CN106885772A - The ETM remote sensing hydroxyls altered mineral that a kind of geologic knowledge is participated in extracts improved method - Google Patents
The ETM remote sensing hydroxyls altered mineral that a kind of geologic knowledge is participated in extracts improved method Download PDFInfo
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- CN106885772A CN106885772A CN201510930529.8A CN201510930529A CN106885772A CN 106885772 A CN106885772 A CN 106885772A CN 201510930529 A CN201510930529 A CN 201510930529A CN 106885772 A CN106885772 A CN 106885772A
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Abstract
The invention belongs to multispectral remote sensing analysis technical field, and in particular to the ETM remote sensing hydroxyls altered mineral that a kind of geologic knowledge is participated in extracts improved method.Specifically include following steps：Step one, the rotten rock stratum in workspace and water system are digitized；Step 2, determine water system basin scope；Step 3, the hydroxyl exception for extracting workspace ETM data；The mask scope of hydroxyl extraction is not involved in step 4, respectively solution water system basin and in metamorphic rock；Step 5, the mask scope for solving final hydroxyl extraction；Step 6, extraction eliminate the ETM remote sensing hydroxyl altered minerals under running water Rolling Stone and regional metamorphism alteration interference.The present invention eliminates the interference that regional metamorphism and current basin Rolling Stone cause than other traditional remote sensing hydroxyl abnormal extraction methods by introducing geologic knowledge, and the extraction for hydroxyl hydrothermal alteration mineral is more accurate.
Description
Technical field
The invention belongs to multispectral remote sensing analysis technical field, and in particular to the ETM that a kind of geologic knowledge is participated in
Remote sensing hydroxyl altered mineral extracts improved method.
Background technology
The Metasomatic Alteration of rock is mainly the product that different types of hydrothermal solution interacts with original rock.It is most normal
The alteration seen is silication, sericitization, choritization, greisenization, Skarnisation, white clouds lithification, weight
Spar and ferromanganese carbonation.Wall rock alteration is that metallogenic material is progressively left during enrichment of ore-forming
Trace.The mineral deposit of most magma generations is all with the metasomatic alteration phenomenon of its country rock, and alteration zone
Scope more than ore body distribution scope several times to tens times.
It is square in mineral species, structure, color etc. with normal rock with week that wall rock alteration forms altered rock
The difference in face, can cause rock reflexes spectral signature difference, and altered rock is formed in some special spectrum wave bands
Spectral singularity.
Hydroxyl and iron-bearing mineral exception are used as the important mark that two class wall rock alterations are that ore deposit is looked in remote sensing indirectly
In geological prospecting remote sensing exploration, hydroxyl and iron-bearing mineral distribution drawing and geochemical anomalies studying are very for will
It is important.Wall rock alteration can form altered rock spectral singularity in some special spectrum wave bands, and these are peculiar
Spectral characteristic observantly recognized in ETM+ images, for hydroxyl and iron-bearing mineral abnormal information
Extract.
Hydroxyl altered rock is produced by hydroxyl, water or carbonate group, and hydroxyl group absorption bands of a spectrum have 2.2um, 2.3um
At two.There is strong absorption paddy (referred to as hydroxyl bands of a spectrum) near 2.2~2.3um due to OH ions so that ETM
7th wave band of data produces low value, the 5th wave band to produce high level, and hydroxyl mineral are mostly secondary altered mineral,
Such as chlorite, muscovite, kaolinite, sericite, montmorillonite, alunite.
At present, according to conventional remote sensing principal component analytical method (PCA), Multi-spectral Remote Sensing Data is extractable to be contained
The mineral of hydroxyl anion and iron cation, but this with it is desirable that extract the hydrothermal solution close with mineralization relation
Altered mineral still has larger gap.One it is critically important the reason for because remote sensing technique extract hydrothermal alteration with
Some disturbing factors are closely in mineralogical composition.Such as hydrothermal alteration mineral and regional metamorphism product
Mineralogical composition is very close to the hydrothermal alteration mineral of hydroxyl anion mainly include chlorite, muscovite, height
The mineral such as ridge stone, sericite, montmorillonite, alunite, and the mineralogical composition of regional metamorphism metamorphic rock is also main
It is chlorite and muscovite etc..Therefore, traditional multispectral remote sensing mineral extracting method can only be extracted and contain hydroxyl
The mineral of base anion, it is because hydrothermal alteration mineral or regional metamorphism cause that can not distinguish extraction result
's.The result extracted by traditional multispectral remote sensing mineral extracting method, many and hydrothermal alteration hydroxyl ore deposit
Thing is unrelated.Importantly, because regional metamorphism product scale is generally large, its distribution and mineral are pure
Cleanliness is much larger than the distribution of hydrothermal alteration, if not removing the influence of regional metamorphism and running water Rolling Stone
And interference, the less hydrothermal alteration mineral of scale will be difficult to extract.
Disturbed to the information that causes of removal regional metamorphism, then need to introduce geology and into ore deposit knowledge：General area
Chlorite or the scope of muscovite mineral distribution are all larger in the rotten rock stratum that metamorphism is formed, if for the first time
The mineral information that remote sensing technique is extracted has part to be distributed in the range of metamorphic rock, and spread area is more than after cluster
Certain numerical value, then be labeled to the partial results, and the region is covered in second formal extraction
Film, allows the region to be not involved in granular computing, then can effectively remove the shadow that the part is extracted to hydroxyl mineral
Ring.
Therefore, traditional multispectral remote sensing mineral extracting method with it is desirable that extract it is close with mineralization relation
Hydrothermal alteration mineral still have larger gap.How traditional multispectral ore deposit is incorporated into by geology and into ore deposit knowledge
During thing is extracted, so as to reduce regional metamorphism or river course alluviation Rolling Stone to multispectral remote sensing hydroxyl mineral information extraction
The influence of effect, is key problems-solving of the present invention.
The content of the invention
The technical problem to be solved in the present invention is to provide the ETM remote sensing hydroxyl alteration ore deposits that a kind of geologic knowledge is participated in
Thing extract improved method, geologic knowledge is incorporated into conventional method, in advance distinguish and remove regional metamorphism and
The interference effect that river water area is caused, can effectively improve the accuracy of multispectral remote sensing hydroxyl altered mineral extraction,
And be possible to fainter Information extraction out.
In order to solve the above technical problems, the ETM remote sensing hydroxyl altered minerals that a kind of geologic knowledge of the invention is participated in
Extract improved method
(temporarily omitting)
Advantageous Effects of the invention are：The present invention is than other traditional remote sensing hydroxyl anomaly extracting sides
Method, the interference that regional metamorphism and current basin Rolling Stone cause is eliminated by introducing geologic knowledge, for
The extraction of hydroxyl hydrothermal alteration mineral is more accurate.
Intersection as 1) solved water system scope and hydroxyl key element in step 4 in sub-step, obtains buffering area water system
In the range of hydroxyl key element, and the mask scope extracted as next step hydroxyl altered mineral using this result it
One, so as to eliminate the interference that Rolling Stone is extracted to hydroxyl exception mineral in water system basin.
2), 3), 4), 5) sub-step, by series of computation, is solved and is distributed in metamorphic rock model in step 4
In enclosing and the larger hydroxyl abnormal ranges of distribution area, and using this result as next step hydroxyl alteration ore deposit
One of mask scope of thing, so as to reduce regional metamorphism to a certain extent be carried to hydroxyl exception mineral
The interference for taking.
Brief description of the drawings
Fig. 1 is that the ETM remote sensing hydroxyls altered mineral that a kind of geologic knowledge of the invention is participated in extracts improved method
Flow chart.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
The ETM remote sensing hydroxyls altered mineral that a kind of geologic knowledge of the present invention is participated in extracts improved method, specific real
Existing step is as follows：
Step one, the rotten rock stratum in workspace and water system are digitized, the step includes following sub-step
Suddenly：
1.1) according to 1:200000 or 1:50000 electronics geologic maps, to the model on workspace endometamorphism rock stratum to be extracted
Enclose and be digitized, metamorphic rock layer digital scope is set to A (m), wherein m is different zones change after digitlization
Matter rock quantity；
1.2) according to characteristics of remote sensing image, the water system in workspace area is digitized, after digitlization
Water system is set to L (n), and wherein n is water system quantity after digitlization；
Step 2, water system basin scope is determined by buffer zone analysis method, specially：To digitlization water system
As a result L (n) carries out buffer zone analysis, and buffering radius determines according to water system basin scope；Scope after treatment sets
It is B (k), wherein k is workspace internal water system basin quantity after buffer zone analysis, is corresponded with n；
Step 3, the hydroxyl exception that workspace ETM data are tentatively extracted using PCA methods, and tied to extracting
Fruit carries out polygonal meshes treatment, and the step includes following sub-step：
3.1) workspace ETM images are cut, ETM_cut.img files is obtained, to ETM_cut.img
The Isosorbide-5-Nitrae of file, 5,7 wave bands carry out PCA conversion, obtain ETM_cut_PCA.img files；
3.2) standard deviation of the principal component wave band PC4 images of statistical computation ETM_cut_PCA.img files the 4th
σ, calculates 3 times of σ of standard deviation 3；
3.3) high-end cutting is carried out to PC4 images with 3 σ values, obtains hydroxyl mineral vector element OH (j),
Wherein j is hydroxyl mineral key element number；
3.4) polygonal meshes treatment is carried out to hydroxyl mineral vector element OH (j), obtains workspace hydroxyl
Mineral scope OH (i), wherein i are the number of the hydroxyl polygon key element after polygonal meshes；
The mask scope of hydroxyl extraction is not involved in step 4, respectively solution water system basin and in metamorphic rock, should
Step includes following sub-step：
4.1) OH (i) and B (k) carry out intersecting treatment, that is, solve the hydroxyl key element in the range of buffering area water system
OH1 (h), wherein h are hydroxyl key element quantity in the range of water system：
OH1 (h)=OH (i) ∩ B (k)；
4.2) each key element OH (i) is in workspace strata of metamorphic rocks scope A (m) after solving hydroxyl mineral cluster
Hydroxyl mineral are distributed, and represent that p is the quantity of the hydroxyl key element in strata of metamorphic rocks with OH2 (p)：
OH2 (p)=OH (i) ∩ A (m)；
4.3) area of OH2 (p) each key element is solved, OH2 (p) .Area are designated as
4.4) area is more than 2000m in calculating OH2 (p)2Hydroxyl key element, that is, solve in the rotten rock stratum in workspace
Area is more than 2000km2Hydroxyl key element, be designated as OH2 (q), q is that the rotten rock stratum inner area in workspace is more than
2000km2Hydroxyl key element number；
OH2 (q)=OH2 (p) .Area>2000m2；
Step 5, the mask scope for solving final hydroxyl extraction, that is, solve the union of OH1 (h) and OH2 (q)
OHmask (y), wherein y are the key element quantity of hydroxyl masked areas：
OHmask (y)=OH1 (h) ∪ OH2 (q)
Solve in being distributed in metamorphic rock scope, area is more than 2000km2, and the hydroxyl in water system basin
Used as masked areas, the region is not involved in final hydroxyl mineral and extracts in region；
Step 6, extraction eliminate the ETM remote sensing hydroxyls under running water Rolling Stone and regional metamorphism alteration interference
Altered mineral, specifically includes：
6.1) binaryzation rastering operation is carried out as region of interest to result OHmask (y) that step 5 is calculated, is built
Vertical binaryzation mask file OHmask.GIF；
6.2) using OHmask.GIF as mask image, to the Isosorbide-5-Nitrae of ETM_cut.img files, 5,7 wave bands
PCA conversion is carried out, ETM_cut_mask_PCA.img files are obtained；
6.3) the principal component wave band PC_mask4 images of statistical computation ETM_cut_mask_PCA.img files the 4th
Standard deviation σ；
6.4) high-end cutting is carried out to PC_mask4 images with the value of σ, 2* σ, 3* σ respectively, respectively
To primary OH mineral vector file OH_mask1, secondary hydroxyl groups mineral vector file OH_mask2 and three-level hydroxyl
Base mineral vector file OH_mask3.
Claims (8)
1. the ETM remote sensing hydroxyls altered mineral that a kind of geologic knowledge is participated in extracts improved method, and its feature exists
In.Specifically include following steps：
Step one, the rotten rock stratum in workspace and water system are digitized, obtained in workspace to be extracted,
Water system after metamorphic rock layer digital scope and digitlization；
Step 2, determine water system basin scope；
Step 3, the hydroxyl exception for extracting workspace ETM data, and carry out polygonal meshes to extracting result
Treatment；
The mask scope of hydroxyl extraction is not involved in step 4, respectively solution water system basin and in metamorphic rock；
Step 5, the mask scope for solving final hydroxyl extraction；
Step 6, extraction eliminate the ETM remote sensing hydroxyls under running water Rolling Stone and regional metamorphism alteration interference
Altered mineral.
2. the ETM remote sensing hydroxyl altered minerals that a kind of geologic knowledge according to claim 1 is participated in are carried
Take improved method, it is characterised in that：In described step one, the step includes following sub-step：
1.1) according to electronics geologic map, the scope to workspace endometamorphism rock stratum to be extracted is digitized,
Metamorphic rock layer digital scope is set to A (m), and wherein m is different zones metamorphic rock quantity after digitlization；
1.2) according to characteristics of remote sensing image, the water system in workspace area is digitized, after digitlization
Water system is set to L (n), and wherein n is water system quantity after digitlization.
3. the ETM remote sensing hydroxyl altered minerals that a kind of geologic knowledge according to claim 2 is participated in are carried
Take improved method, it is characterised in that：In the step 2, water system basin is determined by buffer zone analysis method
Scope, specially：Buffer zone analysis are carried out to digitlization water system result L (n), buffering radius is according to water system stream
Domain scope determines；Scope after treatment is set to B (k), and wherein k is workspace internal water system stream after buffer zone analysis
Domain quantity, corresponds with n.
4. the ETM remote sensing hydroxyl altered minerals that a kind of geologic knowledge according to claim 3 is participated in are carried
Take improved method, it is characterised in that：In the step 3, the step includes following sub-step：
3.1) workspace ETM images are cut, ETM_cut.img files is obtained, to ETM_cut.img
The Isosorbide-5-Nitrae of file, 5,7 wave bands carry out PCA conversion, obtain ETM_cut_PCA.img files；
3.2) standard deviation of the principal component wave band PC4 images of statistical computation ETM_cut_PCA.img files the 4th
σ, calculates 3 times of σ of standard deviation 3；
3.3) high-end cutting is carried out to PC4 images with 3 σ values, obtains hydroxyl mineral vector element OH (j),
Wherein j is hydroxyl mineral key element number；
3.4) polygonal meshes treatment is carried out to hydroxyl mineral vector element OH (j), obtains workspace hydroxyl
Mineral scope OH (i), wherein i are the number of the hydroxyl polygon key element after polygonal meshes.
5. the ETM remote sensing hydroxyl altered minerals that a kind of geologic knowledge according to claim 4 is participated in are carried
Take improved method, it is characterised in that：In described step four, the step includes following sub-step：
4.1) OH (i) and B (k) carry out intersecting treatment, that is, solve the hydroxyl key element in the range of buffering area water system
OH1 (h), wherein h are hydroxyl key element quantity in the range of water system：
OH1 (h)=OH (i) ∩ B (k)；
4.2) each key element OH (i) is in workspace strata of metamorphic rocks scope A (m) after solving hydroxyl mineral cluster
Hydroxyl mineral are distributed, and represent that p is the quantity of the hydroxyl key element in strata of metamorphic rocks with OH2 (p)：
OH2 (p)=OH (i) ∩ A (m)；
4.3) area of OH2 (p) each key element is solved, OH2 (p) .Area are designated as；
4.4) hydroxyl key element of the area more than AREA in OH2 (p) is calculated, that is, solves the rotten rock stratum inner face in workspace
Hydroxyl key element of the product more than AREA, is designated as OH2 (q), and q is that the rotten rock stratum inner area in workspace is more than AREA
Hydroxyl key element number.
6. the ETM remote sensing hydroxyl altered minerals that a kind of geologic knowledge according to claim 5 is participated in are carried
Take improved method, it is characterised in that：In the step 5, the mask scope that final hydroxyl is extracted is solved, i.e.,
Union OHmask (y) of OH1 (h) and OH2 (q) is solved, wherein y is the key element quantity of hydroxyl masked areas：
OHmask (y)=OH1 (h) ∪ OH2 (q).
7. the ETM remote sensing hydroxyl altered minerals that a kind of geologic knowledge according to claim 6 is participated in are carried
Take improved method, it is characterised in that：In the step 6, following sub-step is specifically included：
6.1) binaryzation rastering operation is carried out as region of interest to result OHmask (y) that step 5 is calculated, is built
Vertical binaryzation mask file OHmask.GIF；
6.2) using OHmask.GIF as mask image, to the Isosorbide-5-Nitrae of ETM_cut.img files, 5,7 wave bands
PCA conversion is carried out, ETM_cut_mask_PCA.img files are obtained；
6.3) the principal component wave band PC_mask4 images of statistical computation ETM_cut_mask_PCA.img files the 4th
Standard deviation σ；
6.4) high-end cutting is carried out to PC_mask4 images with the value of σ, 2* σ, 3* σ respectively, respectively
To primary OH mineral vector file OH_mask1, secondary hydroxyl groups mineral vector file OH_mask2 and three-level hydroxyl
Base mineral vector file OH_mask3.
8. the ETM remote sensing hydroxyl altered minerals that a kind of geologic knowledge according to claim 7 is participated in are carried
Take improved method, it is characterised in that：AREA is 2000m2。
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