Ⅳ 3 ドローンを活用した森林調査 - 長野県

1 IV IV IV-70- IV IV- - 1 ICT UAV unmanned aerial vehicle drone 4-61 4-61 4-62 IV IV IV-71- IV 4-62 4-63 4-63 DJI phantom4 RTK IV IV IV-72- IV UAV 2019 2020 DBH DBH DBH 1 1 DBH DBH =a Cab h DBH cm Ca m2 h m a b DBH DBH DBH

2 DBH 1m DBH DBH DBH 051015202530354005101520253035 DBH(cm H(m LogisticDBH . DBH 051015202530354005101520253035 DBH(cm H m Richards . DBH Richards DBH = M (1 - exp(-L H) )k IV IV IV-73- IV 2 NDVI( Normalized Difference Vegetation Index) m NDVI.)))

3 2 NDVI Normalized Difference Vegetation Index NDVI -1 1 NDVI= + NDVI 0 200 = NDVI+ 100 NDVI NDVI IV IV IV-74- IV 500m NDVI 2020 12 4-64 4-64 IV IV IV-75- IV 4-65 4-65 4-66 4-67 NDVI 4-68 4-69 III 39

4 A997A998A976A995A983A977A996A978A999A990 A988A989A993A987A985A984A979A991A980A992 A986A982A981A9942101201020304050B1-2-1B1 -2-2B1-2-3A989A982A980A996A995A997A990A9 87A984A981A986A999A978A992A983A994A985A9 76A979A993A977A998A991A98801020304050B1- 2-1B1-2-2B1-2-301020[ ]( ) 4-66 4-67 SITE4 IV IV IV-76- IV 4-68 DSM 4-69 NDVI NDVI Inspire 3 Double 4K Sentera 2D 3D NDVI Narrow Band RGB Red/Green/Blue Generated with Pix4 Dmapper version NDVI Normalized Difference Vegetation Index IV IV IV-77- IV IV- IV.

5 G:m2/ha Ry Sr H/D 1 (G m2/ha) G DBH 1ha 80 100m2 1ha 80 100m2 734 4cm G G 30 40m2 30 40 m2 4-70 IV IV IV-78- IV 4-70 734 DBH= DBH = 2 Ry Ry Relative yield index Ry 1

6 4-71 4-72 0501001502002500 1010 2020 3030 4040 5050 6060 70 m2/ha (PLot) 0 G 10 4-71 1 /1 /1 7 1 IV IV IV-79- IV /ha 4-72 Ry , 57 4-72 1,000 /ha 20m Ry 1.

7 000 /ha 20m Ry Ry IV IV IV-80- IV ha 470m3 20 ha 580 m3 470m3 580 m3 R 4-16 4-72 ha ha Ry m3 m3 ha ,1982 4-17 4-16 H m N /ha 1,000 V m3/ha HF G m2/ha DG cm VRF m3/ha NRF /ha 2.

8 197 Ry IV IV IV-81- IV 4-17 Ry Ry= 4-17 Ry Ry DBH=38 I II 70 DBH=38 I II DBH=20 IV IV DBH=20 IV IV DBH=20 V V , 3 22 40 152 22 IV IV IV-82- IV 3

9 Sr Sr Relative spacing Sr= 10000ha ( ) (H) 100 4-73 Sr 1ha N 1 Sr=25 Sr=20 2001 Sr=23 Sr=19 22 Sr=19 L H 100 20 15m 3m 20m 4m 2 4-73 Sr=20 Sr 12 Sr 12 L(m H(m IV IV IV-83- IV 4 height diamerter ratio 4-4 H m D cm))

10 H/D 100 50 150 2001 80 60 90 100 90 734 80 90 4-74 4-4 height diamerter raitio height-dbh ratio H/D ,1990, Fr Form ratio Sr) 52 Ry Sr Sr ha Sr Ry