試験地に植栽した苗木の正確な地理座標と苗木の遺伝的系統情報を簡易に得るため,安価な RTK-GNSS キット C94-M8P と QR コードラベルを用いたマッピング方法を考案・試行した。二つの試験地で GNSS 測位を行い,近隣の電子基準点データを用 いた後処理キネマティック解析と RTK-GNSS を組み合わせて,約 90 本の苗木の地理座標を反復測定した。反復測定間の標準 偏差は水平方向で平均 2.6~6.0 cm,鉛直方向で平均 3.6~12.5 cm となり,高い精度で測位できた。また,一方の試験地において, 2 周波 GNSS 受信機とトータルステーションを用いて推定した地理座標を真の地理座標の値として,C94-M8P を用いて推定し た地理座標との差を求めたところ,水平方向で 6.4 cm,鉛直方向で 11.3 cm となり C94-M8P で測定した地理座標は正確度も高 いことが確認された。各苗木に個体識別番号を QR コード化したラベルを取り付けることで,自動認識によって遺伝的系統情 報を取得しつつ,同時に地理座標を取得した場合,個体あたりの測定時間は約 13~21 秒となり実際の林木育種の試験地の配置 図作成に活用できると考えられた。 キーワード:マルチ GNSS,後処理キネマティック測位,リアルタイムキネマティック測位,系統管理,自動認識 Koji Matsunaga, *, **, 1 Eitaro Fukatsu, **, 1 Hiroki Irie 2 (2020) Evaluation of Geographical Coordinate Positioning Accuracy for Planted Seedlings with a Simple RTK-GNSS Kit and Its Application for Individual Tree Management in Forest Tree Breeding. J Jpn For Soc 102: 254-262 To obtain the precise geographic coordinates and genetic line information of seedlings planted in the genetic test site for tree breeding, we developed a simple mapping method using an RKT-GNSS kit, C 94-M 8 P application board, and individual seedling labels with a QR code. In the two test sites, we estimated the geographic coordinates of ca. 90 seedlings three times using a C94-M8P GNSS kit with post-processing kinematics analysis and real-time kinematic GNSS. The average standard deviations of replications were 2.6-6.0 cm for horizontal coordinates and 3.6-12.5 cm for vertical coordinates, indicating a high precision of measurements. To evaluate the accuracy of the method, we compared the geographic coordinates estimated using the C94-M8P and geographic coordinates measured as a true value using a dual-frequency GNSS receiver and a Total Station at one test site. The differences of the coordinates were 6. 4 cm and 11.3 cm in horizontal and vertical coordinates, respectively. This suggests that the geographic coordinates estimated by the C94-M8P are very accurate. When we obtained individual identification codes of 90 seedlings from their QR code label using QR code reader and simultaneously obtained the geographical coordinates using the C94-M8P, the time required to obtain a measurement was 13-21 seconds per seedling. These results suggest that the new method is efficient and can be applied to real operations in forest tree breeding.
The trial production of a slope survey equipment that can avoid obstacles and perform inspections equivalent to close-up visual inspections using a camera was carried out. The equipment consists of a main rod connected to the wheels, a pair of motors and propellers, and a flight controller. It is connected to the mooring wire via arms. The equipment is moved up and down by mooring wire. While moored by the wire, it rises by the thrust of the motors and moves left and right to avoid obstacles. Using this equipment, a 3D model was created from the images taken.
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