MAPPING OF FOREST CLEARANCE IN ‘EUA, TONGA VEGETATION MAPPING.

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Presentation transcript:

MAPPING OF FOREST CLEARANCE IN ‘EUA, TONGA VEGETATION MAPPING

INTRODUCTION Brief History Current Practice Database Setup GIS Setup Image Interpretation

BACKGROUND HISTORY Training with LandCare on GIS Arc View LandCare mapped the clearings with High Precision GPS Mapped Forest according to Compartments

WHAT WERE THE PROBLEMS? No GPS equipments to digitally map the clearings and Forest Compartments after the LandCare left. No back up copies available

WHAT WAS USED? Tape Measure Suunto Compass Clinometer Field Book

WHAT RECORDED IN THE FIELD BOOK Stations / Points Distance Forward Bearings Backward Bearings

HOW THIS WAS CONVERTED DIGITALLY? Data from the field were entered into Spreadsheet, get the X and Y Coordinates of the starting point from the GIS ARCVIEW Map to calculate X and Y accumulation. POINT DISTANCEF/BEARINGB/BEARING X_CoY_CoX_AccumY_Accum

Highlight only X & Y Coordinates column and save as dbf file POINT DISTANCE (m)F/BEARINGB/BEARING X_CoY_Co X_AccumY_Accumu DATA PROCESSING

GIS ARCVIEW Open ARCVIEW File, Go to View and click on New Theme, Points The Points appear on the map, joint the points and convert to Shapefile

GIS/GPS TRAINING MapInfo Hand held Garmin

How the Hand held Garmin was used? Clearings inside the ‘Eua Forest Plantation were marked with GPS

Steps of Data Processing Data transfer from GPS to Computer Data is cleaned up, saved and then go to MapInfo professional and import file X_CoY_Cons:elePointName

Create Point by getting X and Y Coordinates, joint and edit

SATTLELLITE INTERPRETATION ‘Eua 2005 Image

DIGITIZED CLEARINGS Forest Clearings outside the ‘Eua Forest Plantation were also digitized but only on Woodland, Broadleaved and Conifer Forest Plantation

Difference between the interpretation and field check less clearing on the image More clearings on the ground

Reasons for differences between interpretation and field check Image that was used is ‘Eua 2005 Image Between 2005 and 2010 new clearings took place

Clearance 2010 ‘Eua:87 sqkm Clearance: Ha ( ‘Eua Forest Plantation: 714 Ha

THANK YOU! MALO ‘AUPITO