. Collect data.

6. Statistical processing.

7. Derived the technical tolerance to be used.

8. Document all the process.

HARDWARE+SOFTWARE+SETTINGS+METHOD

source http://marswiki.jrc.ec.europa.eu/wikicap/index.php/

Why/How to measure a forest parcels?

Forest parcels eligible for area based CAP subsidies: first afforestation of non-agricultural land Natura 2000 payments forest-environment payments

While measuring the forest be ready for:- no or weaker GNSS signal (forest canopy, valleys and ravines)

- harsh measurement condition (obstacles, slope)

- visibility limitation (dense under-storey)

- no clear boundary identification+ lower expectations (buffer tolerance 3 m forest parcels x 1,5 m agricultural

parcels)

Field-Map/TruPulse technology

Hardware components: TruPulse 360B laser

rangefinder/inclinometer/compass

Field computer Accessories

(poles, reflectors, monopod, batteries etc.)

Software: Field-Map Data CollectorField-Map custom application – Area

Measurement

Field-Map/TruPulse validation

Design the test site (= establish a set of test polygons)!

Requirements:– Unambiguous borders (marking the boundary with wooden

sticks with a density of at least 1 peg per 25 m).– At least 5 test polygons of different size (appr. 0,2-4 ha) and

shapes (simple rectangular, prolongated, complex shape).

Radlík test site (6 test polygons):- square 0.36 ha

- long rectangular 0.69 ha

- complex-shape polygon 5.57 ha

- complex-shape polygon 2.40 ha

- complex-shape polygon 1.76 ha

- rectangular 1.52 ha

Field-Map/TruPulse validation

Mark the borders of polygons!

Field-Map/TruPulse validation

Total station Leica TRC 307

Get the reference areas and perimeters (RTK or surveying equipments)!

Field-Map/TruPulse validation

Schedule your measurements!Requirements:

– At least 8 series per polygon.– At least 4 repetitions per single series (changing clockwise

and anti-clockwise direction).– Several equipments units.– Revisit time for the GPS satellite constellation to be appr. 12

hours.

Field-Map/TruPulse test:- 9 series per each test polygon

- 4 repetitions per single series (2 CW and 2ACW)

- 3 teams and 3 sets of equipments

- revisit time N/A

Collect data! 6 polygons x 9 series x 4 repetitions = 216 measured polygons 3 teams (2 persons per team)

Field-Map/TruPulse validation

Statistical data processing!Requirements:

– Detect outliers (Grubb’s and Cochran tests).– Analyze impact of different factors (field, operator, set).– Check absence of bias (Student’s t-test).– Compute reproducibility standard deviation.– Compute reproducibility limit.– Derive technical tolerance to be used

i2n

measured reference

1 reference

1 [Area - Area ]R = 2.8*

n Perimeteri

Statistical data processing1. Pre-processing:• closing polygons using Bowditch transformation• calculating areas and perimeters using Polyshape

extension• EDA

- normality test (skewness&kurtosis, Shapiro-Wilk test)

- outliers/stragglers identification (Cochran, Grubbs tests)

- bias test (Student T test)

2. Buffer calculation- repeatability

- variance

- reproducibility variance

- reproducibility limit

3. Reporting

The mean reproducibility limit (buffer) of the measurement (95% confidence level) of all parcels, expressed as a buffer width, was found to be 0,34 m. In conclusion, following the result, it is suggested to use a 0,50 m buffer tolerance to be applied to measurements made with Field-Map Data Collector (v. 10) including TruPulse 360B rangefinder (firmware A3,07-b3,37) using vertex method. We recommend also to systematically locate one vertex per field using a GNSS device in order to correctly geo reference each measurement done.

Results are fully compliant with standard test http://marswiki.jrc.ec.europa.eu/wikicap/index.php/

EU Commission Joint Research Centre

Validation result

Field-Map/TruPulse technology:

1. belongs to the best category of equipments for area measurement.

2. has the comparable area measurement precision inside the forest as hi-tech GPS receivers outside the forest.

Conclusion

Thank you for your attention

IFER – Institute of Forest Ecosystem Research Ltd.Jílové u Prahy, Czech Republic

www.ifer.cz & www.field-map.com