The early concept of remote sensing of SSS has been demonstrated in the late 1970s with observations by Skylab [7] and two airborne L-band radiometry experiments [8,9].
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	3:det	Discourse=context-background:25->7:5|Entity=(47-abstract-new-cf2-3-sgl
2	early	early	ADJ	JJ	Degree=Pos	3	amod	3:amod	_
3	concept	concept	NOUN	NN	Number=Sing	11	nsubj:pass	11:nsubj:pass	_
4	of	of	ADP	IN	_	6	case	6:case	_
5	remote	remote	ADJ	JJ	Degree=Pos	6	amod	6:amod	Entity=(48-abstract-new-cf5-2-coref
6	sensing	sensing	NOUN	NN	Number=Sing	3	nmod	3:nmod:of	_
7	of	of	ADP	IN	_	8	case	8:case	_
8	SSS	SSS	NOUN	NN	Number=Sing	6	nmod	6:nmod:of	Entity=(39-abstract-giv:act-cf1*-1-coref)48)47)|XML=<hi rend:::"italic"></hi>
9	has	have	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	11	aux	11:aux	_
10	been	be	AUX	VBN	Tense=Past|VerbForm=Part	11	aux:pass	11:aux:pass	_
11	demonstrated	demonstrate	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	0:root	_
12	in	in	ADP	IN	_	15	case	15:case	_
13	the	the	DET	DT	Definite=Def|PronType=Art	15	det	15:det	Entity=(49-time-new-cf3-3-sgl|XML=<date notBefore:::"1976" notAfter:::"1979">
14	late	late	ADJ	JJ	Degree=Pos	15	amod	15:amod	_
15	1970s	1970s	NOUN	NNS	Number=Plur	11	obl	11:obl:in	Entity=49)|XML=</date>
16	with	with	ADP	IN	_	17	case	17:case	_
17	observations	observation	NOUN	NNS	Number=Plur	11	obl	11:obl:with	Entity=(50-abstract-new-cf6-1-sgl
18	by	by	ADP	IN	_	19	case	19:case	_
19	Skylab	Skylab	PROPN	NNP	Number=Sing	17	nmod	17:nmod:by	Entity=(51-object-new-cf4-1-sgl-Skylab)50)
20	[	[	PUNCT	-LRB-	_	21	punct	21:punct	Discourse=explanation-evidence:26->25:0|SpaceAfter=No
21	7	7	NUM	CD	NumForm=Digit|NumType=Card	17	dep	17:dep	Entity=(52-abstract-new-cf8-1-sgl)|SpaceAfter=No|XML=<ref></ref>
22	]	]	PUNCT	-RRB-	_	21	punct	21:punct	_
23	and	and	CCONJ	CC	_	30	cc	30:cc	Discourse=joint-list_m:27->25:1
24	two	two	NUM	CD	NumForm=Word|NumType=Card	30	nummod	30:nummod	Entity=(53-abstract-new-cf7-7-sgl
25	airborne	airborne	ADJ	JJ	Degree=Pos	30	amod	30:amod	_
26	L	L	PROPN	NNP	Number=Sing	28	compound	28:compound	Entity=(54-abstract-new-cf11-4-sgl(55-abstract-new-cf12-3-coref-L_band|SpaceAfter=No|XML=<w>
27	-	-	PUNCT	:	_	26	punct	26:punct	SpaceAfter=No
28	band	band	NOUN	NN	Number=Sing	29	compound	29:compound	Entity=55)|XML=</w>
29	radiometry	radiometry	NOUN	NN	Number=Sing	30	compound	30:compound	Entity=54)
30	experiments	experiment	NOUN	NNS	Number=Plur	17	conj	11:obl:with|17:conj:and	Entity=53)
31	[	[	PUNCT	-LRB-	_	32	punct	32:punct	Discourse=explanation-evidence:28->27:0|SpaceAfter=No|XML=<w>
32	8	8	NUM	CD	NumForm=Digit|NumType=Card	30	dep	30:dep	Entity=(56-abstract-new-cf9-1-sgl)|SpaceAfter=No
33	,	,	PUNCT	,	_	34	punct	34:punct	SpaceAfter=No
34	9	9	NUM	CD	NumForm=Digit|NumType=Card	32	conj	30:dep|32:conj	Entity=(57-abstract-new-cf10-1-sgl)|SpaceAfter=No|XML=<ref></ref>
35	]	]	PUNCT	-RRB-	_	32	punct	32:punct	SpaceAfter=No|XML=</w>
36	.	.	PUNCT	.	_	11	punct	11:punct	_
