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Products from the MOAC’s Natural Resources and Assets Administration Project

1.  Digital Color Aerial Photo 1:25,000 scale



          They were taken by using an aerial metric camera (Zeiss RMK 15/23 (wide angle) with focal length of 152 mm. Aerial negative films (9” x 9”) were used to capture the scene at 3,800 meters above mean sea level (m asl). A GPS receiver was installed on the aircraft for recording the coordinates of the exposure points. One aerial photo covered 5.75 x 5.75 square kilometers (sq km) with 60% overlap between scenes and 30% side lap between flights. Negative films were scanned by using a photogrammetric scanner with 15 micron in resolution. 

Specification :      -Total number: 73,071 scenes in Geo-TIFF format
                              - 98% coverage of the whole country
                              - 850 MB/scene

Caution : For security reasons and licensing, water marks will be stamped on every scene
                when provided to customers. 

Note : Diapositive and bromide papers from MOAC’s Project are provided by the Royal
            Thai Survey Department (RTSD), Ministry of Defense.

2.  Digital Color Orthophoto Maps


          Orthophoto maps from MOAC’s Project are produced by using aerial photos at a scale of 1:25,000 that have passed the orthor ectification method. This process can adjust photo geometric distortion and relief displacement. Orthophoto maps show details of topography and they can measure coordinates, direction, distance and shape of the objects, the same as vector maps and topographic maps.
          The Mapping Project for the Natural Resources and Assets Administration of MOAC produces orthophoto maps, which cover the whole country except for the three southern provinces of Thailand (Yala, Pattani and Narathiwat), some parts of Songkla Province, the border area between Thailand and PDR Laos, and some areas that do not pass TOR’s standard. This project can provide for government sections and private sections following ministerial regulations of MOAC. 

Specification scale 1:4,000
          - Define map sheet numbers by following the Department of Land’s standard
          - Covered area 2 x 2 sq km/map sheet
          - Coordinate system: WGS1984 UTM Zone 47/48
          - Resolution 0.5 / 1.0 / 10 m
          - Horizontal accuracy: 1 m (slope < 35%) / 2 m (slope > 35%)

Specification scale 1:25,000:
          - Define map sheet numbers by following the Royal Thai Survey Department
             (RTSD)’s standard
          - Covered area 13.75 x 13.75 sq km/map sheet
          - Coordinate system: WGS1984 UTM Zone 47/48
          - Resolution 0.5 / 1.0 / 10 m 
          - Horizontal accuracy: 1 m (slope < 35%) / 2 m (slope > 35%)

Note:   Land Development Department provides orthophoto maps of only 1 m resolution.

3.  Digital Elevation Model (DEM)


          Digital Elevation Model (DEM) is produced by measuring spot heights that represent terrain, storing, processing and presenting a 3D model. DEM is the most important item to create orthophoto maps. It is used to adjust error from the height of the terrain
 (relief displacement). 

Specification
          - Define map sheet names following the Department of Land’s standard
          - Covered area: 2 x 2 sq km/map sheet
          - Coordinate system: WGS1984 UTM Zone 47/48
          - Rater format (img)
          - Resolution: 5 m (GSD)
          - Vertical accuracy: 2 m (slope < 35%) / 4 m (slope > 35%)

Note:    Land Development Department provides DEM to government sections only following ministerial  regulations of year 2012.  

4. Contour Lines

          Contour lines are the lines that represent the height of the terrain. They are formed by drawing through the points that have the same height. The positive contour lines mean those above the mean sea level, whereas minus contour lines mean those lower than the mean sea level.

Specifications
          - Define map sheet names following the Department of Land’s standard
          - Covered area: 2 x 2 sq km/map sheet
          - Coordinate system: WGS1984 UTM Zone 47/48
          - Vector format (Shape file)
          - Contour interval:2 meters (slope < 35%) / 5, 10 meters (slope > 35%)
          - Vertical accuracy: 2 meters (slope < 35%) / 4 meters (slope > 35%)

5.  Ground Control Points (GCP)


      Ground control points are created for expanding photo controls, using an
orthorectification process, and are also used as ground control points in ground surveying.

Specifications
          - Using reinforced concrete (0.5 x 0.5 x 1.0 cu m) 0.9 m beneath ground;
                stainless steel pins 6 cm in diameter 
          - To locate in government offices and places like temples, schools and health
                centers. Distances between ground control points are between 10-20 km, with a
                total number of 2,810 points.
          - GPS survey with static technique and connecting to RTSD horizontal and vertical
                control network.
          - Coordinate system: WGS1984 UTM Zone 47/48 and Indian 1975. Using EGM96
                model for adjusting mean sea level and ellipsoidal heights.
          - Using ΔX= -204.5 m, ΔY=-837.9 m, ΔZ = -294.8 m as parameters for
                transforming from WGS84 datum to Indian 1975 datum.
          - Horizontal and vertical accuracy less than 5 cm.

6. MOAC’s Assets maps (1:25,000 scale)

          MOAC’s Asset maps (1:25,000 scale) are created by collecting asset maps from every department within the Ministry of Agriculture and Cooperatives and put in orthophoto maps, with 1:25,000 scale as the background.  

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