Pi-SAR-L2 多偏波画像による土地被覆に関する基礎的検討

(一社)日本リモートセンシング学会第57回学術講演会論文集 2014年11月
Pi-SAR-L2 ከ೫Ἴ⏬ീ࡟ࡼࡿᅵᆅ⿕そ࡟㛵ࡍࡿᇶ♏ⓗ᳨ウ
A8
Fundamental study on land-cover using multi-polarized Pi-SAR-L2 data
‫ۑ‬బ↓⏣ኟᕼ 1࣭ࣜࣗ࢘ ࢙࢘ࣥ 2࣭ᒣᓮᩥ㞝 2
Natsuki Samuta㸪Wen Liu㸪Fumio Yamazaki
Abstract : Using multi-polarized Pi-SAR-L2 data by JAXA , a fundamental study on backscatter from different land-covers in
Natori, and Iwanuma cities , Miyagi prefecture, was investigated . A Pi-SAR-L2 image was compared with field survey pictures
by the authors and an aerial photograph by Google Earth. From the color composite image of HH, HV, and VV polarizations,
different backscattering characteristics are observed. Flat areas such as runways and grounds show small backscatter for all the 3
polarizations, trees show strong backscatter for the VV component, and manmade objects show strong HH and VV backscatter.
Keywords : Pi-SAR-L2 , multi-polarization, L-band, land-cover.
1. ࡣࡌࡵ࡟
ྜᡂ㛤ཱྀ࣮ࣞࢲ(SAR)࡟࠾ࡅࡿ L-band ࡣ㸪Ἴ㛗ࡀ
㛗࠸ࡓࡵ࡟᳜⏕ࢆ㏱㐣ࡍࡿ࡞࡝ࡢ฼Ⅼࢆ᭷ࡍࡿࡀ㸪
X-band ࡟ẚ࡭ࡿ࡜⏬ീࡢゎീᗘࡀప࠿ࡗࡓ㸬ࡋ࠿ࡋ
㏆ᖺゎീᗘࡢ㧗࠸ L-band ࢆࡶࡘ⾨࣭ᫍ⯟✵ᶵ SAR
ࡀⓏሙࡋ࡚࠸ࡿ㸬Pi-SAR-L2 ࡣ㸪2011 ᖺࡲ࡛㐠⏝ࡉ
ࢀ࡚࠸ࡓ Pi-SAR-L ࡢᨵⰋ∧࡛࠶ࡾ㸪ศゎ⬟ࡸឤᗘ
ࡀ ALOS-2 ⾨ᫍ࡟ᑐᛂࡋࡓࡶࡢ࡟ᘬࡁୖࡆࡽࢀ࡚࠸
ࡿ㸬ᆅୖศゎ⬟ 85MHz㸪ࢫࣛࣥࢺࣞࣥࢪศゎ⬟
1.76m㸪࢔ࢪ࣐ࢫࣞࣥࢪศゎ⬟ 3.2m ࡜㸪㹊-band ࡜
ࡋ࡚ࡣࡁࢃࡵ࡚㧗࠸ศゎ⬟ࢆࡶࡘ㸬ࡉࡽ࡟㸪Ỉᖹ࣭
ᆶ┤೫Ἴࡢ⤌ࡳྜࢃࡏࢆ⏝࠸࡚ 4 ೫Ἴࡢ⏬ീࢆྲྀᚓ
࡛ࡁࡿ࣏࣓ࣛࣜࢺࣜᶵ⬟ࢆ᭷ࡋ࡚࠸ࡿ 1) 㸬
ᮏ◊✲࡛ࡣ㸪௝ྎᕷ࿘㎶ࢆ 2014 ᖺ 6 ᭶ 12 ᪥࡟᧜
ᙳࡋࡓ Pi-SAR-L2 ࡢከ೫Ἴ⏬ീࢆ⏝࠸࡚㸪⌧ᆅㄪᰝ
࡜ගᏛࢭࣥࢧ⏬ീࢆẚ㍑ࡋ㸪ᅵᆅ⿕そ࡟㛵ࡍࡿᇶ♏
ⓗ᳨ウࢆ⾜࠺ 2)㸬
3. ከ೫Ἴ SAR ⏬ീ࡟ࡼࡿᅵᆅ⿕そࡢ᳨ウ
ࡲࡎ Pi-SAR-L2 ࡢ HH ೫Ἴ࡟㉥㸪HV ೫Ἴ࡟⥳㸪
VV ೫Ἴ࡟㟷ࢆ୚࠼ࡓ࣮࢝ࣛྜᡂᅗࢆసᡂࡋ㸪Fig.
2(a)࡟♧ࡍ㸬Fig. 2(b) ࡟♧ࡍ 2014 ᖺ 3 ᭶ 24 ᪥࡟᧜
ᙳࡉࢀࡓ Google Earth ࡢගᏛ⏬ീ࡜ẚ㍑ࡋࡓ㸬
2. ᑐ㇟ᆅᇦ࡜౑⏝⏬ീ
ᐑᇛ┴ྡྲྀᕷ㸪ᒾ἟ᕷἢᓊ㒊ࢆᑐ㇟ᆅᇦ࡟タᐃࡋ
ࡓ(Fig.1)㸬ࡇࡢᆅᇦ࡟ࡣ௝ྎ✵ ࡀᡤᅾࡋ࡚࠸ࡿ࡯
࠿㸪2011 ᖺ 3 ᭶ 11 ᪥࡟Ⓨ⏕ࡋࡓᮾ᪥ᮏ኱㟈⅏ࡢ㟈
⅏᚟⯆࡜ࡋ࡚㸪ࠕ༓ᖺᕼᮃࡢୣࠖ࡜࿧ࡤࢀࡿ⥳ࡢ㜵
₻ሐ࠾ࡼࡧ㑊㞴ᡤ࡜࡞ࡿୣࡀἢᓊ㒊࡟ᘓタࡉࢀ࡚
࠸ࡿ㸬ࢹ࣮ࢱࡣ 2014 ᖺ 6 ᭶ 12 ᪥ 12:38:35 ࠿ࡽ
12:46:54 ࡟࠿ࡅ࡚ JAXA ࡀ᧜ᙳࡋࡓ Pi-SAR -L2 ࢹ࣮
ࢱࢆ౑⏝ࡍࡿ㸬㌶㐨ࡣୖ᪼㌶㐨࡛㸪඲ 4 ೫Ἴࢆྲྀᚓ
ࡋ࡚࠸ࡿ㸬ᮏ◊✲࡛ࡣࡇࡢ࠺ࡕ㸪HH㸪HV㸪VV ࡢ
3 ೫Ἴࢆ⏝࠸ࡓ㸬⏬ീࡣᆅᅗᢞᙳࡉࢀࡓᙉᗘ⏬ീ࡛
࠶ࡿ㸬㍤ᗘ⿵ṇ࡟ࡼࡾ㸪ࢹࢪࢱ್ࣝ(DN)ࢆᚋ᪉ᩓ஘
᩿㠃✚(ı0)࡟ኚ᥮ࡍࡿ㸬ኚ᥮ᘧࡣ JAXA ࡀ♧ࡋࡓᘧ
(1)ࢆ⏝࠸ࡓ㸬࡞࠾ᰯṇಀᩘ(CF)ࡣ㸫81 ੴ࡛࠶ࡿ㸬
(a)
(b)
Fig.2 Color composite of multi-polarized Pi-SAR-2
image taken on June 12, 2014 (a) and optical image
taken on March 24, 2014 from Google Earth (b).
V
1
0
10࣭log10 ¢ DN ² CF
2
Ꮫ⏕఍ဨ ༓ⴥ኱Ꮫ ᕤᏛ㒊㒔ᕷ⎔ቃࢩࢫࢸ࣒Ꮫ⛉
(ᡤᅾᆅ ࠛ263-8522 ༓ⴥ┴༓ⴥᕷ✄ẟ༊ᘺ⏕⏫1-33)
(㐃⤡ඛ Tel:043-290-3528 E-mail:[email protected])
2
ṇ఍ဨ ༓ⴥ኱Ꮫ኱Ꮫ㝔 ᕤᏛ◊✲⛉ ᘓ⠏࣭㒔ᕷ⛉Ꮫᑓᨷ
(1)
Fig.1 Imaging area of Pi-SAR-L2 and the location
of the study area in Natori and Iwanuma City
ᕷ⾤ᆅࡣ 3 ೫Ἴࢆ඲࡚ᙉࡃ཯ᑕࡍࡿࡓࡵⓑࡃ㸪⏣
⏿ࡣࡇࢀࡽࢆ࡯࡜ࢇ࡝཯ᑕࡏࡎ㯮ࡃ࡞ࡗ࡚࠸ࡿ㸬㟷
ࡃ♧ࡉࢀࡓ VV ೫Ἴࡢ཯ᑕࡀ࡜ࡃ࡟ᙉ࠸㒊ศ࡟ࡣ㸪
࣓࢞ࢯ࣮࣮ࣛࡀᘓタࡉࢀ࡚࠸ࡿ㸬࣓࢞ࢯ࣮࣮ࣛࡀ
VV ೫Ἴࢆᙉࡃ཯ᑕࡍࡿࡇ࡜ࡣ㸪ྡྲྀᕷෆ㝣㒊࡟࠶
ࡿ࣓࢞ࢯ࣮࣮ࣛࢆ᧜ᙳࡋࡓከ೫Ἴ⏬ീ࠿ࡽࡶぢ࡚
̶ 21 ̶
࡜ࢀࡿ(Fig.3)㸬
ࡲࡓ㸪Pi-SAR-L2 ࡢ⏬ീࢆ᳨ウࡍࡿ࡟࠶ࡓࡗ࡚
SAR ⏬ീࡢ᧜ᙳ࡟ྜࢃࡏ࡚㸪2014 ᖺ 6 ᭶ 12 ᪥࡟⌧
ᆅㄪᰝࢆ⾜ࡗࡓ(Fig.4)㸬᧜ᙳ᫬㛫ࡣ༗๓୰࡛㸪ኳẼ
ࡣ⏕៮㞵࡛࠶ࡗࡓ㸬
㌴㐨ࡢ⾤㊰ᶞࢆྵࡵᶞᮌࡀከࡃぢࡽࢀࡿᆅⅬ a㸪d
௜㏆ࡣ⥳Ⰽ࡟࡞ࡗ࡚࠾ࡾ㸪HV ೫Ἴࢆᙉࡃ཯ᑕࡋ࡚
࠸ࡿࡇ࡜ࡀࢃ࠿ࡿ㸬ᆅⅬ b㸪c ࡟ࡣ㸪ࡑࢀࡒࢀ௝ྎ
✵ ࡢ⁥㉮㊰࡜㥔㌴ሙࡀ఩⨨ࡋ࡚࠸ࡿ㸬⁥㉮㊰ࡣ㯮
࠸ࡇ࡜࠿ࡽ 3 ೫Ἴ࡜ࡶ࡯࡜ࢇ࡝཯ᑕࡋ࡚࠸࡞࠸ࡇ࡜
ࡀぢ࡚࡜ࢀࡿ㸬ࡇࢀࡣ㞀ᐖ≀ࡀ࡯࡜ࢇ࡝࡞࠸ᖹࡽ࡞
ᆅ㠃ࡢࡓࡵ㸪࣐࢖ࢡࣟἼࡀ㙾㠃཯ᑕࡋࡓ⤖ᯝ࡛࠶ࡿ
ࡇ࡜ࡀ⪃࠼ࡽࢀࡿ㸬୍᪉㸪㥔㌴ሙࡣⓑ࡜⥳࡛࠶ࡿࡇ
࡜࠿ࡽ 3 ೫Ἴ࡜ࡶ཯ᑕࡋ࡚࠸ࡿࡀ㸪୰࡛ࡶ HV ೫Ἴ
ࢆᙉࡃ཯ᑕࡋ࡚࠸ࡿࡇ࡜ࡀࢃ࠿ࡿ㸬ࡇࢀࡣ㥔㌴㌴୧
࡟ࡼࡿᚋ᪉ᩓ஘ࡀᙉ࠸ࡇ࡜ࡀ⌮⏤࡜⪃࠼ࡽࢀࡿ㸬༓
ᖺᕼᮃࡢୣࡀ఩⨨ࡍࡿⅬ e ࡜ f ࡟ࡘ࠸࡚ࡣ㸪㹄ig.5
࡟ᣑ኱ࡋ࡚♧ࡍ㸬
ᆅⅬ e ࡣᘓタ୰ࡢ㜵₻ሐࡀᏑᅾࡋ㸪
⤌ࡲࢀࡓ㦵ᮦࡀ⥺ୖ࡟ HH ೫Ἴ࡜ VV ೫Ἴࢆᙉࡃ཯
ᑕࡋ࡚࠸ࡿ㸬ࡇࡢࡇ࡜࠿ࡽ㸪ࡇࡢࡼ࠺࡞ᙧ≧࡜⾲㠃
ᛶ≧ࡢேᕤ≀ࡣ㸪HH ೫Ἴ࡜ VV ೫Ἴࡢ཯ᑕࡀᙉ࠸
࡜⪃࠼ࡽࢀࡿ㸬ᆅⅬ f ࡣ༓ᖺᕼᮃࡢୣࡢୣ㒊ศ࡛࠶
ࡾ㸪㡬ୖ࡜㐨ࡣⓑ࠸ࡇ࡜࠿ࡽ඲೫Ἴࢆ཯ᑕࡋ㸪⾲㠃
ࡢⰪ࡟࡞ࡗ࡚࠸ࡿ㒊ศࡣ඲೫Ἴ࡟ࡘ࠸࡚཯ᑕࡀᙅ
࠸ࡇ࡜ࡀࢃ࠿ࡿ㸬ᶞᮌ࡜␗࡞ࡾⰪࡢ཯ᑕࡀᙅ࠸ࡢࡣ㸪
య✚ᩓ஘ࡀᑠࡉࡃ㸪ࡲࡓ⾲㠃ࡀ⁥ࡽ࠿࡛࠶ࡿࡓࡵ㙾
㠃཯ᑕࡍࡿ࠿ࡽ࡜⪃࠼ࡽࢀࡿ㸬
ཧ⪃ᩥ⊩
1)JAXA Web ࣮࣌ࢪ㸸URL:http://www.eorc.jaxa.jp/ALOS/
Pi-SAR-L2/about_pisar.html
2)㔝୰⚅ᚿ㸪➲ᕝṇ㸪ᾆሯΎᓠ㸪ᱵཎಇᙪ㸪బ➉ㄔ㸪ℿ
஭❶Ⴙ㸪ᯇᒸᘓᚿ㸪୰ᮧ࿴ᶞ㸪Ᏺᒣᩄᩥ㸸⯟✵ᶵᦚ㍕
ྜᡂ㛤ཱྀ࣮ࣞࢲ(Pi-SAR)ࡢከ࿘Ἴ/ከ೫Ἴࢹ࣮ࢱࢆ฼⏝
ࡋࡓᆅ≀ุㄞ㸪ඛ➃ 㔞ᢏ⾡ No.93㸪᪥ᮏ 㔞ㄪᰝᢏ⾡
༠఍㸪pp17-27㸪2007.1
(a)
(b)
(c)
Fig.3 Location of solar panels in Natori City (a);
comparison of a close-up optical image (b) and
Pi-SAR-L2 color composite image (c).
4㸬ࡲ࡜ࡵ
Pi-SAR-L2 ࡢከ೫Ἴ⏬ീࢆ⏝࠸࡚ᐑᇛ┴ྡྲྀᕷ࡜
ᒾ἟ᕷࡢἢᓊ㒊ࢆᑐ㇟࡟ᅵᆅ⿕そࡢ᳨ウࢆ⾜ࡗࡓ㸬
᳨ウࡍࡿ࡟࠶ࡓࡗ࡚㸪SAR ほ ᪥࡟ྜࢃࡏࡓ⌧ᆅㄪ
ᰝࡶ⾜࠸㸪Google Earth ࡢගᏛ⏬ീࡶཧ⪃࡟㸪ᚓࡽ
ࢀࡓ 3 ೫Ἴࡢ࣮࢝ࣛྜᡂᅗ࡜ẚ㍑ࡋࡓ㸬ࡑࡢ⤖ᯝ㸪
ᕷ⾤ᆅࡣ 3 ೫Ἴ඲࡚ࢆᙉࡃ཯ᑕࡋ㸪ᘓタᮦࡢࡼ࠺࡞
ேᕤ≀ࡣ HH ೫Ἴ࡜ VV ೫Ἴࢆ㸪࣓࢞ࢯ࣮࣮ࣛࡣ
Fig.4 Field survey points (left) on the color composite
VV ೫Ἴࢆᙉࡃ཯ᑕࡍࡿᵝᏊࡀほ ࡉࢀࡓ㸬ࡲࡓ㸪 Pi-SAR-L2 image and ground photos of points a to d
⁥㉮㊰ࡸ⏣⏿㸪Ⱚࡢࡼ࠺࡞พฝࡀᑡ࡞࠸ᖹࡽ࡞ሙᡤ (right).
ࡣ࡯࡜ࢇ࡝཯ᑕࡋ࡞࠸ࡇ࡜ࡀࢃ࠿ࡗࡓ㸬
࡞࠾㸪௒ᅇࡣ 2 㒔ᕷࡢἢᓊ㒊ࡢᩘᆅⅬ࡟㛵ࡋ࡚ࡢ
ࡳ᳨ウࢆ⾜ࡗࡓࡀ㸪࣐࢖ࢡࣟἼࡢ↷ᑕゅᗘ࡜ᑐ㇟≀
ࡢྥࡁ࡟ࡼࡗ࡚ᚋ᪉ᩓ஘ࡢ௙᪉ࡀ␗࡞ࡿࡓࡵ㸪ᚲࡎ
ࡋࡶ୍⯡ᛶࡣ࡞࠸㸬௒ᚋࡶࡉࡽ࡟㸪ヲ⣽࡞ㄪᰝ࡜᳨
ウࢆ⾜ࡗ࡚࠸ࡁࡓ࠸࡜⪃࠼࡚࠸ࡿ㸬
ㅰ㎡
Pi-SAR-L2 ࢹ࣮ࢱࡣ㸪JAXA ࡜༓ⴥ኱Ꮫࡢඹྠ◊
✲㸦Pi-SAR-L2 ࢹ࣮ࢱࢆ⏝࠸ࡓᕷ⾤ᆅࡢࣔࢹࣝ໬࡜
⮬↛⅏ᐖࡢᢕᥱ㸸ᒣᓮᩥ㞝௦⾲㸧࡜ࡋ࡚㈚୚ࡉࢀࡓ
ࡶࡢ࡛࠶ࡿ㸬グࡋ࡚ㅰ㎡ࢆ⾲ࡋࡲࡍ㸬
Fig.5 Close-up image of Fig.4 encircled by the yellow
line (left) and ground photos of point e and f (right).
̶ 22 ̶

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